Question

When Cao is added to water taken in beaker rise in temperature and when Ba(OH)2 is mixed qith NH4Cl a fall in temperature. Why

Answer 1

because when cao added in water it form CA (OH)2 which is exothermic reaction means it produces heat. and when we react to barium Hydroxide to nh4cl then it will be endothermic reaction absorbs heat.
so there will be fall in temperature .
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Answer 2

Hey mate....

It might help you

The reaction between water and CaO is an exothermic reaction. Heat is released during exothermic reaction ,rise in temperature is observed The reaction between Ba(OH)2 & NH4Cl is an endothermic reaction. Heat is absorbed during endothermic reaction, fall in temperature is observed.

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Plz mark it as brainlist plz