Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

JEE Main 202126 FebruaryMorning Shift

Exam: JEE Main
Year: 2021
Date: 26 February
Shift: Morning Shift
Subject: Chemistry
Chapter: Redox Reactions

JEE Main 2021 · 26 February · Morning Shift · Chemistry · Redox Reactions

Dichromate ion is treated with base, the oxidation number of Cr in...

Dichromate ion is treated with base, the oxidation number of

Cr

in the product formed is

Correct answer

6

Step-by-step solution

${Cr}_{2}{O}_{7}^{2 -} + {OH}^{-} ⟶ {CrO}_{4}^{2 -}$

Oxidation state of $Cr$ in ${CrO}_{4}^{2 -}$ is $+ 6$

Practice Redox Reactions on Quantrex Academy →

More from Redox Reactions

500 mL of 0.2 M MnO _4^- solution in basic medium when mixed with 500 mL of 1.5 M KI… JEE Main 2026 Given below are two statements: Statement I: Sodium dichromate and potassium dichromate… JEE Main 2026 In order to oxidise a mixture of 1 mole each of FeC_2O_4 , Fe_2(C_2O_4)_3 , FeSO_4 and… JEE Main 2026 500 mL of 1.2 M KI solution is mixed with 500 mL of 0.2 M KMnO_ 4 solution in basic… JEE Main 2026 One mole of Cl_ 2 (~g) was passed into 2 L of cold 2 M KOH solution. After the reaction… JEE Main 2026 X and Y are the number of electrons involved, respectively during the oxidation of I^… JEE Main 2026 200 cc of x × 10^ -3 M potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr's… JEE Main 2026 Identify the correct statements : A. Hydrated salts can be used as primary standard. B.… JEE Main 2026 Full Redox Reactions list All JEE Main PYQs