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How many of the following are Lewis aci...

How many of the following are Lewis acids ? `[C Cl_4 , Si F_4 , BF_4^(-) , NH_4^(+) , overset(* * )(C Cl_2 ) , Mg^(+2) , O, HCHO]`

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The correct Answer is:
5
` "SiF"_4 , overset(* *) C Cl_2 , Mg^(+2) , O , HCHO ` are lewis acids.
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