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P - Block Elements Test - 20

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P - Block Elements Test - 20
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    Ordinary oxygen contains
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    The substance which does not liberate oxygen on treatment with ozone is
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    A large part of the harmful UV radiations of the sun does not reach the surface of the earth. This is because in the upper atmosphere, there is a layer of
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    Moist iodine reacts with ozone to give
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    Ozone is
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    Which of the following is a true acidic anhydride ?
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    The reddish brown gas formed when nitric oxide is oxidised by air is
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    When conc. HNO3 is heated with P2O5 it forms
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    The catalyst used in manufacture of HNO3 by Ostwald’s process is
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    A hydride of nitrogen which is acidic is
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