3 marksGroup VII Elements

CAPE Chemistry Unit 1 · 2009 · Paper 2 · Question 6(d)(i)

A simple salt, S, when treated with concentrated sulphuric acid produces dense white fumes, T, and a red-brown gas, U. T, on dissolving in water, produces a colourless solution which turns blue litmus paper red, and gives a cream precipitate, V, on addition of silver ions. V dissolves in aqueous ammonia.

Identify the substances, T, U and V.

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Other parts of this question

6(a)Define the term 'electronegativity'.[1 mark]
6(b)(i)Describe the structures of the chlorides.[2 marks]
6(b)(ii)Describe the differences in the pH of the solutions formed when the chlorides react with water.[2 marks]
6(b)(iii)Write the equation for the reaction of silicon(IV) chloride and water.[2 marks]
6(c)(i)What is meant by the term 'disproportionation'?[1 mark]
6(c)(ii)A suspension is formed when excess silver ions (Ag+) are added to Solution P. On filtering the suspension and heating the filtrate a white precipitate is…[2 marks]
6(d)(ii)Write the formula for the ion present in S.[1 mark]
6(d)(iii)Write the equation for the formation of the cream precipitate, V.[1 mark]

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