Science
Select from the following a decomposition reaction in which source of energy for decomposition is light:
options
- 2FeSO4 → Fe2O3 + SO2 + SO3
- 2H2O → 2H2 + O2
- 2AgBr → 2Ag + Br2
- CaCO3 → CaO + CO2
Chemical Reaction
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Answer
2AgBr → 2Ag + Br2
Reason —
A decomposition reaction whose energy source is light is called a photochemical decomposition. Silver bromide (AgBr) is well known for this because when AgBr is exposed to light, photons supply the energy needed to break chemical bonds, producing metallic silver and bromine according to
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Related Questions
When 2 mL of sodium hydroxide solution is added to few pieces of granulated zinc in a test tube and then warmed, the reaction that occurs can be written in the form of a balanced chemical equation as :
options
- NaOH + Zn → NaZnO2 + H2O
- 2NaOH + Zn → Na2ZnO2 + H2
- 2NaOH + Zn → NaZnO2 + H2
- 2NaOH + Zn → Na2ZnO2 + H2O
A metal and a non-metal that exists in liquid state at the room temperature are respectively:
options
- Bromine and Mercury
- Mercury and Iodine
- Mercury and Bromine
- Iodine and Mercury
Carbon compounds :
(a) are good conductors of electricity.
(b) are bad conductors of electricity.
(c) have strong forces of attraction between their molecules.
(d) have weak forces of attraction between their molecules.
The correct statements are:
options
- (a) and (b)
- (b) and (c)
- (b) and (d)
- (a) and (c)
Consider the following compounds :
FeSO4; CuSO4; CaSO4; Na2CO3
The compound having maximum number of water of crystallisation in its crystalline form in one molecule is :
options
- FeSO4
- CuSO4
- CaSO4
- Na2CO3