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प्रश्न
Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?
उत्तर
A decomposition reaction brought about by heat is known as thermal decomposition.
\[\ce{2HgO_(_s_) ->[\Delta] 2Hg_(_s_) + O2_(_g_)}\]
A simultaneous reversible decomposition reaction brought about only by heat is thermal dissociation.
NH4Cl ⇋ NH3 +HCl
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संबंधित प्रश्न
Explain the types of reaction with reference to oxygen and hydrogen. Illustratre with examples.
Decomposition reactions can occur by sunlight.
Give two balanced reactions.
Select the correct salt from list II which on thermal decomposition exhibits the change in colour from list I.
| List I | List II |
| 1. Light green to black | A: Copper carbonate |
| 2. White to yellow [heated state] | B: Hydrated Copper sulphate |
| 3. Blue to black | C: Copper nitrate |
| 4. Orange to green | D: Ammonium dichromate |
| 5. Blue to white | E: Zinc nitrate |
State which of the substance given below evolve oxygen gas on thermal decomposition.
Trilead tetroxide
State which of the substance given below evolve oxygen gas on thermal decomposition.
Mercury [II] oxide
Give a balanced equation for a direct combination reaction involving:
Two elements – one of which is a neutral gas and the other a monovalent metal
Give a balanced equation for the preparation of two different insoluble lead salts from their salt solutions by double decomposition precipitation.
Convert a soluble base to their respective soluble salts by neutralization reaction.
Give a balanced equation for the following type of reaction:
A direct combination reaction between phosphorus and neutral gas.
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II |
| 1. \[\ce{AB⇌[heat]A + B}\] | A: Double decomposition |
| 2. \[\ce{AB->A + B}\] | B: Thermal dissociation |
|
3. \[\ce{X+Y- + AB+B- ->X+B- + A+Y-}\] |
C: Endothermic reaction |
| 4. \[\ce{X + YZ->XZ + Y}\] | D: Displacement reaction |
| 5. \[\ce{X + Y->[heat]XY - \Delta}\] | E: Decomposition reaction |
