Chemical Process
Use of hydrated lime in water treatment

Before filtration, reduces the bacterial load on filters
Is to adjust the pH value
All of these
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂

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

Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO₂)
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

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Chemical Process
Pick out the wrong statement pertaining to solvent extraction of oil.Rate of extraction

Increases with the increasing flake size keeping the flake thickness constant
Decreases as the moisture content of flakes increases
Increases Considerably with the rise of temperature
Decreases with decrease of thickness of the flakes

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