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  4. Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of :

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Q. Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of :

JEE MainJEE Main 2013The d-and f-Block Elements

Solution:

Solid potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride gives orange red vapours of a volatile oily liquid $CrO_2Cl_2$
$K_{2}Cr_{2}O_{7}+4NaCl+6H_{2}SO_{4}\,\to 2KHSO_{4}+4NaHSO_{4}+2CrO_{2}Cl_{2}$
chromyl chloride