Question

Which of the following are decomposition reactions?
1. CH4 (g) + O2 (g) → CO2 (g) + H2O (l)
2. CaO (s) + CO2 (g) → CaCO3 (s)
3. Mg (s) + O2 (g) → MgO (s)
4. PbCO3 (s) → PbO (s) + CO2 (g)

Answer 1

Answer:

4 th one

because one compound decompose to form two or more compound

Answer 2

Decomposition reactions is

$PbCO_{3} (s) -> PbO (s) + CO_{2} (g)$

Option 4

Explanation:

• Decomposition is a type of reaction where is a reactant in any of the physical state breaks down to form two or more substances which may be of the same or different physical state, the reactant is lead carbonate.
• it has been decomposed to form lead oxide and carbon dioxide.
• The most of the decomposition reaction takes place in the presence of the heap and it is known as thermal decomposition reaction.

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