D-And F-Block Elements Ques 77
Question: Which of the following metal gives hydrogen gas, when heated with hot concentrated alkali
[Pb. CET 2002]
Options:
A) Cu
B) Ag
C) Zn
D) Ni
Show Answer
Answer:
Correct Answer: C
Solution:
$ Zn+\underset{Conc\text{.}}{\mathop{NaOH}},\to \underset{\text{Sodium zincate}}{\mathop{Na_2ZnO_2}},+\underset{Hydrogen}{\mathop{H_2}}, $ Thus in this reaction hydrogen gas is produced when zinc is treated with concentrated NaOH.
