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प्रश्न
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
पर्याय
True
False
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उत्तर
False.
Correct Statement: Melting of butter and wax are examples of physical changes.
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संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Write short answer.
Sublimation is classified as a physical change. Why ?
State whether the following is physical or chemical change.
Digestion of food —
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
What will you take into account while identifying the following?
A chemical change in a substance.
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
Gas exists in three states as solid, liquid, and gas.
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
