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Which of the following statements about water is/are true? (A) Its hardness can be removed by passing through an ion-exchange resin. (B) Its presence can be detected by anhydrous CuSO4. (C) It has maximum density at 4 deg C.

1. Hardness can be removed by passing through ion-exchange resin.
2. Its presence can be detected by anhydrous CuSO4
3. It has maximum density at 4 deg C
4. All of these

Correct answer: All of these

Solution

All three properties are well-established: ion-exchange resins are used for water softening; white anhydrous CuSO4 turns blue (CuSO4·5H2O) in the presence of water making it a qualitative test; and water has its maximum density of 1 g/cm³ at exactly 4 deg C because of the open hydrogen-bonded structure below this temperature.

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