Which of the following chlorides, when heated with solid K2Cr2O7 and concentrated H2SO4, does NOT give red vapours of chromyl chloride?

JEE Main levelSingle correct optionDifficulty 2 of 3qa079

Which of the following chlorides, when heated with solid $K X_{2} Cr X_{2} O X_{7}$ and concentrated $H X_{2} SO X_{4}$ , does NOT give red vapours of chromyl chloride?

The chromyl chloride test needs ionic chloride that supplies free

Cl X^{-}

NaCl

KCl

and

CaCl X_{2}

are ionic and respond, whereas

HgCl X_{2}

is covalent and does not.