OCR A LEVEL CHEMISTRY A PAPER 1 _JUNE 2022 QUESTION PAPER Guaranteed A

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OCR A LEVEL CHEMISTRY A PAPER 1 _JUNE 2022 QUESTION PAPER You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. Answer all the questio... ns. 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. Which 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) Your answer [1] © OCR 2022 3 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 Your answer [Show More]

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