NEET Chemistry: Chemistry of p-Block Elements questions with solutions

Q1. All dilute acids react with bleaching powder, liberating:

1. chlorine gas
2. hydrogengas
3. nitrogen gas
4. \( H C l \) gas

Answer: chlorine gas

Bleaching powder contains hypochlorite/chlorinated lime species that, on treatment with dilute acids, liberate chlorine. The acid converts the chlorine-containing compound into free chlorine gas.

Q2. Which of the following reacts most slowly with nitric acid?

1. Phosphorus
2. Chlorine
3. sulphur
4. lodine

Answer: lodine

Iodine is the least reactive among the given nonmetals, so it is oxidized by nitric acid more slowly than phosphorus or sulfur. Chlorine is already highly electronegative and does not react in the same straightforward way, but among the listed choices the slowest reacting substance is iodine.