APSC Chemical Examiner (Excise) Assam 2024: Chemical Examiner (Excise) Assam (Advt. 27/2023), Chemistry & Sophisticated Instruments
Text of page 1
CHEX/CHSOINltl24
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE ASKED TO DO SO
Test Booklet No. : Series
00053 TEST BOOKLET
Paper-I
CHEMISTRY AND SOPHISTICATED
INSTRUMENTS I
TimeAlloved:2Hours Full Marks : IOO
Rcdd the fouotlng l^rttucfions cqrcfraug befor? gou bcgl^ to q su,et lrl. quastlons i
1. The name of the Subject, RolI Number as mentioned in tl.e Admission Certilicate, Test Booklet No. a.rid Series
are to be wdtten legibly afld correctly in thc space provided on the Answer-Shcet with Black/Blue ballpoint p.n.
2. AlslrGr-ghcat rrlthout aathllrg Sotlat .r a€atloaGd .bovG t! th! .p.c. provldod for ln th. An.E r.tlh!.t
shall not b6 Gvaluatod.
g. All questions carry equel marks.
Tha AarwaFshact lhodd bc lubmlttGd to thc laylgllrtor.
Di"redior,s for giving the @nsrrers i Directions fo! answenng questions have already been issued to the respective
candidates iII the 'Instructions for marking in the OMR Answer-Sheet'along with t}te Admit Card and Specimen
Copy of the OMR Answer-Sheet.
Example :
Suppose the following question is asked :
The eapital of Bangladesh is
(4 Chennai
(B) London
(c) Dhaka
(D) Dhubri
You will have four alternatives in the Answer-Sheet for youi response corresponding to each question of the
Test Booklet as below :
@@oo
tn the above illustiation, ifyour chosen response is altemative (C), i.e., Dhaka, then the same should be marked
on the Ansv/er-Sheet by blackening the relevant circle with a Black/Blue ballpoint pen orfy as below :
@@ao
Th6 otample show[ above ls the oDly corrcct mcthoal of alswedng.
4. Use of eraser, blade, chemical whitener fluid to rectify any response is prohibited.
5. Please ensure that the Test Booklet has the required number ofpages (20) and 1oo questions immediately aiter
opening the Booklet. In case of a.ny discrepancy, please report the same to the Invigilator.
6, No candidate shall be admitted to the Examination Hall/Room 20 minutes after the commencement of the
exarnination.
7. No candidate shall leave the Examination Ha.ll/Room llrithout prior permission ofthe Superviso!/lnvigilator. No
candidate shall be permitted to hand over his/her Answer-Sheet and leave the Examination Hall/Room before
expiry of the tulI time a.llotted for each paper.
8. No Mobile Phone, Electronic Communication Device, etc., are allowed to be carried inside tle Examination
HaI/Room by the candidates. Any Mobile Phone, Electronic Communication Device, etc., found in possession
of the csndidate inside the Examlnation Hall/Room, even if on ofi mode, shsll be liable for conliscation,
9. No candidate shall have in his/her possession inside the Examination Hsll/Room any book, notebook or loose
pape., except his/her Admission Certificate and other connected papels permitted by the Commission.
lO. Complete silence must be observed in the Examination Hall/Room. No candidate shall copy from the paper of
any other candidate, or permit his/her own paper to be copied, or give, o! attempt to give, or obtatr, or attempt
to obtain iregula:r assistance of any kind.
11. This Test Booklet carl be carried with you after answering the questions in tie prescribed Answer-Sheet.
12. Noncompliance with any of tlle above instructions wil! render a caldidate liable to penalty as may be deemed
fit.
13. No rough work is to be done on the OMR Answer-Sheet. You ca]rl do the rough work on the space provided in the
Test Booklet.
N.B. i Thcre wlu bc negatlvc trar<rg @ O-25 l,cr 1 (oael aark agalrrst each wrorrg aaawef.
ME I No. of Questions : 1oo ]
Text of page 2
1. Nyion 66 is prepared by the In the most stable conformer of
condensation polymerization of 1,3-dimethylcyclohexane, the methyl
groups at C1 and C3 are
(A) stfene and 1,3-butadiene (A) axial and equatorial respectively
(B) equatorial and equatorial
(B) ethylene glycol and terephthalic respectively
acid
(C) equatorial and axial respectively
(C) ethene and propene (D) axial and axial respectively
(D) hexamethylenediamine The conliguration at C-2 and C-3 of
the molecule
adipic acid
cooH
It
H-C--.oH
t,
H-C-OH
The major product formed in the l3
reaction of isoprene with ethyl cooH
4
acrylate is TS
(A) 2R,35
(A)
A--/ COOET (B) 2R, 3R
)-) (c) 25,3R
25,35
g
(D)
COOET
5. Among the following dienes, which
(B)
one will undergo a degenerate Cope
rearrangement?
