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Question

Match the elecgtronic configurations of the elements given in List - I with their correct characteristic(s) (i.e. properties for given configuration) given in List-II and select the correct answer using the code given below the lists.
ListIListII(I)1s2(P) Element shows highest negative oxidation state.(II)1s22s22p5(Q) Element shows highest first ionisation enthalpy.(III) 1s22s22p63s23p5(R) Element shows highest electronegativity on Pauling scale.(IV) 1s22s22p2(S) Element shows maximum electron gain enthalpy (mostexothermic).(T) Configuration belongs to Cl(U) configuration belongs to C

A
I - Q; II - R; III - S, T; IV - P, U
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B
I - P; II - Q; III - S, T; IV - P, U
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C
I - Q; II - R; III - S; IV - U
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D
I - P; II - R; III - S, T; IV - P
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Solution

The correct option is A I - Q; II - R; III - S, T; IV - P, U
(I) This configuration belongs to He which was highest first ionization enthalpy amongst all the elements of the periodic table. This is attributed to stable configuration and it's small size.

(II) configuration belongs to fluorine and F has highest electronegativity on Pauling scale.

(III) configuration belongs to Cl, which has the maximum negative electron gain enthalpy (even greater than F; due to it's larger size and lesser inter-electronic repulsion).

(IV) This configuration belongs to C and it shows -4 oxidation state because it attains inert gas configuration of neon by gaining four electrons.

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