On heating a mixture of common salt and 
in equal amount along with concentrated 
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:
and +3
and +5 
and +6
and +6
Text Solution
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When a mixture of NaCl and K 2 Cr 2 O 7 is heated with concentrated H 2 SO 4 , the dichromate ion oxidizes chloride ions. The reaction produces chromyl chloride (CrO 2 Cl), which is a volatile deep-red colored gas. The dichromate ion contains chromium in the +6 oxidation state. In the reaction, the dichromate is reduced and chloride is oxidized, but the chromium in the product remains in the +6 oxidation state as CrO 2 Cl (or as CrO 2+ in ionic form). The gas evolved is CrO 2 Cl with chromium in the +6 oxidation state
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