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Q.

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

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a

S

b

P

c

As 

d

As 

answer is C.

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Detailed Solution

IE1 of P > S due to half-filled stable configuration (3s2, 3p3) of P. Moreover, P and As both belong to group 15, but P is in the 3rd period and As is in the 4th period and IE1 decreases down the group (↓). Hence, the answer is (3).
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