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| Q. |
What is the point at which all the three phases of a system exist? |
| A. | triple point |
| B. | sublimation point |
| C. | vapor point |
| D. | eutectic point |
| Answer» A. triple point | |
| Explanation: since at the triple point, the degree of freedom is zero (that is invariant reaction takes place at that point), therefore according to phase rule, f=c-p+2. | |
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