At absolute zero, the entropy of a pure crystal is zero. This is

Options

A. First law
B. Second law
C. Third law
D. None

Explanation

To solve the question, we need to understand the concept behind the statement "At absolute zero, the entropy of a pure crystal is zero." This statement is a reflection of the third law of thermodynamics.

### Step-by-Step Solution:

1. **Understanding Absolute Zero**:
- Absolute zero is defined as 0 Kelvin (K), which is equivalent to -273.15 degrees Celsius. At this temperature, the thermal motion of particles is minimal.

2. **Definition of Entropy**:
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