JEE Main 2026 · 4 Apr · Shift 1 · Chemistry Q61

ChemistrySingle correct+4 / -1Question 61 of 75

Correct statements from the following are

A. Potassium dichromate is an oxidising agent and it oxidises $\ce{FeSO4}$ to $\ce{Fe2(SO4)3}$ in acidic medium.

B. Sodium dichromate can be used as primary standard in volumetric estimation.

C. $\ce{CrO4^{2-}}$ and $\ce{Cr2O7^{2-}}$ are interconvertible in aqueous solution by varying the pH of the solution.

D. Cr-O-Cr bond angle in $\ce{Cr2O7^{2-}}$ is 126°.

Choose the correct answer from the options given below:

A, B and C Only

A, C and D Only

A and C Only

B and D Only

Answer and worked solution

Official answer: B

A ✓: $\ce{Cr2O7^{2-} + 14H+ + 6Fe^{2+} -> 2Cr^{3+} + 6Fe^{3+} + 7H2O}$ .
B ✗: sodium dichromate is hygroscopic; potassium dichromate is the primary standard.
C ✓: $\ce{2CrO4^{2-} + 2H+ <=> Cr2O7^{2-} + H2O}$ .
D ✓: the Cr-O-Cr angle in dichromate is about 126°.

(B)

Topics:Important compounds (KMnO4, K2Cr2O7)

JEE Main 2026 · 4 Apr · Shift 1, Chemistry question 61