Question

Choose the correct answers. 

(A) Mn₂O₇ is a oil at room temperature. 

(B) V₂O₄ react with acid to give VO²⁺ 

(C) CrO is a basic oxide 

(D) V₂O₅ does not react with acids. 

(1) A, B and C only 

(2) B, C and D only 

(3) A only 

(4) B and C only

Answer 1

(1) A, B and C only 

A, B and C are correct. 

Mn₂O₇ is a green oil at room temperature. 

V₂O₄ react with acids to give VO²⁺ . 

CrO is Basic and CrO₃ is acidic. 

V₂O₅ react with acids as well as alkali.

Answer 2

A. Mn₂O₇ is an oil at room temperature ✅

• Manganese heptoxide (Mn₂O₇) is a dark green oily liquid at room temperature, making this statement correct.

B. V₂O₄ reacts with acid to give VO₂²⁺ ✅

• Vanadium(IV) oxide (V₂O₄) reacts with acids, reducing to VO₂²⁺, so this statement is correct.

C. CrO is a basic oxide ✅

• Chromium(II) oxide (CrO) is a basic oxide, making this statement correct.

D. V₂O₅ does not react with acid ❌

• Vanadium pentoxide (V₂O₅) is amphoteric and reacts with both acids and bases. So, this statement is incorrect.

Correct Answer: A, B, and C