61 .Which one among the following is used in making gunpowder?

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62 .The process of sudden cooling is known as -

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63 .Hydrochloric acid is also known as

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64 .The blue colour of water in the sea is due to-

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65 .Neclear fission is caused by the impact of -

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66 .Chromatography technique is used for the separation of

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67 .In electro - refining, the pure metal is deposited on-

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68 .There are only two metals that are non-silver in color, they are

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69 .Who among the following proposed that atom is indivisible?

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70 .Permanent hardness of water is due to the presence of

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71 .The chemical used as a fixer /developer in photography

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72 .The first organic compound synthesized in the laboratory was

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73 .Which one is an example of Miscelles System here-

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74 .Ozone depletion in the stratosphere is mainly caused by-

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75 .Lemon is sour due to-

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