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6 marksSulfuric Acid

CAPE Chemistry Unit 2 · 2006 · Paper 2 · Question 6(b)(i)

A brown solid, J, heated with concentrated sulphuric acid reacts to give a white solid, K, and a colourless, odourless gas, L, which relights a glowing splint. J reacts with aqueous manganese(II) nitrate in the presence of dilute nitric acid to give a purple solution, M. When dilute hydrochloric acid is added to M, a white precipitate, O, forms in the purple solution; O dissolves when heated and reforms on cooling. Identify EACH of J to O, and state the nature of J.

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  1. 6(a)(i)Explain the trend in the bonding and acid/base character of the Group IV oxides in the +2 state.[6 marks]
  2. 6(a)(ii)Explain the trend in the behaviour of the Group IV tetrachlorides on reacting with water.[2 marks]
  3. 6(b)(ii)When acidified potassium chromate(VI) is added to an aqueous chloride, P, it changes from orange to green. P can also be used to change nitrobenzene (C₆H₅NO₂)…[4 marks]
  4. 6(b)(iii)Suggest what would be observed when aqueous P reacts with aqueous iron(III) chloride. Explain your answer.[2 marks]

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