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Action of Water on Calcium Carbide

Two metals ...

Question

Two metals $X$ and $Y$ have $3$ and $2$ electrons in their valence shells $^{'} M^{'}$ and $^{'} N^{'}$ respectively. These metals can form binary compounds $A$ and $B$ with the same non-metal carbon. Both $A$ and $B$ can undergo hydrolysis forming hydrocarbons $C$ and $D$ . Identify $C$ and $D$ .

A

C_{6} H_{6}, C_{3} H_{4}

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B

C_{3} H_{6}, C_{3} H_{4}

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C

{C H}_{4}, C_{2} H_{2}

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D

C_{4} H_{10}, C_{3} H_{6}

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Solution

The correct option is D ${C H}_{4}, C_{2} H_{2}$
The two metals are aluminium $A l$ and calcium $C a$ . As they have 3 and 2 electrons in their valance shells and can form binary compounds carbides $A l_{4} C_{3}$ and $C a C_{2}$ .
$A l_{4} C_{3} + H_{2} O \to H_{4} C$
$C a C_{2} + H_{2} O \to C_{2} H_{2}$

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