COOET \j:-/
(B) I )
-{,,\
(C) <\Z
COOET
(Dl
')'.<,2
CHEX/CHSOIN/I / 24 I 52.A 2
Text of page 3
6. Which of the following compounds 8. The polymer Bakelite' is prepared by
is the strongest base? the reaction of
(A) melamine and formaldehyde
(A) (B) phenol and formaldehyde
\rrrl (C) urea and phenol
^
(D) ethylene glycol and phthalic
(B) acid
An organic compound X has
molecular formula C5HsO2. The
compound can be reduced to
(c)
(,-, n-pentane by reduetion with
Zrt-Hg/HCl. The compound reacts
H with hydrorylamine to grve a
dioxime. The compound also gives
positive iodoform test. The structure
NHz
(D)
er of the compound X is
(A) ")a-a'
7, Consider the followlng sequence of
reactions :
(') )r)a
cooH (c) -.\-,'\coos
1
I
/\ ecr. NH" Br.
l-.. ll------+ x----->, or?, {D)
cooH
?he product Z is
10. The major product formed when
(A) aniline (3R, 4R)-dimethylhexa-1,S-diene is
heated at 240 'C is
(B) phenol (A) (22, 6zl-octa-2,6-diene
(B) (28, 6E)-octa-2,6-diene
(C) benzene
(C) (2E, 6Zl-octa-2,6-diene
(D) benzenediazoniumchloride lDl l3z, 5E)-octa-2,6-diene
CHEX/CHSO1N/| 124162-A 3 I P.r.o.
Text of page 4
11. The symmetry point group of m- 15. In the coordination complex ions
><ylene is given below, which one exhibits
lowest enerry electronic absorption
band?
(B) (A) [Nic14]2-
'
(cl c2, (B) [N(H2O)6]2+
(D\ Dzn (c) tNi(cN)412-
(D) Ni(co)4
12. Which one of the following
compounds does not give a tertiarJi
alcohol on reaction with methyl 16. Which one of the following is the
magnesium bromide followed by strongest base?
hydrolysis? (A) pH3
(A) 3_methylpentanal
{B) NHs
(B) Ethyl benzoate (c) PPh3
{c} 4,4-dimethylcyclohexanone (D) NH2CH3
(D) 4-heptanone
17. The pK" value of the following
hydrogen halides namely HI' HBr'
13. The oxidation number of ohosohorus
- follows which one of the
in the molecule Hap2o6 is I91--o '"
following orders?
(A) ++
(A) HF < HCt < HBr < HI
(B) +o (B) HI < HBr < HCI < HF
(c) -6
(c) HCI < HBr < HI < HF
(D) -4
(D) HC1 < HF < HBr < HI
14. The compounds B5He and B4H1q are 18. The complexes [co(H2o)aCl2]No
respectivelv and [co(H2o)acl(Nodlci;i
- 2
(A) nido and arachno boranes (A) ionization isomers
(B) nido and closo boranes (B) positional isomers
(C) closo and arachno boranes (C) linkage isomers
(D) Both are nido boranes (D) optical isomers
CHEX/CHSOTN/t / 24 I 52-A 4
Text of page 5
19. Choose the correct statement 22. Which one of the following factors
regarding Fischer and Schrock does not affect the magnitude
carbene complexes, of ligand field splitting in a
coordination complex?
(A) A Fischer carbene complex has
a triplet carbene. (A) Oxidation state of the metal ion
(B) A Schrock carbene complex has (B) Identity of the metal
a singlet carbene.
(C) Magnetic property of the
(C) Fischer carbene is electrophilic complex
in nature. (D) Nature of the ligand
(D) Schrock carbene is electrophilic
in nature.
23. The trend in ligand-to-metal charge
transfer {LMCT} transition enerry is
20, Jahn-Teller effect is expected to be
weak in an octahedral complex of (A) voi- > cro?- > Mno;
which of the following metal centres?
(B) Vo;- > cro!- < MnoJ
(A) High spin Cr(IIXd4)
(B) Cu(II)(de) (c) vo?- > Mnoa > Crof;-
(c) Low spin Cr(II)(d4) (n) Cro!- < voi- < Mno;
(D) Low spin Co(IIXd7)
If f is the tugacity and p is the
21. Which one of the following pressure of a gas, then which one of
statements is not correct? the following expressions is correct?
