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Number of molecules of water of crystallisation in copper sulphate, sodium carbonate and gypsum are

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Important Questions on Elements, Compounds and Mixtures
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Which one of the following was the first mineral acid discovered?

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Which one of the following statements about glass is not correct?

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The raw materials used for the manufacture of Portland cement are:

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Which one of the following does not represent the salt, calcium carbonate?

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Which one of the following substances is not a mixture?

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Which one of the following is termed as 'dry ice'?

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IMPORTANT
Which one of the following is not a monoatomic element?

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IMPORTANT
Which one of the following substances is not a mixture?
