The reaction of NaCl and `K_2Cr_2O_7` with conc. `H_2SO_4` results in the formation of

The reaction of NaCl and K_(2)Cr_(2)O_(7) mixture with conc. H_(2)SO_(4) result in the formation of:

The reaction of NaCl and K_(2)Cr_(2)O_(7) mixture with conc. H_(2)SO_(4) result in the formation of:

The reaction of K_2 Cr_2 O_7 with NaCl and conc. H_2 SO_4 gives___________.

The reddish brown vapours formed when sodium chloride is heated with K_2Cr_2O_7 and conc. H_2SO_4 are due to the formation of ............... .

When mixture of NaCl and K_(2)Cr_(2)O_(7) is gently warmed with conc. H_(2)SO_(4) then compound X is formed. What is the oxidation state of central atom of X?