Question

On heating zinc nitrate, the products formed are zinc oxide, nitrogen dioxide and oxygen. Zinc oxide is:

P a black solid

Q brown when hot, yellow when cold

R yellow when hot, white when cold

Which of the following is true?

विकल्प

• Only P

• Only Q

• Only R

• Both Q and R

Answer 1

Only R

Explanation:

Zinc oxide is yellow when hot and white when cold. Therefore, statement R is correct, while P and Q are incorrect.

\[\ce{2Zn(NO3)2 ->[heat] 2ZnO + 4NO2 + O2}\]