sblock Elements - Result Question 7
####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:
$Zn+$ Dil. $NaOH \longrightarrow Na _2 ZnO _2+H _2 \uparrow$
$Zn+2 HCl$ (dil.) $\longrightarrow ZnCl _2+H _2 \uparrow$