(A) An Ln3* ion is a soft Lewis acid. (A) Lt 1=o
p+1p
(B) An Ln3+ ion is a hard Lewis acid.
(C) The spin only formula is f
not appropriate for estimating tet r!:or=1
values of p"g (effective magnetic
moment) for lanthanide metal
ions. (c) p+o I=o
p
",
(D) An Ln3* ion prefers to bind
with oxygen atom coordinating (D) u I=r
ligands. p+L p
CHEX/ cHSOrN/t I24I s2-A 5 I P.r.o.
Text of page 6
25. At temperature ?= 0 and T= o", what 24. Dehydrogenation of ethane to form
will be the partition functions ethene according to Rice-Herzfeld
respectively, if in a three-level mechanism follows the sequence
system, all levels are non-degenerate given below :
having energies 0, e, 2s, respectively?
(i) CH3CH3 -------+ 2CH3 o
(A) 0 and 3 (ii) CH3r+69.-"Hs+
(B) 1 and 3 CH4 + CH3CH2 .
(C) 0 and oo (iii) CH3CH2 o --------, CH2 : CH2 + H o
(D) 1 and ." (r9 Ho+CHsCHs--------+
H2 + CH3- CH2 '
Which one of the following
26. From entropy production definition statements is correct?
for alt irreversible processes
occurring within a system, it can be (A) (i) and (ii) are initiation steps.
proved that (B) (ii), (iii) and (iv) are propagation
steps.
(A) primary coefficients are always (C) (ii) and (iii) are propaga.tion
positive but cross-coeflicients steps.
afe always negative
(D) (iii) and (r9 are termination
(B) primary coefficients may be steps.
positive or negative
29. For a reaction between tq/o species
(C) primary coefficients are always A and B in a solution, the overall
negative reaction scheme may be considered
as
(D) cross-coefficients may be a+r $ 1aa)
j-+ Product (P)
k4
positive or negative but primary
coefficients are always positive If we consider overall rate law to be
second order, then the second-order
rate coefficient is
27. For a three-component system at ,- - /crhs
constant temperature (but not at "2 (q +[n
constant pressure), the phase fule is
If the rate of breakup of encounter
(A) 4-P pair (A@ is much slower than the
rate at which it forms the product,
(B) s-P then the expression of the rate law
given above reduces to
(c) 3-P (A) k2= 4 (B) kz= k+
(C) ,c2, q (D) k2. k3
lDl 2-P
cHEx/cHSorN/r / 24 I 52-A 6
Text of page 7
30, According to Michaelis and Menten 33. In a reversible reaction going from
proposition, the rate of enzymolysis reactant to product, an amount of
depends on 250 kJ/mol of eners/ is released.
The reaction is exothermic. If the
(A) the amount of enzyme added temperature of the reaction is
only increased, then
(B) the amount of substrate (A) equilibrium will shift tovi/ards
present only the products
(C) both the amount of enz5rme and (B) equilibrium will shift towards
substrate added the reactants
(D) None of the above (C) position of equilibrium will
remain unchanged
(D) the reaction will become
31. Half-life for a third-order reaction irreverslble
3A -) Products
where a is the initial concentration
of A, is given by which one of the 34. For the electrochemical cell
following expressions?
As/Ascl/Mcl (0.01 lv4l
MCI(o'o2 MlAecU^e
.) c
(A)
ffi (B) 3k" the junction potential is highest
when M+ is
(c)
3
(D)
(A) H*
2k" 3ka2
(B) Li+
(C) Na+
32. Osmometric method of molecular
weight determination of macro- (D) K*
molecules determines
(A) weight average The heat evolved during a polymeri-
molecular weight zation reaction is attributed to
(B) number average (A) decrease in entropy
molecular weight
(B) decrease in enthalpy
(c) viscosity average
molecular weight (C) increase in Gibbs'free energz
(D) sedimentation average (D) increase in both entropy and
molecular weight enthalpy
CHEX/CHSOTN/r I 24 I 52-A 7 IP.T.o.
Text of page 8
36. From Debye-Hrlckel theory, which 39. In gravimetric analysis of nickel
one of the statements given below in steel, Ni2* ions are brought into
is not coffect? solution using concentrated acids.
The solution is t]len made alkaline
(A) Debye length decreases with and Ni2* precipitated out using
increasing ionic strength. which one of the following reagents?
