（a）（i）Transfer a 2 cm depth of FA 2， $$\(\mathrm{KMnO}_{4}\)$$ ，into a test－tube．Add the same volume of aqueous sodium hydroxide followed by a small spatula measure of $$\(\mathbf{F A 5}, \mathrm{MnO}_{2}\)$$ ．Stir for approximately 30 seconds then filter the mixture into a second test－tube． observations . Add dilute sulfuric acid to the filtrate until no further change． observations . ［2］ （ii）Transfer a 1 cm depth of aqueous iron（II）sulfate into a boiling tube．Add the same depth of dilute sulfuric acid followed by a very small spatula measure of $$\(\mathbf{F A 5}, \mathrm{MnO}_{2}\)$$ ．Carefully warm the mixture using a Bunsen burner for about 20 seconds．Filter the warm mixture into a test－tube． observations . Add aqueous sodium hydroxide dropwise to the filtrate until no further change． observations . ［2］ (iii) Suggest a conclusion about the chemical behaviour of FA 5 using your observations in (a)(ii). FA 5 is acting as ...................................................................................................... (iv) Write an ionic equation for the reaction between aqueous sodium hydroxide and the filtrate in (a)(ii). Include state symbols. .................................................................................................................................

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