NEET Chemistry: Structure of Atom — MCQ Test 14

Q6. An electron and an alpha particle have the same de Broglie wavelength. What is the ratio of their velocities? (\( m_e = 9.1 \times 10^{-31} \, \text{kg} \), \( m_{\alpha} = 6.64 \times 10^{-27} \, \text{kg} \))

Q7. How many possible sets of quantum numbers (\( n, l, m_l, m_s \)) are there for electrons in the \( n = 4 \) energy level?

Q8. The ratio of the kinetic energies of an electron in the second orbit of \( \text{He}^+ \) to the third orbit of \( \text{H} \) is: (\( v_1 \) for H = \( 2.19 \times 10^6 \, \text{m s}^{-1} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q9. The de Broglie wavelength of a proton moving at \( 1.0 \times 10^6 \, \text{m s}^{-1} \) is: (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_p = 1.67 \times 10^{-27} \, \text{kg} \))

Q10. An ion has 17 protons and 18 electrons. What is its charge?

NEET Chemistry — Structure of Atom

Free MCQ Test 14 of 20

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The electronic configuration of an element is 1s22s22p63s23p31s^2 2s^2 2p^6 3s^2 3p^3. What is the atomic number of this element?

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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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Medium
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Key concepts covered in this specific test include Electronic, Configuration, Neutrons, Required, Electron, 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.

The electronic configuration of an element is 1s22s22p63s23p31s^2 2s^2 2p^6 3s^2 3p^3. What is the atomic number of this element?

  • A.

    13

  • B.

    17

  • C.

    10

  • D.

    15

Q2.

An element has 20 protons and 20 neutrons. What is its atomic mass number?

  • A.

    20

  • B.

    30

  • C.

    50

  • D.

    40

Q3.

The energy required to excite an electron from n=2n = 2 to n=5n = 5 in a hydrogen atom is 4.896×10−19 J 4.896 \times 10^{-19} \, \text{J}. What is the wavelength of the absorbed photon? (h=6.626×10−34 J sh = 6.626 \times 10^{-34} \, \text{J s}, c=3.0×108 m s−1c = 3.0 \times 10^8 \, \text{m s}^{-1})

  • A.

    486.1 nm486.1 \, \text{nm}

  • B.

    656.3 nm656.3 \, \text{nm}

  • C.

    406.1 nm406.1 \, \text{nm}

  • D.

    364.6 nm364.6 \, \text{nm}

Q4.

The ratio of the wavelengths of the first lines in the Lyman and Balmer series of a hydrogen atom is: (RH=1.097×107 m−1R_H = 1.097 \times 10^7 \, \text{m}^{-1})

  • A.

    5.45.4

  • B.

    0.1850.185

  • C.

    2.72.7

  • D.

    1.01.0

Q5.

The ratio of the radii of the fourth orbit of H\text{H} to the third orbit of Be3+\text{Be}^{3+} is: (r1r_1 for H = 5.29×10−11 m5.29 \times 10^{-11} \, \text{m})

  • A.

    4.04.0

  • B.

    7.117.11

  • C.

    2.252.25

  • D.

    9.09.0

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