JEE Advance - Chemistry (2010 - Paper 1 Offline - No. 5)

Amongst the following the total number of compounds whose aqueous solution turns red litmus paper blue is
KCN, K2SO4, (NH4)2C2O4, NaCl, Zn(NO3)2, FeCl3, K2CO3, NH4NO3 and LiCN
Answer
3

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