A) iron
B) potassium
C) copper
D) mercury
Correct Answer: A
Solution :
(i) \[Cu\] and \[Hg\] cannot liberate hydrogen from acids because they are placed below hydrogen in electrochemical series. (ii) \[K\] liberates \[H\] from acid's but reacts with \[{{H}_{2}}O\]at room temperature. (iii) \[Fe\] is metal which liberates hydrogen from dilute acids and reacts with \[{{H}_{2}}O\] on heating. \[Fe+{{H}_{2}}S{{O}_{4}}(di.)\xrightarrow{{}}FeS{{O}_{4}}+{{H}_{2}}\] \[Fe+{{H}_{2}}O(steam)\xrightarrow{{}}{{H}_{2}}\uparrow \]You need to login to perform this action.
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