Which one of the following reactions is different from the remaining three?
- NaCl + AgNO3 → AgCl + NaNO3
- CaO + H2O → Ca(OH)2
- KNO3 + H2SO4 → KHSO4 + HNO3
- ZnCl2 + H2S → ZnS + 2HCl
The Correct Option is B
Solution and Explanation
1: This is a double displacement reaction (precipitation reaction) where sodium chloride reacts with silver nitrate to form silver chloride and sodium nitrate.
2: This is a combination reaction where calcium oxide reacts with water to form calcium hydroxide. This is different from the other reactions, which involve displacement or exchange of ions.
3: This is an acid-base reaction where nitric acid (\(HNO_3\)) reacts with sulfuric acid (\(H_2SO_4\)) to form potassium bisulfate and nitric acid.
4: This is a double displacement reaction where zinc chloride reacts with hydrogen sulfide to form zinc sulfide and hydrochloric acid.
The Different Reaction: Option (B) is a combination reaction, whereas the others are displacement or exchange reactions.
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