Edexcel Jun 2017 Paper 2 Q11

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11 Anhydrous calcium nitrate decomposes on heating. (a) This action of heat produces a white solid and A only a brown gas. B only a gas that relights a glowing splint. C both a brown gas and a gas that relights a glowing splint. D only a colourless, inert gas. (b) Decomposition occurs quite easily because of the A polarisation of the calcium ion by the nitrate ion. B polarisation of the nitrate ion by the calcium ion. C distortion of the calcium electron cloud by the nitrate ion. D repulsion of the nitrate electron cloud by the calcium ion. (1) (1) 12 Given the following boiling temperatures, select the likely boiling temperature for hydrogen fluoride, HF. (Total for Question 11 = 2 marks) Hydrogen halide Boiling temperature / K HCl HBr HI 188 206 238 A 156 K B 172 K C 184 K D 293 K (Total for Question 12 = 1 mark) *P53493A0620* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

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