Question

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives:

• A. Zn(OH)2
• B. ZnO
• C. [Zn(OH)4]2–
• D. [ZnO2]2–

Answer 1

Answer: (D)

[ZnO2]2–

Answer 2

Zinc reacting with an excess of aqueous alkali to produce hydrogen gas.
$Zn + 2NaOH → Na_2ZnO_2 + H_2$
Sodium Zincate Hydrogen gas
Thus along with H2 it gives Na2ZnO2 or ZnO22-.
So, the correct option is (D): [ZnO2]2–