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प्रश्न
Write true or false
A natural change can also be a desirable change.
विकल्प
True
False
उत्तर
True
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संबंधित प्रश्न
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
State whether the following is physical or chemical changes.
glowing of a bulb -
Fill in the blank
Changes that occur in nature are called ______
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Classify the following as a physical or a chemical change.
Melting of wax
Given reason:
Burning of paper is a chemical change.
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Making sugar solution is a ____________ change.
Mention a few physical properties of a substance.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
