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Question

Sulphates salt gives metal oxide and SO3 (or SO2+12O2) on heating :

A
K2SO4
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B
CaSO4
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C
MgSO4
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D
(NH4)2SO4
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Solution

The correct options are
B CaSO4
D MgSO4
Alkaline earth metal sulphate gives metal oxide and SO3 on heating.
Reaction is:

MgSO4MgO+SO3

CaSO4CaO+SO3

Alkali metal sulphates are thermally stable.

Hence, the correct options are B and C

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