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Classification of Elements and Periodicity in Properties
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24/08/2021 11:11 am
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The first (ΔiH1) and second (ΔiH2) ionization enthalpies (in kJ mol-1) and the electron gain enthalpy (ΔegH) (in kJ mol-1) of the elements I, II, III, IV and V are given below
Element - ΔiH1 - ΔiH2 - ΔegH
I - 520 - 7300 –60
II - 419 - 3051 –48
III - 1681 - 3374 –328
IV - 1008 - 1846 –295
V - 2372 - 5251 +48
The most reactive metal and the least reactive non-metal of these are respectively
(a) I and V
(b) V and II
(c) II and V
(d) IV and V
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24/08/2021 11:13 am
Correct answer: (c) II and V
Explanation:
I represents Li, II represents K III represents Br, IV represents I, V represents He
So, amongst these, II represents most reactive metal and V represents least reactive non-metal.