Elements | \[\Delta {{\mathbf{H}}_{\mathbf{1}}}\] | \[\Delta {{\mathbf{H}}_{\mathbf{2}}}\] | \[{{\Delta }_{eg}}\mathbf{H}\] |
(i) Most reactive non-metal | (a) 419 | 3051 | -48 |
(ii) Most reactive metal | (b) 1681 | 3374 | -328 |
(iii) Least reactive element | (c) 738 | 1451 | -40 |
(iv) Metal forming binary halide | (d) 2372 | 5251 | +48 |
Answer:
(i - b)
The most reactive non-metal is
the halogen which has maximum value of electron gain enthalpy.
(ii - a)
The most reactive metal is the
alkali metal which has minimum ionisation enthalpy.
(iii - d)
The least reactive element is an
inert gas having high ionisation enthalpy and positive electron gain enthalpy.
(iv - c)
Metal forming binary halide is
an alkaline earth metal.
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