Take about $2$ g barium hydroxide in a test tube. Add $1$ g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?

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Solution

Bottom of test tube will feel cold. During the reaction, heat is absorbed. The reaction is endothermic.
$B a (O H)_{2} + 2 N H_{4} C l + heat \to B a C l_{2} + 2 N H_{3} + 2 H_{2} O$

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Take about 2g barium hydroxide in a test tube. Add 1 g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?

Bottom of test tube will feel cold. During the reaction, heat is absorbed. The reaction is endothermic.Ba(OH)2+2NH4Cl+ heat →BaCl2+2NH3+2H2O

Take about $2$ g barium hydroxide in a test tube. Add $1$ g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?

Bottom of test tube will feel cold. During the reaction, heat is absorbed. The reaction is endothermic.
$B a (O H)_{2} + 2 N H_{4} C l + heat \to B a C l_{2} + 2 N H_{3} + 2 H_{2} O$