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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