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प्रश्न
Supply of energy may be required to initiate a reaction. State the different forms with a suitable example of reactions initiated by the supply of energy.
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उत्तर
Different forms of energy:
(i) Heat energy: \[\ce{N2 + O2 ->[3000^{°}C] 2NO}\]
(ii) Light energy: \[\ce{H2 + Cl2 ->[Sunlight] 2HCl}\]
(iii) Electricity: \[\ce{\underset{[acidified]}{2H2O}->[Electric][Current] \underset{[cathode]}{2H2} + \underset{[anode]}{O2}}\]
(iv) Pressure: \[\ce{N2 + 3H2 <=>[Fe/450-500°C][200 atmos.pressure] 2NH3}\
(v) Catalyst: \[\ce{4HN3 + 5O2 -> [Pt./800°C] 4NO + 6H2O}\]
(vi) Sound Energy: \[\ce{\underset{[acetylene]}{C2H2}->[Sound][Energy] 2C + H2}\]
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संबंधित प्रश्न
Identify the endothermic and exothermic reaction.
\[\ce{CaCO_{3(s)}->[\Delta] CaO_{(s)} + CO2}\]
Why energy is involved in a chemical change?
State the effects of endothermic and exothermic reactions on the surroundings.
Name a nitrate which produces oxygen as the only gas.
Give an example of the following chemical changes.
An exothermic and an endothermic reaction involving carbon as one of the reactants.
Explain the term energy changes in a chemical change or reaction.
Give an example with a balanced equation, of the following reaction:
photochemical reaction
Complete the following table:
| Chemical Reactions | Name reaction type |
| \[\ce{C(s) + O2(g) -> CO2(g)}\] | (a) ________ |
| \[\ce{Zn(s) + CuSO4(aq) ->}\] (b) _________ | Displacement reaction |
| \[\ce{2Cu(s) + O2(g) ->[heat] 2CuO(s)}\] | (c) _________ |
| \[\ce{C(s) + 2H2(g) -> CH4(g)}\] | (d) _________ |
| \[\ce{CaO(s) + H2O(l) -> Ca(OH)2(aq) + heat}\] | (e) _________ |
| \[\ce{CaCO3(s) + Heat ->}\] (f) _________ | Endothermic Reaction |
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.
