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In the chemical equation CuSO$_4$(aq) + Zn(s) $\longrightarrow$ ZnSO$_4$(aq) + Cu(s), which substances are the reactants?
AZnSO$_4$ and Cu
BCuSO$_4$ and Cu
CZnSO$_4$ and Zn
DCuSO$_4$ and Zn
Answer & Solution
Correct answer: D. CuSO$_4$ and Zn
1. Reactants are the substances written on the left side of the arrow.
2. The arrow points towards the products, indicating the direction of the reaction.
3. Here the left side has CuSO$_4$(aq) and Zn(s), so these are the reactants.
4. ZnSO$_4$ and Cu, written on the right side, are the products.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.41_
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