Classify these salts as acidic, basic, or neutral. KCL, NH4Br, K2CO3, NaCN, LiClO4?

Classify these salts as acidic, basic, or neutral. KCL, NH4Br, K2CO3, NaCN, LiClO4? This is what I put but got it wrong: KCl = basic NH4Br = acidic K2CO3 = basic NaCN = basic LiClO = Neutral Can someone me what I did wrong, thanks.