Question

1
Q.3 Match the examples of changes in List I with the correct type in List II.
[51
LIST I
LIST II
1. Expansion of a steel rod on heating
A: Physical
2. Rotting of eggs
B: Chemical
3. Milk turning sour
0
4. Tarnishing of copper
5. Separation of naphthalene from a mixture of naphthalene & sodium chloride.
Q.4 Fill in the blanks with the correct words for each of the statements given below: [5]
1. Sublimation is
[considered/not considered] a change of state of matter.
2. Sublimation involves a
[chemical/physical] change.
3. During sublimation a solid on heating turns directly into
[liquid/vapour] &
on cooling back to
[solid/liquid]
4. Ammonium chloride, a sublimable solid undergoes [synthesis/ dissociation) on heating.
5. Sublimation of iodine is an example of [physical/ chemical] change.
Q.5 Name the following.
[5]
1. The product/s obtained during 'photosynthesis' - which is a chemical change.
2. The term involved in the change of state from - 'water to ice' - which is a physical change.
3. The final product of the physical change involved during - 'melting of a piece of wax'.
4. The type of change i.e. physical or chemical involved - 'during respiration in human beings'.
5. The type of change i.e. physical or chemical involved - 'when a substance undergoes a
change in state, colour or size'.​

Answer 1

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