A white solid A reacts with dilute H2SO4 to produce a colourless gas B and a colourless solution C. The reaction between B and acidified dichromate yields a green solution and a slightly coloured precipitate D. The substance D, when burnt in air, gives a gas E which reacts with B to yield D and a colourless liquid. Anhydrous copper sulphate turns blue with this colourless liquid. The addition of aqueous NH3 or NaOH to C produces a precipitate that dissolves in an excess of the reagent to form a clear solution.
What would appear if the gas B were passed through an aqueous solution of Pb(NO3)2 ?
(1) A white precipitate soluble in hot dilute HNO3
(2) A black precipitate soluble in hot dilute HNO3
(3) A black precipitate insoluble in hot dilute HNO3
(4) A yellow precipitate soluble in hot concentrated HNO3