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Reactivity with Air and Water (Group 2)

Which of the ...

Question

Which of the following pairs of substances would give same gaseous product on reaction with water?

N a

and

N a_{2} O_{2}

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C a

and

C a H_{2}

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K

and

K O_{2}

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B a

and

B a O_{2}

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C a

and

C a C_{2}

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Solution

The correct option is B $C a$ and $C a H_{2}$
$C a + 2 H_{2} O \to C a (O H)_{2} + H_{2}$

$C a H_{2} + 2 H_{2} O \to C a (O H)_{2} + 2 H_{2}$

In both the above reactions same $H_{2}$ gas is produced.

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