Question

Column-I: Property; Column-II: Variation of property; Column-III: Magnitude

$\begin{array}{cccccc}& \text{Column-I}& & \text{Column-II}& & \text{Column-III}\\ \text{(I)}& \text{Electron affinity}\left(E{A}_1\right)& \left(i\right)& \text{Decreases along the period}& \left(P\right)& \text{Highest in halogen in their respective periods}\\ \left(II\right)& \text{Ionization energy}\left(I{E}_1\right)& \left(ii\right)& \text{Directly proportional to}{Z}_{eff}& \left(Q\right)& \text{Highest in noble gases in their respective periods}\\ \left(III\right)& \text{Electronegativity}& \left(iii\right)& \text{Decreases down the group}& \left(R\right)& \text{Highest in alkali metals in their respective periods}\\ \left(IV\right)& \text{Electropositive character}& \left(iv\right)& \text{Inversly proportional to size}& \left(S\right)& \text{Moderate in noble gases in their respective periods}\end{array}$

The only correct combination for the energy involved during the gain of an electron is:

• A. (I) (ii) (P)
• B. (I) (iii) (Q)
• C. (III) (ii) (P)
• D. (III) (iii) (Q)

Answer 1

The correct option is A

(I) (ii) (P)

Based on what is asked in this question, we have to pick a parameter from the first column and then choose its correct trend from the second column. Lastly, we have to choose a cell from the third column such that the cell reflects accurate details in terms of the magnitude of the chosen parameter.

The question purports - "The only correct combination for the energy involved during the gain of an electron is:", which clearly implies electron affinity.

Within the same period, electronegativity increases as we move from left to right. Also, generally speaking, the effective nuclear charge $Z_{eff}$ also has a similar trend. From the given options, (I) (ii) (P) makes the most sense.