Question 11 : Ordinary glass is not a/an
1. amorphous isotropic material
2. supercooled liquid.
3. material with sharp definite melting point.
4. electrical insulator.
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Question 12 : Heating of __________ to 120°C, produces plaster of paris.
1. calcium silicate
2. gypsum
3. calcium sulphate
4. blue vitriol
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Question 13 : Which of the following is not produced on commercial scale from sea water?
1. Potassium compounds
2. Magnesium compounds
3. Bromine
4. Sodium sulphate.
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Question 14 : Most widely and commonly used coagulant for the removal of suspended impurities in water is
1. copper sulphate
2. slaked lime
3. bleaching powder
4. alum
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Question 15 : The catalyst used in the manufacture of DDT is
1. 20% oleum
2. silica
3. alumina
4. aluminium chloride.
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Question 16 : In premitive days, __________ was being manufactured by Leblanc Process.
1. washing soda
2. soda ash
3. alum
4. calcium carbide
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Question 17 : Helium is produced on commercial scale from
1. air
2. coke oven gas
3. natural gas
4. none of these
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Question 18 : Concentration of hydrogen peroxide is done by
1. crystallisation
2. vacuum crystallisation
3. atmospheric distillation
4. dehydration
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Question 19 : Pick out the wrong statement.
1. Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action.
2. Soap powder is prepared by mixing soap with hydrated sodium carbonate.
3. Tarnish inhibitor (e.g., benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc.
4. Detergents differ from soaps in their action in hard water.
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Question 20 : Fermentation of molasses to produce ethyl alcohol is done at __________ °C
1. 100 - 150
2. 20 - 30
3. 250 - 300
4. <-5
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