Question

(b) tearing a piece of paper
(d) digestion of food
(b) evaporation of a liquid (c) burning of a candle (d) moving of a wheel
MULTIPLE CHOICE
ollowing is not a bhusical chone correct answer
1. Which of the following is not a physical change ?
(a) melting of wax
(c) dissolution of salt in water
2. Which of the following is a chemical change?
(a) breaking of a brick
3. Chemical changes are
(a) always irreversible
(b) always reversible
4. During the dissolution of urea, heat
(a) is absorbed
(b) is evolved
(HINT : When urea is dissolved in water cooling is observed]
(c) mostly irreversible (d) mostly reversible
(c) does not change
(d) none of these​

Answer 1

Answer:

(1)melting of wax

(2)breaking of brick

(3)always irreversible