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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
Complete and balance the following chemical equations:
N2 + O2 →
TRUE \ FALSE
Copper can displace iron from iron sulphate.
A chemical equation is a statement that describes a chemical change in terms of
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
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 hydrochloric acid to silver nitrate.
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 – Thermal decomposition of mercury [II] oxide.
When magnesium is burnt in the air, a new substance is formed which is ______.
Galvanization is a process in which ______ is coated as a layer of iron.
