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From the following list of compounds, how many will produce a solution that turns red litmus paper blue (i.e., gives a basic aqueous solution)? KCN, K2SO4, (NH4)2C2O4, NaCl, Zn(NO3)2, FeCl3, K2CO3, NH4NO3, LiCN

1. 1
2. 2
3. 3
4. 4

Correct answer: 3

Solution

KCN (strong base + weak acid HCN -> basic), K2CO3 (strong base + weak acid H2CO3 -> basic), LiCN (strong base + weak acid HCN -> basic) are the three basic salts. The rest are acidic, neutral, or amphoteric.

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