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Question
Define a photochemical reaction.
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Solution
A chemical reaction that occurs in the presence of light is called a photochemical reaction.
RELATED QUESTIONS
The chemical name of baking soda is ______.
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
What kind of a change is associated with decaying of a plants?
Match the following:
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| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Which of the following is a chemical change?
The reaction of H2 gas with oxygen gas to form water is an example of ______.
