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In the reaction 2Ag$_2$O $\longrightarrow$ 4Ag + O$_2\uparrow$, the silver in Ag$_2$O is:
Areduced, as it gains electrons from oxygen
Boxidised, as it loses hydrogen
Coxidised, as it gains oxygen
Dreduced, as it loses oxygen
Answer & Solution
Correct answer: D. reduced, as it loses oxygen
1. Silver oxide Ag$_2$O breaks down, and the oxygen leaves as O$_2$ gas.
2. The silver loses its oxygen to become free Ag metal.
3. Loss of oxygen is reduction, so the silver is reduced in this decomposition.
4. The 'oxidised' options are the opposite, the hydrogen option is wrong since no hydrogen is present, and the electron-gain wording does not fit this oxygen-loss case.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.55_
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