NTA Abhyas JEE Main2020ChemistryClassification of Elements and Periodicity in PropertiesPractice
The first Δ i H 1 and second Δ i H 2 ionization enthalpies (in kJ mo l - 1 ) and the electron gain enthalpy Δ eg H (in kJ mo l - 1 ) of the elements I, II, III, IV and V are given below Element Δ i H 1 Δ i H 2 Δ eg H I 520 7300 − 60 II 419 3051 −48 III 1681 3374 −328 IV 1008 1846 −295 V 2372 5251 +48 the least reactive non- metal and the most reactive metal of these are respectively
Options
- AIV and V
- BII and V
- CV and III
- DV and II
Correct answer
D. V and II
Step-by-step solution
Generally metals having low I.E.are more reactive and Δ eg H = + ve for noble gas.