NTSE Stage 2 SAT 2018 Exam Question Paper

Question : 15 of 100

Marks: +1, -0

100 g of oxygen

(O_2)

gas and 100 g of helium (He) gas are taken in separate containers of equal volume at 100°C. Which one of the following List I List II (Mixture to be separated) (Method used) A. Petroleum products I. Chromatography B. Camphor and rock salt II. Centrifugation C. Cream from milk III. Sublimation D. Coloured components in a dye IV. Fractional distillation statement is correct?

Both gases would have the same pressure.
The average kinetic energy of $O_2$ molecules is greater than that of He moleules.
The pressure of He gas would be greater than that of the $O_2$ gas.
The average kinetic energy of He and $O_2$ molecules is same.

Validate

Solution:

According to ideal gas equation,
PV=nRT
∴ P ∝ n at constant V and T

{n}_{1}({O}_{2})=\;\;{100}/{32}=3.125{mole}

{n}_{2}({He})=\;\;{100}/{4}=25{mole}

n_2 > n_1

; thus

P_{He} > P_{O_2}

Go to Question:

Prev Question

Next Question