| Direction: For question given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below |
| Assertion Burning of wood is a physical change. |
| Reason During burning of wood, new substances which cannot be changed are formed. |
A) Both A and R are true and R is correct explanation of the A.
B) Both A and R are true but R is not the correct explanation of the A.
C) A is true but R is false.
D) A is false but R is true.
Correct Answer: D
Solution :
[d]| Assertion is incorrect but Reason is correct. |
| Burning of wood is a chemical change as new substances like \[{{\operatorname{CO}}_{2}}\] is formed which cannot be changed back. |
| (i) Wood is a mixture because it contains compounds such as cellulose, lignin which are composed of elements like carbon, hydrogen and oxygen. |
| (ii) Common salt, which is sodium chloride (Nad) made up of two elements in fixed proportion is a compound. |
| (iii) Iron sulphide (FeS) is formed which is a compound, composed by two elements. |
| (iv) Distilled water and tap water have different taste and different constituents. |
| Distilled water has pure \[{{\operatorname{H}}_{2}}\operatorname{O}\] molecules while tap water may contain other molecules also. |
| (v) Blood is a mixture which contains different types of cells, salts, water, hormones, etc. |
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