Which of the following changes are not reversible Select one: a. Dehydration b. Melting c. Decomposition d. Hydration

d. Decomposition

Explanation:

Reversible changes -

As the name suggests the the changes which can be reversed back to the original compound , is referred to as reversible changes .

All the physical changes are reversible in nature .

For example ,

Melting of ice , as the ice is melted from solid to liquid form , the liquid can again be converted back to solid , by reducing the temperature .

The process of hydration and dehydration are exactly opposite to each other , As hydration refers to the addition of water on to the system , where as dehydration refers to the process of removing water from the system ,

Hence , the changes are reversible in nature .

Decomposition is the process of break down of the chemical species into two or more species .

The species can not be further merged back to get back the original compound , hence is not a reversible change .

D)can be increased in a closed system

Yeah, but what are you trying to ask?