Calculate the density of ${\mathrm{NH}}_3$ at $30 °\mathrm{C}$ and $5 \mathrm{atm}$ pressure?

Important Questions on States of Matter : Gases and Liquids

EASY

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-1>Chapter 6 - States of Matter : Gases and Liquids>QUESTIONS>Q 17

Calculate the total number of electrons present in $1.6 \mathrm{gms}$ of methane.

EASY

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-1>Chapter 6 - States of Matter : Gases and Liquids>QUESTIONS>Q 18

An open vessel at $27 °\mathrm{C}$ is heated until three fifth of the air in it has been expelled. Assuming that the volume of the vessel remains constant, find the temperature to which the vessel has been heated?

EASY

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-1>Chapter 6 - States of Matter : Gases and Liquids>QUESTIONS>Q 19

Oxygen is present in a litre flask at a pressure of $76\times {10}^{-10} \mathrm{mm}$ of $\mathrm{Hg}$. Calculate the number of oxygen molecules in the flask at $0 °\mathrm{C}$.

EASY

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-1>Chapter 6 - States of Matter : Gases and Liquids>QUESTIONS>Q 20

When $2 \mathrm{gms}$ of a gas $\mathrm{A}$ is introduced into an evacuated flask kept at $25 °\mathrm{C}$, the pressure is found to be one atmosphere. If $3 \mathrm{gms}$ of another gas $\mathrm{B}$ is added to the same flask, the total pressure becomes $1.5 \mathrm{atm}$. Assuming ideal gas behaviour, calculate the ratio of molecular weights ${\mathrm{M}}_{\mathrm{A}}:{\mathrm{M}}_{\mathrm{B}}$.

EASY

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-1>Chapter 6 - States of Matter : Gases and Liquids>QUESTIONS>Q 21

$3.7 \mathrm{gms}$ of a gas at $25 °\mathrm{C}$ occupied the same volume as $0.184 \mathrm{gms}$ of hydrogen at $17 °\mathrm{C}$ and at the same pressure. What is the molecular weight of the gas?

EASY

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-1>Chapter 6 - States of Matter : Gases and Liquids>QUESTIONS>Q 22

At $27 °\mathrm{C}$, hydrogen is Ieaked through a tiny hole into a vessel for $20$ minutes. Another unknown gas at the same temperature and pressure, as that of ${\mathrm{H}}_2$ is leaked through the same hole for $20$ minutes. After the effusion of the gases the mixture exerts a pressure of $6$ atmosphere. The hydrogen content of the mixture is $0.7$ mole. If the volume of the container is $3$ litres, what is the molecular weight of the unknown gas?

EASY

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-1>Chapter 6 - States of Matter : Gases and Liquids>QUESTIONS>Q 23

At room temperature, ammonia gas at one atmospheric pressure and hydrogen chloride gas at $\mathrm{P} \mathrm{atm}$ pressure are allowed to effuse through identical pin-holes from opposite ends of a glass table of one metre length and of uniform Cross-section. ${\mathrm{NH}}_4\mathrm{Cl}$ is first formed at a distance of $60 \mathrm{cm}$ from the end through which $\mathrm{HCl}$ gas is sent in. What is the value of $\mathrm{P}$?

EASY

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-1>Chapter 6 - States of Matter : Gases and Liquids>QUESTIONS>Q 24

A $4:1$ molar mixture of $\mathrm{He}$ and ${\mathrm{CH}}_4$ is contained in a vessel at $20 \mathrm{bar}$ pressure. Due to a hole in the vessel, the gas mixture Ieaks out. What is the composition of the mixture effusing out initially?