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Q. Which among the given elements does not exhibit natural radioactivity
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Q. Positive oxidation state of oxygen is possible only in
Q. Potassium nitrate is used in
Q. Brass gets discoloured in air because of the presence of which of the following gases in air?
Q. A man with colour blindness will see red as
Q. The weight of a rusted iron object compared to that of an unrusted one is
Q. he first 'thermionic value' was invented by
Q. Who among the following worked on Tuberculosis?
Q. Mercury poisoning in man causes the disease
Q. Contact force is another name for ……
Q. Which among the given illustrations is not based on the principle of pressure?
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