Match the items in column A with the items in column B. Column A Column B 1. Latent heat of vaporisation of water a. No definite volume 2. Latent heat of fusion of ice b. Incompressible 3. Solid c. One Surface 4. Liquid d. 3 . 35 × 10 5 J kg - 1 5. Gas e. 22 . 6 × 10 5 J kg - 1

1. Latent heat of vaporisation of water is 22 . 6 × 10 5 J kg - 1 . The quantity of heat energy required to change 1 Kg of liquid into vapour at atmospheric pressure at its boiling point without any change of temperature is called the latent heat of vaporisation. 2. Latent heat of fusion of ice is 3 . 35 × 10 5 J kg - 1 . The quantity of heat energy required to change 1 Kg of ice into water at atmospheric pressure at its melting point without any change of temperature is called the latent heat of fusion of ice. 3. Solid is incompressible. They have closely packed molecules. 4. Liquid has one surface because the force of attraction is less between the atoms which do not allow it to have more than one free surface. 5. Gases have no definite volume. Their molecules are loosely packed. Column A Column B 1. Latent heat of vaporisation of water e. 22 . 6 × 10 5 J kg - 1 2. Latent heat of fusion of ice d. 3 . 35 × 10 5 J kg - 1 3. Solid b. Incompressible 4. Liquid c. One surface 5. Gas a. No definite volume

E M B I B E

LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q C

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9th CBSE

IMPORTANT

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The temperature at which a solid change into a liquid is called .

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Important Questions on Matter in Our Surroundings

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q C

Boiling is a _____ (surface / bulk) phenomenon.

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q C

The conversion of vapours into solid without passing through the liquid state is called _____ (sublimation/ deposition).

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9th CBSE

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LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q C

The SI unit of latent heat of fusion is _____.

$A : J {kg}^{- 1} B : J g^{- 1}$ (Enter your correct answer as $A$ or $B$ )

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9th CBSE

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LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q C

The diameter of the molecules of substance is of the order of

10^{- n}

. The value of n will be _____.

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q C

The arrangement of particles is less ordered in the _____ state.

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q D

Tabulate differences between solid and liquid.

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q D

Tabulate differences between liquid and gas.

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q F

Match the items in column A with the items in column B.

Column A	Column B
1. Latent heat of vaporisation of water	a. No definite volume
2. Latent heat of fusion of ice	b. Incompressible
3. Solid	c. One Surface
4. Liquid	d. $3.35 \times 10^{5} J {kg}^{- 1}$
5. Gas	e. $22.6 \times 10^{5} J kg^{- 1}$

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