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प्रश्न
Define endothermic reactions. Give two examples of each.
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उत्तर
Endothermic reaction: A chemical reaction in which heat is absorbed is called endothermic reaction. It causes fall in temperature.
e.g. (i) When nitrogen and oxygen together are heated to a temperature of about 3000°C, nitric oxide gas is formed.
N2 + O2 + heat → 2NO (g)
(ii) Decomposition of calcium carbonate into carbon dioxide and calcium oxide when heated to a 1000°C.
CaCO3 + Heat → CaO (s) + CO2 (g)
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संबंधित प्रश्न
State the effect of an exothermic reaction on the surroundings.
FILL IN THE BLANK
In a................ reaction heat energy is absorbed.
Give scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
What do you observe? When
Lead nitrate is heated.
State which type of chemical reaction proceeds with evolution of heat energy.
Give an example with a balanced equation, of the following reaction:
photochemical reaction
Give an example with a balanced equation, of the following reaction:
electrochemical reaction
Select the correct answer from the options given below:
State the gaseous product formed, when
An exothermic reaction takes place between ammonia and neutral gas.
Give a scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
Give scientific reasons.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
