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For a general substance A the phase diagram is represented as shown. Identify the option(s) which is/are correct :

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a
Triple point of the substance is (200 K and 3.8 mm of Hg
b
Standard boiling point of the substance should be slightly less than 400K
c
Above 500K, gas - liquid transition can not occur without change in temperature. 
d
Melting point of the substance will increase with increase in pressure.

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detailed solution

Correct option is A

Triple point is (200K, 5×103atm) (200 K, 5 × 103 × 760 mm of Hg) (200 K, 3.8 mm of Hg) Boiling point slightly less than 400 K Above 500 K, gas-liquid transition can not occur without change in temperature as 500 K is critical point.

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