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प्रश्न
Decomposition reactions can occur by sunlight.
Give two balanced reactions.
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उत्तर
Sunlight
Decomposition of silver chloride or silver bromide when exposed to sunlight. Silver chloride decomposes to give silver and chlorine whereas silver bromide gives silver and bromine. These reactions are used in black and white photography.
\[\ce{2AgCI(s) ->[Sunlight] 2Ag(s) + CI2(g)}\]
\[\ce{2AgBr(s) ->[Sunlight] 2Ag(s) + Br2(g)}\]
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संबंधित प्रश्न
Explain, giving one example for each of the following chemical changes:
Displacement
What is a decomposition reaction?
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.
Zinc carbonate
State which of the substance given below evolve oxygen gas on thermal decomposition.
Anhydrous copper sulphate
Define the following type of chemical change or reaction with a suitable example.
Decomposition reaction
Give a balanced equation for a direct combination reaction involving:
Two elements – one of which is a neutral gas and the other a yellow non-metal
Give a balanced equation for the following reaction of synthesis involving the formation of:
An acid – from sulphur dioxide gas
Give a balanced equation for thermal decomposition of calcium hydroxide
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.
