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प्रश्न
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
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उत्तर
Is a chemical change as sulphur (yellowish-green) on burning produces SO2 gas which is acidic in nature and a new substance with new properties is formed
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Solve this crossword by using the clues that follow.
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
Make a list of different types of changes with example.
Define physical change. Give two examples for the above changes.
State whether the following is physical or chemical changes.
shaping a piece of glass —
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Stretching gold coin into a ring is a ______ change.
Give two examples for the following case:
Physical changes which are reversible
Give two examples for the following case:
Physical changes which are not reversible
