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Water is decomposed into hydrogen and oxygen by passing electric current through acidulated water: 2H$_2$O(l) $\longrightarrow$ 2H$_2\uparrow$ + O$_2\uparrow$. This type of decomposition is called:
Aneutralisation
Brancidity
Crusting
Delectrolysis
Answer & Solution
Correct answer: D. electrolysis
1. Here the decomposition is driven by electrical energy passing through the water.
2. Decomposition brought about by electrical energy is named electrolysis.
3. Neutralisation is an acid-base reaction, not a decomposition.
4. Rusting and rancidity are slow oxidation processes, unrelated to electric decomposition, so they are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.46_
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