EASY
Earn 100

Dry ice sublimates at a temperature of -78.5 °C at earth's atmospheric pressure. 

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Important Questions on Matter in our Surroundings

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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which of the following is not a pollutant?
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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?

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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which of the following curves best represents the variation in density of water with temperature?
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Physical state of water at 0°C is
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
The melting point of ice is _____.
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Dry ice is
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Useful substance in preparation of freezing mixture is 
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
The following statements apply to SO2 but NOT to H2S:
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which gas boils out first during fractional distillation of air.
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Latent heat of vaporisation is 
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which of the following does not undergo sublimation?
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
"Complete melting of ice cream will not happen suddenly". Explain.
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Which of the following compound can not be sublimed?
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.
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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

The latent heat of vaporisation of water is _____.

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Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
Draw a sketch for an experimental set-up for sublimation.
MEDIUM
Science>Chemistry>Matter in our Surroundings>Interconversion of Matter
The latent heat of fusion of ice is _____.
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?

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

Why does the temperature remain constant during the change of state?

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).