A. P<S<B<F
B. B<P<S<F
C. B<S<P<F
D. F<S<P<B
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Answer: C. B<S<P<F The increasing order of the first ionisation enthalpies of elements B, P, S and F is B<S<P<F.
Answer: C. B<S<P<F
See lessThe increasing order of the first ionisation enthalpies of elements B, P, S and F is B<S<P<F.