A hard and resistant metal (alloy) genrally used in tip of nib of fountain pen is

Options

A. Os. Ir
B. Pt.Cr
C. V.Fe
D. Fe.Cr

Answer

To determine the hard and resistant metal alloy generally used in the tip of a fountain pen, we can follow these steps:

### Step 1: Understand the requirements
The question specifies that we need a hard and resistant metal alloy. This means we are looking for materials that have high durability and can withstand wear and tear.

**Hint:** Consider the properties of metals and alloys that make them suitable for high-friction applications.

### Step 2: Identify common materials used in fountain pen nibs
Fountain pen nibs are typically made from materials that provide a smooth writing experience and are resistant to corrosion. Common materials include various alloys.

**Hint:** Think about metals that are known for their hardness and resistance to corrosion.

### Step 3: Consider the options given
The options provided are:
1. Osmium, Iron
2. Platinum, Chromium
3. Vanadium, Iron
4. Iron, Chromium

**Hint:** Evaluate each option based on the properties of the metals listed.

### Step 4: Analyze the best option
- **Osmium, Iron:** Osmium is very hard but not commonly used in nibs due to its brittleness.
- **Platinum, Chromium:** Platinum is known for its corrosion resistance and durability, while chromium adds hardness. This combination is ideal for nibs.
- **Vanadium, Iron:** While vanadium can increase strength, this combination is not typically used for nibs.
- **Iron, Chromium:** This combination is used in some applications but does not provide the same level of resistance and smoothness as platinum and chromium.

**Hint:** Focus on the combination that provides both hardness and corrosion resistance.

### Step 5: Conclusion
The best choice for a hard and resistant metal alloy used in the tip of a fountain pen is **Platinum and Chromium**.

**Final Answer:** Option 2: Platinum, Chromium