Recommended PYQs (STRICTLY NCERT Based) Atoms Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Match List I with List II.

List I (Spectral Lines of Hydrogen for transitions from)		List II (Wavelength (nm))
$\mathrm{A.}$	$n_2=3$ to $n_1=2$	$\mathrm{I.}$	$410.2$
$\mathrm{B.}$	$n_2=4$ to $n_1=2$	$\mathrm{II.}$	$434.1$
$\mathrm{C.}$	$n_2=5$ to $n_1=2$	$\mathrm{III.}$	$656.3$
$\mathrm{D.}$	$n_2=6$ to $n_1=2$	$\mathrm{IV.}$	$486.1$

Choose the correct answer from the options given below:

1.	$\mathrm{A - III, B - IV, C - II, D - I}$
2.	$\mathrm{A - IV, B - III, C - I, D - II}$
3.	$\mathrm{A - I, B - II, C - III, D - IV}$
4.	$\mathrm{A - II, B - I, C - IV, D - III}$

Subtopic: Spectral Series |

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Q2:

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 element are stable and emit their characteristic spectrum.

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

1.	Both Statement I and Statement II are incorrect.
2.	Statement I is correct but Statement II is incorrect.
3.	Statement I is incorrect but Statement II is correct.
4.	Both Statement I and Statement II are correct.

Subtopic: Spectral Series |

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Q3:

Match List-I (Spectral Series) with List-II (corresponding wave number expressions).

	List-I (Series)		List-II (Wave number in $\text{cm}^{–1}$ )
A.	Balmer series	I.	$R\left(\dfrac{1}{1^2}-\dfrac{1}{n^2}\right)$
B.	Lyman series	II.	$R\left(\dfrac{1}{4^2}-\dfrac{1}{n^2}\right)$
C.	Brackett series	III.	$R\left(\dfrac{1}{5^2}-\dfrac{1}{n^2}\right)$
D.	Pfund series	IV.	$R\left(\dfrac{1}{2^2}-\dfrac{1}{n^2}\right)$

Choose the correct answer from the options given below:

1.	A-I, B-IV, C-III, D-II
2.	A-II, B-III, C-IV, D-I
3.	A-IV, B-I, C-II, D-III
4.	A-III, B-II, C-I, D-IV

Subtopic: Spectral Series |

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Q4:

The spectral series which corresponds to the electronic transition from the levels

n_{2} = 5, 6, \dots

${n}_{2}=5,6,\ldots$ to the level

n_{1} = 4

${n}_{1}=4\mathrm~$ is:

1.	Pfund series
2.	Brackett series
3.	Lyman series
4.	Balmer series

Subtopic: Spectral Series |

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Q5:

Some energy levels of a molecule are shown in the figure with their wavelengths of transitions.

Then:

1.	$\lambda_{3}>\lambda_{2},\lambda_{1}=2\lambda_{2}$	2.	$\lambda_{3}>\lambda_{2},\lambda_{1}=4\lambda_{2}$
3.	$\lambda_{1}>\lambda_{2},\lambda_{2}=2\lambda_{3}$	4.	$\lambda_{2}>\lambda_{1},\lambda_{2}=2\lambda_{3}$

Subtopic: Spectral Series |

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Q6:

In hydrogen spectrum, the shortest wavelength in the Balmer series is

λ

$\lambda$ . The shortest wavelength in the Bracket series is:
1.

16 λ

$16\lambda$
2.

2 λ

$2\lambda$
3.

4 λ

$4\lambda$
4.

9 λ

$9\lambda$

Subtopic: Spectral Series |

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Q7:

The radius of innermost orbit of a hydrogen atom is

5.3 \times 10^{- 11} m .

$5.3 \times 10^{-11}~\text m.$ What is the radius of the third allowed orbit of a hydrogen atom?
1.

4.77 \overset{˚}{A}

$4.77~ \mathring{A}$
2.

0.53 \overset{˚}{A}

$0.53~ \mathring{A}$
3.

1.06 \overset{˚}{A}

$1.06~ \mathring{A}$
4.

1.59 \overset{˚}{A}

$1.59~ \mathring{A}$

Subtopic: Bohr's Model of Atom |

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Q8:

The ground state energy of a hydrogen atom is

- 13.6 eV .

$-13.6~\text{eV}.$ The energy needed to ionize the hydrogen atom from its second excited state will be:
1.

13.6 eV

$13.6~\text{eV}$
2.

6.8 eV

$6.8~\text{eV}$
3.

1.51 eV

$1.51~\text{eV}$
4.

3.4 eV

$3.4~\text{eV}$

Subtopic: Bohr's Model of Atom |

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Q9:

The wavelength of the Lyman series of hydrogen atom appears in:

1.	visible region
2.	far infrared region
3.	ultraviolet region
4.	infrared region

Subtopic: Spectral Series |

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Q10:

The angular momentum of an electron moving in an orbit of a hydrogen atom is

1.5 (\frac{h}{π}) .

$1.5\left(\frac h\pi\right).$ The energy in the same orbit is nearly:

1.	$-1.5~\text{eV}$	2.	$-1.6~\text{eV}$
3.	$-1.3~\text{eV}$	4.	$-1.4~\text{eV}$

Subtopic: Bohr's Model of Atom |

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