NEET Chemistry: Structure of Atom — MCQ Test 1

Q6. The radius of the first Bohr orbit of \( \text{He}^+ \) is \( 2.645 \times 10^{-11} \, \text{m} \). What is the radius of the third orbit of \( \text{Li}^{2+} \) if the Bohr radius for hydrogen is \( 5.29 \times 10^{-11} \, \text{m} \)?

Q7. The threshold frequency of a metal is \( 5.0 \times 10^{14} \, \text{Hz} \). What is its work function in eV? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} \))

Q8. An electron in \( \text{He}^+ \) transitions from \( n = 3 \) to \( n = 1 \). What is the wavelength of the emitted photon in nm? (\( R_H = 1.097 \times 10^7 \, \text{m}^{-1} \), \( c = 3.0 \times 10^8 \, \text{m s}^{-1} \))

Q9. An electron has a de Broglie wavelength of \( 2.0 \times 10^{-10} \, \text{m} \). What is its kinetic energy in joules? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q10. What is the frequency of light emitted when an electron in \( \text{He}^+ \) transitions from \( n = 2 \) to \( n = 1 \)? (\( R_H = 1.097 \times 10^7 \, \text{m}^{-1} \), \( c = 3.0 \times 10^8 \, \text{m s}^{-1} \))

NEET Chemistry — Structure of Atom

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The ratio of the velocities of an electron in the second orbit of \( \text{H} \) to the third orbit of \( \text{Li}^{2+} \) is: (\( v_1 \) for H = \( 2.19 \times 10^6 \, \text{m s}^{-1} \))

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Chemistry preparation, focusing specifically on the chapter Structure of Atom. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Velocities, Electron, Wavelength, Uncertainty, Position, and Electrons.

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Preview of Questions in this Test

Q1. The ratio of the velocities of an electron in the second orbit of \( \text{H} \) to the third orbit of \( \text{Li}^{2+} \) is: (\( v_1 \) for H = \( 2.19 \times 10^6 \, \text{m s}^{-1} \))

  • A. \( 1.5 \)
  • B. \( 0.5 \)
  • C. \( 3.0 \)
  • D. \( 0.33 \)

Q2. The de Broglie wavelength of an electron is \( 5.0 \times 10^{-10} \, \text{m} \) and its kinetic energy is \( 3.026 \times 10^{-19} \, \text{J} \). What is the uncertainty in its position? (\( h = 6.626 \times 10^{-34} \, \text{J s} \))

  • A. \( 1.99 \times 10^{-11} \, \text{m} \)
  • B. \( 5.27 \times 10^{-11} \, \text{m} \)
  • C. \( 3.98 \times 10^{-11} \, \text{m} \)
  • D. \( 6.62 \times 10^{-11} \, \text{m} \)

Q3. How many electrons in an atom can have the quantum numbers \( n = 6 \) and \( l = 4 \)?

  • A. 14
  • B. 18
  • C. 10
  • D. 22

Q4. The wavelength of the fifth line in the Pfund series of a hydrogen atom is: (\( R_H = 1.097 \times 10^7 \, \text{m}^{-1} \))

  • A. \( 2279 \, \text{nm} \)
  • B. \( 3741 \, \text{nm} \)
  • C. \( 3039 \, \text{nm} \)
  • D. \( 4654 \, \text{nm} \)

Q5. The ratio of the wavelengths of the second lines in the Balmer and Paschen series of a hydrogen atom is: (\( R_H = 1.097 \times 10^7 \, \text{m}^{-1} \))

  • A. \( 2.64 \)
  • B. \( 0.379 \)
  • C. \( 1.52 \)
  • D. \( 0.185 \)

+ 5 more questions in the actual test

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