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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:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Write short answer.
What are man-made changes ?
State whether the following is physical or chemical changes.
glowing of a bulb -
Write true or false
Rusting of iron is a chemical change.
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Gas exists in three states as solid, liquid, and gas.
Which of the following is not a physical change?
