Chemical Process
Hydrogen gas is not produced commercially (for nitrogeneous fertiliser manufacture) by

Electrolysis of water
Its cryogenic separation from coke oven gas
Iron-steam reaction
Steam reforming of naphtha

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Chemical Process
Comparing sulphate process with sulphite process, we find that __________ in the later.

Both temperature & pressure in the former is more than that
Pressure is more in the former whereas temperature is less
Both temperature & pressure in the former is less than that
Temperature is more in the former whereas pressure is more

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