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Chemistry CBSE Live product
Class 10 (2025-26)
Chemical reaction and equations
Annual Revision I - Chemical reactions and equations
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 when heated
two or more simple substances combine to form a single compound
single compound breaks down into two or more simpler substances by absorption of light
is known as
thermal decomposition
reaction.
Examples:
\(2H_2O → 2H_2 + O_2\)
\(2Na + Cl_2 → NaCl\)
\(Zn + CuSO_4 → ZnSO_4 + Cu\)
\(CaCO_3 → CaO + CO_2\)
and
\(N_2 + 3H_2 → 2NH_3\)
\(Na_2SO_4 + BaCl_2 → BaSO_4 + 2NaCl\)
\(Fe(SO_4) → Fe_2O_3 + SO_2 + SO_3\)
\(HCl + NaOH → NaCl + H_2O\)
.
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