Question

14. In which of the following, heat energy will be evolved?
(a) Electrolysis of water
(b) Dissolution of NH4Cl in water
(c) Burning of L.P.G.
(d) Decomposition of AgBr in the presence of sunlight​

Answer 1

Answer:

burning of LPG

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Answer 2

Final answer: The correct answer is option (c) Burning of L.P.G.

Given that: We are given,

(a) Electrolysis of water.

(b) Dissolution of $NH_{4}Cl$ in water.

(c) Burning of L.P.G.

(d) Decomposition of $AgBr$ in the presence of sunlight​.

To find: We have to find which of these reactions, heat energy will be evolved.

Explanation:

• The correct answer is option (c) Burning of L.P.G. The chemical reaction involved is hydrocarbon is burnt, and it produces carbon dioxide, heat, and water. Burning of L.P.G is an exothermic reaction and hence produces a lot of heat. Fuels release heat on burning.

• During the electrolysis of water, in the presence of electricity breaks down water molecules into oxygen and hydrogen gas. Electrolysis of water absorbs heat. Hence option (a) Electrolysis of water, is not the correct option.

• Dissolution of $NH_{4}Cl$ in water producing $NH_{4}OH$ and $HCl$ doesn’t produce heat. It is an endothermic process. Hence, option (b) Dissolution of $NH_{4}Cl$ in water, is incorrect.

• In the presence of sunlight, silver bromide decomposes to yield silver metal and bromine gas. It does not evolve heat. Hence, option (d) Decomposition of $AgBr$ in the presence of sunlight, is again the wrong answer.

 

To know more about the concept please go through the links

https://brainly.in/question/28078033

https://brainly.in/question/5630379

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