Question Detail

CHM 101 CHM 101 Past Questions Objective Question
Take CBT

Question

Which statement is true for the reaction: (Image likely shows Cr₂O₇²⁻ with HSO₃⁻)
Options
A Cr₂O₇²⁻ is the reducing agent
B HSO₃⁻ acts as the oxidizing agent
C Oxidation of HSO₃⁻ occurs to give HSO₄⁻
Correct Answer
D Oxidation of Cr₂O₇²⁻ occurs to give Cr³⁺
Correct Answer

Option C is the correct answer.

Detailed Explanation

In the reaction between dichromate and bisulfite, Cr₂O₇²⁻ (Cr in +6) is reduced to Cr³⁺, and HSO₃⁻ (S in +4) is oxidized to HSO₄⁻ (S in +6). Thus, HSO₃⁻ is the reducing agent and is oxidized.

Hint

Identify changes in oxidation states. Cr₂O₇²⁻ is a common oxidizing agent.

Question Info

Course: CHM 101
Topic: CHM 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1161 of 1872
Previous Course Details Next