Question:
Match List-I with List-II.
List - I List - II (a) Li (i) Absorbent for carbon dioxide (b) Na (ii) Electrochemical cells (c) KOH (iii) Coolant in fast breeder reactors (d) Cs (iv) Photoelectric cell
Choose the correct answer from the options given below:
Match List-I with List-II.
| List - I | List - II | ||
| (a) | Li | (i) | Absorbent for carbon dioxide |
| (b) | Na | (ii) | Electrochemical cells |
| (c) | KOH | (iii) | Coolant in fast breeder reactors |
| (d) | Cs | (iv) | Photoelectric cell |
Choose the correct answer from the options given below:
Updated On: May 2, 2025
- (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
- (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
- (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
- (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
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The Correct Option is D
Solution and Explanation
The correct associations are as follows:
- Li is used in Electrochemical cells due to its high energy density and reactivity.
- Na serves as a coolant in fast breeder reactors because of its excellent thermal conductivity and low neutron absorption cross-section.
- KOH is a strong base and effective absorbent for carbon dioxide; it reacts with CO2 readily.
- Cs is used in Photoelectric cells for its ability to release electrons upon exposure to light, due to its low work function.
The correct match is thus: (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv).
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Concepts Used:
Group 1 Elements
Group one of alkali metals is s-block elements with just one electron in their s-orbital. They are are alkali metals. They are named so because of the alkaline nature of the hydroxides and oxides.
Alkali metals are characterized by one s-electron in the valence shell of their atoms.
Alkali metals have a corresponding [Noble gas] ns1 electronic configuration. They occupy the first column of the periodic table. Alkali elements are:
- Lithium(Li)
- Sodium(Na)
- Potassium (K)
- Rubidium (Ru)
- Cesium (Cs)
- Francium (Fr)
They have occupied successive periods from first to seven. Francium is a radioactive element with very low half-life.
Electronic Configuration:
- Alkali metals have one electron in their valence shell.
- The electronic configuration is given by ns1. For example, the electronic configuration of lithium is given by 1ns1 2ns1.
- They tend to lose the outer shell electron to form cations with charge +1 (monovalent ions).
This makes them the most electropositive elements and due to the same reason, they are not found in the pure state.