Question

a. Which of the following reactions is ane an endothermic reaction(s) where
decomposition also happens?
Respiration
Heating of lead nitrate
Decomposition of organic matter
Electrolysis of acidified water
b. Silver chloride when kept in the open turns grey. Illustrate this with a
balanced chemical equation​

Answer 1

Which of the following reactions is ane an endothermic reaction(s) where decomposition also happens?

Respiration

Heating of lead nitrate

Decomposition of organic matter

Electrolysis of acidified water

The correct answer is :

Electrolysis of acidified water

Explanation :

Heating of lead nitrate and electrolysis of acidic water are two such reactions, which are endothermic reactions and where decomposition also takes place.

Decomposition is a process in which any element is broken down into different microscopic parts. Decomposition is a natural process occurring in all-natural organisms and all chemical substances.

b. Silver chloride when kept in the open turns grey. Illustrate this with a balanced chemical equation​

The chemical equation is :

AgCl(s)  ——(Sunlight)—— 2Ag(s) + Cl2

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Answer 2

An endothermic reaction(s) where decomposition also happens is the electrolysis of acidified water.

Electrolysis:

During this process, a voltameter is filled with acidulated water, and two iron or graphite electrodes are kept inside connected with a closed circuit.

As the electricity is passed through the water, H₂(Hydrogen) and O₂(Oxygen) gases are separated which come out to fill inside the test tubes inverted into the electrodes as,

                             2H₂O       ⇄                 2H₂   +   O₂

The reaction is reversible and endothermic since heat is given to the water such as the water-absorbing heat to decompose the water into hydrogen and oxygen gases.

Thus, it is also the decomposition reaction.

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