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प्रश्न
Define a photochemical reaction.
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उत्तर
A chemical reaction that occurs in the presence of light is called a photochemical reaction.
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
How do the following help in bringing about a chemical change?
heat.
Define electrolysis.
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Give a chemical test to distinguish between the following gases.
CO2 and SO2
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
NPK are the primary nutrients for plants.
Write a note on the following:
Curdling of milk