(B) Higher the concentration of (A) o-nitroso-p-naphthol
ions, more effective is the
shielding. (B) Dimethylglyoxime
(C) Low concentration of highly
charged ions may form an (C) 8-hydroryquinoline
effective shielding.
(D) Oximidol : enzotetronic acid
(D) Debye length decreases with
increasing permittivity.
tto. Chlorophenol red is an organic
dye which is used in analytical
37. In which one of the following chemistry as a/an
techniques of studying fast reactions,
monitoring concentration and (A) redox indicator
measurement of rate coeffrcients
are not used? (B) adsorptionindicator
(A) Flash photolysis (C) pH indicator
(B) Flow techniques (D) colorimetric indicator
(C) Relaxation methods
(D) Molecular beams 41. In the flame test for detection of
metals, concentrated HCI is used
instead of other acids because
concentrated HCI converts most
38. An inorganic salt on strong metal ions to the chlorides which are
heating gives a cracking sound
accompanied by evolution of a brown (A) coloured solids
gas. The inorganic salt is
(A) AgBr (B) volatile compounds
(B) cds (C) W active on exposure to
Bunsen flame
(c) Pb(Nod2
(D) reduced to the metallic state
(D) CuI2 by flames
cHEx/cHsorN/r / 24 I 52-a
Text of page 9
42. An alkaloid, on heating with 45. The structure of the alka-ioid
hydroiodic acid at 126 "C, gives five piperine is given below :
molecules of methyliodide besides o
\.-v u
other products. This indicates
that the alkaloid fiss _ in its /o-rrsrs-.J(*--r.,
structure.
(A) five groups The major product formed on
-NMe2
hydrolysis of this alkaloid with KOH
(B) five groups gives which one of the following
-OMe
products?
(C) five groups
-COOMe
(D) five groups
(A) (
/o.-.rr\-\,,.\--"oo'
-SMe l. ll
\o,.^\r'
43. Morphine on heating with phenyl-
trimethylammonium hydroxide at Ho:..,7>.-.l.-1,.2'..1L,'cooH
130 'C forms a monomethyi (B)
derivative. The reaction involves Ho,,,\,,!
()3 ^"
methylation of the
(A) secondary alcoholic group in
morphine
,",
(B) tertiary nitrogen atom
morphine .o) /o)i\'-\"\'-cHo
(C) phenolic group
\o.'9
morphine -OH
The final product obtained on
(D) primary ---OH group in exhaustive methylation of the
morphine compound
44. Which one of the following alkaloids
a.t.)
\-.NJ
is not an opium alkaloid?
is
(A) Morphine (A) r'\r,,\-\..,\
(B) Cocaine (B) Z\--\/^v/\--
(C) Papaverine (c\ z\r\z-\,,--\
(D) Codeine (Dl 2\,,'-,-Z\/.2\
CHEX/CHSOTN/t / 24 I 52-A I lP.T.o.
Text of page 10
47. The principal site of drug 51, The term 'psychotropic substance'
metabolism is denotes mind-altering drugs. Which
one of the following is not a
(A) stomach psychotropic substance?
(B) liver
(A) Phencyclidine
(C) kidney
(D) colon (B) Barbiturate
(C) Amphetamine
48, In drug-receptor interactions, the
constant I(. refers to
" (D) Lysergic acid trimethylaniline
(A) the drug concentration required
to occupy 50%o of receptors
(B) maximal physiological efrect s2. one of the key reactions in the
(C) maximal binding biosynthesis of alkaloids is
(D) All of the above (A) Mannich reaction
49. Which one of the following processes (B) Williamson ether synthesis
does not occur in phase I
metabolism? (C) Diels-Alder reaction
(A) Oxidation
(D) Grig:nard reaction
(B) Reduction
(C) Conjugation
(D) Hydrolysis 53' An alkaloid is defined as a
cyclic organic compound containing
nitrogen in a oxidation state.
