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OCR A LEVEL JUNE 2022 CHEMISTRY A PAPER 1,PAPER 2 AND PAPER 3 QUESTION PAPER

1 An aqueous solution contains a mixture of chloride, bromide and iodide ions. AgNO3(aq) is added to this mixture, followed by an excess of dilute NH3(aq). The resulting mixture is then filtered. Whi... ch compound(s) is/are present in the residue on the filter paper? A AgCl only B AgCl and AgBr C AgBr only D AgBr and AgI Your answer [1] 2 20 cm3 of nitrogen gas reacts with 10 cm3 of oxygen gas to form 20 cm3 of a gaseous product. Which equation is the most likely for the reaction? A N2(g) + O2(g) 2NO(g) B N2(g) + 2O2(g) N2O4(g) C 2N2(g) + O2(g) 2N2O(g) D 2N2(g) + 2O2(g) 4NO(g) 3 0.541 g of an element X is reacted with oxygen to form 0.790 g of the oxide X2O3. What is the element X? A Al B Cr C Ga D Sc Your answer [1] 4 Hydrogen peroxide, H2O2, can be oxidised by manganate(VII) ions under acid conditions as shown below. 2MnO –(aq) + 5H O (aq) + 6H+(aq) 2Mn2+(aq) + 5O (g) + 8H O(l) In a titration, 25.00 cm3 of a disinfectant containing hydrogen peroxide reacts with 22.00 cm3 of 0.125 mol dm–3 KMnO4(aq). What is the concentration of H2O2, in mol dm–3, in the disinfectant? Assume that KMnO4 only reacts with H2O2 in the disinfectant. A 0.0440 B 0.110 C 0.275 D 0.550 1 Which statement is correct for the different rates of hydrolysis of RCl and RBr? A RBr is hydrolysed faster because Cl is more electronegative than Br. B RBr is hydrolysed faster because the C–Cl bond enthalpy is greater than C–Br. C RCl is hydrolysed faster because Cl is more electronegative than Br. D RCl is hydrolysed faster because the C–Br bond enthalpy is greater than C–Cl. Your answer [1] 2 Which statement about absorption of radiation is correct? A Infrared radiation can result in the breakdown of the ozone layer. B Ultraviolet radiation can cause some polymers to photodegrade to benefit the environment. C Ultraviolet radiation is linked to global warming. D Ultraviolet radiation is used in modern breathalysers to measure ethanol in the breath. Your answer [1] 3 What is the number of sigma bonds in a molecule of methylbenzene? A 7 B 10 C 12 4 The skeletal formula of an organic compound is shown below. N OH O Which functional groups are present? A amide and alcohol B amide and carboxylic acid C amine and carboxylic acid D amine, ketone and alcohol 1 These questions are from different areas of chemistry. (a) Ammonia, NH3, and ammonium nitrate, NH4NO3, are compounds of nitrogen. (i) The boiling point of NH3 is –33 °C. The boiling point of NH4NO3 is 210 °C. Explain why there is a large difference in boiling points (ii) Two students discuss the oxidation numbers in ammonium nitrate, NH4NO3. One student claims that the two nitrogen atoms have the same oxidation number. The other student disagrees and claims that the nitrogen atoms have different oxidation numbers. Explain with reasons which student is correct. (b) Brass is an alloy of copper and zinc. The mass spectrum of a sample of brass is shown below. Relative abundance 60 61 62 63 64 65 m/z 66 67 68 69 70 The peaks at m/z = 63 and m/z = 65 are from the 63Cu and 65Cu isotopes of copper. The remaining four peaks are from isotopes of zinc. (i) What are the percentage compositions of copper and zinc in the brass sample? [Show More]

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