 4 ) , which features both Sb ( III ) and Sb ( V ) . Unlike oxides of phosphorus and arsenic , these various oxides are amphoteric , do not form well @-@ defined oxoacids and react with acids to form antimony salts . 
 4 ) , which <a href='uninflect' title='1'><mark>features</mark></a> both Sb ( III ) and Sb ( V ) . Unlike oxides of phosphorus and arsenic , these various oxides <a href='drop_aux' title='2'><mark>are</mark></a>amphoteric , do not form well @-@ defined oxoacids and react with acids to form antimony salts . 
4 ) , which feature both Sb ( III ) and Sb ( V ) . Unlike oxides of phosphorus and arsenic , these various oxides amphoteric , do not form well @-@ defined oxoacids and react wid acids to form antimony salts .