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प्रश्न
Chemical reactions may proceed with absorption of heat. Give an example.
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उत्तर
Chemical reaction is characterised by absorption of heat:
\[\ce{\underset{\text{nitrogen}}{N2} + \underset{\text{oxygen}}{O2} + ->[3000°C]\underset{\text{nitrogen monoxide}}{2NO (g)}}\]
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संबंधित प्रश्न
What do you observe when Ammonia is brought in contact of hydrogen chloride.gas.
Define exothermic reactions. Give two examples of each.
What do you observe when ammonium chloride is dissolved in water.
FILL IN THE BLANK
In a................ reaction heat energy is absorbed.
Give scientific reasons.
While preparing dil. Sulphuric acid from concentrated conc. sulphuric acid in the laboratory the concentrated sulphuric acid is, add slowly to water with constant stirring.
State which type of chemical reaction proceeds with evolution of heat energy.
Assertion: A drop of petrol when touched with finger gives a chill feeling.
Reason: The above phenomenon is an endothermic one.
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.
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.
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.
