Which of the following can not evolve more than one gas (vapour) if heated in dry test tube: (a)...

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Which of the following can not evolve more than one gas (vapour) if heated in dry test tube:
(a) \( \mathrm{NaNO}_{3}(s) \)
(b) \( \mathrm{MgCO}_{3}(s) \)
(c) \( \mathrm{FeSO}_{4}(s) \)
(d) \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}(s) \)
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