Explain the chemical phenomenon involved in the purification of water using potash alum.
Answer:
The purification of water involves the coagulation (precipitation) of suspended colloidal particles of clay, sand etc., by the addition of potash alum. Alum gives Al3+ ions in water, which discharge the negatively charged dirt or clay particles suspended in water, causing them to coagulate. Further Al2(SO4)3 present in alum is partly hydrolysed by water to give colloidal Al(OH)3which absorbs the suspended particles also.
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How is a colloidal solution purified by ultrafiltration?
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Justify the use of gelatin as a protective colloid.
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What are the different steps involved in a heterogeneously catalysed reaction?
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Some zeolites are used to separate long straight chain hydrocarbons from branched chain hydrocarbons in petrochemical industry. Explain how this separation becomes possible.
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Long Answer Type
What are Brownian movement?
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Short Answer Type
What is the coagulating power of an electrolyte? What is the cause of coagulation?
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Consider the adsorption isotherm given below and interpret the variation in the extent of adsorption (x/m) when:
(i) temperature increases at constant pressure. (ii) pressure increases at constant temperature.
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Long Answer Type
Give applications of colloids in detail.
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Explain the purification of colloidal solutions by dialysis and ultrafiltration.
