AJC_H1_CHEM_P1_QP

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2 AJC JC2 PRELIM 2015 8872/01/H1 Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 The relative isotopic mass values and percentage abundances of the isotopes of a sample of neon are shown in the table. relative isotopic mass % abundance 20 90.92 21 0.26 22 8.82 Based on these figures, what is the relative atomic mass of neon to two decimal places? A 20.16 B 20.17 C 20.18 D 20.20 2 Group I and Group II ionic hydrides react with water. H –(s) + H2O(l) OH–(aq) + H2(g) In an experiment, 1 g samples of each of the following ionic hydrides are treated with an excess of water. Which sample produces the greatest mass of hydrogen? A LiH B NaH C CaH 2 D MgH2 3 The equations for three reactions are given below. C l 2 + 2I– 2Cl– + I2 2Fe 3+ + 2I– 2Fe2+ + I2 C l2 + 2Fe2+ 2Cl– + 2Fe3+ What is the correct order of strength of Cl–, Fe2+ and I– as reducing agents? weakest strongest A Cl– Fe2+ I– B Cl– I– Fe2+ C Fe2+ Cl– I– D I– Cl– Fe 2+

3 AJC JC2 PRELIM 2015 8872/01/H1 [Turn over 4 In which pair do both atoms, in their ground states, have the same number of unpaired electron? A B, Ca B F, Na C Ne, P D Be, Si 5 Penicillins are important antibacterial agents. The active penicillins are derivatives of the compound below. CH CH NC O H2NS C CH3 CH3 CH CO2H How many lone pairs of electrons are present in this molecule? A 2 B 4 C 8 D 10 6 Water, methanol and methoxymethane, CH3OCH3, have similarly shaped molecules. O HH O HH3C O H3CC H 3 What is the strongest intermolecular force in water, methanol and