Question

Which of the following is not an endothermic reaction:
(a) Thermal decomposition of CaCO3
(b) Reactions involved in black and white photography
(c) Electrolysis of water
(d) burning of coal​

Answer 1

Answer:

a) Thermal decomposition of CaCO3

Answer 2

$\large \underline{ \pmb {\orange{{ \frak{ Answer : - }}}}}$

• d) burning of coal

$\large \underline{ \pmb {\orange{{ \frak{ Explanation: - }}}}}$

• Burning of coal is combustion reaction which involves evolution of heat.
• Any reaction which involves evolution of heat is said to be an exothermic reaction. Hence, this is not an endothermic reaction.
• other reactions stated above are endothermic.
• Decomposition reaction is Always endothermic.

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hope its understandable :'D