Chemical Process
Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of

Nitric acid
Hydrochloric acid
Formic acid
Methyl alcohol

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Chemical Process
Pick out the wrong statement pertaining to nitric acid.

About 90% of nitric acid is manufactured by Ostwald
It is a strong mono basic acid which reacts with almost all the metals except noble metals
Arc process of nitric acid manufacture is economical as compared to Ostwald
Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO₂)

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