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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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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10
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Key concepts covered in this specific test include Hydrogen, Photoelectron, Wavelength, Function, Frequency, and Calculate.

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.

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 1.5×10−19 J1.5 \times 10^{-19} \, \text{J} when light of wavelength 400 nm400 \, \text{nm} is used. What is the work function? (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.

    1.5×10−19 J1.5 \times 10^{-19} \, \text{J}

  • B.

    4.9695×10−19 J4.9695 \times 10^{-19} \, \text{J}

  • C.

    2.6504×10−19 J2.6504 \times 10^{-19} \, \text{J}

  • D.

    3.4695×10−19 J3.4695 \times 10^{-19} \, \text{J}

Q3.

The energy of a photon is given by E=hvE = h v, where h=6.626×10−34 J sh = 6.626 \times 10^{-34} \, \text{J s} and frequency v=4.0×1014 Hzv = 4.0 \times 10^{14} \, \text{Hz}. Calculate the energy in joules.

  • A.

    2.6504×10−19 J2.6504 \times 10^{-19} \, \text{J}

  • B.

    1.3252×10−19 J1.3252 \times 10^{-19} \, \text{J}

  • C.

    4.9755×10−19 J4.9755 \times 10^{-19} \, \text{J}

  • D.

    6.626×10−19 J6.626 \times 10^{-19} \, \text{J}

Q4.

How many possible values of msm_s are there for an electron with n=4,l=2,ml=1n = 4, l = 2, m_l = 1?

  • A.

    1

  • B.

    4

  • C.

    2

  • D.

    5

Q5.

An electron jumps from n=4n = 4 to n=1n = 1 in a hydrogen atom. What is the energy of the emitted photon? (E1=−2.18×10−18 JE_1 = -2.18 \times 10^{-18} \, \text{J})

  • A.

    2.04375×10−18 J2.04375 \times 10^{-18} \, \text{J}

  • B.

    1.635×10−18 J1.635 \times 10^{-18} \, \text{J}

  • C.

    2.18×10−18 J2.18 \times 10^{-18} \, \text{J}

  • D.

    1.3625×10−18 J1.3625 \times 10^{-18} \, \text{J}

+ 5 more questions in the actual test

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