First slide

Hydrogen

Question

All the following can liberate hydrogen with alkali except

Easy

A

Al
B

Zn
C

Be
D

Fe

Solution

Be, Al, Zn are amphoteric metals. They not only liberate hydrogen gas with acids but also liberate hydrogen gas with alkalies.
$\begin{array}{l} Be \overset{NaOH}{\to} {Na}_{2} {BeO}_{2} + H_{2}; \\ Zn \overset{NaOH}{\to} {Na}_{2} {ZnO}_{2} + H_{2}; \\ Al \overset{NaOH}{\to} {NaAlO}_{2} + H_{2}; \end{array}$
‘Fe’ cannot react with alkalies.

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