Which of the following gives volatile gases with dil. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) ? (a)...

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Which of the following gives volatile gases with dil. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) ?
(a) \( \mathrm{CaCO}_{3} \)
(b) \( \mathrm{KNO}_{2} \)
(c) \( \mathrm{Na}_{2} \mathrm{~S} \)
(d) \( \mathrm{ZnSO}_{3} \)
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