A student investigates solution W and solid X.

1. (a)(i)Solution W is green in colour and contains Fe²⁺ ions. Describe how W can be shown to contain Fe²⁺ ions.[2]
2. (a)(ii)Excess W is added to acidified aqueous potassium manganate(VII). Describe the colour change seen. from .............................................................. to ..............................................................[2]
3. (a)(iii)Describe the observations made when a few drops of aqueous ammonia and then an excess of aqueous ammonia are added to the mixture from (ii). a few drops .................................................................................................................... an excess .....................................................................................................................[2]
4. (b)(i)Solid X is a shiny grey metal. The tests the student does on X are shown in Table 3.1. Some of the observations for these tests are also shown. [Table 3.1: tests on solid X and observations] Predict the identity of the gas produced in test 1. Describe how the student tests the gas to confirm its identity. gas .............................................................................................................................. test .............................................................................................................................. observation to confirm gas ............................................................................................[3]
5. (b)(ii)The observations for test 1 are incomplete. State one other observation that the student makes for test 1.[1]
6. (b)(iii)State the conclusion you can make from test 2.[1]
7. (b)(iv)State the conclusion you can make from test 3.[1]
8. (b)(v)Identify the acid used in test 1.[1]
9. (b)(vi)Suggest the identity of metal X.[1]