5O. The major route of elimination of
the volatile general anaesthetics is (A) positive -
via the
(A) kidney (B) nesative
(B) skin
(C) neutral
(C) lungs
(D) liver (D) A1l of the above
cHEx/cHSOrN/t / 24 I 52-A 10
Text of page 11
54, In a 400 MHz 1tl-NMR spectrum, all Both NMR and NQR spectra are
organic compound exhibited a observed in which one of the
doublet. The two lines of the doublet following regions?
are at 62'35 and 62.38 ppm. The
coupling constant (J) value is (A) Microwave
(A) 3 Hz (B) UV-visible
(B) 6 Hz (C) x-ray
(C) 9 Hz (D) Radio frequency
lDl 12 Hz 57. The electrons which contribute to
isomers in M6ssbauer spectroscopy
55. An organic compound having are
molecular formula C15H1aO shows
the following lH- and 1sC-NMR (A) s-electrons
spectral data : (B) l2-electrons
IH-NMR : 62.4(s), 2.2(d, J= BHzl,
(C) d-electrons
7'71d, J= I Hzl
l3c-NMR : 621.0, 6129.0, 6130.0, 6136.0, {D} felectrons
6141.O,6190'0
On the basis of the above data, Which one of the following properties
the structure of the organic of a molecule must change for an
compound is absorption mode to be Raman
active?
</\y
(A) Volume
., (B) Dipole moment
(c) Density
o
(D) Polarity
tq {__,rKF(
The wave number 1in cm-l) range for
(c)
oaoa\) ultraviolet region of the spectrum is
(A) 2oooHoooo
(B) 4OOOO-8O0OO
,, db_ (c) 25000-soooo
(D) so000-100000
CHEX/CHSOTN/1 / 24 I 52-A l1 I P.T.o.
Text of page 12
60. The aslmmetric vibration in the CO2 63. Which one of the following
molecule is compounds will give the highest
carbonyl grouP absorPtion
(A) IR active but Raman inactive frequency?
-z-NH
(B) IR inactive but Raman active (l\) [ tso
(C) IR inactive and Raman inactive H
-.N,.-.rA
(D) IR active and Raman active (B) I l'
\-/
H
---N,
61. The uncertainff in the lifetime (C) [ )-O
of an electronic excited state is L---/
10-8 seconds. The natural width of
the spectral line corresponding to a
transition wouid be close to
(A) 10 GHz
(B) 1 GHz 64. Which one of the following
techniques is used to determine
(C) 0'1 GHz binding enerry?
(4 FTIR
(D) 0'01 GHz
(B) X-ray powder diffraction
(C) X-rayphotoelectron
spectroscopy
62. The presence of a bromo group in an
organic molecule can be conclusively (D) Mdssbauer spectroscopy
proved by its
65. The experimental technique used to
(Al UV spectra study the surface morphologr is
(B) IR spectra (A) P-XRD
(B) F-rrR
(C) mass spectra
(C) TGA
(D) IH-NMR spectra (D} SEM
cHEx/cHSorN/l / 24 I S2-A L2
Text of page 13
56. The cotrect order of energ/ required 69. Which one of the following molecules
for electronic transition to occur is exhibits rotational spectra?
(A) o-to* > :r-+fi* > n-+o' (A) Carbon monoide
(B) o-+o" > ,r+6'> ,r-+r* (B) Hydrogen
(C) Nitrogen
(C) o-+o'> n-+n* > l-+n"
(D) Carbon dioxide
(D) 7r-+rr. > n-+r* > o-+o*
70. Which one of the following
statements is not correct regarding
67. Which one of the following polarographic measurement proce-
complexes has the lowest eners/
dure?
of C--O stretching vibration?
(A) 02 is removed.
(A) tv(co)61-
@) Dropping mercury electrode is
(B) [Mn(co)61- the working electrode.
(c) [ri(co)612* (C) 16 is proportional to concen-
tration of the electroactive
substance.
(D) [Fe{CO)6}2+
(D) Residual current is made zero by
adding supporting electrolyte.
68. In the mass spectra, the molecular
ion peak of an organic compound
appears at odd m/z value. The odd ?f. In the mass spectra of a hydro-
molecular ion peak is due to the carbon of molecular formula C26H29,
presence of the approximate ratio of the M and
M+ 1 peak is
(A) chlorine atom in the molecule
(A} 1:1
(B) bromine atom in the molecule
(B) 5:1
(C) nitrogen atom in the molecule (C) 1o:1
(D) deuterium atom in the molecule (D) 20:1
CHEX/CHSOTN/1 / 24 I 52-A 13 lP.T.o.
Text of page 14
A weak acid is titrated against a 75. Which one of the following
weak base. Which one of the compounds will give a base Peak of
following will be an ideal indicator to
detect the end point? L=st
z
in the mass spectrum?
