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Amongst the following, the total number ...

Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is:
`{:(KCN,K_(2)SO_(4),(NH_(4))_(2)C_(2)O_(4),NaCI),(ZN(NO_(3))_(2),FeCI_(3),K_(2)CO_(3),NH_(4)NO_(3)),(LiCN,,,):}`

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The correct Answer is:
3
Those salts which hydrolyse to give alkaline solution will turn red litmus paper blue. Solutions of KCN, `K_2 CO_3 ,LiCN` are basic in nature and their aqueous solution turns red litmus paper blue.
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Amonst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is: {:(KCN,K_(2)SO_(4),(NH_(4))_(2)C_(2)O_(4),NaCI),(Zn(NO_(3))_(2),FeCI_(3),K_(2)CO_(3),NH_(4)NO_(3)),(LiCN, , ,):}

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