Question

in all of the following reaction, heat is given out along with the formation of single product , except (a) formation of water. (b) burning of coal. (c) respiration. (d) slaking of lime​

Answer 1

Answer:

burning of coal.

Explanation:

burning of coal

Answer 2

In all of the following reaction, heat is given out along with the formation of single product , except formation of water.

Therefore, option (a) is correct.

Explanation:

The reaction of formation of water is

$2H_2+O_2\rightarrow 2H_2O$

This is a combination reaction and not an exothermic reaction, hence heat is not given out

Burning of coal

$C+O_2\rightarrow CO_2$

It is an exothermic reaction, in this reaction heat is given out

Respiration

$C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O$

This is also an exothermic reaction in which heat is given out

Slaking of lime

$CaO+H_2O\rightarrow Ca(OH)_2$

This reaction is also an exothermic reaction therefore, in this reaction heat is given out.

Hope this answer is helpful.

Know More:

Q: Which of the following reactions is an endothermic reaction?

i) Burning of coal.

ii) Decomposition of vegetable matter into compost.

iii) Process of respiration.

iv) Decomposition of calcium carbonate to form quick lime and carbon dioxide

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