ACJC 2022 Prelim P1 QP

3 © ACJC 2022 9729/01/Prelim/2022 [Turn over 1 Which species deflects the most in an electric field? A 7Li+ B 24Mg2+ C 32S2− D 27Al3+ 2 The shape of each p-orbital is represented as two lobes. How many 3d orbitals have four lobes? A 2 B 3 C 4 D 5 3 Which species has the greatest number of unpaired electrons in its ground state? A Cu+ B CH3− C Mg D F 4 Which species contains a dative bond? 1 CO 2 NO3− 3 O3 A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 only

4 © ACJC 2022 9729/01/Prelim/2022 [Turn over 5 Which row correctly describes the shape and polarity of the species? species shape polarity A AlCl3 trigonal planar polar B SiF4 square planar non-polar C BrF3 trigonal pyramidal polar D BeCl2 linear non-polar 6 Which graph shows the behaviour of a fixed mass of an ideal gas at a constant temperature? A B C D 7 Which statements explain the difference in ionic radius between Na+ and F−? 1 Outermost electrons of F− experience weaker nuclear charge than those of Na+. 2 Outermost electrons of Na+ experience greater shielding effect than those of F−. 3 Outermost electrons of Na+ are nearer to the nucleus than those of F−. A 3 only B 1 and 2 only C 1 and 3 only D 1, 2 and 3 p ρ pV p pMr V p

5 © ACJC 2022 9729/01/Prelim/2022 [Turn over 8 0.1 mol of compound X dissolves in 1 dm3 of water to give a solution with a pH of 1. What is the identity of X? A AlCl3 B CH3COCl C NH4NO3 D CH3COOH 9 Wüstite, containing both Fe 2+ and Fe3+ ions, has the formula Fe 20Ox. Fe2+ constitutes 90% of the iron ions present in the compound. What is the value of x? A 18 B 19 C 21 D 22 10 Which option involves a positive entropy change? A the homolytic fission of gaseous chlorine B the lattice energy of sodium chloride C the contraction of an ideal gas at a constant temperature D cooling a copper strip from 373 K to 273 K

6 © ACJC 2022 9729/01/Prelim/2022 [Turn over 11 The reaction between NO and Br2 is proposed to proceed via the following mechanism: step 1: NO + Br2 NOBr2 (fast) step 2: NOBr2 + NO 2NOBr (slow) Which statements are correct? 1 NOBr2 is a radical. 2 The rate equation for this reaction is rate = k[Br2][NO]2. 3 NOBr2 is a transition state. A 1 and 2 only B 1, 2 and 3 C 1 and 3 only D 2 and 3 only 12 Which statement regarding catalysts is correct? A Catalysts cha