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A mixture of NaCl and K2Cr2O7 is warmed gently with concentrated H2SO4, producing compound X. What is the oxidation state of the central atom in X?

1. +3
2. +4
3. +6
4. +7

Correct answer: +6

Solution

The reaction gives chromyl chloride CrO2Cl2; in it chromium is +6 (the same oxidation state it has in dichromate, so no redox change occurs).

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