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Chemistry CBSE Live product
Class 10 (2026-27)
Chemical reactions and equations
Annual Revision I
5.
Categories of chemical reactions
Question:
3
m.
Answer the following question:
Define thermal decompostion reaction and provide two examples.
A reaction in which
one element replaces another element in a compound
single compound breaks down into two or more simpler substances by absorption of light
single compound breaks down into two or more simpler substances when heated
two or more simple substances combine to form a single compound
is known as
thermal decomposition
reaction.
Examples:
\(2H_2O → 2H_2 + O_2\)
\(2Na + Cl_2 → NaCl\)
\(CaCO_3 → CaO + CO_2\)
\(Zn + CuSO_4 → ZnSO_4 + Cu\)
and
\(N_2 + 3H_2 → 2NH_3\)
\(Na_2SO_4 + BaCl_2 → BaSO_4 + 2NaCl\)
\(HCl + NaOH → NaCl + H_2O\)
\(Fe(SO_4) → Fe_2O_3 + SO_2 + SO_3\)
.
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