When an organge crystalline compound (A) was heated with common salt and concentrated sulphuric acid, an orange red gas (B) was evolved. Acidified solution of the comound (A) reacts with `H_(2)O_(2)` to produce a deep blue solution due to the formation of comopund (C ). The gas (B) on passing through NaOh solution gave a solution (D). The solution on reacting with an aqueous solution of lead acetate gave a yellow precipitate of (E).
Name the compounds A,B,C,D ( present in the soluiotn ) and E ( present as ppt.)

Explanation

`underset("Potassium dichromate")underset((A)) (K_(2)Cr_(2)O_(7)) + 4NaCl + 6H_(2)SO_(4) rarr 2KHSO_(4) + 4NaHSO_(4) + underset( "Chromyl chloride")underset((B)) ( 2CrO_(2)Cl_(2))+3H_(2)O`
`K_(2)Cr_(2)O_(7) + H_(2)SO_(4) + 4H_(2)O_(2) rarr underset("Peroxo compound, " CrO(O_(2))_(2)) underset((B)) (2CrO_(5))+ K_(2)SO_(4) + 5H_(2)O`
`underset((B))(CrO_(2)Cl_(2)) +4NaOH rarr underset("Sodium chromate")underset((D)) (Na_(2)CrO_(4)) + 2NaCl+ 2H_(2)O`
`Na_(2) CrO_(4) + ( CH_(3) COO)_(2)Pb rarr underset("Lead chromate ( Yellow ppt.)")underset((E )) (PbCrO_(4)) + 2CH_(3) COONa`