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Assertion: The first ionization energy o...

Assertion: The first ionization energy of Be is greater than that of B.
Reason: 2p-orbital is lower in energy than 2s-orbital.

A

Both Assertion and Reason are true and reason is the correct explanation of Assertion.

B

Both Assertion and Reason are true but Reason is not correct explanation of Asseration.

C

Assertion is true but Reason is false.

D

Assertion is false but Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
C
Be has completely filled stable `2s^(2)` orbital and thus Be has higher ionisation energy than `B. 2s` orbital has less energy than `2p` orbital. (From `(n+l)"rule")`
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RESONANCE-PERIODIC TABLE & PERIODICITY-Exercise
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  2. The correct order of radii is:

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  3. Assertion: The first ionization energy of Be is greater than that of B...

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  4. The set representing the correct order of the first ionisation potenti...

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  5. Identify the least stable ion amongst the following:

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  6. Assertion (A) : Pb^(+4) compounds are stronger oxidiising agents than...

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  7. Among the following , the number of elements showing only one non-zero...

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  8. Which one of the following ions has the highest value of ionic radius?

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  9. The formation of the oxide ion O((g))^(2-) requires first an exothermi...

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  10. In which of the following arrangements has order is NOT according to t...

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  11. Which of the following factors may be regarded as the main cause of la...

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  12. The lanthanide contraction is responsible for the fact that

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  13. The increasing order of the first ionization enthalpies of the element...

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  14. Lanthanoid contraction is caused due to:

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  15. The stability of dihaiides of Si, Ge, Sn and Pb increases steadlly in ...

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  16. The set representing the correct order of ionic radius is : a)Na^(+) g...

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  17. The correct sequence which shows decreasing order of the ionic radii o...

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  18. The outer electronic configuration of Gd (At.No. 64) is

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  19. the correct order of electron gain enthalpy with negative sign of F,Cl...

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  20. The increasing order of the ionic radii of the given isoelectronic spe...

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