Q.

Which of the following transformation requires least energy ?

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a

F(g)−⟶F(g)+e−

b

P(g)−⟶P(g)+e−

c

S(g)−⟶S(g)+e−

d

Cl(g)−→Cl(g)+e−

answer is B.

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Detailed Solution

If we consider the opposite process :(1) F(g)+e−⟶F(g)− ; ΔH1(2) P(g)+e−⟶P(g)− ; ΔH2(3) S(g)+e−⟶S(g)− ; ΔH3(4) Cl(g)+e−⟶Cl(g)− ; ΔH4Order of energy releases is : ΔH4>ΔH1>ΔH3>ΔH2 So, P(g)−→P(g)+e− Requires least energy.
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