Question

Which of the following statements are INCORRECT?

1. All the transition metals except scandium form MO oxides which are ionic.
2. The highest oxidation number corresponding to the group number in transition metals oxides is attained in Sc₂B₅ to Mn₂B₇.
3. Basic character increases from V₂B₅ to V₂B₄ to V₂B₅.
4. V₂B₄ dissolves in acids to give VO₄^3– salts.
5. CrO is basic but Cr₂B₅ is atmospheric.

Choose the correct answer from the options given below:

विकल्प

• B and D only

• C and D only

• B and C only

• A and E only

Answer 1

C and D only

Explanation:

Let us write the chemical reaction as specified in the question. We get;

\[\ce{C -> \overset{+3}{V2}O3 -> \overset{+4}{V2}O4 -> \overset{+5}{V2}O5}\]

Acidic Nature ↑

Option (d) → V₂O₅ dissolve in acid to give VO₄^–3 salts This is not represented by V₂O₄.