Compound \( X \) changed into white substance along with liberation of neutral oxide and then wh...

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Compound \( X \) changed into white substance along with liberation of neutral oxide and then white substance decomposed into three products among which two are acidic oxides. Among these oxides non-polar oxide can undergo polar cyclic polymer on cooling. The compound \( X \) will be :
(a) \( \mathrm{MgSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O} \)
(b) \( \mathrm{ZnSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O} \)
(c) \( \mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O} \)
(d) \( \mathrm{FeSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O} \)
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