| Direction: Q. 21 to 25 |
| Read the following and answer questions from [21] to [25]. |
| Cooking oil and water both are liquid but their chemical properties are different. They differ in odour and inflammability. Oil bums in air whereas water extinguishes fire. It is the chemical property of oil that makes it different from water. |
| During a chemical change, one substance reacts with other to undergo a change in chemical compositions. A chemical change as also called a chemical reaction. |
| Sometimes both physical and chemical changes take place together. |
| Generally, physical changes do not involve the production of energy while chemical changes usually involve the production of energy. Ecosystems have many chemical and physical changes happening all at once and matter is conserved in each and everyone. In any physical or chemical change, matter does not appear or disappear. |
A) size
B) temperature
C) phase
D) proportions
Correct Answer: D
Solution :
[d] During a chemical change, the composition or proportion of matter changes.
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