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Question
Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?
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Solution
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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RELATED QUESTIONS
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 |
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The reaction can be classified as:
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\[\ce{4HNO3->4NO2 + 2H2O + O2}\]
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Displacement reaction or substitution reaction
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Direct combination reaction of sulphur dioxide with water gives ________.
