Match the following :Reactivity of SubstanceExample(a) Spontaneously and/or vigorously react with water(i) Dynamite(b) Spontaneously and/or vigorously react with air(ii) Aluminium nitrate(c) Generate toxic fumes(iii) Phosphorous pentaoxide(d) Explosive substance(iv) Trimethyl aluminium

The correct matching is a-iii, b-iv, c-ii, d-i.(a) Reacts vigorously with water: phosphorus pentoxide, which reacts violently and exothermically with water to give phosphoric acid; it is a powerful dehydrating agent.(b) Reacts spontaneously with air: trimethylaluminium, which is pyrophoric and ignites on contact with air.(c) Generates toxic fumes: aluminium nitrate, which gives off toxic nitrogen oxides when heated or in a fire.(d) Explosive substance: dynamite.Option B puts trimethylaluminium against water and phosphorus pentoxide against air; trimethylaluminium does react with water too, but its defining hazard is ignition in air, and phosphorus pentoxide is not air-reactive. Options A and C pair dynamite with air or water reactivity, which misplaces the one explosive.

Match the following and select the correct answer from the codes given below :Nature of Hazardous SubstanceExample(a) Ignitible(i) Lead salts(b) Corrosive(ii) Polyaromatic hydrocarbons(c) Carcinogenic(iii) Sulphuric acid(d) Toxic(iv) White phosphorous

The match is a-iv, b-iii, c-ii, d-i.Ignitable: white phosphorus, which catches fire spontaneously in air.Corrosive: sulphuric acid, which destroys tissue and metal.Carcinogenic: polyaromatic hydrocarbons, such as benzo(a)pyrene, known to cause cancer.Toxic: lead salts, which poison the nervous system and blood.Sulphuric acid is the clear corrosive, and only option B pairs corrosive with it (b-iii). Options A and D call white phosphorus corrosive, and option C pairs ignitable with lead salts.

Match the following :Group of Corrosive SubstanceExample(a) Strong acids(1) Bromine trifluoride(b) Strong alkali(2) Oxygen difluoride(c) Strong oxidants(3) Sulphuric acid(d) Strong dehydrating agents(4) Potassium hydroxide

The correct matching is (a)-(3), (b)-(4), (c)-(2), (d)-(1).Sulphuric acid is the classic strong acid: (a)-(3).Potassium hydroxide (caustic potash) is a strong alkali: (b)-(4).Oxygen difluoride, OF2, is a powerful oxidising and fluorinating agent: (c)-(2).Bromine trifluoride, BrF3, reacts violently with water and is placed among the strong dehydrating agents in this classification: (d)-(1).The first two pairs settle the answer, since only one code puts sulphuric acid with the acids and potassium hydroxide with the alkalis. The other codes call sulphuric acid an oxidant or an alkali, or match potassium hydroxide with dehydrating agents.

Hazardous Waste Management Questions and Answers

Q: Schedule II of the Hazardous Waste (Management Handling and Transboundary Movement) Rules, 2016 gives :

Schedule II gives the list of waste constituents with concentration limits.Under the Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016, a waste is hazardous if it comes from a process listed in Schedule I, or if it contains any constituent listed in Schedule II above the concentration limit given there. Schedule II is therefore the concentration-limit test.Schedule I is the list of processes generating hazardous waste. Schedule III lists the hazardous wastes applicable for import and export, in two parts: those requiring prior informed consent and those not requiring it. So the options about processes and about import and export describe the other schedules.

Q: In which form are annual returns for hazardous waste submitted to SPCB annually ?

The annual return is submitted in Form 4.Under the Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016, every occupier and operator of a disposal facility must keep records of the hazardous waste it handles and file an annual return in Form 4 with the State Pollution Control Board, by 30 June each year for the previous financial year.Forms 5, 6 and 10 are other forms under the same rules, used for other filings such as the transport manifest, not for the annual return. The annual return lets the Board track how much waste each unit generated, stored, recycled and sent for disposal during the year.

Schedule II of the Hazardous Waste (Management Handling and Transboundary Movement) Rules, 2016 gives :

A.List of processes generating hazardous waste
B.List of waste constituents with concentration limits
C.List of hazardous wastes applicable for import and export not requiring prior informed consent
D.List of hazardous wastes for import requiring prior informed consent

Exam Year(s)

MH SET - 2019, SET Exam - 2019,

Answer: B

Schedule II gives the list of waste constituents with concentration limits.

Under the Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016, a waste is hazardous if it comes from a process listed in Schedule I, or if it contains any constituent listed in Schedule II above the concentration limit given there. Schedule II is therefore the concentration-limit test.

