Important Questions of Structure of Atom Chemistry | Zigya

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281.

The energies E1 and E2 of two radiations are 25 eV respectively. The relation between their wavelength i.e., λ1 and λ2 will be

  • λ1 = 2λ2

  • λ1 = 4λ2

  • λ1 = λ2/2

  • λ1 = λ2/2

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282.

If n =6, the correct sequence for filling of electrons will be

  • ns → (n-1) d → ( n - 2)f → np

  • ns - (n-2)f → np → (n-1)d

  • ns - np → (n-1)d → (n-2)f

  • ns - np → (n-1)d → (n-2)f

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283.

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?

  • 3s 4s 3p 3d

  • 4s 3s 3p 3d

  • 3s 3p 3d 4s

  • 3s 3p 3d 4s

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284.

According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

  • n= 6 to n = 1

  • n = 5 to n = 4

  • n= 6 to n = 5 

  • n= 6 to n = 5 

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285.

A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be
(h = 6.6 x 10-34 Js)

  • 6.6 x 10-32 m

  • 6.6 x 10-34 m

  • 1 x 10-35 m

  • 1 x 10-35 m

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286.

Maximum number of electrons in a subshell of an atom is determined by the following

  • 4l + 2

  •  2l +1

  • 4l-2

  • 4l-2

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287.

The energy absorbed by each molecule (A2) of a substance is 4.4 x 10-19 J and bond energy per molecule is 4.0 X 10-19 J. The kinetic energy of the molecule per atom will be

  • 2.0 x 10-20

  • 2.2 x 10-19 J

  • 2.0 x 10-19 J

  • 2.0 x 10-19 J

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288.

Which of the following is not permissible arrangement of electrons in an atom? 

  • n = 4, l=0, m=0, s=-1/2

  • n=5, l=3, m=0, s=+1/2

  • n=3, l=2, m=-3, s= -1/2

  • n=3, l=2, m=-3, s= -1/2

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289.

If uncertanity in position and momentum are equal, then uncertaninty in velocity is 

  • fraction numerator 1 over denominator 2 straight m end fraction square root of straight h over straight pi end root
  • square root of fraction numerator straight h over denominator 2 straight pi end fraction end root
  • 1 over straight m square root of h over pi end root
  • 1 over straight m square root of h over pi end root
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290.

The measurment of the electron position is associated with an uncerrtanity in momentum, which equal to 1 x 10-18 g cm s-1.The uncertanity in electron velocity is,

(mass of an electrons is 9 x 10-28 g) 

  • 1 x 108

  • 1  x 106 cm s-1

  •  1 x 105 cm s-1

  •  1 x 105 cm s-1

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