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  • Which of the following metal(s) on treatment with  will liberate <img alt="\mathrm{H}_2" s

Which of the following metal(s) on treatment with  \mathrm{NaOH} will liberate \mathrm{H}_2 gas?

A. Sn
B. Zn
C. Al
D. Mg

Option: 1

A and B only
 


Option: 2

B and C only
 


Option: 3

A, B and C only
 


Option: 4

D only


Answers (1)

best_answer

Zn, Sn and Al produce hydrogen on reaction with NaOH. Reactions are as follows:

\begin{aligned} & \mathrm{Zn}+2 \mathrm{NaOH} \rightarrow \mathrm{Na}_2 \mathrm{ZnO}_2+\mathrm{H}_2 \\ & \mathrm{Sn}+2 \mathrm{NaOH}+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{Na}_2 \mathrm{SnO}_3+2 \mathrm{H}_2 \\ & 2 \mathrm{Al}+2 \mathrm{NaOH}+2 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{NaAlO}_2+3 \mathrm{H}_2 \\ & \text {and } \mathrm{Mg}+\mathrm{NaOH} \rightarrow \mathrm{MgO}+\mathrm{NaH} \end{aligned}

Posted by

Ajit Kumar Dubey

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