Question

3. Burning is a
(a) slow process
(b) fast process
(c) natural process
(d) none of the above

4. Which one of the following is volatile in nature
(a) common salt
(b) petrol
(C) water
(d) milk

5. An example of both physical and chemical change is
(a) burning of candle
(b) melting of ice
(c) cooking of food
(d) glowing of bulb

6. The compound rust is a hydrated oxide of
(a) copper
(b) aluminium
(c) iron
(d) gold

7. When sugar is heated, its colour changes into
(a) red
(b) blue
(c) black
(d) grey

8. A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of
(d) grey
(a) oxygen gas
(b) hydrogen gas
(c) nitrogen gas
(d) water vapour

9. When we add water to the following substances, which one will show a chemical change?
(b) sugar
(a) salt
(c) oil
(d) quick lime​

Answer 1

Answer:

1. none of the above

2. Petrol

3. burning of a candle

4. iron

5. black

6. hydrogen gas

7. Quick lime

Answer 2

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• 3) none of the above
• 4) petrol
• 5) burning of candle
• 6) iron
• 7) black
• 8) hydrogen gas
• 9) quick lime