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CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313332 From the ground state electronic configurations of the elements given below, pick up the one with highest value of second ionisation enthalpy

1

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}

2

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

3

1 s^{2} 2 s^{2} 2 p^{6}

4

1 s^{2} 2 s^{2} 2 p^{5}

Explanation:

Here, $I E_{2}$ involves the removal of an electron from the inert gas configuration $(1 s^{2} 2 s^{2} 2 p^{6})$ . So, it has highest value of second ionisation enthalpy.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313333 A large increase from the first to the second ionisation energy of an element ' A ' can be seen if its electronic configuration is

1

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

2

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}

3

1 s^{2} 2 s^{2} 2 p^{5}

4

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2}

Explanation:

Element ' A ' with the E.C. $- 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$ will have large increase in the second ionisation energy due to the stable configuration (noble gas configuration) after the removal of 3 s-electron and it is difficult to remove an electron from the stable noble gas configuration.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313334 Assertion :
I.E. of $_{7} N$ is more than that of, $_{8} O$ as well as $_{6} C$ .
Reason :
This is due to difference in reactivity towards oxygen.

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.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313335 For one of the elements various successive ionization enthalpies $(i n k J m o l^{- 1})$ are given below the element is
supporting img

1 P

2 Mg

3 Si

4 Al

Explanation:

Large jump between $I E_{3} a n d I E_{4}$ suggest that the element has three valence electrons.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313332 From the ground state electronic configurations of the elements given below, pick up the one with highest value of second ionisation enthalpy

1

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}

2

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

3

1 s^{2} 2 s^{2} 2 p^{6}

4

1 s^{2} 2 s^{2} 2 p^{5}

Explanation:

Here, $I E_{2}$ involves the removal of an electron from the inert gas configuration $(1 s^{2} 2 s^{2} 2 p^{6})$ . So, it has highest value of second ionisation enthalpy.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313333 A large increase from the first to the second ionisation energy of an element ' A ' can be seen if its electronic configuration is

1

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

2

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}

3

1 s^{2} 2 s^{2} 2 p^{5}

4

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2}

Explanation:

Element ' A ' with the E.C. $- 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$ will have large increase in the second ionisation energy due to the stable configuration (noble gas configuration) after the removal of 3 s-electron and it is difficult to remove an electron from the stable noble gas configuration.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313334 Assertion :
I.E. of $_{7} N$ is more than that of, $_{8} O$ as well as $_{6} C$ .
Reason :
This is due to difference in reactivity towards oxygen.

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.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313335 For one of the elements various successive ionization enthalpies $(i n k J m o l^{- 1})$ are given below the element is
supporting img

1 P

2 Mg

3 Si

4 Al

Explanation:

Large jump between $I E_{3} a n d I E_{4}$ suggest that the element has three valence electrons.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313332 From the ground state electronic configurations of the elements given below, pick up the one with highest value of second ionisation enthalpy

1

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}

2

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

3

1 s^{2} 2 s^{2} 2 p^{6}

4

1 s^{2} 2 s^{2} 2 p^{5}

Explanation:

Here, $I E_{2}$ involves the removal of an electron from the inert gas configuration $(1 s^{2} 2 s^{2} 2 p^{6})$ . So, it has highest value of second ionisation enthalpy.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313333 A large increase from the first to the second ionisation energy of an element ' A ' can be seen if its electronic configuration is

1

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

2

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}

3

1 s^{2} 2 s^{2} 2 p^{5}

4

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2}

Explanation:

Element ' A ' with the E.C. $- 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$ will have large increase in the second ionisation energy due to the stable configuration (noble gas configuration) after the removal of 3 s-electron and it is difficult to remove an electron from the stable noble gas configuration.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313334 Assertion :
I.E. of $_{7} N$ is more than that of, $_{8} O$ as well as $_{6} C$ .
Reason :
This is due to difference in reactivity towards oxygen.

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.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313335 For one of the elements various successive ionization enthalpies $(i n k J m o l^{- 1})$ are given below the element is
supporting img

1 P

2 Mg

3 Si

4 Al

Explanation:

Large jump between $I E_{3} a n d I E_{4}$ suggest that the element has three valence electrons.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313332 From the ground state electronic configurations of the elements given below, pick up the one with highest value of second ionisation enthalpy

1

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}

2

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

3

1 s^{2} 2 s^{2} 2 p^{6}

4

1 s^{2} 2 s^{2} 2 p^{5}

Explanation:

Here, $I E_{2}$ involves the removal of an electron from the inert gas configuration $(1 s^{2} 2 s^{2} 2 p^{6})$ . So, it has highest value of second ionisation enthalpy.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313333 A large increase from the first to the second ionisation energy of an element ' A ' can be seen if its electronic configuration is

1

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

2

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}

3

1 s^{2} 2 s^{2} 2 p^{5}

4

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2}

Explanation:

Element ' A ' with the E.C. $- 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$ will have large increase in the second ionisation energy due to the stable configuration (noble gas configuration) after the removal of 3 s-electron and it is difficult to remove an electron from the stable noble gas configuration.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313334 Assertion :
I.E. of $_{7} N$ is more than that of, $_{8} O$ as well as $_{6} C$ .
Reason :
This is due to difference in reactivity towards oxygen.

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.

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313335 For one of the elements various successive ionization enthalpies $(i n k J m o l^{- 1})$ are given below the element is
supporting img

1 P

2 Mg

3 Si

4 Al

Explanation:

Large jump between $I E_{3} a n d I E_{4}$ suggest that the element has three valence electrons.