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Question

The first (ΔH1) and second (ΔH2) ionisation enthalpies (in kJ mol1) and the (ΔegH) electron gain enthalpy (in kJ mol1) of a few elements are given below:
Elements Δ1H1 Δ1H2 ΔegH
(A) P 520 7300 -60
(B) Q 419 3051 -48
(C) R 1681 3374 -328
(D) S 1008 1846 -295
(E) T 2372 5251 +48
(F) U 738 1451 -40
The most reactive metal is :

A
P
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B
Q
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C
S
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D
U
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Solution

The correct option is B Q
Metal having low IE1 and higher IE2 corresponds to alkali metal. Hence, Q is most reactive metal (easily forms cation).

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