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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?
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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
(a) Define the neutralization reaction with an example.
(b) Give a balanced equation for this reaction.
(c) Give three applications of neutralization reactions.
State the type of reactions for the following represent and balance the ones that are not balanced.
2HgO → 2Hg + O2
State the type of reactions for the following represent and balance the ones that are not balanced.
NH4Cl → NH3 + HCl
Match the following:
|
a. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) |
i. Photochemical decomposition |
|
b. \[\ce{2AgCI(s) ->[Sunlight] 2Ag(s) + CI2(g)}\] |
ii. Thermal decomposition |
|
c. \[\ce{2KCI ->[Electricity] 2K + CI2}\] |
iii. Displacement reaction |
|
d. \[\ce{2HgO(s) ->[\Delta] 2Hg(s) + O(g)}\] |
iv. Electrolytic decomposition |
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which decomposes violently leaving a coloured residue and evolving two neutral gases one of which is unreactive or inert in nature.
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
Define the following type of chemical change or reaction with a suitable example.
Direct combination reaction or synthesis
Give a balanced equation for the following type of reaction:
A synthesis reaction between a metal and a non-metal resulting in the formation of an insoluble salt of iron.
