131.Do you expect different products in solution when aluminium (III) chloride and potassium chloride are treated separately with: (i) normal water (ii) acidifed water and (iii) alkaline water?
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132.
What is hard and soft water?
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Long Answer Type
133.What causes the temporary and permanent hardness of water? Or Distinguish clearly between temporary hardness and permanent hardness. Or What is hardness of water due to? What are its types?
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Short Answer Type
134.
Why does hard water not form lather with soap?
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Long Answer Type
135.
What are different methods used for softening of hard water?
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136.What is ‘demineralised water’ and how can it be obtained?
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137.Discuss the principle and method of softening of hard water by synthetic ion-exchange resins. Or What do you mean by synthetic ion-exchange resins?
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Short Answer Type
138.
How will you prepare a sample of temporary hard water from lime water? Write equation for the reactions involved.
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139.When hard water is boiled in electric kettle, a white scale gets formed inside the kettle. How is this scale formed? What is its harm?
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Long Answer Type
