Choose the correct statements from the following | jee main chemistry important questions | d And f-Block Elements jee main questions

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Solution

Q.
Choose the correct statements from the following

A. ${Mn}_{2} O_{7}$ is an oil at room temperature
B. $V_{2} O_{4}$ reacts with acid to give ${VO}_{2}^{2 +}$
C. $CrO$ is a basic oxide
D. $V_{2} O_{5}$ does not react with acid

Choose the correct answer from the options given below: [2024]

1 A, B and D only

2 A and C only

3 A, B and C only

4 B and C only

Ans.
(2)

  (A) ${Mn}_{2} O_{7}$ is a covalent green oil.

  (B) $V_{2} O_{4}$ is a basic oxide. It dissolves in acids to give ${VO}^{2 +}$ salts (not ${VO}_{2}^{2 +}$ ).

  (C) $CrO$ is basic and ${Cr}_{2} O_{3}$ is amphoteric.

  (D) $V_{2} O_{5}$ is amphoteric. It reacts with alkalies as well as acids to give ${VO}_{4}^{3 -}$ respectively.

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