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Q. Which among the given is not a chemical action?
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Q. Sulphur dioxide level in the atmosphere can be reduced by using
Q. Removal of carbon particles from air involves the principle of
Q. Photosynthesis takes place faster in
Q. Purity of gold is expressed in terms of carat. Purest form of gold is
Q. Brass gets discoloured in air due to the presence of which gas in air?
Q. An artificial satellite orbiting the earth does not fall down because the earth's attraction
Q. When a ship enters the sea from a river
Q. Who among the following defined the law of gravitation
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