Discussion
Match the following in case of deciphering of secret writings :
| List - I | List - II |
|---|---|
| a. Soap | i. heat |
| b. Milk | ii. ferric compounds |
| c. Sodium Chloride | iii. water |
| d. Potassium thiocyanate | iv. silver nitrate |
Answer: A
In deciphering secret writings, soap writing is developed with water (a-iii), milk is developed by heat (b-i), sodium chloride is developed with silver nitrate (c-iv), and potassium thiocyanate is developed with ferric compounds (d-ii). That gives iii, i, iv, ii, option A. Options B, C and D pair milk with water or silver nitrate, or soap with silver nitrate or ferric compounds, so they are wrong.
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