Chemical Process
Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like

All of these
Fragile nature
High cost
Easy poisoning tendency

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

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

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