All the transition metals except scandium form MO oxides which are ionic. [2023]

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Solution

Q.
Which of the following statements are incorrect

(A) All the transition metals except scandium form MO oxides which are ionic.
(B) The highest oxidation number corresponding to the group number in transition metal oxides is attained $S c_{2} O_{3}$ to $M n_{2} O_{7}$ .
(C) Basic character increases from $V_{2} O_{3}$ to $V_{2} O_{4}$ to $V_{2} O_{5}$ .
(D) $V_{2} O_{4}$ dissolves in acids to give $V O_{4}^{3 -}$ salts.
(E) CrO is basic but $C r_{2} O_{3}$ is amphoteric.

Choose the correct answer from the options given below: [2023]

1 C and D only

2 B and C only

3 A and E only

4 B and D only

Ans.
(1)

In vanadium, there is gradual change of basic character from the basic $V_{2} O_{3}$ to less basic $V_{2} O_{4}$ and to amphoteric $V_{2} O_{5}$ . $V_{2} O_{4}$ dissolves in acids to give ${VO}^{+ 2}$ salts.

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