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प्रश्न
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
पर्याय
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)
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उत्तर
(i) and (ii)
The processes in statements (i) and (ii) are chemical changes because decaying and burning causes formation of new compounds; thus they are chemical reactions. The processes in statements (iii) and (iv) are physical changes where no new compounds are formed.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Write true or false for the statement.
Deforestation is a man-made change
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Write true or false
Deforestation is a man-made change.
Write true or false
Decomposition of leaves is a fast change.
What are man-made changes ?
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
