Advertisements
Advertisements
प्रश्न
Decomposition reactions can occur by heat.
Give two balanced reactions for each.
उत्तर
Heat:
In these types of reactions, a single reactant breaks down to give simpler products.
For example, when ferrous sulfate crystals are heated, they lose water and the colour of the crystals changes. This is because ferrous sulfate decomposes to ferric oxide, sulfur dioxide and sulfur trioxide.
\[\ce{\underset{\text{(Ferrous sulphate)}}{2FeSO4(s)} ->[\Delta] \underset{\text{Ferric oxide}}{Fe2O3(s)} + SO2(g) + SO3(g)}\]
Thermal decomposition of calcium carbonate to produce calcium oxide and Carbon dioxide is very important in many industries. The product calcium oxide, which is also called lime or quicklime, is used to manufacture cement.
\[\ce{\underset{\text{(Lime stone)}}{CaCO3(s))} ->[\Delta] \underset{\text{(Quick lime)}}{CaO(s)} + CO2(g)}\]
APPEARS IN
संबंधित प्रश्न
State the type of reactions for the following represent and balance the ones that are not balanced.
CuO+H2→ Cu+ H2O
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 |
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.
Anhydrous copper sulphate
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 thermal decomposition of ammonium dichromate
Explain the term double decomposition precipitation reaction.
Give a balanced equation for the following type of reaction:
A thermal decomposition reaction of a salt – which results in the formation of nitrogen gas.
Give a balanced equation for the following type of reaction:
A decomposition reaction of a salt which leaves behind a silvery metal.
Differentiate between the following:
Synthesis reaction and a substitution reaction.
