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Which of the following salt on heating w...

Which of the following salt on heating with solid `K_(2)Cr_(2)O_(7)` and Conc. `H_(2)SO_(4)` , orange red vapours are evolved which turn NaOH solution yellow.

A

`NaBr`

B

NaCI

C

`NaNO_(2)`

D

NaI

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Which of the following on heating with K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) with organge red color vapours ?

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Which of the following salt on heating with concentrated H_(2)SO_(4) , coloured vapours do not evolve?

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