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NEET levelSingle correct optionDifficulty 1 of 3qa077

Orange-red chromyl chloride vapours are absorbed in aqueous NaOH. The colour of the solution formed is

Ayellow, due to $CrO X_{4} X^{2 -}$
Borange, due to $Cr X_{2} O X_{7} X^{2 -}$
Cgreen, due to $Cr X^{3 +}$
Dcolourless

Answer: A

CrO X_{2} Cl X_{2} + 4 NaOH Na X_{2} CrO X_{4} + 2 NaCl + 2 H X_{2} O

. In alkaline medium chromium(VI) exists as yellow chromate, which gives yellow

PbCrO X_{4}

with lead acetate.

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