Question

The incorrect statement (s) among (a)-(c) is (are):

1. W(VI) is more stable than Cr(VI).
2. In the presence of HCl, permanganate titrations provide satisfactory results.
3. Some lanthanoid oxides can be used as phosphorus.

Options

• (a) only

• (b) and (c) only

• (b) only

• (a) and (b) only

Answer 1

(b) only

Explanation:

1. Higher oxidation states in transition metals are more stable as one moves down the group because of lanthanoid and actinoid contractions, as well as smaller atom sizes.
2. Because KMnO₄ can oxidize chloride to chlorine, it will produce incorrect results.
3. It’s a fact.