In the electronic structure of H2SO4 , the total number of unshar

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 Multiple Choice QuestionsMultiple Choice Questions

311.

A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second? (h = 6.626x 10-34 J-s; velocity of light = 3x108 ms-1)

  • 1 x 1019

  • 1 x 1020

  • 1 x 1021

  • 1 x 1023


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312.

In the electronic structure of H2SO4 , the total number of unshared electrons is

  • 20

  • 16

  • 12

  • 8


A.

20

The structure of H2SO4 is 

Total number of unshared electrons = 10 x 2 = 20

Therefore, among all the given options, option a is correct.


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313.

Which of the following relation is correct ?

  • Ist IE of C > Ist IE of B

  • Ist IE of C < Ist IE of B

  • IInd IE of C > IInd IE of B

  • Both (b) and (c)


314.

Considering H2O as weak field ligand, the number of unpaired electrons in [Mn(H2O)6] will be (Atomic number of Mn = 25)

  • five

  • two

  • four

  • three


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315.

The quantum numbers +12 and -12 for the electron spin represent

  • rotation of the electron in clockwise and anticlockwise direction respectively

  • rotation of the electron in anticlockwise and clockwise direction respectively

  • magnetic moment of the electron pointing up and down respectively

  • two quantum mechanical spin states which have no classical analogues


316.

What is the wave number of 4th line in Balmer series of hydrogen spectrum ? (R =1,09,677 cm-1)

  • 24630 cm-1

  • 24360 cm-1

  • 24730 cm-1

  • 24372 cm-1


317.

Heisenberg uncertainty principle can be explained as

  • x  P × h4π

  • x × P  h4π

  • x × P  hπ

  • P  πhx


318.

The de-Broglie wavelenght of a particle with mass 1 kg and velocity 100 m/s is

  • 6.6 x 10-33 m

  • 6.6 x 10-36 m

  • 3.3 x 1033 m

  • 3.3 x 10-36 m


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319.

Neutron is discovered by

  • Chadwick

  • Rutherford

  • Yukawa

  • Dalton


320.

What is X in the following nuclear reaction?

7N141H1 8O15 + X

  • 0n1

  • -1e0

  • +1e0

  • γ


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