Question

The given graph represents the cooling curve of substance X. Which of the following statements are incorrect?

I. Process 1 represents the cooling of the liquid state of X, while process 2 involves the cooling of the solid state.
II. The freezing point of substance X is 25 ${}^o$C.
III. At 35 ${}^o$C, the substance exists in solid state.
IV. Substance X exists both in gaseous and liquid forms along the curve QR.

• A. I and III
• B. II and IV only
• C. None of the above
• D. III and IV only

Answer 1

The correct option is A I and III

Option 'A' i.e. I and III is the correct answer.