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

1. A = Na2Cr2O7, B = CrO3
2. A = Na2Cr2O7, B = CrO5
3. A = Na2CrO4, B = CrO4
4. A = Na2CrO4, B = CrO5

Correct answer: A = Na2CrO4, B = CrO5

Solution

The correct option identifies A as sodium chromate (Na2CrO4), which is formed from the reaction of CrO2Cl2 with sodium hydroxide, and B as chromium pentoxide (CrO5), which is produced when sodium chromate reacts with hydrochloric acid and hydrogen peroxide.

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