The first (∆_{i} H_{1}) and second (∆_{i} H_{2}) ionisation enthalpies (in kJ mol ^{-1} ) and the (∆_{e g} H) electron gain enthalpy (in {kJ} {mol}^{-1} ) of the elements I, II, III, IV and V are given below Element ∆_1H_1 ∆_1H_2 ∆_{\eg}H 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

KEAM 2010 Physics and Chemistry Paper

Question : 97 of 119

Marks: +1, -0

The first (∆iH1) and second (∆iH2) ionisation enthalpies (in kJ mol ‌−1 ) and the (∆egH) electron gain enthalpy (in kJmol−1 ) of the elements I, II, III, IV and V are given below

Element	∆1H1	∆1H2	∆egH
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

I and V
V and II
II and V
IV and V
V and III

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