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Assertion :First ionization energy is lo...

Assertion :First ionization energy is lower than oxygen.
Reason :Across a period effective charge decreases.

A

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

B

If both assertion and reason are true but reason is not a correct explanation of the assertion

C

If assertion is true but reason is false

D

If the assertion and reason both are false

Text Solution

Verified by Experts

The correct Answer is:
D
First ionisation energy for N is more than oxygen. Nuclear charge increases across the period.
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ERRORLESS -CLASSIFICATION OF ELEMENTS AND PERIODIC PROPERTIES -Ordinary Thinking Objective Questions Ionisation Energy
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  2. Which of the following species has lowest ionisation potential?

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  3. The correct order in which the first ionisation potential increases is

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  4. Generally, the first ionisation energy increases along a period. But t...

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  5. Ionisation energy in group I-A varies in the decreasing order as

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  6. The second ionisation potential of an element M is the energy required...

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  7. Arrange S, P and As in order of increasing ionisation energy.

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  8. Which ionisation potential (IP) in the following equations involves th...

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  9. Which of the following has highest ionisation energy ?

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  10. Which one of the following elements has the highest ionisation energy?

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  11. Which of the following electrons should generally have the highest val...

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  12. The first ionisation energy of beryllium is more than that of boron be...

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  13. A rarr A^(+)+e,E(1) and A^(+) rarr A^(2+)+e,E(2). The energy requried ...

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  14. Which of the following explanation is best for not placing hydrogen in...

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  15. Choose the correct statement

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  16. The ionisation energy of an element is

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  17. Assertion :First ionization energy is lower than oxygen. Reason :Ac...

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  18. Assertion: E^(@) for Mn^(3+)//Mn^(2+) is more positive than Cr^(3+)//C...

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  19. Assertion : Ionisation enthalpy is always negative. Reason : Energy...

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  20. Assertion: Ionisation potential across the period is NaltAlltMgltSi. ...

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