A white substance a reacts with dilute H_(2)SO_(4) to produce a colourless gas B and a colourless solution C. The reaction between B and acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly coloured precipitate D. The substance D burns in air to produce a gas E which reacts with B to yield D and a colourless liquid. Anhydrous copper sulphate is turned blue on addition of this colourless liquid. Additio of aqueous NH_(3) or NaOH to C produces first a precipitate, produce a clear solution in each case. Identify A, B, C, D and E. Write the equations of the reactions involved.

A white substance a reacts with dilute H_(2)SO_(4) to produce a colour

1.	A white substance a reacts with dilute H_(2)SO_(4) to produce a colourless gas B and a colourless solution C. The reaction between B and acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly coloured precipitate D. The substance D burns in air to produce a gas E which reacts with B to yield D and a colourless liquid. Anhydrous copper sulphate is turned blue on addition of this colourless liquid. Additio of aqueous NH_(3) or NaOH to C produces first a precipitate, produce a clear solution in each case. Identify A, B, C, D and E. Write the equations of the reactions involved.
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