Match List I with List II and select the correct answer using the code given below the Lists:
| List I (Element) |
List II (Use) |
|---|---|
| A. Li | 1. Time keeper in atomic clocks |
| B. Na | 2. Batteries |
| C. K | 3. Transfer of nerve impulses |
| D. Cs | 4. Control of the water content in the blood |
2 3 4 1
1 2 3 4
2 4 3 1
1 3 2 4
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-2 – 2015
A. Li (Lithium): Lithium is a highly reactive alkali metal widely used in batteries, particularly rechargeable lithium-ion batteries that power portable electronic devices, electric vehicles, etc. This matches characteristic 2. (A-2)
B. Na (Sodium): Sodium ions (Na+) are essential electrolytes in the body. They play a critical role in regulating blood pressure and the control of water balance in the blood and body tissues through osmosis. This matches characteristic 4. (B-4)
C. K (Potassium): Potassium ions (K+) are also essential electrolytes involved in various bodily functions, including the transmission of nerve impulses and muscle contractions (along with sodium ions). This matches characteristic 3. (C-3)
D. Cs (Cesium): Cesium is an alkali metal, and the isotope Cesium-133 is famously used in atomic clocks due to the highly stable frequency of radiation emitted during electron transitions in its atom, which defines the length of a second. This matches characteristic 1. (D-1)
Thus, the correct matching is A-2, B-4, C-3, D-1, which corresponds to option C (2 4 3 1).