NEET Chemistry: Structure of Atom — MCQ Test 7

Q6. A neutron has a de Broglie wavelength of \( 3.0 \times 10^{-12} \, \text{m} \). What is its kinetic energy? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_n = 1.67 \times 10^{-27} \, \text{kg} \))

Q7. The radius of the first orbit of \( \text{Li}^{2+} \) is \( 1.763 \times 10^{-11} \, \text{m} \). What is the kinetic energy of an electron in the third orbit? (\( v_1 \) for H = \( 2.19 \times 10^6 \, \text{m s}^{-1} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q8. An alpha particle and a proton have the same kinetic energy. What is the ratio of their de Broglie wavelengths? (\( m_p = 1.67 \times 10^{-27} \, \text{kg} \), \( m_{\alpha} = 6.64 \times 10^{-27} \, \text{kg} \))

Q9. An electron in \( \text{Li}^{2+} \) has a de Broglie wavelength of \( 2.21 \times 10^{-10} \, \text{m} \) in the second orbit. What is its kinetic energy? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q10. The angular momentum of an electron in the sixth orbit of a hydrogen atom is \( 6.33 \times 10^{-34} \, \text{J s} \). What is its energy? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( E_1 = -2.18 \times 10^{-18} \, \text{J} \))

NEET Chemistry — Structure of Atom

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What is the radius ratio of the third orbit to the first orbit in a hydrogen atom?

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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, Photoelectron, Wavelength, Function, Frequency, and Calculate.

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Preview of Questions in this Test

Q1. What is the radius ratio of the third orbit to the first orbit in a hydrogen atom?

  • A. 4
  • B. 9
  • C. 3
  • D. 6

Q2. The kinetic energy of a photoelectron is \( 1.5 \times 10^{-19} \, \text{J} \) when light of wavelength \( 400 \, \text{nm} \) is used. What is the work function? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( c = 3.0 \times 10^8 \, \text{m s}^{-1} \))

  • A. \( 1.5 \times 10^{-19} \, \text{J} \)
  • B. \( 4.9695 \times 10^{-19} \, \text{J} \)
  • C. \( 2.6504 \times 10^{-19} \, \text{J} \)
  • D. \( 3.4695 \times 10^{-19} \, \text{J} \)

Q3. The energy of a photon is given by \( E = h v \), where \( h = 6.626 \times 10^{-34} \, \text{J s} \) and frequency \( v = 4.0 \times 10^{14} \, \text{Hz} \). Calculate the energy in joules.

  • A. \(2.6504 \times 10^{-19} \, \text{J}\)
  • B. \(1.3252 \times 10^{-19} \, \text{J}\)
  • C. \(4.9755 \times 10^{-19} \, \text{J}\)
  • D. \(6.626 \times 10^{-19} \, \text{J}\)

Q4. How many possible values of \( m_s \) are there for an electron with \( n = 4, l = 2, m_l = 1 \)?

  • A. 1
  • B. 4
  • C. 2
  • D. 5

Q5. An electron jumps from \( n = 4 \) to \( n = 1 \) in a hydrogen atom. What is the energy of the emitted photon? (\( E_1 = -2.18 \times 10^{-18} \, \text{J} \))

  • A. \( 2.04375 \times 10^{-18} \, \text{J} \)
  • B. \( 1.635 \times 10^{-18} \, \text{J} \)
  • C. \( 2.18 \times 10^{-18} \, \text{J} \)
  • D. \( 1.3625 \times 10^{-18} \, \text{J} \)

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