11th Class Chemistry Classification of Elements and Periodicity in Properties

  • question_answer 94)   Match the correct ionisation enthalpies and electron gain enthalpies of the following elements :
    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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