Class Xi MCQ Test

30 Questions | Attempts: 53
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    The atomic number of the element having maximum number of unpaired 3p electrons is (in ground state) 

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    • 10
    • 12
    • 8
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TIME ALLOTTED: 60 MINUTES
NEGATIVE MARKING OF -1 MARKS FOR INCORRECT ANSWERS

Class Xi MCQ Test - Quiz

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  • 2. 

    In an electronic transition atom cannot emit

    • Visible light

    • Gamma rays

    • Infra red light

    • UV light

    Correct Answer
    A. Gamma rays
  • 3. 

    Which orbital diagram does not obey Aufbau Principle? 

    • A

    • B

    • C

    • D

    Correct Answer
    A. B
  • 4. 

    An electron has kinetic energy 2.8×10-23 J De-broglie wavelength will be nearly? 

    • 9.8×10-24 

    • 9.8×10-7

    • 9.8×10-8

    • 9.8×10-10

    Correct Answer
    A. 9.8×10-8
  • 5. 

    If the Planck's constant h= 6.6 × 10-34  ​​Js , de Broglie wavelength of a particle having momentum of 3.3× 10-24 kg m s-1 will be

    • 0.02 A°

    • 0.5 A°

    • 2 A°

    • 500 A°

    Correct Answer
    A. 2 A°
  • 6. 

    The kinetic energy of the electron emitted when light of frequency 3.5 × 1015 Hz is thrown on a metal surface having threshold frequency 1.5×1015 Hz is ( h= 6.6 × 10-34 J/s) 

    • 1.32 × 10-18 J

    • 3.3 × 10-18 J

    • 6.6 × 10-19 J

    • 1.98 × 10-19 J

    Correct Answer
    A. 1.32 × 10-18 J
  • 7. 

    Which of the following statements does not form a part of Boards model of hydrogen atom? 

    • Energy of the electrons in the orbit is quantised

    • The electron in the orbit nearest the nucleus has the lowest energy 

    • Electrons revolve in different orbits around the nucleus

    • The position and the velocity of the electrons cannot be determined simultaneously

    Correct Answer
    A. The position and the velocity of the electrons cannot be determined simultaneously
  • 8. 

    The wavelength associated with a ball of mass 100g moving with a speed of 103 cm/sec (h= 6.6 × 10-34 J/s) is:-

    • 6.6 × 1032 cm 

    • 6.6 × 1027 cm 

    • 6.6 × 10-27 cm 

    • 6.6 × 10-32 cm 

    Correct Answer
    A. 6.6 × 10-32 cm 
  • 9. 

    The wavelength of spectral lines emitted is inversely proportional to? 

    • Velocity

    • Energy

    • Quantum number

    • Radius

    Correct Answer
    A. Energy
  • 10. 

    The wave number which corresponds to electromagnetic radiation of wavelength 500 nm is equal to 

    • 5×10-11 cm-1

    • 2×104 cm-1

    • 5×10-5 cm-1

    • 2×10-9 sec-1

    Correct Answer
    A. 2×104 cm-1
  • 11. 

    In an atom, for how many electrons, the quantum numbers will be, n=3, l=2 , m= +2 , s= +1/2

    • 18

    • 6

    • 24

    • 1

    Correct Answer
    A. 1
  • 12. 

    Assertion- The ground state configuration of Cr is 3d5 4s1 Reason- A set of exactly half filled orbitals containing parallel spin arrangement provide extra stability.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False. ​​

    • A

    • B

    • C

    • D

    Correct Answer
    A. A
  • 13. 

    Which of the following is represented by the configuration [Kr] 5s2 

    • Ca

    • Sr

    • Ba

    • Ra

    Correct Answer
    A. Sr
  • 14. 
    Electronic configuration given below has violated - ProProfs

    Electronic configuration given below has violated

    • Hund's rule

    • Paul's principle

    • Aufbau's principle

    • N+l rule

    Correct Answer
    A. Hund's rule
  • 15. 

