Chapter 12, Problem 6STP

Interpretation Introduction

Interpretation:

Correct option must be chosen regarding the formation of diamond.

Concept introduction:

Diamond is one of the allotropes of C which is formed at very high pressure.

Answer to Problem 6STP

Correct answer: Option C is correct.

Explanation of Solution

Reason for correct option:

The phase diagram is represented as follows:

Option C is correct as when temperature is less than 3500 K and pressure is more than 100000 atm, carbon exists as diamond.

Conclusion

Reasons for incorrect options: Option A is incorrect as at temperature more than 5000K and pressure less than 100 atm, carbon can exist in vapor and liquid form.

Option B is incorrect as at temperature greater than 6000 K and pressure less than 25 atm, carbon exists in vapor form.

Option D is incorrect as at temperature less than 4500 K and pressure less than 10 atm, carbon exists as graphite form.