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P - Block Eleme...

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  • Question 1
    4 / -1

    Ordinary oxygen contains

  • Question 2
    4 / -1

    The substance which does not liberate oxygen on treatment with ozone is

  • Question 3
    4 / -1

    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

  • Question 4
    4 / -1

    Moist iodine reacts with ozone to give

  • Question 5
    4 / -1

    Ozone is

  • Question 6
    4 / -1

    Which of the following is a true acidic anhydride ?

  • Question 7
    4 / -1

    The reddish brown gas formed when nitric oxide is oxidised by air is

  • Question 8
    4 / -1

    When conc. HNO3 is heated with P2O5 it forms

  • Question 9
    4 / -1

    The catalyst used in manufacture of HNO3 by Ostwald’s process is

  • Question 10
    4 / -1

    A hydride of nitrogen which is acidic is

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