Chemical Process
Pick out the endothermic reaction out of the following.

CaCO₃ = CaO + CO₂
C+1/2O₂ = CO
CO + 3H₂ = CH₄ + H₂O
CO +1/2O₂ = CO₂

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

Arc process of nitric acid manufacture is economical as compared to Ostwald
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
Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO₂)

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Chemical Process
Presence of carbonaceous matter in the sewage

Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Reduces sulphate ions to sulphides causing obnoxious smell
All of these
Increases the quantity of chlorine used for its purification

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