First slide

Hydrogen

Question

Out of the following metals which will give H₂on reaction with NaOH
I: Zn, II: Mg, III: Al, IV: Be

Moderate

A

I, II, III, IV
B

I, III, IV
C

II, IV
D

I, III

Solution

In IIA group only Be gives $H_{2}$ gas with alkane solution other alkaline earth metals don't react.
$Be + 2 NaOH + 2 H_{2} O \overset{}{\to} {Na}_{2} {BeO}_{2} . 2 H_{2} O + H_{2}$

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