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ALS10Q - Section 10 The p-Block Elements 1 SKH Bishop Baker...

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Section 10/ The p-Block Elements / SKH Bishop Baker Secondary School AL Chemistry Section 10 The p-Block Elements 81 IIB Q.6 (d) Both CO 2 and SO 2 turn lime water milky. Use this property and an additional reaction to distinguish whether a solid is either a carbonate or a sulphate(IV) (sulphite). (2 marks) 81 IIB Q.8 (b) Suggest the type(s) of material to be used for the construction of a container to transport either concentrated nitric(V) acid or concentrated sulphuric(VI) acid in bulk ? Justify your suggestion. (2 marks) (c) Suppose you were asked to advise on the action to be taken following a serious spillage of either concentrated nitric(V) acid or concentrated sulphuric(VI) acid in a crowded street. What would you suggest ? (2 marks) (c) Write on the present-day uses of EITHER concentrated nitric(V) acid, OR concentrated sulphuric(VI) acid. (4 marks) 81 IIB Q.10 (b)(i) Describe briefly an industrial method for the large-scale preparation of chlorine. (5 marks) (ii) How is chlorine transported from the manufacturer to the user ? (2 marks) (iii) Under what condition(s) does chlorine act as a bleaching agent ? Outline the chemistry involved. (3 marks) 82 IIB Q.8 (c) (i) State four nitrogen-containing compounds commonly used as fertilizers. (2 marks) (ii) Comment on the following aspects of the production of nitric(V) acid from ammonia : I. In the conversion of ammonia to nitrogen(II) oxide, excess air is required. (2 marks) II. The velocity of the ammonia-air mixture passing through the reactor must be well controlled. (2 marks) III. The exhaust gas is mixed with methane and the mixture is passed over a noble metal catalyst at an elevated temperature. (2 marks) (d) (i) Name one chemical property of the underlined substance that leads to its use in industry : I. Sulphur dioxide in food preserving, and II. Hydrogen sulphate(IV) in paper manufacture. 1
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Section 10/ The p-Block Elements / (2 marks) (ii) The sulphur content in crude oil can be determined by measuring the amount of sulphur dioxide generated by combusting the oil samples. Suggest an operating temperature for the combustion process. Explain your choice. (4 marks) (iii) Explain why water is not used as the absorbing material when sulphur dioxide is converted to sulphuric(VI) acid in the Contact Process. (2 marks) 82 IIB Q.10 (b)Briefly explain the anomalous behaviour of the first compound in the following figures : (6 marks) 83 IA Q.2 (b) Comment on the variation in the bond dissociation energies for the halogen family : Halogen F - F Cl - Cl Br - Br I - I Bond dissociation energy/kJ mol - 1 at 298 K +158 +242 +193 +152 (4 marks) 84 IIB Q.6 (c) The presence of chloride ions is tested for qualitatively by the appearance of a white precipitate on treatment with aqueous silver nitrate. Is this test applicable in both acidic and alkaline solution ? Give a reason for your answer.
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