Question

Match List - I with List - II : 

Choose the correct answer from the options given below : 
 

• (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
• (a) - (v), (b) - (i), (c) - (ii), (d) - (iv)
• (a) - (v), (b) - (ii), (c) - (iv), (d) - (i)
• (a) - (v), (b) - (iii), (c) - (ii), (d) - (i)

Hint:

Alkali metals have very specific industrial uses. Remember these key applications: Li in alloys and batteries, Na as a coolant and in organic synthesis, K in fertilizers and as a CO$_2$ absorbent, and Cs in photoelectric cells and atomic clocks.

Answer 1

The Correct Option is D

To match List-I with List-II, we need to understand the common uses or associations of the elements in List-I.

1. Li (Lithium): Lithium is commonly used in bearings for motor engines due to its lubricating properties when combined with other substances.
   • Match: (a) - (v)
2. Na (Sodium): Sodium is often used as a coolant in fast breeder nuclear reactors due to its excellent heat transfer capabilities.
   • Match: (b) - (iii)
3. K (Potassium): Potassium is used as an absorbent for CO_2 in certain chemical processes.
   • Match: (c) - (ii)
4. Cs (Cesium): Cesium is used in photoelectric cells due to its ability to easily emit electrons.
   • Match: (d) - (i)

Therefore, the correct option is:

(a) - (v), (b) - (iii), (c) - (ii), (d) - (i)

This option correctly matches each element in List-I with its corresponding use or association in List-II.