Amongst the following, find the total number of compounds whose aqueous solution turns red litmus paper blue.KCN, K2SO4, NH42C2O4, NaCl, ZnNO32, FeCl3,K2CO3,NH4NO3,LiCN
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answer is 3.
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Detailed Solution
Basic salt solution will have pH > 7, will change colour of litmus paper red to blue. KCN, K2CO3, LiCN are the only basic salts among these.