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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
True or false
New substances are formed in a chemical change.
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Name: Two carbonates do not produce carbon dioxide on heating.
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
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.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
What changes do you expect?
Which is used as a catalyst during the process of hydrogenation of oils?
Define the following term:
Chemical change
