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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.
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
Write true or false for the statement
A natural change can also be a desirable change
Tick the most appropriate answer.
Physical changes are
Classify the following as a physical or a chemical change.
Butter getting rancid
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
What type of change is colouring of a paper?
When solute is dissolved in a solvent it forms a solution.
