On heating a mixture of common salt and K2Cr2O7 in equal amount along with concentrated H2SO4 in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom

Question

On heating a mixture of common salt and K2Cr2O7 in equal amount along with concentrated H2SO4 in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are :

(A) CrO2Cl2 and +5
(B) CrO2Cl2 and +6
(C) Cr2O2Cl2 and +6
(D) Cr2O2Cl2 and +3

Prashant Kotian · Accepted Answer

Correct answer: B. 4NaCl + K2Cr2O7 + 6H2SO4  2KHSO4 + 2CrO2Cl2 + 4NaHSO4 + 3H2O (Chromyl chloride) In Chromyl chloride Cr is in +6 oxidation state. SECTION-B

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