Problem: Of the following list of molecules and ions, which can behave as Lewis bases: CO3-2, NH4+, Na+, OH-?  (i) NH4+ only (ii) NH4+ and OH- (iii) CO3-2 and Na+ (iv) CO3-2 and OH- (v) OH- only

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Lewis bases are electron donors which usually have lone pair of electron or a negative charge 

(i) NH4+ only (Incorrect, no lone pairs or negative charge)

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Problem Details

Of the following list of molecules and ions, which can behave as Lewis bases: CO3-2, NH4+, Na+, OH-?  

(i) NH4+ only 

(ii) NH4+ and OH- 

(iii) CO3-2 and Na+ 

(iv) CO3-2 and OH- 

(v) OH- only

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