Dalton’s law Worksheet

Dalton’s law states that, “The total pressure exerted by a gaseous mixture is equal to the sum of the pressure of the parts.”

Mathematical formula to explain Dalton’s law :

PressureTotal = Pressure 1 + pressure2 + Pressuren


In this article you can find some questions related to Dalton’s law and graham’s law of Diffusion with their answers:



1. Three gases A, B, C are enclosed in a container and have partial pressures as p_1, p_2, p_3 respectively at T Kelvin. The total pressure at T Kelvin will be:

(a)    always equal to (P_1 + P_2 + P_3)

(b)   equal to (P_1 + P_2 + P_3)only if gases do not react with one another

(c)    greater than (P_1 + P_2 + P_3)

(d)   less than (P_1 + P_2 + P_3)


2. Under similar conditions which of the following gases will diffuse four times as quickly as oxygen?

(a)    He

(b)   H_2

(c)    N_2

(d)   CH_4


3. Which of the following gases is heavier than dry air?

(a)    Pure N_2

(b)   Pure Cl_2

(c)    Moist air

(d)   All of these


4. Which expression gives the rates of diffusion of two gases at same temperature but different pressure?

(a)    \dfrac{r_1}{r_2} = \dfrac{\sqrt{P_1} d_1}{\sqrt{P_1} d_2}

(b)   \dfrac{r_1}{r_2} = \dfrac{P_1}{P_2} \dfrac{\sqrt{d_2}}{\sqrt{d_1}}

(c)    \dfrac{r_1}{r_2} = \dfrac{P_2}{P_1} \dfrac{\sqrt{d_2}}{\sqrt{d_1}}

(d)   \dfrac{r_1}{r_2} = \dfrac{P_1^2}{P_2^2} \dfrac{\sqrt{d_1}}{\sqrt{d_2}}


5. A gas diffuses at twice the rate of that of oxygen under same conditions of temperature and pressure. The molecular mass of the gas will be:

(a)    64

(b)   8

(c)    16

(d)   2



1.(b)     2. (b)     3. (b)     4. (b)     5. (b)

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