A small amount of each of the following solids is heated with K2Cr2O7 and concentrated H2SO4. Which gives orange-red chromyl chloride vapours?

JEE Main levelSingle correct optionDifficulty 2 of 3qa151

A small amount of each of the following solids is heated with $K X_{2} Cr X_{2} O X_{7}$ and concentrated $H X_{2} SO X_{4}$ . Which gives orange-red chromyl chloride vapours?

Ionic

NaCl

supplies chloride and gives

CrO X_{2} Cl X_{2}

. Covalent

HgCl X_{2}

gives no free chloride, and chlorides of silver and lead do not give the test either.