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NEET • CHEMISTRY • STRUCTURE OF ATOM

Structure of atom practice · Mixed difficulty

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481 Medium

481 of 492

Remembering +4 | -1

Number of waves in fourth orbit

View answer and explanation

Correct option: A

Option A (4) is correct because the number of waves in the nth orbit is equal to n. Therefore, in the fourth orbit, there are 4 waves.

482 Medium

482 of 492

Understanding +4 | -1

In photoelectric effect, at which frequency electron will be ejected with certain kinetic energy

\left(v_0=\right.

threshold frequency).

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Correct option: A

v>v_0

Option A is correct. For electron ejection with kinetic energy, the frequency of incident light must be greater than the threshold frequency.

483 Easy

483 of 492

Remembering +4 | -1

Compared to the mass of lightest nuclei, the mass of an electron is only (app.)

View answer and explanation

Correct option: C

\frac{1}{{1800}}

Option C (

\frac{1}{{1800}}

) is correct because the mass of an electron is approximately 1/1836th of the mass of a proton (or a neutron), which are the lightest nuclei.

484 Hard

484 of 492

Analyzing +4 | -1

Which of the following quantity for an electron revolving around the

\mathrm{H}

-nucleus is independent to the mass of electron?

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Correct option: D

Speed

Option D (Speed) is correct. The speed of an electron in a Bohr orbit depends on the atomic number Z and the principal quantum number n, but not directly on the mass of the electron.

485 Medium

485 of 492

Understanding +4 | -1

Which are in the ascending order of wavelength?

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Correct option: B

Lyman limit, Balmer limit, Paschen limit in the hydrogen spectrum

Option B (Lyman limit, Balmer limit, Paschen limit in the hydrogen spectrum) is correct because the wavelengths of the series limits increase in the order Lyman < Balmer < Paschen.

486 Medium

486 of 492

Understanding +4 | -1

Which element possess non-spherical shells?

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Correct option: B

Option B (B) is correct because Boron (B) has the electronic configuration

1s^22s^22p^1

, and the presence of electrons in the p-orbital results in non-spherical shells.

487 Hard

487 of 492

Understanding +4 | -1

Assertion : The neutrons are better initiators of nuclear reactions, than the protons, deutrons or

\alpha

particles of the same energy.

Reason : Neutrons are uncharged particles and hence, they are not repelled by positively charged nucleus.

View answer and explanation

Correct option: A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

Option A is correct because neutrons are uncharged and thus not repelled by the nucleus, making them effective initiators of nuclear reactions.

488 Medium

488 of 492

Understanding +4 | -1

Number of electrons in

- \mathrm{CON}{\mathrm{H}_2}

are

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Correct option: A

Option A (24) is correct because -CONH₂ has 1 carbon (6 electrons), 1 oxygen (8 electrons), 1 nitrogen (7 electrons), and 2 hydrogens (2 electrons), totaling 6 + 8 + 7 + 2 + 1 (for the negative charge) = 24 electrons.

489 Hard

489 of 492

Application +4 | -1

The

{Li}^{2+}

ion is moving in the third stationary state, and its linear momentum is

7.3 \times 10^{-34} {~kg} {~ms}^{-1}

. Calculate its angular momentum.

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Correct option: B

11.58 \times 10^{-48} {~kg} {~m}^2 {~s}^{-1}

Option B (

11.58 \times 10^{-48} {~kg} {~m}^2 {~s}^{-1}

) is correct because angular momentum is calculated using the formula L = n*h/(2*pi), where n is the energy level.

490 Easy

490 of 492

Analyzing +4 | -1

Consider the species

\mathrm{CH}_4, \mathrm{NH}_4^{+}

and

\mathrm{BH}_4^{-}

. Choose the correct option with respect to these species.

View answer and explanation

Correct option: B

They are isoelectronic and all have tetrahedral structures.

Option B (They are isoelectronic and all have tetrahedral structures) is correct because all three species have 8 valence electrons and four bond pairs, resulting in a tetrahedral geometry.

491 Easy

491 of 492

Application +4 | -1

The total number of valency electrons for

\mathrm{NH}_4^ +

is :

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Correct option: B

Option B (8) is correct because nitrogen has 5 valence electrons, each hydrogen has 1, and the +1 charge means one electron is removed: 5 + (4*1) - 1 = 8.

492 Medium

492 of 492

Analyzing +4 | -1

For given transitions order of wavelength of photon emitted will be :-

(A)

6 \rightarrow 4

(B)

4 \rightarrow 2

(C)

3 \rightarrow 1

(D)

2 \rightarrow 1

View answer and explanation

Correct option: B

\lambda_{\mathrm{C}}<\lambda_{\mathrm{D}}<\lambda_{\mathrm{B}}<\lambda_{\mathrm{A}}

Option A (

\lambda_{\mathrm{C}}>\lambda_{\mathrm{D}}>\lambda_{\mathrm{B}}>\lambda_{\mathrm{A}}

) is correct because the wavelength is inversely proportional to the energy difference between the levels, and the energy differences follow the order C < D < B < A.

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Review STRUCTURE OF ATOM in your textbook or class notes, then use this set to check your understanding.

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Structure of atom practice · Mixed difficulty

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