Give the chemical formula of the following.

i)Calcium sulphate ii)Aluminium phosphate iii) Aluminium sulphate

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None of the above

answer is B.

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Detailed Solution

Concept- A chemical formula shows the number of elements present in a molecule.
In calcium sulphate, calcium has a +2 oxidation state and sulphate ion has a -2 oxidation state. One ion from each satisfy the neutral charge present. Thus their formula includes one calcium ion and one sulphate ion,

.
In aluminium phosphate, aluminium has a +3 oxidation number and phosphate ion has a -3 oxidation number. one ion from each satisfies the neutral charge. Thus the formula is

.
In aluminium sulphate, aluminium has +3 oxidation state and sulphate ion has -2 oxidation state to form a neutral molecule two aluminium complexes with three sulphate ions giving the formula

.
Hence, the correct answer is option 2.

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