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प्रश्न
Photosynthesis is a chemical reaction that takes place in the presence of ______.
उत्तर
Photosynthesis is a chemical reaction that takes place in the presence of Sunlight.
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संबंधित प्रश्न
FILL IN THE BLANK
In a ............ change, new substances are formed.
What are biocatalysts ?
Fill in the blank
A new substance is always formed in a _______ change.
Define chemical reaction.
Explain the following reaction with one suitable example of Displacement reaction.
Complete and balance the following reaction:
\[\ce{Pb(NO3)2 ->[\Delta]}\]
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
Classify the following processes into physical or chemical changes:
(i) Beating of aluminium metal to make aluminium foil.
(ii) Digestion of food.
(iii) Cutting of a log of wood into pieces.
(iv) Burning of crackers.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think the formation of rust from iron is a chemical change?
