The radius of hydrogen atom is 0.53 Å. The radius of&n

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 Multiple Choice QuestionsMultiple Choice Questions

691.

The orbital angular momentum of an electron in 2s orbital is

  • +12h2π

  • zero

  • h2π

  • 2h2π


692.

The number of electron and neturons of an element is 18 and 20 respectively. Its mass number is

  • 2

  • 17

  • 37

  • 38


693.

The number of α and β particles emitted in nuclear reaction Th22890 Bi21283 are respectively

  • 4,1

  • 3,7

  • 8,1

  • 4,7


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694.

The radius of hydrogen atom is 0.53 Å. The radius of 3Li2+ is of:

  • 1.27 Å

  • 0.17 Å

  • 0.57 Å

  • 0.99 Å


B.

0.17 Å

The radius of hydrogen atom = 0.53 Å.

3Li+2 ion consists of only 1 electron but it has 3 protons in its nucleus. Hence, its electron fall is three times more attracted from nucleus as compared to hydrogen atom. Thus, the radius of 3Li+2 is = 0.533 = 0.17 Å


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695.

Wave nature of electrons was demonstrated by :

  • Schrodinger

  • de-Broglie

  • Davisson and Garmer

  • Heisenberg


696.

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

  • 6p > 5f > 5p > 4d

  • 6p > 5f > 4d > 5p

  • 5f > 6p > 4d > 5p

  • 5f > 6p > 5p > 4d


697.

Which of the following series of transitions in the spectrum of hydrogen atom fall in visible region?

  • Balmer series

  • Paschen series

  • Brackett series

  • Lyman series


698.

Non - directional orbital is :

  • 4p

  • 4d

  • 4f

  • 3s


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699.

Assertion (A) : Atoms with completely filled and half-filled sub-shells are stable.

Reason (R): Completely filled and half-filled sub-shells have symmetrical distribution of electrons and have maximum exchange energy.

The correct answer is

  • (A) and (R) are correct, (R) is the correct explanation of (A)

  • (A) and (R) are correct, (R) is not the correct explanation of (A)

  • (A) is correct, but (R)is not correct

  • (A) is not correct, but (R) is correct


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