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Science · 2024 · 2 marks
CBSE 2024 · Region 2 · Set 2 · Q21
(a) Define a decomposition reaction. Write an equation to show thermal decomposition of ferrous sulphate crystals.
(a)
Define a decomposition reaction. Write an equation to show thermal decomposition of ferrous sulphate crystals.
OR
(b)
What is meant by a balanced chemical equation ? Why is it necessary for the equation to be balanced ?
Marking-scheme solution
(a)
When a single reactant breaks down to give simpler products.
\[2 \mathrm{FeSO}_{4}(\mathrm{~s}) \xrightarrow{\mathrm{Heat}} \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s})+\mathrm{SO}_{2}(\mathrm{~g})+\mathrm{SO}_{3}(\mathrm{~g})
\]
OR
(b)
Balanced chemical equation is one in which the total number of atoms of each element remains same for reactants and products.
Mass can neither be created nor destroyed in the chemical reaction./ To satisfy law of conservation of mass.
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