61 .Which one among the following is used in making gunpowder?
A.  Magnesium sulphate
B.  Potassium nitrate
C.  Sodium stearate
D.  Calcium sulphate
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62 .The process of sudden cooling is known as -
A.  annealing
B.  diffusion
C.  quenching
D.  sedimentation
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63 .Hydrochloric acid is also known as
A.  Garlic acid
B.  Picric acid
C.  Muriatic acid
D.  Chloric acid
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64 .The blue colour of water in the sea is due to-
A.  Refraction of the blue light by the impurities in sea water
B.  Scattering of blue light by water molecules
C.  Refraction of blue sky by sea water
D.  Absorption of other colours except the blue colour by water molecules
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65 .Neclear fission is caused by the impact of -
A.  Neutrons
B.  Protons
C.  Deuteron
D.  Electron
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66 .Chromatography technique is used for the separation of
A.  Small sample of mixture
B.  Plant pigments
C.  Dye stuff
D.  All
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67 .In electro - refining, the pure metal is deposited on-
A.  Cathode
B.  Anode
C.  Vessel
D.  Electrolyte
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68 .There are only two metals that are non-silver in color, they are
A.  Sodium & Magnesium
B.  Copper & Gold
C.  Palladium & Platinum
D.  Nickel & Zinc
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69 .Who among the following proposed that atom is indivisible?
A.  Dalton
B.  Berzelius
C.  Rutherford
D.  Avogadro
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70 .Permanent hardness of water is due to the presence of
A.  Sulphates of sodium and potassium
B.  Sulphates of magnesium and calcium
C.  Carbonates of sodium and magnesium
D.  Bicarbonates of magnesium and calcium
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71 .The chemical used as a fixer /developer in photography
A.  Sodium sulphate
B.  Sodium sulphide
C.  Sodium thiosulphate
D.  Sodium sulphite
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72 .The first organic compound synthesized in the laboratory was
A.  Urea
B.  Uric acid
C.  Lactic acid
D.  Glucose
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73 .Which one is an example of Miscelles System here-
A.  Soap – Water
B.  Protein + Water
C.  Rubber – Benzene
D.  All of these
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74 .Ozone depletion in the stratosphere is mainly caused by-
A.  SO2
B.  NO2
C.  NO
D.  Chlorofluorocarbons
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75 .Lemon is sour due to-
A.  Citric acid
B.  Tartaric acid
C.  Oxalic acid
D.  Acetic acid
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