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CHXI02:STRUCTURE OF ATOM

307308 Assertion :
The Mo $(Z = 42)$ atom has six unpaired electrons.
Reason :
Half-filled s-orbital has greater stability.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

The electronic configuration of Molybdenum (Mo) is $[Kr] 4 d^{5} 5 s^{1}$ . In this configuration, there are six unpaired electrons. In the case of molybdenum, it has one unpaired electron in the $5 s$ orbital, which is not fully filled. A fully filled s-orbital is more stable. So option (3) is correct.

CHXI02:STRUCTURE OF ATOM

307309 The electronic configuration of a dipositive ion $M^{2 +}$ is $2, 8, 14$ and its mass number is 56 .The number of neutrons in $M$ present is

1 32

2 42

3 30

4 34

Explanation:

Number of electrons in
$M^{2 +} = 2 + 8 + 14 = 24$
$∴$ Number of electrons in $M = 26$
i.e., atomic number Z=26
Mass number $(A) = 56$
$∴$ Number of neutrons A - Z = 56 -26 =30

CHXI02:STRUCTURE OF ATOM

307310 Assertion :
The electronic configuration of the nitrogen atom is represented as shown in below figure.
Reason :
The electronic configuration of the ground state of an atom is the one which has the greatest multiplicity.
supporting img

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.

2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.

3 If Assertion is true statement but Reason is false.

4 Assertion is false but reason is true.

CHXI02:STRUCTURE OF ATOM

307269 Match the column I (element or ion) with column II (It’s electronic configuration) and choose the correct option.

Column I	Column II
A. $C u$	P. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$
B. $C u^{2 +}$	Q. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}$
C. $Z n^{2 +}$	R. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1}$
D. $C r^{3 +}$	S. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9}$

1 A - S, B - R, C - P, D - Q

2 A - R, B - S, C - P, D - Q

3 A - Q, B - S, C - R, D - P

4 A - R, B - Q, C - P, D - S

CHXI02:STRUCTURE OF ATOM

307275 Out of the following electronic arrangements for outer electronic configuration.

1

2

3

4

CHXI02:STRUCTURE OF ATOM

307308 Assertion :
The Mo $(Z = 42)$ atom has six unpaired electrons.
Reason :
Half-filled s-orbital has greater stability.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

The electronic configuration of Molybdenum (Mo) is $[Kr] 4 d^{5} 5 s^{1}$ . In this configuration, there are six unpaired electrons. In the case of molybdenum, it has one unpaired electron in the $5 s$ orbital, which is not fully filled. A fully filled s-orbital is more stable. So option (3) is correct.

CHXI02:STRUCTURE OF ATOM

307309 The electronic configuration of a dipositive ion $M^{2 +}$ is $2, 8, 14$ and its mass number is 56 .The number of neutrons in $M$ present is

1 32

2 42

3 30

4 34

Explanation:

Number of electrons in
$M^{2 +} = 2 + 8 + 14 = 24$
$∴$ Number of electrons in $M = 26$
i.e., atomic number Z=26
Mass number $(A) = 56$
$∴$ Number of neutrons A - Z = 56 -26 =30

CHXI02:STRUCTURE OF ATOM

307310 Assertion :
The electronic configuration of the nitrogen atom is represented as shown in below figure.
Reason :
The electronic configuration of the ground state of an atom is the one which has the greatest multiplicity.
supporting img

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.

2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.

3 If Assertion is true statement but Reason is false.

4 Assertion is false but reason is true.

CHXI02:STRUCTURE OF ATOM

307269 Match the column I (element or ion) with column II (It’s electronic configuration) and choose the correct option.

Column I	Column II
A. $C u$	P. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$
B. $C u^{2 +}$	Q. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}$
C. $Z n^{2 +}$	R. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1}$
D. $C r^{3 +}$	S. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9}$

1 A - S, B - R, C - P, D - Q

2 A - R, B - S, C - P, D - Q

3 A - Q, B - S, C - R, D - P

4 A - R, B - Q, C - P, D - S

CHXI02:STRUCTURE OF ATOM

307275 Out of the following electronic arrangements for outer electronic configuration.

1

2

3

4

CHXI02:STRUCTURE OF ATOM

307308 Assertion :
The Mo $(Z = 42)$ atom has six unpaired electrons.
Reason :
Half-filled s-orbital has greater stability.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

The electronic configuration of Molybdenum (Mo) is $[Kr] 4 d^{5} 5 s^{1}$ . In this configuration, there are six unpaired electrons. In the case of molybdenum, it has one unpaired electron in the $5 s$ orbital, which is not fully filled. A fully filled s-orbital is more stable. So option (3) is correct.

CHXI02:STRUCTURE OF ATOM

307309 The electronic configuration of a dipositive ion $M^{2 +}$ is $2, 8, 14$ and its mass number is 56 .The number of neutrons in $M$ present is

1 32

2 42

3 30

4 34

Explanation:

Number of electrons in
$M^{2 +} = 2 + 8 + 14 = 24$
$∴$ Number of electrons in $M = 26$
i.e., atomic number Z=26
Mass number $(A) = 56$
$∴$ Number of neutrons A - Z = 56 -26 =30

CHXI02:STRUCTURE OF ATOM

307310 Assertion :
The electronic configuration of the nitrogen atom is represented as shown in below figure.
Reason :
The electronic configuration of the ground state of an atom is the one which has the greatest multiplicity.
supporting img

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.

