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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 number of electrons present in {tex} \mathrm {\ell=2}{/tex} is

3

B

6

C

5

D

4

Explanation

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Q 9. 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 10. 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 11. 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 12. 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

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Q 13. Uncertainty in position of a minute particle of mass 25{tex} \mathrm { g } {/tex} in space is {tex} 10 ^ { - 5 } \mathrm { m } {/tex} . What is the uncertainty in its velocity {tex} \left( \text { in } \mathrm { ms } ^ { - 1 } \right) ? {/tex}

A

{tex} 2.1 \times 10 ^ { - 34 } {/tex}

B

{tex} 0.5 \times 10 ^ { - 34 } {/tex}

{tex} 2.1 \times 10 ^ { - 28 } {/tex}

D

{tex} 0.5 \times 10 ^ { - 23 } {/tex}

Explanation



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Q 14. According to Bohr's theory, the angular momentum of an electron in {tex} 5 ^ { \text {th } } {/tex} orbit is

A

{tex}10\ \mathrm { h } / \pi {/tex}

{tex}2.5\ \mathrm { h } / \pi {/tex}

C

{tex}25\ \mathrm { h } / \pi {/tex}

D

{tex}1.0\ \mathrm { h } / \pi {/tex}

Explanation





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Q 15. The number of d-electrons retained in {tex} \mathrm { Fe } ^ { 2 + } {/tex} (At. no of {tex} \mathrm { Fe } = 26 {/tex} ) ion is

A

4

B

5

6

D

3

Explanation

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Q 16. Which of the following is the energy of a possible excited state of hydrogen?

{tex}-3.4eV{/tex}

B

{tex}+6.8eV{/tex}

C

{tex}+13.6eV{/tex}

D

{tex}-6.8eV{/tex}

Explanation

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Q 17. In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen

5{tex} \rightarrow 2 {/tex}

B

4{tex} \rightarrow 1 {/tex}

C

2{tex} \rightarrow 5 {/tex}

D

3{tex} \rightarrow 2 {/tex}

Explanation



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Q 18. Of the following sets which one does NOT contain isoelectronic species?

A

{tex} \mathrm { BO } _ { 3 } ^ { 3 - } , \mathrm { CO } _ { 3 } ^ { 2 - } , \mathrm { NO } _ { 3 } ^ { - } {/tex}

{tex} \mathrm { SO } _ { 3 } ^ { 2 - } , \mathrm { CO } _ { 3 } ^ { 2 - } , \mathrm { NO } _ { 3 } ^ { - } {/tex}

C

{tex} \mathrm { CN } ^ { - } , \mathrm { N } _ { 2 } , \mathrm { C } _ { 2 } ^ { 2 - } {/tex}

D

{tex} \mathrm { PO } _ { 4 } ^ { 3 - } , \mathrm { SO } _ { 4 } ^ { 2 - } , \mathrm { ClO } _ { 4 } ^ { - } {/tex}

Explanation









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Q 19. In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields?
{tex} \begin{array} { l l } { \text { (A) } n = 1 , l = 0 , m = 0 } & { \text { (B) } n = 2 , l = 0 , m = 0 } \\ { \text { (C) } n = 2 , l = 1 , m = 1 } & { \text { (D) } n = 3 , l = 2 , m = 1 } \\ { \text { (E) } n = 3 , l = 2 , m = 0 } \end{array} {/tex}

(D) and (E)

B

(C) and (D)

C

(B) and (C)

D

(A) and (B)

Explanation

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Q 20. The orbital angular momentum for an electron revolving in an orbit is given by {tex} \sqrt { l ( l + 1 ) } \cdot \frac { \mathrm { h } } { 2 \pi } {/tex} . This momentum for an s-electron will be given by

Zero

B

{tex} \frac { h } { 2 \pi } {/tex}

C

{tex} \sqrt { 2 } \cdot \frac { \mathrm { h } } { 2 \pi } {/tex}

D

{tex} + \frac { 1 } { 2 } \cdot \frac { \mathrm { h } } { 2 \pi } {/tex}

Explanation

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Q 21. Which one of the following constitutes a group of the isoelectronic species?

