You can make acetylene by dropping water on:

calcium carbonate

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calcium carbide

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chalk

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burning coal

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Solution

The correct option is B calcium carbide
$C a C_{2} Calcium carbide + H_{2} O \to C_{2} H_{2} Accetylene + C a (O H)_{2}$

Thus, by dropping water in calcium carbide, acetylene can be prepared. This is the industrial method of preparation of ethyne or acetylene.

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C a^{2 +} C \equiv C^{2 -} + 2 H_{2} O \to H - C \equiv C - H + 2 O H^{-} + C a^{2 +}

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