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CSIR General Science Chemistry

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  1. Pure water can be obtained from sea water by the process of

    1. Filtration

    2. Distillation

    3. Evaporation

    4. Fractional distillation

  2. Common salt is obtained from sea water by the process of

    1. Sublimation

    2. Evaporation

    3. Cystallisation

    4. Filtration

  3. Gasoline is obtained from crude oil by the process of

    1. Evaporation

    2. Fractional distillation

    3. Distillation

    4. Filtration

  4. An electric kettle used for boiling hard water has a white scale deposited on its heating elements. This consists of

    1. Sugar

    2. Common salt

    3. Carbonates of calcium and magnesium

    4. Sodium Carbonate

  5. Washing soda is

    1. Sodium chloride

    2. Hydrated sodium carbonate

    3. Sodium bicarbonate

    4. Calcium carbonate

  6. Carborundum is a compound of

    1. Ca

    2. Ge

    3. Si

    4. S

  7. Hard water does not lather well with soap because

    1. It contains carbonates of calcium and magnesium

    2. It is highly coloured

    3. It contains suspended impurities

    4. It contains sodium chloride

  8. Water, on passing over rocks, becomes hard because it dissolves

    1. Calcium carbonate

    2. Sodium chloride

    3. Sodium carbonate

    4. Sodium phosphate

  9. The process of changing of one element into another is called

    1. Radioactive decay

    2. Transmutation of the elements

    3. Covalent bond formation

    4. Hybridization

  10. Chemically, baking soda is

    1. Calcium phosphate

    2. Sodium bicarbonate

    3. Sodium chloride

    4. Baker's yeast

  11. A saturated solution at a particular temperature

    1. Is colourless

    2. Is highly coloured

    3. Does not dissolve any more of the solid solute

    4. Contains suspended solid particles

  12. Laundery soap is

    1. A mixture of sodium salts of higher fatty acids of natural origin

    2. Sodium carbonate

    3. Sodium sulphate

    4. A mixture of sodium salts of synthetic sulphonic acids

  13. Synthetic detergents are

    1. Sodium salts of fatty acids

    2. A mixture of sodium carbonate and sodium chloride

    3. Calcium salts of hydrochloric acid

    4. A mixture of sodium salts of aromatic and aliphatic sulphonic acids

  14. Detergents produce lather with hard water because

    1. They are soluble in hard water

    2. They are colourless substances

    3. The calcium and magnesium salts of sulphonic acids are soluble in water

    4. They form sodium carbonate with hard water

  15. Lime water contains

    1. Sodium hydroxide

    2. calcium hydroxide

    3. Sodium carbonate

    4. Calcium chloride

  16. Which of the following are false statements?

    1. Ozone is an allotropic form of oxygen.

    2. Phosphorus is present in DNA and RNA

    3. Halogens occur in free state in nature.

    4. The compounds of chlorine are used as cooling agents

    Which are correct?

    1. I, IV

    2. II, IV

    3. III, IV

    4. I, II

  17. The ratio of different gases in air is

    1. Unknown

    2. Fixed

    3. Different from place to place

    4. Independent of industrialization of towns

  18. Cooking oil can be converted into vegetable ghee by the process of

    1. Hydrogenation

    2. Distillation

    3. Crystallisation

    4. Oxidation

  19. Iron articles rust because of the formation of

    1. Ferros chloride

    2. A mixture of ferrous and ferric hydroxides

    3. Ferric sulphate

    4. Ferric chloride

  20. Diamond is chemically

    1. A mixture of metal carbonates

    2. Pure carbon

    3. A pure form of sand

    4. A mixture of calcium and magnesium phosphates

  21. Nitrogen in air

    1. Is essential for the body

    2. Dilutes oxygen which, otherwise, is very active in the pure form

    3. Makes oxygen soluble in blood

    4. Decreases the density of air

  22. Two solutions are said to be isotonic when they

    1. Have the same osmotic pressure

    2. Are of equal concentration

    3. Contain the same solute dissolved in them

    4. Have the same vapour pressure

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