Consider the following statements: (1) The formation of dew is a physical change. (2) The explosion of bombs is an endothermic process. (3) Dissolution of common salt can be reversed by heating. Which of the above statements is/are correct?

Answer: C. Both 1 and 3

The formation of dew is a physical change because water vapour condenses into liquid without forming a new substance. An explosion releases heat and energy, so it is an exothermic process, making statement 2 incorrect. Salt dissolved in water can be recovered by evaporating the water through heating, so statement 3 is correct. Therefore, statements 1 and 3 are correct.

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