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JEE Main levelSingle correct optionDifficulty 2 of 3qa042

Solid $K X_{2} Cr X_{2} O X_{7}$ and conc. $H X_{2} SO X_{4}$ are heated with each of the following chlorides. Among the following, which one gives the red-orange vapours of chromyl chloride?

A $AgCl$
B $HgCl X_{2}$
C $SnCl X_{4}$
D $NaCl$

Answer: D

The chromyl chloride test needs ionic, soluble chloride that releases free

Cl X^{-}

with conc. acid.

HgCl X_{2}

and

SnCl X_{4}

are covalent and AgCl is very insoluble, so these give no

CrO X_{2} Cl X_{2}

. NaCl does.

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