When a mixture of sand and \( \mathrm{KNO}_{3} \) is heated strongly the product(s) is/are: (A) ...

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When a mixture of sand and \( \mathrm{KNO}_{3} \) is heated strongly the product(s) is/are:
(A) \( \mathrm{NO}_{2} \)
(B) \( \mathrm{O}_{2} \)
(C) \( \mathrm{K}_{2} \mathrm{SiO}_{3} \)
(D) all of these
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