Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: Compressibility factor for hydrogen varies with pressure with positive slope at all pressures. Reason: Even at low pressure, repulsive forces dominate hydrogen gas.A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: A
Solution :
In case of H, compressibility factor (Z) increases with pressure. At \[273K,Z>1\], which show that it is difficult to compress the gas as compared to ideal gas. In this case repulsive forces dominate. Note: For ideal gases, \[Z=1\] For real gases \[Z\ne 1\] If \[Z<1\], negative deviation and the gas is more compressible than expected. If \[Z<1\], positive deviation and the gas is less compressible than expected.
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