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Crystals of Salts

Heated calciu...

Question

Heated calcium sulphate with half a water of crystallization is commonly called as:

A

washing soda

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B

plaster of Paris

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C

nausadar salt

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D

bleaching powder

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Solution

The correct option is C plaster of Paris
Plaster of Paris is chemically called calcium sulphate hemihydrate. Since, it is brought to use from Paris, called as "Plaster of Paris". It is prepared by heating gypsum at $373 K .$

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Similar questions

Q. Magnesium sulphate crystals are commonly called:

__ is the common name for calcium sulphate with water of crystallization.

Q. The colour of the salt formed due to the removal of water of crystallization from hydrated copper sulphate upon heating is _________.

Q. Copper sulphate crystals which seem to be dry contain water of crystallization. When we heat the crystals, this water is removed and the salt turns white. If you moisten the crystals again with water, you will find that blue colour of the crystals reappears.

The water of crystallization is the fixed number of water molecules present in one formula unit of a salt. Five water molecules are present in one formula unit of copper sulphate. The chemical formula for hydrated copper sulphate is

C u {S O}_{4}

5 H_{2} O

. Now you would be able to answer the question whether the molecule of

{N a}_{2} {C O}_{3}

10 H_{2} O

is wet. One other salt, which possesses water of crystallization is gypsum. It has two water molecules as a water of crystallization. It has the formula

C a {S O}_{4}

2 H_{2} O

What are the uses of this salt?

C a O C l_{2}

is the product of reaction between calcium hydroxide and ___ and is commonly called as ___.

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