NEET Chemistry: Structure of Atom — MCQ Test 5

Q6. A metal has a threshold frequency of \( 6.0 \times 10^{14} \, \text{Hz} \). What is the kinetic energy of an electron ejected by light of frequency \( 9.0 \times 10^{14} \, \text{Hz} \)? (\( h = 6.626 \times 10^{-34} \, \text{J s} \))

Q7. What is the energy difference between \( n = 1 \) and \( n = 2 \) levels in a hydrogen atom for photon emission? (\( E_1 = -2.18 \times 10^{-18} \, \text{J} \))

Q8. The energy difference between the first and third orbits of a hydrogen atom is \( 1.936 \times 10^{-18} \, \text{J} \). What is the frequency of the photon emitted when an electron falls from \( n = 3 \) to \( n = 1 \)? (\( h = 6.626 \times 10^{-34} \, \text{J s} \))

Q9. Which of the following elements has the electronic configuration \( 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 \)?

Q10. The ionization energy of a hydrogen atom is \( 13.6 \, \text{eV} \). What is the wavelength of the photon emitted when an electron in \( \text{C}^{5+} \) falls from \( n = 4 \) to \( n = 2 \)? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( c = 3.0 \times 10^8 \, \text{m s}^{-1} \), \( 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} \))

NEET Chemistry — Structure of Atom

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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? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

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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 Uncertainty, Velocity, Electron, Position, Spectral, and Observed.

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

  • A. \( 2.9 \times 10^{-11} \, \text{m} \)
  • B. \( 1.45 \times 10^{-11} \, \text{m} \)
  • C. \( 7.3 \times 10^{-11} \, \text{m} \)
  • D. \( 5.8 \times 10^{-11} \, \text{m} \)

Q2. How many spectral lines are observed when an electron falls from \( n = 6 \) to \( n = 3 \) in a hydrogen atom?

  • A. 3
  • B. 4
  • C. 5
  • D. 6

Q3. The wavenumber of the third line in the Lyman series of a hydrogen atom is: (\( R_H = 1.097 \times 10^7 \, \text{m}^{-1} \))

  • A. \( 1.028 \times 10^7 \, \text{m}^{-1} \)
  • B. \( 9.753 \times 10^6 \, \text{m}^{-1} \)
  • C. \( 8.223 \times 10^6 \, \text{m}^{-1} \)
  • D. \( 1.097 \times 10^7 \, \text{m}^{-1} \)

Q4. What is the maximum number of electrons that can have \( n = 4 \) in an atom?

  • A. 18
  • B. 32
  • C. 8
  • D. 50

Q5. How many possible values of \( m_l \) are there for an electron with \( n = 5 \) and \( l = 4 \)?

  • A. 7
  • B. 5
  • C. 9
  • D. 11

+ 5 more questions in the actual test

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