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JEE Main202431 Jan 2024Evening ShiftChemistryd and f Block ElementsActual

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:

Options

  1. AA, B and D only
  2. BA and C only
  3. CA, B and C only
  4. DB and C only

Correct answer

B. A and C only

Step-by-step solution

All the metals except scandium form MO oxides, which are ionic. Mn 2 O 7 is a covalent green oil. In vanadium there is gradual change 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. Similarly, V 2 O 5 reacts with alkalies as well as acids to give VO 4 3 - and VO 4 + respectively. The well characterised CrO is basic but Cr 2 O 3 is amphoteric. (A) Mn 2 O 7 is green oil at room temperature. (B) V 2 O 4 dissolve in acids to give V O 2 + salts. (

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