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प्रश्न
Decomposition reactions can occur by heat.
Give two balanced reactions for each.
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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.
\[\ce{\underset{\text{(Lime stone)}}{CaCO3(s))} ->[\Delta] \underset{\text{(Quick lime)}}{CaO(s)} + CO2(g)}\]
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संबंधित प्रश्न
Explain the types of reaction with reference to oxygen and hydrogen. Illustratre with examples.
State the type of reactions for the following represent and balance the ones that are not balanced.
NH4Cl → NH3 + HCl
State the type of reactions for the following represent and balance the ones that are not balanced.
AgNO3 + NaCl → AgCl + NaNO3
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 |
Decomposition reactions can occur by electricity
Give balanced reactions.
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.
Displacement reaction or substitution reaction
Define the term – double decomposition – neutralization reaction.
Complete the statement by filling in the blank with the correct word:
Formation of hydrogen chloride from hydrogen and chlorine is an example of __________.
Complete the statement by filling in the blank with the correct word:
The neutral gas evolved when lead nitrate undergoes thermal decomposition is _________.
