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S.3 Chemistry PastPapers

Acids, Bases, Salts and Qualitative Analysis

1. Write equation(s) only to show the reaction that would take place if each of the following was strongly heated in air. 

(a). KNO3 

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(b). Na2CO3.10H2O 

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(c). FeCO3 

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(d). Pb(NO3)2 

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2. (a). Define the term acid 

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(b). State what would be observed if an aqueous solution of each of the following substances were tested with a blue litmus paper. 

(i). Ammonium chloride 

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(ii). Sodium chloride 

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(iii). potassium carbonate 

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(c). Write the equation for the reaction between potassium oxide and: 

(i). Hydrochloric acid 

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(ii). nitric acid 

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(iii) Sulphuric acid 

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3. A mixture containing Copper(II) sulphate and Copper(II) carbonate was shaken with excess water and filtered. 

(a). Identify the residue 

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(b). The dry residue was heated strongly. 

(i). State what was observed 

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(ii). Write an equation for the reaction 

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(c).   (i). Name the reagent that can be used to identify the anion in the filtrate 

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(ii). Write an ionic equation for the anion and the reagent you have named in c(i) 

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4. (a).Lead(II) nitrate was heated until there was no further change. 

(i). What was observed 

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(ii). Write an equation for the reaction that took place 

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