States Of Matter

A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:

• Pressure increases

• Temperature decreases

• Pressure decreases

• Temperature increases

Which of the following property of water can be used to explain the spherical shape of rain droplets?

• Viscosity

• Surface tension

• Critical phenomenon

• Pressure

The interaction energy of London force is inversely proportional to sixth powerof the distance between two interacting particles but their magnitude dependsupon

• Charge of interacting particles

• Mass of interacting particles

• Polarisibility of interacting particles

• Strength of permanent dipoles in the particles

As the temperature increases, average kinetic energy of molecules increases.What would be the effect of increase of temperature on pressure provided thevolume is constant?

• Increases

• Decreases

• Remains the same

• Becomes half

What is SI unit of viscosity coefficient (η)?

• Pascal

• Nsm–²

• km–²s

• N m–²

How does the surface tension of a liquid vary with increase in temperature?

• Remains same

• Decreases

• Increases

• No regular pattern is followed

Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by the increase in temperature?

• Increase

• No effect

• Decrease

• No regular pattern will be followed

The pressure of a 1:4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. What would be the partial pressure of dioxygen?

• 0.8×10⁵ atm

• 0.008 Nm^–2

• 8×10⁴ Nm^–2

• 0.25 atm

Gases possess characteristic critical temperature which depends upon the

magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

Gases _ _ _ _ _ _ _ _ _ H_{2_ _ _ _ _ _} He _ _ _ _ _ _O₂ _ _ _ _ _ _N₂

Critical temperature

(in Kelvin) _ _ _ _ _ _ 33.2 _ _ _ _ 5.3 _ _ _ _ _ _154.3 _ _ _ _126

From the above data what would be the order of liquefaction of these gases?

Start writing the order from the gas liquefying first

• H₂, He, O₂, N₂

• He, O₂, H₂, N₂

• N₂, O₂, He, H₂

• O₂, N₂, H₂, He

Boyles law says

• P $\propto$ V at constant Temperature

• P $\propto$ T at constant Volume

• P $\propto\frac{1}{V}$ at constant Temperature

• P $\propto$ n at constant Temperature & Volume