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Q.

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.
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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