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Which is true statement about \( \boldsymbol{H}_{2} \boldsymbol{O} \) ?

1. Hardness can be removed by passing through ion exchange resin
2. Its pressure can be detected by anhydrous \( C u S O_{4} \)
3. It is amphoprotic
4. All of the above

Correct answer: All of the above

Solution

All three statements are true. Ion-exchange resins remove hardness ions like Ca2+ and Mg2+, anhydrous CuSO4 turns blue in the presence of water, and H2O is amphiprotic because it can both donate and accept a proton.

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