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Sort out the Lewis acids and Lewis base...

Sort out the Lewis acids and Lewis bases among the following:
` Cl^(-) , BCl_3, SO_2 , OH^(-) , Fe^(3+) , SnCl_4,Ni , CH_3OH, NH_3?`

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Lewis acids: `BCl_(3), SO_(2), Fe^(3+), SnCl_(4), Ni` Lewis base: `Cl^(-), OH^(-), CH_(3)OH, NH_(3)`
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