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Explore popular questions from Structure of Atom for JEE Main. This collection covers Structure of Atom previous year JEE Main questions hand picked by experienced teachers.

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Structure of Atom

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Q 1. The energy of hydrogen atom in its ground state is {tex} \mathrm { - 13.6eV} {/tex} . The energy of the level corresponding to {tex} n = 5 {/tex}

{tex} - 0.54 \mathrm { eV } {/tex}

B

{tex} - 5.40 \mathrm { eV } {/tex}

C

{tex} - 0.85 \mathrm { eV } {/tex}

D

{tex} - 2.72 \mathrm { eV } {/tex}

Explanation

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Q 2. The spectrum of {tex} \mathrm { He } ^ { + } {/tex} is expected to be similar to that of

{tex} \mathrm{ L } \mathrm { i } {/tex}

B

{tex} \mathrm { He } {/tex}

C

{tex} \mathrm { H} {/tex}

D

{tex} \mathrm { Na } {/tex}

Explanation


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Q 3. What possibly can be the ratio of the de Broglie wavelength for two electrons having the same initial energy and accelerated through 50 volts and 200 volts?

A

{tex} 3 : 10 {/tex}

B

{tex} 10 : 3 {/tex}

C

{tex} 1 : 2 {/tex}

{tex} 2 : 1 {/tex}

Explanation

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Q 4. The uncertainty in the momentum of an electron is {tex} 1.0 \times 10 ^ { - 5 } \mathrm { kg } \mathrm { m } \mathrm { s } ^ { - 1 } {/tex} . The uncertainty of its position will be {tex} \left( h = 6.626 \times 10 ^ { - 34 } \mathrm { kg } \mathrm { m } ^ { 2 } \mathrm { s } ^ { - 1 } \right) {/tex}

A

{tex} 1.05 \times 10 ^ { - 28 } \mathrm { m } {/tex}

B

{tex} 1.05 \times 10 ^ { - 30 } \mathrm { m } {/tex}

{tex} 5.27 \times 10 ^ { - 30 } \mathrm { m } {/tex}

D

{tex} 5.25 \times 10 ^ { - 28 } \mathrm { m } {/tex}

Explanation

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Q 5. The orbital with zero angular momentum is

{tex}S{/tex}

B

{tex} P {/tex}

C

{tex} D {/tex}

D

{tex} F {/tex}

Explanation

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Q 6. The electronic configuration of the {tex} \mathrm { Mn } ^ { 4 + } {/tex} ion is

A

3{tex} d ^ { 4 } 4 s ^ { 0 } {/tex}

B

3{tex} d ^ { 2 } 4 s ^ { 1 } {/tex}

C

3{tex} d ^ { 1 } 4 s ^ { 2 } {/tex}

3{tex} d ^ { 3 } 4 s ^ { 0 } {/tex}

Explanation


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Q 7. Which of the following ions has the maximum number of unpaired {tex} d {/tex} -electrons?

A

{tex}\mathrm {Z n} ^ { 2 + } {/tex}

{tex} \mathrm {F e} ^ { 2 +} {/tex}

C

{tex} \mathrm { Ni } ^ { 3 + } {/tex}

D

{tex} \mathrm { Cu } ^ { + } {/tex}

Explanation


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Q 8. The total spin resulting from a {tex} d ^ { 7 } {/tex} configuration is

A

1

B

2

C

5/2

3/2

Explanation


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Q 9.
The number of electrons present in {tex} \mathrm {\ell=2}{/tex} is

3

B

6

C

5

D

4

Explanation

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Q 10. The value {tex} l {/tex} and {tex} m {/tex} for the last electron in the {tex} C l ^ { - } {/tex} ion are

A

1 and 2

B

2 and + 1

C

3 and - 1

1 and - 1

Explanation


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Q 11. The third line in Balmer series corresponds to an electronic transition between which Bohr's orbits in hydrogen?

A

{tex} 5\rightarrow 3 {/tex}

{tex}5 \rightarrow 2 {/tex}

C

{tex}4 \rightarrow 3 {/tex}

D

{tex}4 \rightarrow 2 {/tex}

Explanation


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Q 12. Correct set of four quantum numbers for valence electron of rubidium {tex} ( Z = 37 ) {/tex} is

{tex} 5,0,0 , + \frac { 1 } { 2 } {/tex}

B

{tex} 5,1,0 , + \frac { 1 } { 2 } {/tex}

C

{tex} 5,1,1 , + \frac { 1 } { 2 } {/tex}

D

{tex} 6,0,0 , + \frac { 1 } { 2 } {/tex}

Explanation

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Q 13. Which of the following sets of quantum numbers represents an impossible arrangement for the following respectively?
{tex} \begin{array} { c l } { n } & { l } & { m } & { s } \end{array} {/tex}

A

{tex} 3 \quad 2 \quad -2 \quad \frac { 1 } { 2 } {/tex}

B

{tex} 4 \quad\, 0 \quad \,0 \quad \frac { 1 } { 2 } {/tex}

{tex} 3 \quad 2 \quad -3 \quad \frac { 1 } { 2 } {/tex}

D

{tex} 5\quad 3 \quad 0 \quad \frac { 1 } { 2 } {/tex}

Explanation

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Q 14. The electronic configuration of an element is {tex} 15 ^ { 2 } 2 s ^ { 2 } {/tex} {tex} 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 3 d ^ { 5 } 4 s ^ { 1 } . {/tex} This represents its

A

Excited state

Ground state or cationic form

C

Cationic form only

D

None of these

Explanation