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

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)
It is a strong mono basic acid which reacts with almost all the metals except noble metals
About 90% of nitric acid is manufactured by Ostwald

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Chemical Process
In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

Maintaining low temperature & pressure in the converter
Removing some quantity of SO₃ during intermediate stage
Putting more quantity of V₂O₅ catalyst in the converter
Increasing the oxygen concentration

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