With increase in the value of pressure p, the plot of compression factor Z versus pressure p of the H₂ gas at 0°C

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increase

decreases

first decreases, attains a minimum value followed by an increase

first increases, attains a maximum value followed by a decrease

answer is A.

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Detailed Solution

At high pressures, the gas molecules are very close to each other, and the repulsive forces between them become significant.
This results in a further decrease in the compression factor, indicating that the gas occupies an even smaller volume than expected based on the attractive forces alone.
However, at very high pressures, the repulsive forces between the gas molecules cause them to occupy a larger volume than expected based on ideal gas behavior.
This leads to an increase in the value of the compression factor.
Therefore, the plot of compression factor Z versus pressure p of H₂ gas at 0°C shows a downward curvature, with Z initially close to 1 and decreasing as pressure increases, before eventually increasing again at very high pressures.

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