Question

Why test tube becomes cold when KNO3 is dissolved in water?​

Answer 1

Explanation:

When ammonium chloride is dissolved in water, the test tube becomes cold. Explanation: When ammonium chloride is dissolved in water, the test tube becomes cold because it is an endothermic reaction. ... In the given case, ammonium chloride absorbs heat from the solvent which is the water, thereby making the water cold.

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Answer 2

Answer:

Because reaction is endothermic reaction .

Explanation:

when the potassium nitrate dissolve in test tube containing water then test tube becomes cold because -

•it is endothermic reaction that it absorbs energy from the surrounding in the form of heat .

•Hydrating KNO3 is an endothermic reaction so test tube becomes cold.

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