Identify the unknown species and complete the following
(i)`(A)+BaCl_(2) to` White precipitate
(ii)`NaOH+(B)to NH_(3)` gas
(iii)`( C)+MnO_(2)+H_(2)SO_(4) to` Violet vapours
(iv)`(D)+K_(2)Cr_(2)O_(7)+H_(2)SO_(4) to` Green coloured solution
(vi)`undersetunderset("solid")("Colourless")(E)overset("Heat")to` Yellow copound

Explanation

(i)Sulphate, (ii) ammonium salt, (iii)iodide , (iv)reducing agent such as sulphite, `SO_(2)`, sulphide, `H_(2)S`, nitrite, etc, (e)`ZnO`.