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Coordination Complexes

Magnesium sul...

Question

Magnesium sulphate crystals are commonly called:

A

gypsum salt

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B

epsom salt

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C

green vitriol

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D

alum

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Solution

The correct option is D epsom salt
Magnesium sulphate crystals usually exist as heptahydrate sulphate mineral epsomite, having the chemical formula $M g S O_{4} .7 H_{2} O$ . It is commonly called Epsom salt.

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

Q. Copper sulphate pentahydrate is commonly called _______, whereas ferrous sulphate heptahydrate is commonly called ________ .

Q. Sodium sulphate is also called ___ salt.

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?

On the basis of the reactivity series of metals, predict how these metals will react with each of the following salt solutions:

Metals: magnesium, zinc, copper, iron, and potassium

Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, iron sulphate,and potassium sulphate

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