Answer all the questions in the spaces provided.

1. (a)(i)State how the solubilities of the hydroxides of the Group 2 elements vary down the group.[1]
2. (a)(ii)Explain the factors that are responsible for this variation.[3]
3. (b)(i)The solubility of Sr(OH)2 is 3.37 × 10-2 mol dm⁻³ at 0°C. Write an expression for the solubility product of Sr(OH)2. Ksp =[1]
4. (b)(ii)Calculate the value of Ksp at 0°C. Include units in your answer. Ksp = units =[2]
5. (c)(i)Metal peroxides contain the ¯O–O– ion. The peroxides of the Group 2 elements, MO₂, decompose on heating to produce a single gas and the solid oxide, MO, only. Write an equation for the thermal decomposition of strontium peroxide, SrO2.[1]
6. (c)(ii)Suggest how the temperature at which thermal decomposition of MO2 occurs varies down Group 2. Explain your answer.[3]
7. (d)(i)The ethanedioates of the Group 2 elements, MC2O4, decompose on heating to produce a mixture of two different gases and the solid oxide, MO, only. Complete the equation for the thermal decomposition of barium ethanedioate. BaC2O4 →[1]
8. (d)(ii)Describe two observations you would make during the reaction when ethanedioic acid, H2C2O4, is warmed with acidified manganate(VII) ions.[2]