Question

Give reasons for the following
1)Electric wires between the poles are not strung tightly
2)Burning of coal is an irreversible change
3)Empty mineral water bottle,when kept in freezer,shrinks
4)In the process of digestion both physical and chemical changes take place simultaneously
5) Silver ornaments turn black when kept outside​

Answer 1

Answer:

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Explanation:

(a) Burning of wood and coal causes pollution of air.

(b) A liquid fuel, used in homes is Liquefied Petroleum Gas(LPG).

(c) Fuel must be heated to its ignition temperature before it starts burning.

(d) Fire produced by oil cannot be controlled by water.

Answer 2

Answer:

Burning of wood and coal causes pollution of air.

Burning of wood and coal causes pollution of air.(b) A liquid fuel, used in homes is Liquefied Petroleum Gas(LPG).

Burning of wood and coal causes pollution of air.(b) A liquid fuel, used in homes is Liquefied Petroleum Gas(LPG).(c) Fuel must be heated to its ignition temperature before it starts burning.

Burning of wood and coal causes pollution of air.(b) A liquid fuel, used in homes is Liquefied Petroleum Gas(LPG).(c) Fuel must be heated to its ignition temperature before it starts burning.(d) Fire produced by oil cannot be controlled by water.