Question

1. Give the conditions necessary for rusting of Iron.
2. Give three examples of physical changes. Explain whether each change is slow or fast,
reversible or irreversible, and man-made or natural.
3
ist​

Answer 1

Answer: 1) Rusting of iron takes place in the presence of moisture and air. So the presence of air and water vapor in air are two necessary conditions for rusting of iron.

2) (a) Rusting of iron, formation of day and night, ripening of fruits, growing of trees are slow changes.

(b) Burning of paper, stretching of rubber band, blowing of balloons, bursting of crackers are fast changes.

Explanation: