JEE Main 2024 Chemistry question

Chemistry The d and f-Block Elements JEE Main 2024

A and B formed in the following reaction are : CrO₂Cl₂ + 4NaOH → A + 2NaCl + 2H₂O, A + 2HCl + 2H₂O₂ → B + 3H₂O

(A)A = Na₂Cr₂O₇, B = CrO₃
(B)A = Na₂CrO₄, B = CrO₅Correct
(C)A = Na₂CrO₄, B = CrO₄
(D)A = Na₂Cr₂O₇, B = CrO₅

Answer: (B)

Solution

CrO₂Cl₂ + 4NaOH → Na₂CrO₄ (A) + 2NaCl + 2H₂O. Acidified sodium chromate with H₂O₂ gives the blue peroxide CrO₅ (B).

Question ID VK-016965