Q.1 Statements: 1) Soaps can lather well in hard & soft water 2) Synthetic detergents form soluble calcium & magnesium salts with hard water. 3) Hard water contains chloride & sulphate salts of Magnesium & Calcium Options: A) 1 & 2 B) Only 3 C) 1,2,3 D) 2 & 3 Ans. D Q.2 statements: 1) sulphur dioxide & Nitrogen dioxide contribute to Acid Rain. 2) Oxides of carbon emitted from coal burns contribute to acid rain. Options: A) Only 1 B) Only 2 C) Both are correct D) Both are incorrect Ans. A Q.3 Why the aqueous solution of copper sulphate is acidic in nature ? A) Because salt undergoes electrolysis B) Because salt undergoes Photolysis C) Because salt undergoes dialysis D) Because salt undergoes hydrolysis Ans. D Q.4 Hard Water is not suitable for : 1) drinking 2) Washing clothes 3) use in boilers 4) irrigating crops Codes: A) 1 & 4 B) 1 & 2 C) 2 & 3 D) 1,2,4 Ans. C Q.5 consider the following statements: 1) Polluted water has high Biological Oxygen Demand. 2) Water pollution in river is measured by dissolved amount of Chlorine. Codes: A) Only 1 B) Only 2 C) Both are correct D) Both are incorrect Ans. A







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