Advertisements
Advertisements
प्रश्न
Decomposition reactions can occur by heat.
Give two balanced reactions for each.
Advertisements
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
Explain, giving one example of the following chemical change:
Thermal dissociation
State the type of reactions for the following represent and balance the ones that are not balanced.
2HgO → 2Hg + O2
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 nitrate
The reaction can be classified as:
State which of the following type, take place in the reaction is given below.
\[\ce{AgNO3 + HCl->AgCl + HNO3}\]
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 lead carbonate
Give a reason why zinc displaces hydrogen from dilute sulphuric acid but copper does not.
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.
