Question

List-I contains some group-I elements and List-II contains their electron gain enthalpy values (in kJ mol\(^{-1}\))
List-I: (i) H, (ii) Li, (iii) Na, (iv) K
List-II: (a) -48, (b) -53, (c) -73, (d) -60
Choose the correct match.

• A. (i)-(a), (ii)-(c), (iii)-(d), (iv)-(b)
• B. (i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)
• C. (i)-(d), (ii)-(b), (iii)-(c), (iv)-(a)
• D. (i)-(a), (ii)-(b), (iii)-(c), (iv)-(d)

Hint:

For Group 1, just remember the trend: "Bigger the atom, smaller (less negative) the electron gain enthalpy." H is smallest, so it releases the most energy upon gaining an electron.

Answer 1

The Correct Option is B