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.

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

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

A mixture of K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) forms

What happens when NaCl is heated with K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) ?