JEE Main 2017 · 2 Apr · Shift 1 · Chemistry Q47

ChemistrySingle correct+4 / -1Question 47 of 90

In the following reactions, ZnO is respectively acting as a/an :

(a) $\ce{ZnO + Na2O -> Na2ZnO2}$

(b) $\ce{ZnO + CO2 -> ZnCO3}$

acid and acid

acid and base

base and acid

base and base

Answer and worked solution

Official answer: B

ZnO is amphoteric. With the basic oxide $\ce{Na2O}$ it acts as an acid (forming zincate); with the acidic oxide $\ce{CO2}$ it acts as a base.

JEE Main 2017 · 2 Apr · Shift 1, Chemistry question 47