# Write One Equation Each for Decomposition Reactions Where Energy is Supplied in the Form of Heat, Light Or Electricity - Science

Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.

#### Solution 1

(a) Thermal decomposition reaction (Thermolysis)

Decomposition of potassium chlorate: When heated strongly, potassium chlorate decomposes into potassium chloride and oxygen. This reaction is used for the preparation of oxygen.

2KClO3+Heat2KCl+3O2

(b) Electrolytic decomposition reaction (Electrolysis)

Decomposition of sodium chloride: On passing electricity through molten sodium chloride, it decomposes into sodium and chlorine.

2NaCl"electricity"/>2Na+Cl2

(c) Photodecomposition reaction (Photolysis)

Decomposition of hydrogen peroxide: In the presence of light, hydrogen peroxide decomposes into water and oxygen

2H2O"sunlight"/>2H2O+O2

#### Solution 2

CaCO3(s) "heat"/>CaO(s)+CO2(g)

2AgCl(s) "sunlight"/>2Ag(s)+Cl2(g)

2H2O(l)"electricity"/>2H2(g)+O2(g)

#### Solution 3

(a) Decomposition reaction where energy is supplied in the form of heat:
CaCO3 (s) → CaO (s) + CO2 (g)

(b) Decomposition reaction where energy is supplied in the form of light:
2AgCl (s) → 2Ag (s) + Cl2 (g)

(c) Decomposition reaction where energy is supplied in the form of electricity:
2H2(l) → 2H2 (g) + O2 (g)

Concept: Types of Chemical Change or Chemical Reaction - Decomposition Reactions
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#### APPEARS IN

NCERT Class 10 Science
Chapter 1 Chemical Reactions and Equations
Q 12 | Page 16
Lakhmir Singh Class 10 Chemistry (Science)
Chapter 1 Chemical Reactions and Equations
Q 13 | Page 45