A

{tex} \mathrm { C } _ { 2 } ^ { 2 - } , \mathrm { O } _ { 2 } ^ { - } , \mathrm { CO } , \mathrm { NO } {/tex}

{tex} \mathrm { NO } ^ { + } , \mathrm { C } _ { 2 } ^ { 2 - } , \mathrm { CN } ^ { - } , \mathrm { N } _ { 2 } {/tex}

C

{tex} \mathrm { CN } ^ { - } , \mathrm { N } _ { 2 } , \mathrm { O } _ { 2 } ^ { 2 - } , \mathrm { C } _ { 2 } ^ { 2 - } {/tex}

D

{tex} \mathrm { N } _ { 2 } , \mathrm { O } _ { 2 } ^ { - } , \mathrm { NO } ^ { + } , \mathrm { CO } {/tex}

Explanation





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Q 22. Which one of the following groupings represents a collection of isoelectronic species ?{tex} ( \text { At. nos.: } \mathrm { Cs } : 55 , {/tex} {tex} \mathrm { Br } : 35 ) {/tex}

{tex} \mathbf { N } ^ { 3 - } , \mathbf { F } ^ { - } , \mathbf { N a } ^ { + } {/tex}

B

{tex} \mathrm { Be } , \mathrm { Al } ^ { 3 + } , \mathrm { Cl } ^ { - } {/tex}

C

{tex} \mathrm { Ca } ^ { 2 + } , \mathrm { Cs } ^ { + } , \mathrm { Br } {/tex}

D

{tex} \mathrm { Na } ^ { + } , \mathrm { Ca } ^ { 2 + } , \mathrm { Mg } ^ { 2 + } {/tex}

Explanation

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Q 23. In an atom, an electron is moving with a speed of {tex} 600\,\ \mathrm { m } / \mathrm { s } {/tex} with an accuracy of {tex}0.005 \% {/tex} . Certainity with which the
position of the electron can be located is {tex} ( \mathrm { h } = 6.6 \times 10 ^ { - 34 } \mathrm { kg }{/tex} .{tex} \mathrm { m } ^ { 2 } \mathrm { s } ^ { - 1 } , \text { mass of electron, } \mathrm { e } _ { \mathrm { m } } = 9.1 \times 10 ^ { - 31 } \mathrm { kg )} {/tex} :

A

{tex} 5.10 \times 10 ^ { - 3 } \mathrm { m } {/tex}

{tex} 1.92 \times 10 ^ { - 3 } \mathrm { m } {/tex}

C

{tex} 3.84 \times 10 ^ { - 3 } \mathrm { m } {/tex}

D

{tex} 1.52 \times 10 ^ { - 4 } \mathrm { m } {/tex}

Explanation



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Q 24. The energy required to break one mole of {tex} \mathrm { Cl } - \mathrm { Cl } {/tex} bonds in {tex} \mathrm { Cl } _ { 2 } {/tex} is {tex}242\ \mathrm { kJ } \mathrm { mol } ^ { - 1 } {/tex} . The longest wavelength of light capable of breaking a single {tex} \mathrm { Cl } - \mathrm { Cl } {/tex} bond is
{tex} \left( c = 3 \times 10 ^ { 8 } \mathrm { ms } ^ { - 1 } \text { and } N _ { A } = 6.02 \times 10 ^ { 23 } \mathrm { mol } ^ { - 1 } \right) {/tex}

A

{tex}594 \mathrm { nm } {/tex}

B

{tex}640 \mathrm { nm } {/tex}

C

{tex}700 \mathrm { nm } {/tex}

{tex} 494\mathrm { nm } {/tex}

Explanation





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Q 25. Which of the following sets of quantum numbers represents the highest energy of an atom?

A

{tex} \mathrm { n } = 3,1 = 0 , \mathrm { m } = 0 , \mathrm { s } = + 1 / 2 {/tex}

B

{tex} \mathrm { n } = 3,1 = 1 , \mathrm { m } = 1 , \mathrm { s } = + 1 / 2 {/tex}

{tex} \mathrm { n } = 3,1 = 2 , \mathrm { m } = 1 , \mathrm { s } = + 1 / 2 {/tex}

D

{tex} \mathrm { n } = 4,1 = 0 , \mathrm { m } = 0 , \mathrm { s } = + 1 / 2 {/tex}

Explanation