    The De-broglie wavelength of an electron is 66 nm. The velocity of the electron is (h=6.6 × 10-34 kg m2 s​​​​​​-1 m=9.0 × 10-31 kg) 

    • 1.84 × 10-14 m s-1

    • 1.1 × 104 m s-1

    • 5.4 × 103 m s-1

    • 1.1 × 103  m s-1

    Correct Answer
    A. 1.1 × 104 m s-1
  • 16. 

    The electronic transition from n=2 to n=1 will produce shortest wavelength in (where n = principle quantum state) 

    • Li+2

    • He+

    • H

    • H+

    Correct Answer
    A. Li+2
  • 17. 

    Heisenberg Uncertainty principle is not valid for

    • Moving electron

    • Motor car

    • Stationary particles

    • 2 & 3 both

    Correct Answer
    A. 2 & 3 both
  • 18. 

    Assertion- No teo electrons in an atom can have the same values of four quantum numbers.  Reason- No two electrons in an atom can be simultaneously in the same shell, same Subshell, same orbitals and have same spin.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.​​​​​​

    • A

    • B

    • C

    • D

    Correct Answer
    A. A
  • 19. 

    The excitation energy of a hydrogen atom from its ground state to it's third excited state is

    • 12.75 eV

    • 0.85 eV

    • 10.2 eV

    • 12.1 eV

    Correct Answer
    A. 12.75 eV
  • 20. 

    Assertion- An orbital cannot have more than two electrons Reason-  The two electrons with opposite spin in an orbital create opposite magnetic field.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.

    • A

    • B

    • C

    • D

    Correct Answer
    A. A
  • 21. 

    Angular momentum for P-shell electron-

    • 3h/π

    • Zero

    • √2h/2π

    • None

    Correct Answer
    A. 3h/π
  • 22. 

    Assertion- In Rutherford's gold foil experiment, a very few alpha particles are deflected back.  Assertion- Nucleus present inside the atom is heavy.  ​​Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.  

    • A

    • B

    • C

    • D

    Correct Answer
    A. B
  • 23. 

    Assertion- The configuration of B atom cannotbe 1s2 2s3 Reason- Hund's rule demands that the configuration should display maximum multiplicity.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.

    • A

    • B

    • C

    • D

    Correct Answer
    A. B
  • 24. 

    Assertion- Bohr model fails in case of multielectron species.  Reason- It does not mention electron-electron interaction.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.

    • A

    • B

    • C

    • D

    Correct Answer
    A. A
  • 25. 

    The quantum numbers +1/2 and -1/2 for the electron spin represent? 

    • Rotation of electron in clockwise and anticlockwise direction respectively. 

    • Rotation of 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 analogue. 

    Correct Answer
    A. Two quantum mechanical spin states which have no classical analogue. 
  • 26. 

    Which of the following is correctly matched

    • Isotopes 20Ca40 19K40

    • Isotones Si30  P31  S32

    • Isobars O16  O17  O18

    • Isoelectronic N-3 O-2 CrCr+3

    Correct Answer
    A. Isoelectronic N-3 O-2 CrCr+3
  • 27. 

    Assertion- p- orbital has dumb bell shape.  Reason- Electrons present in p-orbital can have three values for 'm' - 0, +1 , -1 Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.

    • A

    • B

    • C

    • D

    Correct Answer
    A. B
  • 28. 

    The basis of three unpaired electrons present in the configuration of Nitrogen is

    • Aufbau's principle

    • Pauli's principle

    • Hund's principle

    • Uncertainty principle

    Correct Answer
    A. Uncertainty principle
  • 29. 

    Uncertainty in position of a 0.25 g particle is 10-5 m. Then uncertainty in its velocity will be? (h=6.6×10-34 Js) 

    • 1.2×1034

    • 2.1×10-26

    • 1.6×10-20

    • 1.7×10-9

    Correct Answer
    A. 1.6×10-20
  • 30. 

    The number of electrons that can be accommodated in dz2 orbital is? 

    • 10

    • 4

    • 1

    • 2

    Correct Answer
    A. 1

Quiz Review Timeline (Updated): Mar 14, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 14, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 14, 2020
    Quiz Created by
    Priyankjha11
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