Edexcel Jan 2017 (IAL) Paper 1 Q14

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13 The following statements give information about the thermodynamic stability of magnesium chlorides. (cid:404) MgCl is stable with respect to chlorine and magnesium. (cid:404) MgCl is unstable with respect to MgCl2 and Mg. (cid:404) MgCl3 is unstable with respect to chlorine and magnesium. Which signs of the standard enthalpy changes of formation of MgCl and MgCl3 are correct? (cid:507)H f (cid:57) [MgCl(s)] negative positive negative positive (cid:507)H f (cid:57) [MgCl3(s)] negative negative positive positive 14 In the electrolysis of copper(II) chromate(VI) solution, the colour that develops around the positive electrode (anode) is (Total for Question 13 = 1 mark) A orange. B yellow. C green. D blue. 15 When 10 cm3 of a nitric acid solution reacts with 20 cm3 of a sodium hydroxide solution, the temperature rise is (cid:507)T. (Total for Question 14 = 1 mark) Repeating the reaction with 15 cm3 of the same nitric acid solution and 30 cm3 of the same sodium hydroxide solution would give a temperature rise of A 0.5 (cid:507)T B 0.67 (cid:507)T C (cid:507)T D 1.5 (cid:507)T (Total for Question 15 = 1 mark) *P48367A0624* 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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