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The first (ΔiH1) and the second (ΔiH2) ionization enthalpies (in kJ mol1) and the (ΔegH) electron gain enthalpy (in kJ mol1) of a few elements are given below:
ElementsΔH1ΔH2ΔegH
I5207300-60
II4193051-48
III16813374-328
IV10081846-295
V23725251+48
VI7381451-40
Which of the above elements is likely to be :
(a) the least reactive element,
(b) the most reactive metal,
(c) the most reactive non-metal,
(d) the least reactive non-metal,
(e) the metal which can form a stable binary halide of the formula MX2 (X=halogen) and
(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?

Solution
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(a) The element V is the least reactive element as it has highest value of first ionization energy and positive electron gain enthalpy.
(b) The metal II is the most reactive metal. It has very low value of first ionization energy.
(c) The element III is the most reactive non metal. Its electron gain enthalpy is most negative.
(d) The element IV is the least reactive non metal as it has least negative electron gain enthalpy among the non metals.
(e) The metal VI can form a stable binary halide of the formula MX2 as it has lowest value of second ionization enthalpy.
(f) The metal I can form a stable MX halide

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Similar Questions
Q1
The first (ΔiH1) and the second (ΔiH2) ionization enthalpies (in kJ mol1) and the (ΔegH) electron gain enthalpy (in kJ mol1) of a few elements are given below:
ElementsΔH1ΔH2ΔegH
I5207300-60
II4193051-48
III16813374-328
IV10081846-295
V23725251+48
VI7381451-40
Which of the above elements is likely to be :
(a) the least reactive element,
(b) the most reactive metal,
(c) the most reactive non-metal,
(d) the least reactive non-metal,
(e) the metal which can form a stable binary halide of the formula MX2 (X=halogen) and
(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?
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Q2

The first (ΔiH1) and the second (ΔiH) ionization enthalpies (in kJ mol–1) and the (ΔegH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:

Elements ΔiH ΔiH ΔegH
I 520 7300 –60
II 419 3051 –48
III 1681 3374 –328
IV 1008 1846 –295
V 2372 5251 +48
VI 738 1451 –40

Which of the above elements is likely to be :

(a) the least reactive element.

(b) the most reactive metal.

(c) the most reactive non-metal.

(d) the least reactive non-metal.

(e) the metal which can form a stable binary halide of the formula MX2, (X=halogen).

(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?

View Solution
Q3
The first (ΔH1) and second (ΔH2) ionisation enthalpies (in kJmol1) and the electron gain enthalpy (ΔegH) (in kJmol1) of the elements I, II, III, IV and V are given below:
ElementΔ1H1Δ1H2ΔegH
I5207300-60
II4193051-48
II16813374-328
IV10081846-295
V23725251+48
The most reactive metal and the least reactive non-metal of these are respectively.
View Solution
Q4
Match the correct ionization enthalpies and electron gain enthalpies of the following elements.

List IList II
A. Most reactive non-metal1. ΔH1=419,ΔH2=3051,ΔegH=48
B. Most reactive metal2. ΔH1=1681,ΔH2=3374,ΔegH=328
C. Least reactive elements
3. ΔH1=738,ΔH2=1451,ΔegH=40
D. Metal forming binary halide4. ΔH1=3272,ΔH2=5251,ΔegH=+48

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Q5

Match the corect ionisation enthalpies and electron gain enthalpies of the following elements.
ElementsH1H2egH(i)Most reactive non metalA419305148(ii)Most reactive metalB16813374328(iii)Least reactive elementC738145140(iv)Metal forming binary halideD.23725251+48

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