KVPY 2020-21 SA Exam Previous Papers

Question : 75 of 80

Marks: +1, -0

The isotherms of a gas are shown below:

Among the following,(i) At

T_1

, the gas cannot be liquified
(ii) At point B, liquid starts to appear at

T_2

(iii)

T_C

is the highest temperature at which the gas can be liquified
(iv) At point A, a small increase in pressure condenses the whole system to a liquid
The correct statements are:

Only (i) and (ii)
Only (i), (iii) and (iv)
Only (ii), (iii) and (iv)
(i), (ii), (iii) and (iv)

Validate

Solution:

● Above critical temperature (

T_C

), gas cannot liquify even applying high pressure.
● At point B, liquid starts to appear at

T_2

. While at point A, a small increase in pressure condenses the whole system to a liquid.

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