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Assertion (A) : He and Be have similar o...

Assertion (A) : He and Be have similar outer shell electronic configuration of type `ns^(2)`.
Reason (R ) : Both are chemically inert.

A

A and R are true and R is the correct explanation of A

B

A and R are true but R is not the correct explanation of A

C

A is true R is false

D

Both A and R are false

Text Solution

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The correct Answer is:
c
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  5. The correct order of size among Br^(+), Br, Br^(-)

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  6. The elements having highest ionization energies within their periods a...

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  7. Across the period , Ionisation energy

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  8. Statements I : Ionisation energy of fluorine is greater than oxygen. ...

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  9. Which of the following statements are correct? (i) Helium has the ...

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  10. Which of the following factor decreases across the period ?

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  11. Ionisation enthalpy is an process

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  12. The effective nuclear charge across the period (from left to right)

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  13. Which of the following N^(3-),O^(2-),F^(-) is largest in size?

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  14. The radii of F, F^(-) , O andO^(2-) are in the order

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  15. Which of the following atom has the lowest ionization enthalpy?

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  16. Which of the following has the highest positive electron gain enthalpy...

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  17. Which of the following statements is incorrect ?

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  18. Correct order of 1st ionization potential among elements Be,B,C,N,O is

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  19. The most electronegative element of the periodic table is

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