Which of the following represents the correct order of increasing first ionisation enthalpies of Ca,Ba,S,Se and Ar?
A
Ca<S<Ba<Se<Ar
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B
S<Se<Ca<Ba<Ar
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C
Ba<Ca<Se<S<Ar
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D
Ca<Ba<S<Se<Ar
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Solution
The correct option is CBa<Ca<Se<S<Ar On moving down the group, ionisation enthalpy decreases.
Hence, the ionisation energy of Ba<Ca and Se<S.
In general, ionisation energy increases from left to right in a period. Hence, S<Ar and Ca<Se.
Hence, the correct order of increasing ionisation enthalpies is Ba<Ca<Se<S<Ar.