SECTION-4 : (Maximum Marks : 12)

• This section contains TWO (02) paragraphs.

• Based on each paragraph, there are TWO (02) questions.

• The answer to each question is a NUMERICAL VALUE.

• For each question, enter the correct numerical value of the answer using the mouse and the onscreen virtual numeric keypad in the place designated to enter the answer.

• If the numerical value has more than two decimal places, truncate/round-off the value to TWO decimal places.

• Answer to each question will be evaluated according to the following marking scheme:

Full Marks : +3 If ONLY the correct numerical value is entered in the designated place;

Zero Marks : 0 In all other cases.

"PARAGRAPH I"

The entropy versus temperature plot for phases a and p at 1 bar pressure is given. st and So are entropies of the phases at temperatures T and 0 K, respectively.

The transition temperature for to phase change is 600 K and = 1 J mol -1 K -1 . Assume is independent of temperature in the range of 200 to 700 K. and are heat capacities of and phases, respectively.

The value of entropy change, (in J mol -1 K -1 ), at 300 K is__.

[Use : In 2 = 0.69 Given : = 0 at 0 K]