Q.61. Correct statements from the following are A. Potassium dichromate is an oxidising agent and it

Q: What is the correct answer for this exam Chemistry Q61?

The correct answer is B. Sol. (A) MnO₄⁻ + Fe²⁺ + H⁺ → Fe³⁺ + Mn²⁺ + H₂O (B) Na₂Cr₂O₇ generally not used as a primary standard in volumetric analysis because it is deliquescent. (C) In acidic medium Cr₂O₇²⁻ exists and it get converted into CrO₄²⁻ in basic medium. 2CrO₄²⁻ + 2H⁺ ⇌ Cr₂O₇²⁻ + H₂O Cr₂O₇²⁻ + 2OH⁻ ⇌ 2CrO₄²⁻ + H₂O (D) K₂Cr₂O₇ is a good oxidising agent and bond angle of Cr-O-Cr bond in Cr₂O₇²⁻ is 126° [Figure: Dich

Q: Q.61. Correct statements from the following are A. Potassium dichromate is an oxidising agent and it oxidises FeSO₄ to Fe₂(SO₄)₃ in acidic medium. B. Sodium dichromate can be used as primary standard…

The correct answer is B. Sol. (A) MnO₄⁻ + Fe²⁺ + H⁺ → Fe³⁺ + Mn²⁺ + H₂O (B) Na₂Cr₂O₇ generally not used as a primary standard in volumetric analysis because it is deliquescent. (C) In acidic medium Cr₂O₇²⁻ exists and it get converted into CrO₄²⁻ in basic medium. 2CrO₄²⁻ + 2H⁺ ⇌ Cr₂O₇²⁻ + H₂O Cr₂O₇²⁻ + 2OH⁻ ⇌ 2CrO₄²⁻ + H₂O (D) K₂Cr₂O₇ is a good oxidising agent and bond angle of Cr-O-Cr bond in Cr₂O₇²⁻ is 126° [Figure: Dich

Q: What are the options for this this exam Chemistry question?

A. A, B and C only · B. A, C and D only · C. A and C only · D. B and D only

Question

Q.61. Correct statements from the following are A. Potassium dichromate is an oxidising agent and it oxidises FeSO₄ to Fe₂(SO₄)₃ in acidic medium. B. Sodium dichromate can be used as primary standard in volumetric estimation. C. CrO₄²⁻ and Cr₂O₇²⁻ are interconvertible in aqueous solution by varying the pH of the solution. D. Cr–O–Cr bond angle in Cr₂O₇²⁻ is 126°. Choose the correct answer from the options given below:

FirstInTest · Accepted Answer

Sol. (A) MnO₄⁻ + Fe²⁺ + H⁺ → Fe³⁺ + Mn²⁺ + H₂O (B) Na₂Cr₂O₇ generally not used as a primary standard in volumetric analysis because it is deliquescent. (C) In acidic medium Cr₂O₇²⁻ exists and it get converted into CrO₄²⁻ in basic medium. 2CrO₄²⁻ + 2H⁺ ⇌ Cr₂O₇²⁻ + H₂O Cr₂O₇²⁻ + 2OH⁻ ⇌ 2CrO₄²⁻ + H₂O (D) K₂Cr₂O₇ is a good oxidising agent and bond angle of Cr-O-Cr bond in Cr₂O₇²⁻ is 126° [Figure: Dichromate ion structure]

Answer

A, B and C only

Answer

A, C and D only

Answer

A and C only

Answer

B and D only

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