Question:

Choose the correct statements from the following:
A. Mn2O7 Mn_2O_7 is an oil at room temperature
B. V2O4 V_2O_4 reacts with acid to give VO22+ VO_2^{2+}
C. CrO CrO is a basic oxide
D. V2O5 V_2O_5 does not react with acid
Choose the correct answer from the options given below:

Updated On: Mar 21, 2025
  • A, B and D only
  • A and C only
  • A, B and C only
  • B and C only
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The Correct Option is B

Solution and Explanation

Let’s analyze each statement individually:

Statement A: Mn2O7 \text{Mn}_2\text{O}_7 is an oil at room temperature. - Mn2O7 \text{Mn}_2\text{O}_7 (manganese heptoxide) is indeed a dark green oil that is highly unstable and explosive at room temperature. It is a covalent oxide and behaves as an acidic oxide due to its high oxidation state. Therefore, this statement is correct.

Statement B: V2O4 \text{V}_2\text{O}_4 reacts with acid to give VO22+ \text{VO}_2^{2+} . - V2O4 \text{V}_2\text{O}_4 (vanadium(IV) oxide) is an amphoteric oxide. It can react with acids, undergoing oxidation, to form the VO22+ \text{VO}_2^{2+} ion (vanadyl ion). This reaction occurs as:

V2O4+2H+2VO22++H2O \text{V}_2\text{O}_4 + 2\text{H}^+ \to 2\text{VO}_2^{2+} + \text{H}_2\text{O}

Therefore, this statement is also correct.

Statement C: CrO \text{CrO} is a basic oxide. - CrO \text{CrO} (chromium(II) oxide) is a basic oxide. It reacts readily with acids to form salts and water. For example:

CrO+2HClCrCl2+H2O \text{CrO} + 2\text{HCl} \to \text{CrCl}_2 + \text{H}_2\text{O}

This confirms that CrO \text{CrO} behaves as a basic oxide, so this statement is correct.

Statement D: V2O5 \text{V}_2\text{O}_5 does not react with acid. - V2O5 \text{V}_2\text{O}_5 (vanadium(V) oxide) is an amphoteric oxide, meaning it can react with both acids and bases. In fact, V2O5 \text{V}_2\text{O}_5 can react with acidic solutions, such as hydrochloric acid, and undergo reduction. Therefore, this statement is incorrect.

Since statements A and C are correct, the correct answer is Option (2).

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