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The high reactivity of fluorine is due to
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The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
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The agent which is oxidized in photosynthesis is
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In which of the following pairs, the two substances forming the pair are chemically most dissimilar?
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The reaction which converts sugar solution into alcohol is an example of
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The chief constituent of gobar gas is
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The air we inhale is mixture of gases. Which of the following gases in the mixture is highest in percentage?
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The red blood cells are in the
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The credit of developing the polio vaccine goes to
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The chief purpose of crop rotation is to check the loss of top soil
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