Schedule I is the list of processes generating hazardous waste. Schedule III lists the hazardous wastes applicable for import and export, in two parts: those requiring prior informed consent and those not requiring it. So the options about processes and about import and export describe the other schedules.

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Match the following :

Reactivity of Substance	Example
(a) Spontaneously and/or vigorously react with water	(i) Dynamite
(b) Spontaneously and/or vigorously react with air	(ii) Aluminium nitrate
(c) Generate toxic fumes	(iii) Phosphorous pentaoxide
(d) Explosive substance	(iv) Trimethyl aluminium

A.a-iii, b-i, c-iv, d-ii
B.a-iv, b-iii, c-ii, d-i
C.a-i, b-ii, c-iii, d-iv
D.a-iii, b-iv, c-ii, d-i

Exam Year(s)

MH SET - 2019, SET Exam - 2019,

Answer: D

The correct matching is a-iii, b-iv, c-ii, d-i.

(a) Reacts vigorously with water: phosphorus pentoxide, which reacts violently and exothermically with water to give phosphoric acid; it is a powerful dehydrating agent.
(b) Reacts spontaneously with air: trimethylaluminium, which is pyrophoric and ignites on contact with air.
(c) Generates toxic fumes: aluminium nitrate, which gives off toxic nitrogen oxides when heated or in a fire.
(d) Explosive substance: dynamite.

Option B puts trimethylaluminium against water and phosphorus pentoxide against air; trimethylaluminium does react with water too, but its defining hazard is ignition in air, and phosphorus pentoxide is not air-reactive. Options A and C pair dynamite with air or water reactivity, which misplaces the one explosive.

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Match the following and select the correct answer from the codes given below :

Nature of Hazardous Substance	Example
(a) Ignitible	(i) Lead salts
(b) Corrosive	(ii) Polyaromatic hydrocarbons
(c) Carcinogenic	(iii) Sulphuric acid
(d) Toxic	(iv) White phosphorous

A.a-iii, b-iv, c-ii, d-i
B.a-iv, b-iii, c-ii, d-i
C.a-i, b-ii, c-iii, d-iv
D.a-ii, b-iv, c-i, d-iii

Exam Year(s)

MH SET - 2020, SET Exam - 2020,

Answer: B

The match is a-iv, b-iii, c-ii, d-i.

Ignitable: white phosphorus, which catches fire spontaneously in air.
Corrosive: sulphuric acid, which destroys tissue and metal.
Carcinogenic: polyaromatic hydrocarbons, such as benzo(a)pyrene, known to cause cancer.
Toxic: lead salts, which poison the nervous system and blood.

Sulphuric acid is the clear corrosive, and only option B pairs corrosive with it (b-iii). Options A and D call white phosphorus corrosive, and option C pairs ignitable with lead salts.

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In which form are annual returns for hazardous waste submitted to SPCB annually ?

A.Form 4
B.Form 5
C.Form 10
D.Form 6

Exam Year(s)

MH SET - 2021, SET Exam - 2021,

Answer: A

The annual return is submitted in Form 4.

Under the Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016, every occupier and operator of a disposal facility must keep records of the hazardous waste it handles and file an annual return in Form 4 with the State Pollution Control Board, by 30 June each year for the previous financial year.

Forms 5, 6 and 10 are other forms under the same rules, used for other filings such as the transport manifest, not for the annual return. The annual return lets the Board track how much waste each unit generated, stored, recycled and sent for disposal during the year.

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Match the following :

Group of Corrosive Substance	Example
(a) Strong acids	(1) Bromine trifluoride
(b) Strong alkali	(2) Oxygen difluoride
(c) Strong oxidants	(3) Sulphuric acid
(d) Strong dehydrating agents	(4) Potassium hydroxide

A.(a)-(3), (b)-(4), (c)-(2), (d)-(1)
B.(a)-(1), (b)-(2), (c)-(3), (d)-(4)
C.(a)-(2), (b)-(3), (c)-(1), (d)-(4)
D.(a)-(2), (b)-(1), (c)-(4), (d)-(3)

Exam Year(s)

MH SET - 2021, SET Exam - 2021,

Answer: A

The correct matching is (a)-(3), (b)-(4), (c)-(2), (d)-(1).

Sulphuric acid is the classic strong acid: (a)-(3).
Potassium hydroxide (caustic potash) is a strong alkali: (b)-(4).
Oxygen difluoride, OF₂, is a powerful oxidising and fluorinating agent: (c)-(2).
Bromine trifluoride, BrF₃, reacts violently with water and is placed among the strong dehydrating agents in this classification: (d)-(1).

The first two pairs settle the answer, since only one code puts sulphuric acid with the acids and potassium hydroxide with the alkalis. The other codes call sulphuric acid an oxidant or an alkali, or match potassium hydroxide with dehydrating agents.

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