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SEPARATION TECHNIQUES – IGCSE (MCQS), Which method is most suitable to obtain zinc carbonate from a suspension of zinc carbonate in, water?, 2, A crystallisation, В, distillation, evaporation, filtration, 0620_s/12/qp11, 2, An aqueous solution is coloured., Which method of separation would show that the solution contains ions of different colours?, A, chromatography, В, crystallisation, C, distillation, D, filtration, 0620_s/11/qp11, The table gives the solubility of four substances in ethanol and in water., A mixture containing all four substances is added to ethanol, stirred and filtered., The solid residue is added to water, stirred and filtered., The filtrate is evaporated to dryness, leaving a white solid., Which is the white solid?, solubility in, ethanol, water, insoluble, insoluble, insoluble, soluble, soluble, insoluble, soluble, soluble, 0620_s/11/qp11

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A fruit drink coloured orange contains a dissolved mixture of red and yellow colouring agents., One of these colouring agents is suspected of being illegal., 2, Which method could be used to show the presence of this illegal colouring agent?, A chromatography, distillation, C evaporation, D, filtration, 0620_s/10/qp11, The diagram shows the paper chromatograms of four substances, W, X, Y and Z., W, Y, Which two substances are pure?, A, W and X, W and Y, C X and Y, D X and Z, 0620_s/09/qp11, 3, Chromatography and fractional distillation can be used to separate compounds., In which type of separation is a thermometer needed for checking that complete separation has, occurred?, A chromatographic separation of two colourless solids, chromatographic separation of two solids of different colours, fractional distillation of two colourless liquids, fractional distillation of two liquids of different colours, 0620_s/08/qp1

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4, Which mixture can be separated by adding water, stirring and filtering?, A, barium chloride and sodium chloride, copper and magnesium, diamond and graphite, silver chloride and sodium nitrate, 0620_s/07/qp1, 2, Which method can be used to obtain crystals from aqueous copper(II) sulphate?, A chromatography, B, electrolysis, C, evaporation, neutralisation, 0620_s/06/qp1, 30 The pH of some aqueous sodium hydroxide is measured. The solution is then distilled as shown., thermometer, flask, NaOH(aq), heat, distillate, collected, How do the pH values of the distillate and of the solution left in the flask compare with the, original?, pH of the distillate pH of the solution, left in the flask, A, higher, higher, В, higher, lower, lower, higher, D, lower, lower, 0620_s/04/qp1

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4, The diagram shows a chromatogram obtained from three sweets, X, Y and Z., red, red, yellow, yellow, yellow, red, red, sweet X, sweet Y, sweet Z, How many different red dyes are present in the sweets?, A 1, 2, C 3, D 4, 0620_s/04/qp1, 3, Some chemical compounds are purified by recrystallisation., What can be used to test the purity of the crystals?, A, melting point, colour of crystals, size of crystals, solubility, 0620_s/03/qp1, 4, What could be the melting point and boiling point of water containing a dissolved impurity?, melting point / °C boiling point / °C, A, +3, 96, +3, 104, -3, 96, -3, 104, 0620_s/03/qp1

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1, The diagram shows how to obtain pure water from seawater., Where do water molecules lose energy?, water out, water in, B, seawater, pure water, D, A, Bunsen flame, 0620_s/03/qp1, A student is investigating a coloured mixture using chromatography., раper, pencil line, solvent, Where should he place the coloured mixture?, A, in the solvent, just above the pencil line, C, just below the pencil line, D, on the pencil Iline, 0620_w/14/qp13