JEE Main levelSingle correct optionDifficulty 2 of 3rg106
As the temperature of a gas is raised from well below to well above its Boyle temperature, the second virial coefficient B
Adecreases from positive to negative values
Bincreases from negative to positive values
Cremains constant
Dis always zero
Answer: B
At low T attraction dominates and B is negative. As T increases the term a/RT shrinks, B=b−a/RT rises, passes through zero at TB and becomes positive (approaching b for a van der Waals gas).