Question

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. Chemical changes are
(a) always irreversible (b) always reversible (c) mostly irreversible (d) mostly reversible ●
4. During the dissolution of urea, heat
(a) is absorbed
(b) is evolved
(c) does not change
(d) none of these●
(HINT : When urea is dissolved in water cooling is observed​

Answer 1

Answer:

2-c

3-a

4-a

Hope it helps u...

Answer 2

2.a.

3.c

4.c

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