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Arnav dissolves small amount of A' to a ...

Arnav dissolves small amount of A' to a beaker containing water and observes that the solution temperature increases.
ii. What do you think substance A' is : `NaOH` or `KNO_3`? Explain.

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When NaOH is dissolved in water, there is evolution of heat (i.e., exothennic process). When `KNO_3` is dissolved in water. there is absorption of heat (i.e., endothermic process). Hence, substance ·A' is NaOH and not `KNO_3. `
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