NEET Chemistry: Structure of Atom — MCQ Test 15

Q6. A photon of energy \( 5.0 \times 10^{-19} \, \text{J} \) strikes a metal with a work function of \( 3.5 \times 10^{-19} \, \text{J} \). What is the velocity of the ejected electron? (\( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q7. The angular momentum of an electron in the fourth orbit of a hydrogen atom is \( 4.22 \times 10^{-34} \, \text{J s} \). What is its energy in eV? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} \))

Q8. The wavelength of the third line in the Pfund series of a hydrogen atom is: (\( R_H = 1.097 \times 10^7 \, \text{m}^{-1} \))

Q9. The kinetic energy of an electron in the third orbit of \( \text{Be}^{3+} \) is \( 2.42 \times 10^{-18} \, \text{J} \). What is its velocity? (\( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q10. An electron and a proton have the same de Broglie wavelength. What is the ratio of their kinetic energies? (\( m_p = 1.67 \times 10^{-27} \, \text{kg} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

NEET Chemistry — Structure of Atom

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The radius of the first Bohr orbit of a hydrogen atom is \( 5.29 \times 10^{-11} \, \text{m} \). What is the radius of the second Bohr orbit?

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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 Hydrogen, Following, Particles, Wavelength, Velocity, and Electron.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. The radius of the first Bohr orbit of a hydrogen atom is \( 5.29 \times 10^{-11} \, \text{m} \). What is the radius of the second Bohr orbit?

  • A. \( 2.116 \times 10^{-10} \, \text{m} \)
  • B. \( 1.058 \times 10^{-10} \, \text{m} \)
  • C. \( 5.29 \times 10^{-11} \, \text{m} \)
  • D. \( 4.232 \times 10^{-10} \, \text{m} \)

Q2. Which of the following particles has the longest de Broglie wavelength if all have the same velocity?

  • A. Proton
  • B. Neutron
  • C. Alpha particle
  • D. Electron

Q3. What is the de Broglie wavelength of an electron moving with a velocity of \( 2.0 \times 10^6 \, \text{m s}^{-1} \)? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

  • A. \(1.82 \times 10^{-10} \, \text{m}\)
  • B. \(3.64 \times 10^{-10} \, \text{m}\)
  • C. \(5.46 \times 10^{-10} \, \text{m}\)
  • D. \(7.28 \times 10^{-10} \, \text{m}\)

Q4. Which set of quantum numbers is not possible for an electron?

  • A. \( n = 2, l = 1, m_l = 0, m_s = +1/2 \)
  • B. \( n = 3, l = 0, m_l = 0, m_s = -1/2 \)
  • C. \( n = 1, l = 1, m_l = 0, m_s = +1/2 \)
  • D. \( n = 4, l = 2, m_l = -2, m_s = -1/2 \)

Q5. The threshold wavelength of a metal is \( 500 \, \text{nm} \). What is its work function in joules? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( c = 3.0 \times 10^8 \, \text{m s}^{-1} \))

  • A. \( 6.626 \times 10^{-19} \, \text{J} \)
  • B. \( 3.9756 \times 10^{-19} \, \text{J} \)
  • C. \( 2.6504 \times 10^{-19} \, \text{J} \)
  • D. \( 1.9878 \times 10^{-19} \, \text{J} \)

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