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प्रश्न
Write true or false
Deforestation is a man-made change.
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
State whether the following is physical or chemical changes.
glowing of a bulb -
Write true or false
A natural change can also be a desirable 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
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
In a solution of salt in water, water is the solute
______ is the substance that is dissolved in a solvent.