2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.

3 If Assertion is true statement but Reason is false.

4 Assertion is false but reason is true.

CHXI02:STRUCTURE OF ATOM

307269 Match the column I (element or ion) with column II (It’s electronic configuration) and choose the correct option.

Column I	Column II
A. $C u$	P. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$
B. $C u^{2 +}$	Q. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}$
C. $Z n^{2 +}$	R. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1}$
D. $C r^{3 +}$	S. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9}$

1 A - S, B - R, C - P, D - Q

2 A - R, B - S, C - P, D - Q

3 A - Q, B - S, C - R, D - P

4 A - R, B - Q, C - P, D - S

CHXI02:STRUCTURE OF ATOM

307275 Out of the following electronic arrangements for outer electronic configuration.

1

2

3

4

CHXI02:STRUCTURE OF ATOM

307308 Assertion :
The Mo $(Z = 42)$ atom has six unpaired electrons.
Reason :
Half-filled s-orbital has greater stability.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

The electronic configuration of Molybdenum (Mo) is $[Kr] 4 d^{5} 5 s^{1}$ . In this configuration, there are six unpaired electrons. In the case of molybdenum, it has one unpaired electron in the $5 s$ orbital, which is not fully filled. A fully filled s-orbital is more stable. So option (3) is correct.

CHXI02:STRUCTURE OF ATOM

307309 The electronic configuration of a dipositive ion $M^{2 +}$ is $2, 8, 14$ and its mass number is 56 .The number of neutrons in $M$ present is

1 32

2 42

3 30

4 34

Explanation:

Number of electrons in
$M^{2 +} = 2 + 8 + 14 = 24$
$∴$ Number of electrons in $M = 26$
i.e., atomic number Z=26
Mass number $(A) = 56$
$∴$ Number of neutrons A - Z = 56 -26 =30

CHXI02:STRUCTURE OF ATOM

307310 Assertion :
The electronic configuration of the nitrogen atom is represented as shown in below figure.
Reason :
The electronic configuration of the ground state of an atom is the one which has the greatest multiplicity.
supporting img

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.

2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.

3 If Assertion is true statement but Reason is false.

4 Assertion is false but reason is true.

CHXI02:STRUCTURE OF ATOM

307269 Match the column I (element or ion) with column II (It’s electronic configuration) and choose the correct option.

Column I	Column II
A. $C u$	P. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$
B. $C u^{2 +}$	Q. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}$
C. $Z n^{2 +}$	R. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1}$
D. $C r^{3 +}$	S. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9}$

1 A - S, B - R, C - P, D - Q

2 A - R, B - S, C - P, D - Q

3 A - Q, B - S, C - R, D - P

4 A - R, B - Q, C - P, D - S

CHXI02:STRUCTURE OF ATOM

307275 Out of the following electronic arrangements for outer electronic configuration.

1

2

3

4

CHXI02:STRUCTURE OF ATOM

307308 Assertion :
The Mo $(Z = 42)$ atom has six unpaired electrons.
Reason :
Half-filled s-orbital has greater stability.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

The electronic configuration of Molybdenum (Mo) is $[Kr] 4 d^{5} 5 s^{1}$ . In this configuration, there are six unpaired electrons. In the case of molybdenum, it has one unpaired electron in the $5 s$ orbital, which is not fully filled. A fully filled s-orbital is more stable. So option (3) is correct.

CHXI02:STRUCTURE OF ATOM

307309 The electronic configuration of a dipositive ion $M^{2 +}$ is $2, 8, 14$ and its mass number is 56 .The number of neutrons in $M$ present is

1 32

2 42

3 30

4 34

Explanation:

Number of electrons in
$M^{2 +} = 2 + 8 + 14 = 24$
$∴$ Number of electrons in $M = 26$
i.e., atomic number Z=26
Mass number $(A) = 56$
$∴$ Number of neutrons A - Z = 56 -26 =30

CHXI02:STRUCTURE OF ATOM

307310 Assertion :
The electronic configuration of the nitrogen atom is represented as shown in below figure.
Reason :
The electronic configuration of the ground state of an atom is the one which has the greatest multiplicity.
supporting img

1 If both Assertion & Reason are true and reason is the correct explanation of the assertion.

2 If both Assertion & Reason are true but reason is not the correct explanation of the assertion.

3 If Assertion is true statement but Reason is false.

4 Assertion is false but reason is true.

CHXI02:STRUCTURE OF ATOM

307269 Match the column I (element or ion) with column II (It’s electronic configuration) and choose the correct option.

Column I	Column II
A. $C u$	P. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$
B. $C u^{2 +}$	Q. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}$
C. $Z n^{2 +}$	R. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1}$
D. $C r^{3 +}$	S. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9}$

1 A - S, B - R, C - P, D - Q

2 A - R, B - S, C - P, D - Q

3 A - Q, B - S, C - R, D - P

4 A - R, B - Q, C - P, D - S

CHXI02:STRUCTURE OF ATOM

307275 Out of the following electronic arrangements for outer electronic configuration.

1

2

3

4

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