Chemical Changes and Reactions — CHEMISTRY STD 9 — Question
ICSE BoardEnglish MediumSTD 9CHEMISTRYChemical Changes and Reactions2 Marks
Question
Decomposition reactions can occur by electricity Give balanced reactions.
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Answer
Electricity Electrolysis of water i.e. the decomposition of water into hydrogen and oxygen gas when an electric current is passed through water. $2 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{H}_2+\mathrm{O}_2$ Sunlight: $6 \mathrm{CO}_2+12 \mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+6 \mathrm{H}_2 \mathrm{O}+6 \mathrm{O}_2$
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