NEET Previous Year Questions on Atoms

Q 1 :
Given below are two statements:

Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges.

Statement II: Atoms of each elements are stable and emit their characteristic spectrum.

In the light of the above statements, choose the most appropriate answer from the options given below: [2024]

Both statement I and statement II are correct.
Both Statement I and statement II are incorrect.
Statement I is correct but statement II is incorrect.
Statement I is incorrect but statement II is correct.

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2

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4

(3)

Atoms are electrically neutral as they have equal numbers of protons or positive charge and electrons or negative charge i.e., the overall charge on an atom is zero.
Atoms of each elements are not stable since there exists some radioactive elements also.

Q 2 :
The wavelength of Lyman series of hydrogen atom appears in [2023]

visible region
Far infrared region
ultra violet region
Infrared region

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4

(3)

Q 3 :
The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is [2017]

1
4
0.5
2

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2

3

4

(2)

The wavelength of last line of Balmer series

$\frac{1}{λ_{B}} = R (\frac{1}{2^{2}} - \frac{1}{\infty^{2}}) = \frac{R}{4}$

The wavelength of last line of Lyman series

$\frac{1}{λ_{L}} = R (\frac{1}{1^{2}} - \frac{1}{\infty^{2}}) = R$ $∴$ $\frac{λ_{B}}{λ_{L}} = \frac{4}{1} = 4$

Q 4 :
Given the value of Rydberg constant is $10^{7}$ $m^{- 1}$ , the wave number of the last line of the Balmer series in hydrogen spectrum will be [2016]

$0.25 \times 10^{7}$ $m^{- 1}$
$2.5 \times 10^{7}$ $m^{- 1}$
$0.025 \times 10^{4}$ $m^{- 1}$
$0.5 \times 10^{7}$ $m^{- 1}$

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(1)

Here, $R = 10^{7}$ $m^{- 1}$

The wave number of the last line of the Balmer series in hydrogen spectrum is given by

$\frac{1}{λ} = R (\frac{1}{2^{2}} - \frac{1}{\infty^{2}}) = \frac{R}{4} = \frac{10^{7}}{4} = 0.25 \times 10^{7}$ $m^{- 1}$

Topic Question Set

Q 2 :
The wavelength of Lyman series of hydrogen atom appears in [2023]

(3)

Q 3 :
The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is [2017]

Q 4 :
Given the value of Rydberg constant is $10^{7}$ $m^{- 1}$ , the wave number of the last line of the Balmer series in hydrogen spectrum will be [2016]

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Topic Question Set

Q 2 : The wavelength of Lyman series of hydrogen atom appears in [2023]

(3)

Q 3 : The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is [2017]

Q 4 : Given the value of Rydberg constant is 107 m-1, the wave number of the last line of the Balmer series in hydrogen spectrum will be [2016]

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Q 2 :
The wavelength of Lyman series of hydrogen atom appears in [2023]

Q 3 :
The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is [2017]

Q 4 :
Given the value of Rydberg constant is $10^{7}$ $m^{- 1}$ , the wave number of the last line of the Balmer series in hydrogen spectrum will be [2016]