Assertion (A): Mercury(II) chloride does not give the chromyl chloride test. Reason (R): HgCl2 is largely covalent and furnishes very few free chloride ions in conc. H2SO4.

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the correct explanation of A

JEE Main levelSingle correct optionDifficulty 2 of 3qa210

Assertion (A): Mercury(II) chloride does not give the chromyl chloride test. Reason (R): $HgCl X_{2}$ is largely covalent and furnishes very few free chloride ions in conc. $H X_{2} SO X_{4}$ .

The test needs ionic chloride to react with dichromate and conc.

H X_{2} SO X_{4}

to form

CrO X_{2} Cl X_{2}

. Mercury(II) chloride is covalent and poorly ionised, so no chromyl chloride vapour is produced. Hence A is true and R correctly explains it.