4 2 Barium ions can be identified by their flame colour. (a) Which of the following should be used for a flame test on barium carbonate? (1) A iron wire and water B iron wire and concentrated hydrochloric acid C nichrome wire and water D nichrome wire and concentrated hydrochloric acid (b) What colour do barium ions give in a flame test? (1) A green B lilac C red D yellow (c) A flame test was carried out on a mixture of barium chloride and magnesium chloride. How does the presence of magnesium ions affect the appearance of the flame colour of barium ions? (1) A the colour is more intense B a bright white colour completely masks the barium colour C there is no change D the barium colour is decreased by the white magnesium flame colour (Total for Question 2 = 3 marks)