NEET Chemistry: Structure of Atom — MCQ Test 16

Q6. How many orbitals in an atom can have the quantum numbers \( n = 4 \) and \( l = 3 \)?

Q7. An atom has 32 protons, 38 neutrons, and 30 electrons. What is its mass number and charge?

Q8. Which transition in a hydrogen atom corresponds to the emission in the ultraviolet region?

Q9. The velocity of an electron in the first orbit of a hydrogen atom is \( 2.19 \times 10^6 \, \text{m s}^{-1} \). What is its velocity in the third orbit?

Q10. An atom has 20 protons, 22 neutrons, and 18 electrons. What is its mass number and charge?

NEET Chemistry — Structure of Atom

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An electron in \( \text{Be}^{3+} \) has an angular momentum of \( 6.33 \times 10^{-34} \, \text{J s} \). What is its energy? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( E_1 \) for H = \( -2.18 \times 10^{-18} \, \text{J} \))

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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, Frequency, Determines, Neutrons, and Electrons.

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 \( \text{Be}^{3+} \) has an angular momentum of \( 6.33 \times 10^{-34} \, \text{J s} \). What is its energy? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( E_1 \) for H = \( -2.18 \times 10^{-18} \, \text{J} \))

  • A. \( -2.42 \times 10^{-18} \, \text{J} \)
  • B. \( -3.871 \times 10^{-18} \, \text{J} \)
  • C. \( -1.089 \times 10^{-18} \, \text{J} \)
  • D. \( -9.6778 \times 10^{-19} \, \text{J} \)

Q2. The angular momentum of an electron in the fourth orbit of \( \text{He}^+ \) is \( 4.22 \times 10^{-34} \, \text{J s} \). What is the frequency of the photon emitted when it falls to the second orbit? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( E_1 \) for H = \( -2.18 \times 10^{-18} \, \text{J} \))

  • A. \( 2.467 \times 10^{15} \, \text{Hz} \)
  • B. \( 3.291 \times 10^{15} \, \text{Hz} \)
  • C. \( 1.645 \times 10^{15} \, \text{Hz} \)
  • D. \( 4.935 \times 10^{15} \, \text{Hz} \)

Q3. Which quantum number determines the shape of an orbital?

  • A. Principal quantum number (\( n \))
  • B. Magnetic quantum number (\( m_l \))
  • C. Azimuthal quantum number (\( l \))
  • D. Spin quantum number (\( m_s \))

Q4. An atom has 26 protons, 30 neutrons, and 24 electrons. What is its mass number and charge?

  • A. \( 56, -2 \)
  • B. \( 54, +2 \)
  • C. \( 56, +2 \)
  • D. \( 54, -2 \)

Q5. The energy of an electron in the second orbit of \( \text{He}^+ \) is \( -13.6 \, \text{eV} \). What is the ionization energy from the fourth orbit? (\( 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} \))

  • A. \( 13.6 \, \text{eV} \)
  • B. \( 3.4 \, \text{eV} \)
  • C. \( 6.8 \, \text{eV} \)
  • D. \( 54.4 \, \text{eV} \)

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