IJC 2015_H1_CHEM_P1_QP Prelims

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2  IJC 2015 Prelim 1/8872/01 [Turn over Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 An exciting chemical demonstration is the ‘barking dog’. An equation which describes the reaction is shown. 6NO + 2CS2 3N 2 + 2CO + 2SO2 + 1 4 S8 Carbon disulfide, CS2, is a liquid with a density of 1.26 g cm3. Which mass of sulfur would be formed from 5.00 cm 3 of CS2 if the reaction proceeded with 80% yield? [Mr of CS2 = 76.2; S8 = 256.8] A 1.67 g B 2.12 g C 2.65 g D 3.32 g 2 The following half-reactions occur when potassium iodate( V), K IO3 in hydrochloric acid solution oxidises iodine to ICl2 . IO3  + 2Cl + 6H+ + 4e ICl2  + 3H2O I2 + 4Cl 2ICl2  + 2e What is the ratio of IO3  to I2 in the balanced chemical equation for the overall reaction? A 1: 1 B 1: 2 C 1:4 D 2 :1 3 Use of the Data Booklet is relevant to this question. In which pairs do both species have different number of unpaired electrons? A O and C l+ B F+ and Ga C P and Ne+ D Ga+ and Ne

3  IJC 2015 Prelim 2/8872/01 [Turn over 4 The first seven ionisation energies of an element M are shown in the sketch graph. What could be the identity of element M? A aluminium B magnesium C phosphorus D silicon 5 Ions of the two most common isotopes of zinc are shown below: 64 30 2+Zn 66 30 2+Zn Which of the following statements is correct? A Both Zn2+ ions