A) As
B) Zn
C) Mg
D) Fe
Correct Answer: B
Solution :
Zn displaces hydrogen from the boiling solution of NaOH. \[Zn+2NaOH+2{{H}_{2}}O\to N{{a}_{2}}[Zn{{(OH)}_{4}}]+{{H}_{2}}\uparrow \]
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