A white solid A reacts with dilute to produce a colourless gas B and a colourless…
CHEMISTRY · Single correct · GCSE · Chemistry · Chemical Analysis · Chemical Analysis
Problem
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.
Which of the following gases are B and E respectively?
(1) CO2 and SO2
(2) SO2 and H2S
(3) H2S and SO2
(4) CO2 and H2S