Question

WURRSHEET b-B
Physical and Chemical Changes
A. Tick the correct answer.
1. Which of the following is not a physical change?
aj melting of wax
(o) tearing a piece of paper
c) dissolution of salt in water
(d) digestion of food
2. Which of the following is a chemical change?
a) breaking of a brick
(b) evaporation of a liquid
(c) burning of a candle
(d) moving of a wheel
3. During the dissolution of urea, heat
(a)is absorbed
(b) is evolved
(d) does not change
(d) none of these
B. Circle the odd-one out giving appropriate reason.
1. Buming of wood, Ageing of living beings. Stretching of rubber band, Rusting of iron
2. Change in colour. Change in temperature, Physical change. Breaking of a stick. Curding of milk
3. Sublimation, Ammonium chloride, Sublimate. Evaporation, Melting of a solid
4. Magnesium ribbon. Dazzling light, Chemical change, Exothermic reaction. Crystallisation

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Answer 1

Answer:

Explanation:

1.c

2.b

3.b

B

1,3

Answer 2

1) dissolution of salt in water
2) evaporation of a liquid
3) is evolved
Hope its help to you