NEET Chemistry: Structure of Atom — MCQ Test 18

Q6. Which of the following radiations has the highest frequency?

Q7. Which of the following has the same number of neutrons as an atom with 12 protons and mass number 24?

Q8. The ionization energy of \( \text{Li}^{2+} \) is \( 122.4 \, \text{eV} \). What is the wavelength of light required to excite an electron from \( n = 1 \) to \( n = 3 \) in \( \text{Li}^{2+} \)? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( c = 3.0 \times 10^8 \, \text{m s}^{-1} \), \( 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} \))

Q9. The ratio of the kinetic energy of an electron in the first orbit of \( \text{H} \) to the second orbit of \( \text{He}^+ \) is: (\( v_1 \) for H = \( 2.19 \times 10^6 \, \text{m s}^{-1} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q10. The uncertainty in position of an electron is \( 2.0 \times 10^{-10} \, \text{m} \). What is the minimum uncertainty in its momentum? (\( h = 6.626 \times 10^{-34} \, \text{J s} \))

NEET Chemistry — Structure of Atom

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The frequency of a photon is \( 7.5 \times 10^{14} \, \text{Hz} \). What is its energy in joules? (\( h = 6.626 \times 10^{-34} \, \text{J s} \))

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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 Frequency, Uncertainty, Velocity, Position, Function, 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 frequency of a photon is \( 7.5 \times 10^{14} \, \text{Hz} \). What is its energy in joules? (\( h = 6.626 \times 10^{-34} \, \text{J s} \))

  • A. \( 4.9695 \times 10^{-19} \, \text{J} \)
  • B. \( 3.313 \times 10^{-19} \, \text{J} \)
  • C. \( 6.626 \times 10^{-19} \, \text{J} \)
  • D. \( 2.48475 \times 10^{-19} \, \text{J} \)

Q2. The uncertainty in velocity of a proton is \( 2.0 \times 10^5 \, \text{m s}^{-1} \). What is the minimum uncertainty in its position? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_p = 1.67 \times 10^{-27} \, \text{kg} \))

  • A. \( 3.16 \times 10^{-13} \, \text{m} \)
  • B. \( 7.9 \times 10^{-14} \, \text{m} \)
  • C. \( 5.27 \times 10^{-13} \, \text{m} \)
  • D. \( 1.58 \times 10^{-13} \, \text{m} \)

Q3. A metal has a work function of \( 3.2 \, \text{eV} \). What is the kinetic energy of an electron ejected by light of wavelength \( 350 \, \text{nm} \)? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( c = 3.0 \times 10^8 \, \text{m s}^{-1} \), \( 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} \))

  • A. \( 5.6794 \times 10^{-19} \, \text{J} \)
  • B. \( 5.5936 \times 10^{-20} \, \text{J} \)
  • C. \( 2.0858 \times 10^{-19} \, \text{J} \)
  • D. \( 3.9756 \times 10^{-19} \, \text{J} \)

Q4. The energy of an electron in the second orbit of a hydrogen atom is \( -5.45 \times 10^{-19} \, \text{J} \). What is its energy in the fourth orbit?

  • A. \( -1.3625 \times 10^{-19} \, \text{J} \)
  • B. \( -2.725 \times 10^{-19} \, \text{J} \)
  • C. \( -5.45 \times 10^{-19} \, \text{J} \)
  • D. \( -8.72 \times 10^{-19} \, \text{J} \)

Q5. An electron in a hydrogen atom is excited to \( n = 4 \). How many possible emission lines can it produce?

  • A. 4
  • B. 5
  • C. 6
  • D. 3

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