Question

Setting of plaster of paris involves 1). dehydration process 2). hydration to form other hydrates 3). oxidation process 4). reduction process.

Answer 1

Option 2 is correct. When water is added to plaster of paris it becomes hard.

Answer 2

Answer: Option (2) is the correct answer.

Explanation:

Setting of plaster of paris involves the conversion of hemihydrate into dihydrate.

It is known that chemical formula of plaster of paris is $CaSO_{4}.frac{1}{2}H_{2}O$. So, when plaster of paris undergoes the setting then it results in the formation of hydration to form other hydrates.

Hence, we can conclude that out of the given options, setting of plaster of paris involves hydration to form other hydrates.