NEET Chemistry: Structure of Atom — MCQ Test 19

Q6. The ratio of the kinetic energies of an electron in the first orbit of \( \text{Li}^{2+} \) to the second orbit of \( \text{H} \) is: (\( v_1 \) for H = \( 2.19 \times 10^6 \, \text{m s}^{-1} \), \( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q7. The ratio of the radii of the second orbit of \( \text{H} \) to the first orbit of \( \text{Li}^{2+} \) is:

Q8. An element has 15 protons, 16 neutrons, and 18 electrons. What is the charge and mass number of the ion?

Q9. How many electrons in an atom can have the quantum numbers \( n = 3 \) and \( m_s = +1/2 \)?

Q10. A metal has a work function of \( 3.0 \, \text{eV} \). What is the stopping potential when irradiated with light of wavelength \( 300 \, \text{nm} \)? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( c = 3.0 \times 10^8 \, \text{m s}^{-1} \), \( e = 1.6 \times 10^{-19} \, \text{C} \), \( 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} \))

NEET Chemistry — Structure of Atom

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Which series of spectral lines in a hydrogen atom lies in the visible region?

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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 Spectral, Hydrogen, Electron, Momentum, Possible, and Required.

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Preview of Questions in this Test

Q1.

Which series of spectral lines in a hydrogen atom lies in the visible region?

  • A.

    Lyman series

  • B.

    Paschen series

  • C.

    Balmer series

  • D.

    Brackett series

Q2.

An electron in He+\text{He}^+ has an angular momentum of 3.165×10−34 J s3.165 \times 10^{-34} \, \text{J s}. What is its kinetic energy? (h=6.626×10−34 J sh = 6.626 \times 10^{-34} \, \text{J s}, me=9.1×10−31 kgm_e = 9.1 \times 10^{-31} \, \text{kg})

  • A.

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

  • B.

    4.85×10−19 J4.85 \times 10^{-19} \, \text{J}

  • C.

    1.94×10−18 J1.94 \times 10^{-18} \, \text{J}

  • D.

    9.7×10−19 J9.7 \times 10^{-19} \, \text{J}

Q3.

An electron in a multi-electron atom has quantum numbers n=4,l=2n = 4, l = 2. How many possible values of mlm_l can it have?

  • A.

    3

  • B.

    7

  • C.

    4

  • D.

    5

Q4.

The energy required to eject an electron from a metal is 4.5×10−19 J4.5 \times 10^{-19} \, \text{J}. If light of frequency 8.0×1014 Hz8.0 \times 10^{14} \, \text{Hz} is used, what is the kinetic energy of the ejected electron? (h=6.626×10−34 J sh = 6.626 \times 10^{-34} \, \text{J s})

  • A.

    4.5×10−19 J4.5 \times 10^{-19} \, \text{J}

  • B.

    5.3008×10−19 J5.3008 \times 10^{-19} \, \text{J}

  • C.

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

  • D.

    8.008×10−20 J8.008 \times 10^{-20} \, \text{J}

Q5.

The uncertainty in position of a proton is 5.0×10−11 m5.0 \times 10^{-11} \, \text{m}. What is the minimum uncertainty in its velocity? (h=6.626×10−34 J sh = 6.626 \times 10^{-34} \, \text{J s}, mp=1.67×10−27 kgm_p = 1.67 \times 10^{-27} \, \text{kg})

  • A.

    3.15×102 m s−13.15 \times 10^2 \, \text{m s}^{-1}

  • B.

    1.26×103 m s−11.26 \times 10^3 \, \text{m s}^{-1}

  • C.

    6.3×102 m s−16.3 \times 10^2 \, \text{m s}^{-1}

  • D.

    9.45×102 m s−19.45 \times 10^2 \, \text{m s}^{-1}

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