(A) Congo red
(A) Ethylbenzene
(B) Methylene blue
(B) Benzyl alcohol
(C) Phenolphthalein
(C) Acetophenone
(D) Methyl orange
(D) Bufialdehyde
73. In a tarbon dating' application of 76. List-I gives the names of some
alkaloids and List-II gives the names
radioisotope 14c, thu emission that
monitored is of the class of alkaloid to which they
belong. Match List-I and List-II and
give the cortect match from the
(A) p-particleemission codes given below :
List-I List-II
(B) d-particleemission (Alkaloid) [Closs.l
(C) y-radiation a. (+) Coniine 1. Cinchona
alkaloid
(D) positron emission b. Atropine 2. Hemlock
alkaloid
c. (-) Cocaine 3. Solanaceous
74. A metai chelate that can be used for alkaloid
separation and quantitative analysis
of aluminium by gas chromato- d. (-) Quinine 4. Coca alkaloid
graPhy is Codes :
(A) a b c d
(A) EDTA 1324
(B) a b c d
(B) ethylene glycol 2314
(C) a b c d
(C) dinonyl phthalate 2341
(D) a b c d
(D) trifluoroacetylacetone 7243
CHEX/CHSOTN/r / 24 I 52-A L4
Text of page 15
77. ln a gas chromatographic analysis, 8O. Gas chromatography can be used as
two hydrocarbons octane and decane an analytical tool for compounds
are separated. The retention time of which are
the two compounds are respectively
2'53 and 4'75 minutes. If the (A) vorat e and thermally unstable
retention time of impuritSr is
0'90 minutes, t]:en t]le retention (B) non_volatile and thermally
factor for octane is ' ' stable
l l 4.27
(C) volatile and thermally stable
(B) 1.81
(C) 2.36 (D) non-volatile and thermally
unstable
(D) s.3s
78. In which type of chromatography, 81. Solvent programming in HPLC
the stationary phase is more polar means
than the mobile phase?
(A) successive injection of samples
(A) Ion-exchange chromatography
(B) Normal phase chrornatography (B) changing the mobile phase
composition
(C) Reverse phase chromatography
(D) size exclusion chromatography (c) changing the column length
(D) changing the column
79. Capillary columns may present a temperature
problem to the user since residual
silanol groups tJ:at are usually
present on the surface of the silica
in a chromatographic analysis may 82. Which one of the following gases is
lead to physical adsorption of polar not used as a carrier gas in a gas
compounds. This is manifested in chromatography experiment?
the chromatogram by
(A) Helium
(4 peak sharpening
(B) peak broadening or total (B) Hydrogen
absence of peak
(C) Nitrogen
(C) early desorption
(D) peak tailing (D) oxYgen
cHEX/ cHSOTN/ | /241 52-A 15 I P.T.O.
Text of page 16
83. Which one of the following is the 85. The distance between two
correct relative retention time (RRT) consecutive [2,2, 1] planes ofa cubic
formula used in HPLC? lattice $rith side 6 A is
(A} RRT= 4
(424
lT" - T,l
(B) 4A
lBl RRT = g, 4 (c) o.s A
-r"l
(D) o.2s A
rc) RRr_(4-4)
Ta
85. Which one of the following is not a
green solvent?
{DI RRT=A
r,
(A) Ionic liquid
where Io - retention time for
analyte
(B) Supercritical carbon dioxide
Tr = retention time for
reference
(C) Chloroform
(D) Polyethylene gJycol
84. which one of the following
statements is not cotrect for
adsorption process?
87, Which one of the following
(A) Enthalpy of adsorption i" will give the Cannizzaro,s
always negative. "ompounds
reaction?
(B) Entropy of adsorption may (A) Acetaldehyde
either be positive or negative.
(B) BenzaldehYde
(C) Free enerry change of adsorp-
tion is always negative.
(C) PropanaldehYde
(D) Helmholtz work function is
positive. (D) Phenylacetaldehyde
CHEX/ CHSOIN/r l24l S2-A 16
Text of page 17
88. While carrying out an organic trans- 91. Which one of the following factors
formation, if you start with 1Og does not aflect the voltage produced
of the substrate (MW= l0O) and you by a galvanic cell?
get l0 g of the product (MW = 200),
the percentage yield will be (A) Temperature
(A\ 25o/o t"' of electrolsrte
"Ti;.'"T:"tt"
(B) -50% (C) Surface area of electrodes
(D) Length of the saJt bridge
lcl 75vo
(D) 100% 92. The reagent which is used to
distinguish between phenol and
benzoic acid is
t'' :h":i,X* ulo?"'."%""';f'
respectively
:T (A) neutrar Fecr3
(B) Tollens, reagent
(l{} Cau and, C2u (C) aqueous NaoH
(D) dilute AgNo3
(B) e, and c4,
lcl C2" and Dan 93. Among the following compounds,
which one will be most acidic?
