1.

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)?

Answer»

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)?


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