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Chemistry Test ...

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  • Question 1
    4 / -1

    The measurement of the electron position if associated with an uncertainty in momentum, which is equal to 1 × 10–18 g cm s– 1 . The uncertainty in electron velocity is? (mass of an electron is 9 × 10– 28 g)

  • Question 2
    4 / -1

    Until what element was the Law of Octaves determined to be applicable?

  • Question 3
    4 / -1

    How many number of molecules and atoms respectively are present in 2.8 litres of a diatomic gas at STP?

  • Question 4
    4 / -1

    By Lewis structure NO has following fact

  • Question 5
    4 / -1

    Alkali metals are assigned which group in the Modern Periodic Table?

  • Question 6
    4 / -1

    Among the following, the species having the smallest bond length is:

  • Question 7
    4 / -1

    The elements with atomic numbers 35, 53 and 85 are _________.

  • Question 8
    4 / -1

    Which of these belong to the same period?

    Element A B C

    Atomic number 2 10 5 respectively.

  • Question 9
    4 / -1

    The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionization energy of H=2.18 ×10–18J atom–1and h = 6.625 × 10–34 J s )

  • Question 10
    4 / -1

    The orientation of an atomic orbital is governed by

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