Salt ' X ' when heated with K 2 Cr 2 O 7 and conc. H 2 SO 4 . No chromate is present in the distillate. Salt ' X ' can be :-

Question

Salt ' X ' when heated with K 2 ​ Cr 2 ​ O 7 ​ and conc. H 2 ​ SO 4 ​ . No chromate is present in the distillate. Salt ' X ' can be :-

TestHub · Accepted Answer

In the chromyl chloride test, chlorides (Cl⁻) form red fumes of chromyl chloride CrO₂Cl₂ when heated with K₂Cr₂O₇ and conc. H₂SO₄.

Since no chromyl chloride is formed in the distillate, chloride ions are absent.

Among the given options, only NaI contains iodide (I⁻), which does not give this test.

Therefore, salt X must be NaI.

$K_{2} C r_{2} O_{7} + 4 C l^{-} + 6 H^{+} \to C r O_{2} C l_{2} + \dots$

Correct Answer: (C) NaI

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