EASY
Earn 100

Why solid carbon dioxide is known as dry ice?

Important Questions on Matter in our Surroundings

MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which of the following is not a pollutant?
MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which gas boils out first during fractional distillation of air.
EASY
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which of the following does not undergo sublimation?
EASY
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Physical state of water at 0°C is
MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

When does ice melt at the same temperature 0°C(273 Kelvin), which one of the following has more energy?

MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Dry ice is
MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Latent heat of vaporisation is 
MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
The following statements apply to SO2 but NOT to H2S:
MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Useful substance in preparation of freezing mixture is 
MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which of the following curves best represents the variation in density of water with temperature?
EASY
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which of the following compound can not be sublimed?
EASY
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
"Complete melting of ice cream will not happen suddenly". Explain.
EASY
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
The melting point of ice is _____.
HARD
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
The melting point of naphthalene is 80°C and the room temperature is 30°C. A sample of liquid naphthalene at 100°C is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process.
EASY
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

The latent heat of vaporisation of water is _____.

EASY
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Draw a sketch for an experimental set-up for sublimation.
HARD
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

Why is steam at 100°C a more effective heating agent than water at 100°C?

EASY
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

Define the latent heat of fusion of ice. Give its value.

MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
While determining the boiling point of water in the laboratory, the beaker containing hot water accidentally fell on the hand of a student. A fellow student immediately put cold water on his hand and then placed ice cubes on his hand. He then took the student to the school dispensary for giving him first aid.
A. Define boiling point.
B. Why does temperature remain constant during boiling?
C. How does boiling differ from evaporation?
D. State the values displayed by the fellow student.
EASY
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
The conversion of vapours into solid without passing through the liquid state is called _____ (sublimation/ deposition).