Which of the following sets of quantum numbers is correct for an

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 Multiple Choice QuestionsMultiple Choice Questions

131.

The basis of quantum mechanical model of an atom is

  • angular momentum of electron

  • quantum numbers

  • dual nature of electron

  • black body radiation


132.

The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is

  • spin

  • azimuthal

  • magnetic

  • principal


133.

A compound absorbs light in the wavelength region 490-500 nm. Its complementary colour is

  • red

  • blue

  • orange

  • blue-green


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134.

Which of the following sets of quantum numbers is correct for an electron in 3d-orbital?

  • n = 3; l = 2; m = -3; s = +12

  • n = 3; l = 3; m = +3; s = -12

  • n = 3; l = 2; m = -2; s = +12

  • n = 3; l = 2; m = -3; s = -12


C.

n = 3; l = 2; m = -2; s = +12

Among the given sets of quantum numbers, set c is the correct option.

Step I. The value of n for the given electron is 3. 

 n = 3

Step II. Value of l should never be greater than n and for the given case, it is 0 to (n - 1).

 l = (n - 1) = (3 - 1) = 2

Step III. Value of m varies from -l to +l, including 0. 

 m = -2, -1, 0, +1 and +2.

Step IV. Value of s may be +12 (clockwise) or -12 (anticlockwise).

 For, 3d electron, s = +12


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135.

If the kinetic energy of a particle is reduced to half, de-Broglie wavelength becomes

  • 2 times

  • 12 times

  • 4 times

  • 2 times


136.

In an atom the order of increasing energy of electrons with quantum numbers

(i) n=4, l=1      (ii) n=4, l=0     (iii) n=3, l=2 and (iv) n=3, l=1 is

  • III < I <IV < II

  • II < IV < I<III

  • I <III <II <IV

  • IV< II <III <I


137.

The number of angular and radial nodes of 4d orbital respectively are

  • 3,1

  • 1,2

  • 3,0

  • 2,1


138.

The product of uncertainty in velocity and uncertainty in position of a micro particle of mass 'm' is not less than in which of the following?

  • h × 3πm

  • h3π× m

  • h4π × 1m

  • h4π × m


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139.

2p orbitals have

  • n = 1; l = 2

  • n = 1; l = 0

  • n = 2; l = 1

  • n = 2; l = 0


140.

Aufbau principle is not satisfied by

  • Cr and Cl

  • Cu and Ag

  • Cr and Mg

  • Cu and Na


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