JEE Main 2014 · 9 Apr · Shift 1 · Chemistry Q32

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ChemistrySingle correct+4 / -1Question 32 of 90

Van der Waal's equation for a gas is stated as,
$p=\frac{nRT}{V-nb}-a\left(\frac nV\right)^2.$
This equation reduces to the perfect gas equation, $p=\dfrac{nRT}{V}$ when ,

temperature is sufficiently high and pressure is low.

temperature is sufficiently low and pressure is high.

both temperature and pressure are very high.

both temperature and pressure are very low.

Answer and worked solution

Official answer: A

The corrections $nb$ (molecular volume) and $a(n/V)^2$ (attraction) become negligible when the gas is dilute and fast: high temperature and low pressure.

Topics:Real gases and van der Waals equation

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JEE Main 2014 · 9 Apr · Shift 1, Chemistry question 32