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CBSE Class 10 Science 2018 Solved Paper

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Question : 6 of 27
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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.
ZnCO3Zinc carbonate→HeatZnOZinc oxide+CO2Carbon dioxideμ\underset{\text{Zinc carbonate}}{\mathrm{ZnCO}_3} \xrightarrow{\text{Heat}} \underset{\text{Zinc oxide}}{\mathrm{ZnO}} + \underset{\text{Carbon dioxide}\mu}{\mathrm{CO}_2}
Decomposition of water in presence of electricity :
2H2O→Electricity2H2+O2(g)2 \mathrm{H}_2\mathrm{O} \xrightarrow{\text{Electricity}} 2 \mathrm{H}_2 + \mathrm{O}_2 (\mathrm{g})
Decomposition of silver chloride in presence of light:
2AgClWhite→Sunlight2AgGrey+Cl2\underset{\text{White}}{2\mathrm{AgCl}} \xrightarrow{\text{Sunlight}} \underset{\text{Grey}}{2\mathrm{Ag}} + \mathrm{Cl}_2
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