Which among the following pairs possess low melting points ?

Options

A. Megnesium, mercury
B. Mercury, manganese
C. Sodium, potassium
D. Calcium. Manganese

Explanation

To determine which pair possesses low melting points, we will analyze the options provided. Here’s a step-by-step solution:

### Step 1: Understanding Melting Points
- Melting point is the temperature at which a solid becomes a liquid. Substances with low melting points require less energy to break the bonds between their particles.

### Step 2: Analyzing the Pairs
- We need to compare the pairs given in the options. For this example, we will focus on sodium and potassium as mentioned in the transcript.

### Step 3: Properties of Sodium and Potassium
- Sodium (Na) and Potassium (K) are both alkali metals. They are known for having low melting points compared to many other metals.

### Step 4: Force of Attraction Between Particles
- The melting point is influenced by the force of attraction between the particles. In sodium and potassium, the forces of attraction are relatively weak.
- This weak attraction leads to a loosely packed structure, making it easier for the particles to move apart when heated.

### Step 5: Conclusion
- Therefore, sodium and potassium possess low melting points due to their weak inter-particle forces and loosely packed structure.

### Final Answer
- The pair that possesses low melting points is **Sodium and Potassium**.

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