Question:
Identify the pair containing only Lewis acids.
Identify the pair containing only Lewis acids.
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Lewis acids accept electron pairs, while Lewis bases donate electron pairs.
Updated On: May 7, 2026
- \(BF_3,\ NH_3\)
- \(H^+,\ BF_3\)
- \(F^-,\ H_2O\)
- \(NH_4^+,\ NH_3\)
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The Correct Option is B
Solution and Explanation
Step 1: A Lewis acid is a species that can accept an electron pair. \[ \text{Lewis acid}=\text{electron pair acceptor} \]
Step 2: \(BF_3\) is a Lewis acid because boron has an incomplete octet and can accept an electron pair.
Step 3: \(H^+\) is also a Lewis acid because it can accept an electron pair from a Lewis base. \[ H^+ + :NH_3 \rightarrow NH_4^+ \]
Step 4: Now check the other species: \[ NH_3 \] has a lone pair on nitrogen, so it acts as a Lewis base, not a Lewis acid. \[ F^- \] also has lone pairs and acts as a Lewis base. \[ H_2O \] can donate lone pairs from oxygen, so it is generally a Lewis base.
Step 5: Therefore, the pair containing only Lewis acids is: \[ H^+,\ BF_3 \] \[ \boxed{H^+,\ BF_3} \]
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