A white substance A reacts with dilute H2SO4 to produce a colourless gas B and a colourless solu....

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Colourless (2018)
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A white substance A reacts with dilute H2SO4 to produce a colourless gas B and a colourless solution C. The reaction between B and acidified K2Cr2O7 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 in addition to this colourless liquid. Addition of aqueous NH3 or NaOH to C produces first a precipitate, which dissolves in the excess of the respective reagent to produce a clear solution in each case. Identify A, B, C, D and E. Write the equations of the reactions involved. 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live



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