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Chemical Changes and Reactions — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYChemical Changes and Reactions2 Marks
Question
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
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Answer

When hydrogen burns in oxygen, water is formed - Combination Reaction.
When electricity is passed through water, hydrogen and oxygen are given out - Decomposition Reaction.

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