KCSE CHEMISTRY QUESTIONS AND ANSWERS PER TOPIC
The flow charts below show an analysis of a mixture R that contains two salts. Study the analysis and answer the questions that follow. (a) (i) What condition is necessary for the process in step I to take place?(1mk) (ii) Draw a labeled diagram for the set-up that could be used to separate the mixture formed in step II (2mks) (iii) Write ionic equation for the reaction between the cation in filtrate X and aqueous ammonia. (1mk) (iv) What observation would indicate the presence of NO2 (g) in step I (v) State how water vapour, in step I could be identified. (1mk) (b) (i) What conclusion can be drawn from step IV only? Explain? (2mks) (ii) Write the formula of an anion present in the residue U. Explain? (2mks) (iii) Suggest the identity of the cation present in solution z. (1mk) (c) Name the two salts present in the mixture R. (2mks)
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Describe how the following reagents can be used to prepare lead sulphate solid potassium sulphate, solid lead carbonate, dilute nitric acid and distilled water.
Expected Response
Dissolve the potassium sulphate (1/2) in water, dissolve (1/2) the lead carbonate in the nitric acid, mix the two solutions (1/2) and filter (1/2) off the lead sulphate precipitate//Dissolve lead carbonate in nitric acid add solid pbSO4 and filter off (max1 ½)//Dissolve this in HNO3 and add solid pbCO3 and filter off the precipitate.
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