Chemical Process
Phthalic anhydride is made by the

Oxidation of benzene
None of these
Dehydrogenation of ethyl benzene
Oxidation of naphthalene

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

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

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Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

All of these
Greater tendency of decomposition at elevated temperature
Poor oxidation stability and high gum forming tendency
Hydrolysis tendency in presence of water

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