(D) c+' and Da1
(A) 2-chroroethanol
(B) Phenol
9O, In a homogeneous catalytic reaction,
1'o pM catalyst is added to a solution (C) ocresol
containing 1.OM of a substance. (D) o_nitrophenol
If the reaction yields 1.O mM of a
product in 1O seconds, what will be
the turnover frequency (TOF) of the 94. Electronic absorption spectral ba'ds
reaction? of lanthanoid ion comllexes adsing
from ff trahsitions are
(A) 1O-2 sec-1
(A) sharp
(B) 103 sedl
(B) broad
(C) 102 sec-1 (C) strong
(D) 10-3 sec-1 (D) dependent on the type of ligand
CHEX/CHSOIN/r / 24 I 52-A L7 IP.T.O.
Text of page 18
95. Which one of the following proteins 98. The number of nodes present in
does not contain iron? the HOMO of 1,3,5-hexatriene in its
ground state is
(A) Cytochrome P45s
(A) one
(B) Hemerythrin
(B) two
(C) Rubredoxin
(C) three
(D) Carboxypeptidase
(D) zero
96. Which one of the following or<yacids
of chlorine is the strongest acid in 99. Which one of the following reagents
aqueous solution? is used in the laboratory for the
detection of a carbonyl compound?
(A) HCIO4
(A) Hydro:rylamine
(B) HCIO3
(B) Hydrazine
(c) Hocl
(C) Semicarbazide
(D) HC1O2
(D) 2,4-dinitrophenylhydrazine
97. Sarnpliflg in analytical chemistry is
1OO. In inorganic salt analysis, the Noi
(A) acquiring a representative anion radical is detected by a test
fraction from the material to be known as the 'brown ring test'. The
alalyzed brown ring is obtained due to the
formation of
(B) a substance or chemical
constituent that is being 14 [Fe(NO]3(H2O]2ISOa
analyzed
(C) a procedure of calibrating the (B) H2Fe(cN)6'6No
instruments used
. reageflt (c) [Fe(H2o)5 No]Soa
(D) screening of appropriate
and physical parameters for
doing chemical analysis (D) FeSOa'3HNO3
CHEX/CHSOTN/r / 24 I 52-A 1a
Text of page 19
SPACE FOR ROUGH WORK CHEX/CHSOTN/1 / 24 I 52-A 19 lP.T.O,
Text of page 20
SPACE FOR ROUGH WORK
***
CHEX/CHSOTN/t / 24 I 52-A 20 24T-3Ox4
Text of page 1
q--r=r c<f+-<H-<f qfc'=rT€f
Provisional Answer Key of OMR based Screening Test for
recruitment to the post of chemical Examiner (Excise) Assam under Excise Department
held on21.06.2024
(Advt. No. 2712023 Dtd' 2011012023)
Subiect: Paper - I (Chemistry & Sophisticated Instruments)
SerieB : A
100 Timer 2:00 hours
Mark$:
Q.NO. ANS_KEY Q.NO. ANS_KEY Q.NO. ANS KEY Q.NO. ANS KEY
I D 26 D 51 D 76 C
2 B 27 A 52 A 77 B
3 B 28 B 53 B 78 B
A 29 A 54 D 79 B
4
A 30 C 55 D 80 C
5
C 3l A 56 D 81 B
6
A 32 B 57 A 82 t)
1
B JJ B 58 B 83 D
8
o B 34 A 59 C 84 A
10 B 35 B 60 A 85 A
C 36 D 6l C 86 C
l1
D 62 C 87 B
t2 A 37
A 38 C 63 D 88 B
13
B 64 C 89 C
14 A 39
40 D 65 D 90 C
t5 A
4l B 66 B 91 D
16 D
A 42 B 67 C 92 A
17
C 68 C 93 D
18 A 43
44 B 69 A 94 A
19 C
45 A 70 D 95 D
20 C
A 4t.) A 71 D 96 A
21
47 B 12 C 9'7 A
22 C
48 C 73 A 98 B
23 A
an 49 C 74 D 99 D
B
C 75 A 100 C
25 B 50
er-h
Text of page 2
+& rwr<:a-ref
.E?
Provisional Answer Key of OMR based Screening Test for
under Excise Department
recruitment to the post of Chemical Examiner (Excise) Assam
held on21.06.2024
(Advt. No' 27 12023 Dtd' 201 1012023)
Subiect: Paper - I (Chemistry & Sophisticated Instruments)
Series : B
Time: 2:00 hours
Marks: 100
ANS KEY
Q.NO. ANS KEY Q, NO. ANS KEY Q. NO, ANS KEY Q.NO.
