CBSE Class 10 Science 2018 Solved Paper

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Question : 6
Total: 27
Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity.
Solution:  
Decomposition of zinc carbonate when heat is applied.
ZnCO3
Zinc carbonate
Heat
ZnO
Zinc oxide
+
CO2
Carbon dioxideµ

Decomposition of water in presence of electricity :
2H2O
Electricity
2
H2
+O2(g)

Decomposition of silver chloride in presence of light:
2AgCl
White
Sunlight
2Ag
Grey
+Cl2
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