NEET Chemistry: Structure of Atom — MCQ Test 20

Q6. The frequency of a photon emitted during a transition from \( n = 7 \) to \( n = 4 \) in a hydrogen atom is: (\( E_1 = -2.18 \times 10^{-18} \, \text{J} \), \( h = 6.626 \times 10^{-34} \, \text{J s} \))

Q7. What is the maximum number of emission lines when an electron in a hydrogen atom drops from \( n = 5 \) to the ground state?

Q8. The uncertainty in velocity of an electron is \( 1.0 \times 10^6 \, \text{m s}^{-1} \). What is the minimum uncertainty in its position? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q9. A photon of energy \( 6.626 \times 10^{-19} \, \text{J} \) ejects an electron from a metal with a kinetic energy of \( 2.0 \times 10^{-19} \, \text{J} \). What is the stopping potential of the electron? (\( e = 1.6 \times 10^{-19} \, \text{C} \))

Q10. The ratio of the radii of the third orbit of \( \text{He}^+ \) to the second orbit of \( \text{Li}^{2+} \) is: (\( r_1 \) for H = \( 5.29 \times 10^{-11} \, \text{m} \))

NEET Chemistry — Structure of Atom

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An electron in \( \text{C}^{5+} \) has an angular momentum of \( 4.22 \times 10^{-34} \, \text{J s} \). What is its kinetic energy? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \), \( v_1 \) 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 Electron, Momentum, Electrons, Spectral, Produced, and Hydrogen.

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. An electron in \( \text{C}^{5+} \) has an angular momentum of \( 4.22 \times 10^{-34} \, \text{J s} \). What is its kinetic energy? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \), \( v_1 \) for H = \( 2.19 \times 10^6 \, \text{m s}^{-1} \))

  • A. \( 2.18 \times 10^{-18} \, \text{J} \)
  • B. \( 9.82 \times 10^{-18} \, \text{J} \)
  • C. \( 1.23 \times 10^{-18} \, \text{J} \)
  • D. \( 4.91 \times 10^{-18} \, \text{J} \)

Q2. How many electrons in an atom can have \( n = 3 \) and \( l = 2 \)?

  • A. 6
  • B. 2
  • C. 10
  • D. 14

Q3. How many electrons can have the quantum numbers \( n = 2, l = 0 \) in an atom?

  • A. 2
  • B. 6
  • C. 10
  • D. 4

Q4. The number of spectral lines produced when an electron falls from \( n = 8 \) to \( n = 4 \) in a hydrogen atom is:

  • A. 5
  • B. 6
  • C. 4
  • D. 7

Q5. An electron in the fourth orbit of a hydrogen atom has a velocity of \( 5.475 \times 10^5 \, \text{m s}^{-1} \). What is its de Broglie wavelength? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

  • A. \( 1.33 \times 10^{-9} \, \text{m} \)
  • B. \( 6.65 \times 10^{-10} \, \text{m} \)
  • C. \( 2.66 \times 10^{-9} \, \text{m} \)
  • D. \( 9.98 \times 10^{-10} \, \text{m} \)

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