Advertisements
Advertisements
प्रश्न
Chemical reactions may proceed with absorption of heat. Give an example.
Advertisements
उत्तर
Chemical reaction is characterised by absorption of heat:
\[\ce{\underset{\text{nitrogen}}{N2} + \underset{\text{oxygen}}{O2} + ->[3000°C]\underset{\text{nitrogen monoxide}}{2NO (g)}}\]
APPEARS IN
संबंधित प्रश्न
State the effect of an exothermic reaction on the surroundings.
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.
Complete the following statement.
On heating, hydrated copper sulphate changes its colour from ________ to __________.
What do you observe? When
Lead nitrate is heated.
Differentiate between the following:
A catalyst and a promoter.
Classify the following reaction into Exothermic and Endothermic reactions.
Magnesium ribbon when burned in air, it forms magnesium oxide.
Match the following:
| Colum I | Column II | ||
| 1. | Alloying | a. | Exothermic change |
| 2. | Crystallization | b. | Periodic change |
| 3. | Soap powder + water | c. | Mixing of molten solids |
| 4. | Seasonal changes | d. | Pure solid |
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 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 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.
