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Reactions with acids

Which of the ...

Question

Which of the following metals will give $H_{2}$ on reaction with aqueous $N a O H$ :
$I : Z n$ $I I : M g$
$I I I : A l$ $I V : B e$

I, I I, I I I, I V

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I, I I I, I V

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I I, I V

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I, I I I

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Solution

The correct option is B $I, I I I, I V$
Among the alkaline earth metals, only $B e$ gives $H_{2}$ gas on reaction with $N a O H$ as it is amphoteric in nature. Other alkaline earth metals don't react with $N a O H$ as down the group basicity increases. The corresponding reaction is:
$B e + 2 N a O H + 2 H_{2} O \to N a_{2} [B e (O H)_{4}] + H_{2}$
Similarly aluminium also reacts with $N a O H$ liberating hydrogen gas and forming aluminates. The corresponding reaction is:
$2 A l + 2 N a O H + 6 H_{2} O \to 2 N a A l (O H)_{4} + 3 H_{2}$
Again $Z n$ also shows amphoteric nature. On reaction with $N a O H$ it also forms zincates similar to aluminates. The corresponding reaction is:
$Z n + 2 N a O H + 2 H_{2} O \to N a_{2} Z n (O H)_{4} + H_{2}$

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