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The first (Delta(i)H(1) and second (Delt...

The first `(Delta_(i)H_(1)` and second `(Delta_(i)H_(2)` ionization enthalpies (in kJ/mol) and electron gain enthalpy (in kJ/mol) of few elements are given below:
`{:("Elements",Delta_(i)H_(1),Delta_(i)H_(2),Delta_(eg)H),(I,520,7300,-60),(II,1681,3374,-328),(III,899,1757,+48),(IV,2372,5251,+48):}`
Which of the following is likely to be an alkali metal?

A

I and IV

B

V and II

C

II and V

D

IV and V

Text Solution

Verified by Experts

The correct Answer is:
C
I represents Li,II represents K,III represents Br,IV represents iodine,V represents He.
So,amongst these,II represents ost reactive metal and V represents least reactive non-metal.
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The first (Delta_(i)H_(1)) and second (Delta_(i)H_(2)) ionisation enthalpies ("in" kJ mol^(-1)) and the (Delta_(eg)H^(ө)) electron gain enthalpy ("in" kJ mol^(-1)) of a few elements are given below: {:("Elements",(Delta_(i)H_(1)),(Delta_(i)H_(2)),Delta_(eg)H^(ө)),(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 MX (X=halogen). f. the metal which can form a predominantly stable covalent halide of the formula MX(X=halogen).

The first (Delta_(i)H_(1)) and second (Delta_(i)H_(2)) ionization enthalpies ("in kJ mol"^(-1)) and the electron gain enthalpy (Delta_(eg)H)("in kJ mol"^(-1)) of the elements I, II, III, IV and V are given below the least reactive non - metal and the most reactive metal of these are respectively