The metal which cannot liberate hydrogen from acid is

Options

A. platinum
B. silver
C. gold
D. All of these

Explanation

To determine which metal cannot liberate hydrogen from acids, we need to refer to the reactivity series of metals. The reactivity series is a list that ranks metals based on their ability to displace hydrogen from acids. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understand the Reactivity Series**: The reactivity series lists metals in order of their reactivity with acids. The more reactive metals can displace hydrogen from acids, while less reactive metals cannot.

2. **Identify the Position of Metals**: In the reactivity series, the following metals are listed from most reactive to least reactive:
- Potassium
- Sodium
- Calcium
- Magnesium
- Aluminium
- Carbon
- Zinc
- Iron
- Tin
- Lead
- Hydrogen
- Silver
- Gold
- Platinum

3. **Locate Hydrogen in the Series**: Hydrogen is positioned in the middle of the reactivity series. Metals that are above hydrogen can displace it and liberate hydrogen gas when they react with acids.

4. **Identify Metals Below Hydrogen**: The metals that are below hydrogen in the reactivity series (i.e., less reactive than hydrogen) include:
- Silver
- Gold
- Platinum

5. **Conclusion**: Since silver, gold, and platinum are all below hydrogen in the reactivity series, they cannot displace hydrogen from acids. Therefore, they will not liberate hydrogen gas when they react with acids.

6. **Final Answer**: The metals that cannot liberate hydrogen from acids are Silver, Gold, and Platinum. Hence, the correct answer is **option D: All of these**.