Class-9 - Chemistry - Chapter-1 - Matter in our surroundings

Which of the following has highest kinetic energy?

• Particles of ice at 0 °C

• Particles of water at 0 °C

• Particles of water at 100 °C

• Particles of steam at 100 °C

Which of the following is most suitable for summer?

• Cotton

• Nylon

• Polyester

• Silk

The color of vapors formed on sublimation of iodine solid is

• Purple (violet)

• Colorless

• Yellow

• Orange

Under which of the following conditions we can boil water at room temperature?

• At low pressure

• At high pressure

• At very high pressure

• At atmospheric pressure

Which of the following does not affect rate of evaporation?

• Wind speed

• Surface area

• Temperature

• Insoluble heavy impurities

Kinetic energy of molecules is directly proportional to

• Temperature

• Pressure

• Both (a) and (b)

• Atmospheric pressure

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

(i) Increasing pressure on hydrogen contained in a closed container

(ii) Some hydrogen gas leaking out of the container

(iii) Increasing the volume of the container of hydrogen gas

(iv) Adding more hydrogen gas to the container without increasing the volume of the container

• (i) and (iii)

• (i) and (iv)

• (ii) and (iii)

• (ii) and (iv)

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is

• Krypton

• Kerosene

• Carbon steel

• Carbon dioxide

On converting 308 K, 329 K and 391 K to Celsius scale, the correct sequence of temperatures will be:

• 33°C, 56°C and 118°C

• 35°C, 56°C and 119°C

• 35°C, 56°C and 118°C

• 56°, 119°C and 35° C

When a gas jar full of air is placed upside down on a gas jar full of bromine vapors, the red-brown vapors of bromine from the lower jar go upward into the jar containing air. In this experiment:

• Air is heavier than bromine

• Both air and bromine have the same density

• Bromine is heavier than air

• Bromine cannot be heavier than air because it is going upwards against gravity