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When CaO is added to water taken in a beaker, rise in temperature is

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+1 vote
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asked Jan 10, 2018 in Chemistry by jisu zahaan (28,760 points) ● 26 ● 374 ● 812
edited Jan 24, 2018 by Vikash Kumar

When CaO is added to water taken in a beaker, a rise in temperature is observed. However, when Ba(OH)2 is mixed with NH4CI, a fall in temperature is observed. Why?

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+1 vote
answered Jan 10, 2018 by faiz (82,347 points) ● 6 ● 6 ● 11
selected Jan 24, 2018 by Vikash Kumar
 
Best answer

Reaction of CaO and water is an exothermic reaction. So, the rise in temperature is observed.

Reaction of Ba(OH)2 and NH4CI is an endothermic reaction and hence fall in temperature is observed.

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