JEE Main 2014 · 9 Apr · Shift 1 · Chemistry Q39

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ChemistrySingle correct+4 / -1Question 39 of 90

The temperature at which oxygen molecules have the same root mean square speed as helium atoms have at 300 K is : (Atomic masses : He = 4 u, O = 16 u)

300 K

600 K

1200 K

2400 K

Answer and worked solution

Official answer: D

$v_{\text{rms}}\propto\sqrt{T/M}$ :
$\frac{T}{32}=\frac{300}4\implies T=2400\text{ K}.$

Topics:Kinetic theory of gases

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JEE Main 2014 · 9 Apr · Shift 1, Chemistry question 39