AS Level Chemistry A H032/01 Breadth in chemistry Sample Question Paper

How many electrons are in a 12Mg 24 2+ ion? A 10 B 12 C 14 D 22 Your answer [1] 2 What is the formula of chromium(III) sulfate? A Cr3SO4 B Cr(SO4)3 C Cr2(SO4)3 D Cr3SO3 Your answer [1] 3 Which molecule is n ...

How many electrons are in a 12Mg 24 2+ ion? A 10 B 12 C 14 D 22 Your answer [1] 2 What is the formula of chromium(III) sulfate? A Cr3SO4 B Cr(SO4)3 C Cr2(SO4)3 D Cr3SO3 Your answer [1] 3 Which molecule is non-polar? A SF6 B H2S C PF3 D NH3 Your answer [1] 3 © OCR 2021 H032/01 Turn over 4 Which row is correct? Highest pH when added to water Most reactive halogen A MgO F2 B MgO I2 C BaO F2 D BaO I2 Your answer [1] 5 Which equation represents a redox reaction? A Mg + 2HCl → MgCl2 + H2 B MgO + 2HCl → H2O + MgCl2 C MgCO3+ 2HCl → CO2 + H2O + MgCl2 D Mg(OH)2 + 2HCl → MgCl2 + 2H2O Your answer [1] 6 This question is about trends in the periodic table. Which trend is correct? A melting point decreases from lithium to carbon B boiling point decreases from fluorine to iodine C first ionisation energy decreases from lithium to caesium D first ionisation energy increases from nitrogen to oxygen Your answer [1] 4 © OCR 2021 H032/01 7 A sample of a compound M contains 1.46 g of carbon, 0.482 g of hydrogen and 1.69 g of nitrogen. What is the empirical formula of M? A CH2N B C4HN4 C CH4N D C2H4N Your answer [1] 8 A student mixes 100 cm3 of 0.200 mol dm–3 NaCl(aq) with 100 cm3 of 0.200 mol dm–3 Na2CO3(aq). What is the total concentration of Na+ ions in the mixture formed? A 0.100 mol dm–3 B 0.200 mol dm–3 C 0.300 mol dm–3 D 0.400 mol dm–3 Your answer [1] 9 Which mass of substance contains the greatest number of atoms? A 3.00 g of ammonia, NH3 B 3.00 g of chloromethane, CHCl3 C 4.00 g of hydrogen sulfide, H2S D 4.00 g of hydrogen chloride, HCl Your answer [1] 5 © OCR 2021 H032/01 Turn over 10 Which reagent would exactly neutralise 100 cm3 of 1.00 mol dm–3 H2SO4(aq)? A 0.100 mol Al(OH)3 B 0.100 mol NH3 C 0.100 mol Ba(OH)2 D 0.100 mol NaOH Your answer [1] 11 The table below shows standard enthalpy changes of formation, ∆fH. Compound NH4NO3(s) H2O(g) CO2(g) ∆fH / kJ mol–1 –366 –242 –394 What is the enthalpy change for the following reaction? 2NH4NO3(s) + C(s) → 2N2 (g) + 4H2O(g) + CO2(g) A –630 kJ mol–1 B –540 kJ mol–1 C +540 kJ mol–1 D +630 kJ mol