Chemistry - Metals and Non-metals

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21. Which of the following is an are of mercury? (NTSE Maharashtra, Stage-I, 2015-16)

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22. Which of the following is the correct order of reactivity of metals? (NTSE Odisha, Stage-I, 2015-16)

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23. Which of the following is an are of copper? (NTSEW Odisha, Stage-I, 2015-16)

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24. A metal is strongly heated in presence of air to form a black mass. So, the metal is(NTSE Odisha, Stage-I, 2016-17)

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25. Bauxite is an are of aluminium. It is concentrated suitably on treating with (NTSE Odisha, Stage-I, 2016-17)

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