General Studies  Chemistry

11. With tooth paste phenolphthalein gives

Green Blue Pink Red
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12. Which is used to remove hardness of water

Sodium carbonate Potasssium carbonate Calcium carbonate None
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13. Which is used in fire extinguisher

sodium carbonate Sodium bicarbonate Calcium carbonate None
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14. Which is used in preservation of food stuffs

sodium carbonate Sodium bicarbonate Calcium carbonate Sodium Benzoate
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15. Which is used to kill the bacteria in drinking water

Bleaching powder Plaster of paris Calcium sulphate Magnesium sulphate
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16. Which used to induce blood clotting

Potash alum Plaster of paris Sulphate None
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17. Which silver salt used in photography

Agcl AgBr AgI AgNO3
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18. Which ion present in Haemoglobin

Fe2+ Fe3+ Cu+ Cu2+
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19. Which acid attack the glass

Hcl HBr HF HI
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20. The effect of electric current used in electroplating

Heating effect Mechanical effect Chemical effect Magnetic effect
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