Chemical Process
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

It is very corrosive at elevated temperature
It decomposes on further increasing the temperature
None of these
Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)

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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
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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