sblock Elements 1 Question 3
3. The metal that gives hydrogen gas upon treatment with both acid as well as base is
(a) magnesium
(b) mercury
(c) zinc
(d) iron
(2019 Main, 12 April I)
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Answer:
Correct Answer: 3. (c)
Solution:
- Metal that gives hydrogen gas upon treatment with both acid as well as base is zinc. Hence, it is amphoteric in nature.
Reactions involved are as follows:
$\mathrm{Zn}+$ Dil. $\mathrm{NaOH} \longrightarrow \mathrm{Na} _{2} \mathrm{ZnO} _{2}+\mathrm{H} _{2} \uparrow$
$\mathrm{Zn}+2 \mathrm{HCl}$ (dil.) $\longrightarrow \mathrm{ZnCl} _{2}+\mathrm{H} _{2} \uparrow$
