(C) In a basic medium,the dichromate ion $(Cr_2O_7^{2-})$ is converted into the chromate ion $(CrO_4^{2-})$.The chemical reaction is as follows:$K_2Cr

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Conversion of dichromate ion to chromate ion.

(C) In a basic medium,the dichromate ion $(Cr_2O_7^{2-})$ is converted into the chromate ion $(CrO_4^{2-})$.The chemical reaction is as follows:$K_2Cr_2O_7 + 2KOH \rightleftharpoons 2K_2CrO_4 + H_2O$The formation of potassium chromate $(K_2CrO_4)$,which is lemon yellow in color,causes the color change.

Class 12 Chemistry d-and f-Block Elements Compounds of Transitional elements

Difficult

The orange-red color of an aqueous solution of $K_2Cr_2O_7$ changes to lemon yellow when treated with aqueous $KOH$. What is the reason for this?

A
Reduction of $Cr(VI)$ to $Cr(III)$.
B
Conversion of chromium ion to chromate ion.
C
Conversion of dichromate ion to chromate ion.
D
Oxidation of potassium hydroxide to potassium peroxide.

Explore More

Browse All

Question Bank

All Subjects

Class 12 Questions

Class 12

Chemistry Questions

Chapter

d-and f-Block Elements

Subtopic

Compounds of Transitional elements

The alloy that contains copper and $Zn$ is $x$ and the one that contains copper and $Ni$ is $y$. What are $x$ and $y$ respectively?

EasyAP EAMCET 2025

View Solution

$FeSO_4 \cdot 7H_2O$ (Green Vitriol) salt on thermal decomposition does not produce

Medium

View Solution

In which compound does chromium have a $+6$ oxidation state?

Easy

View Solution

Assertion: $KMnO_4$ is purple in colour due to charge transfer.
Reason: There is no electron present in $d$-orbitals of Manganese in $MnO_4^-$.

Medium

View Solution

Write a note on halide compounds of transition elements.

Difficult

View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial

For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free

For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo

The orange-red color of an aqueous solution of $K_2Cr_2O_7$ changes to lemon yellow when treated with aqueous $KOH$. What is the reason for this?

Similar Questions

The alloy that contains copper and $Zn$ is $x$ and the one that contains copper and $Ni$ is $y$. What are $x$ and $y$ respectively?

$FeSO_4 \cdot 7H_2O$ (Green Vitriol) salt on thermal decomposition does not produce

In which compound does chromium have a $+6$ oxidation state?

Assertion: $KMnO_4$ is purple in colour due to charge transfer.Reason: There is no electron present in $d$-orbitals of Manganese in $MnO_4^-$.

Write a note on halide compounds of transition elements.

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion: $KMnO_4$ is purple in colour due to charge transfer.
Reason: There is no electron present in $d$-orbitals of Manganese in $MnO_4^-$.