26 B 51 A 76 A
1 R
27 B i./. ts 77 B
2 B
28 A 53 A 18 D
-) B
A 54 C 79 D
4 C 29
C 55 A 80 D
5 B 30
A 56 B 81 A
6 t) 31
B 57 B 82 B
7 D 32
B 58 A 83 C
8 A 33
B 59 B 84 A
9 A 34
C 60 D 85 C
10 C 35
6l D 86 C
11 li 36 A
A 62 C 87 D
12 B 37
A 63 B 88 C
13 C 38
A 64 D 89 D
14 C 39
D 65 B 90 B
l5 D 40
A 41 A 66 B 9l C
16
A 67 C 92 C
17 D 42
C 68 t] 93 A
18 A 43
C 69 A 94 D
19 D 44
A 70 A 95 D
20 A 45
C 71 It 96 C
2t A 46
47 A 72 C 97 A
22 B
B 73 C 98 D
23 D 48
B 74 C 99 A
24 C 49
75 D 100 C
25 D 50 D
b---n
Text of page 3
E{-=,{-q- Cq-r+-c:-<-r qt-c:=ri€f
Provisional Answer Key of OMR based Screening Test for
recruitment to the post of Chemical Examiner
(Excise) Assam under Excise Department
held on21 06.2024
(Adrt' No' 2712023 Dtd' 2011012023)
Instruments)
Subiect: Paper - I (Chemistry & Sophisticated
Series : C
r00
Time: 2:00 hours
Mark!:
ANS-KEY Q.NO. ffi.No.
I
Q.NO.
lar
20 C 51 A 76 C
1 B
21 A 52 B 77 A
2 C
28 D 53 D 78 B
3 C
29 A 54 C 79 B
4 C
C 55 D 80 D
5 t) 30
B 56 B 81 A
6 A 31
B 57 B 82 B
7 B
33 B 58 A 83 A
8 D
C 59 A 84 C
9 D 34
35 B 60 C 85 A
10 D
D 6l A 86 B
11 A 36
D 62 B 87 B
1.2 B
38 A 63 B 88 A
13 C
A 64 B 89 B
14 A 39
C 65 C 90 D
15 C 40
B 66 A 91 D
16 C 41
B 6l A 92 C
17 D 42
C 68 A 93 B
18 C 43
C 69 A 94 D
19 D 44
D 70 D 95 B
20 B 45
A 71 A 96 B
21 C 46
72 A 91 C
22 C 47 D
A l3 C 98 B
23 A 48
49 D 74 C 99 A
24 D
A 75 A 100 A
25 D 50
s----.
Text of page 4
\a--f'=f ci-If=Fc=r=r-r :;IfcEr-f€f
Provisional Answer Key of OMR based Screening Test for
recruitment to the post of chemical Examiner (Excise) Assam under Excise Department
held on21.06.2024
(Advt. No. 2712023 Drd. 2011012023)
Subiect: Paper - I (Chemistry & Sophisticated Instruments)
Series : D
Marks: 100 Time: 2:00 hours
I I
Q. NO. ANS KEY Q.NO. ANS_KEY Q,NO. ANS KEY Q. NO. ANS KEY
1 B 26 C 51 A 76 C
2 D 27 D 52 C 7'7 D
3 A 28 A 53 B 78 B
4 B )o B 54 B 79 B
5 A 30 D 55 B 80 A
6 C 31 D 56 C 81 A
7 A 32 D 57 B 82 C
8 B 33 A 58 D 83 A
9 B 34 B 59 D 84 B
10 A 35 C 60 A 85 B
11 B 36 A 61 A 86 B
12 D 37 C 62 C 87 C
13 D 38 C 63 B 88 A
t4 C 39 D 64 B 89 A
15 B 40 C 65 C 90 A
16 D 41 D 66 C 91 A
17 B 42 B 67 D 92 D
18 B 43 C 68 A 93 A
19 C 44 C 69 D 94 A
20 B 45 A 70 A 95 C
21 A 46 D 1l D 96 C
22 A 41 D 72 A 97 A
23 B 48 C 73 A 98 C
24 C 49 A 74 B 99 A
2) C 50 D 15 D 100 B
ftr.---l'Page 1 of 20
Source: Assam Public Service Commission. Question paper published by Assam Public Service Commission.