JEE Advanced Chemistry question

In which case(s) there is change in oxidation number

(A)Aqueous solution of is acidified
(B) gas is passed into Correct
(C) solution is made alkaline
(D) is dissolved in NaOH

Answer: (B)

Solution

Acidifying chromate (a) and making dichromate alkaline (c) are simply the reversible chromate-dichromate equilibrium shift; Cr stays at +6 throughout both. Dissolving in NaOH (d) is a hydrolysis reaction giving and , again with Cr

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Question ID VK-159719