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01/10/2020 4:22 pm
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In which of the following arrangements, the order is NOT according to the property indicated against it?
(a) Li < Na < K < Rb :
Increasing metallic radius
(b) I < Br < F < Cl :
Increasing electron gain enthalpy (with negative sign)
(c) B < C < N < O
Increasing first ionization enthalpy
(d) Al3+ < Mg2+ < Na+ < F-
Increasing ionic size
1 Answer
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01/10/2020 4:23 pm
(c) B < C < N < O
Increasing first ionization enthalpy
Explanation:
In a period the value of ionisation potential increases from left to right with breaks where the atoms have some what stable configuration. In this case N has half filled stable orbital. Hence has highest ionisation energy. Thus the correct order is
B < C < O < N not B < C < N < O