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Q.

Give the chemical formula of the following.


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


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a

None of the above 

b

Question Image

c

Question Image

d

Question Image

answer is B.

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Detailed Solution

detailed_solution_thumbnail
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, Question Image.
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 Question Image.
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 formulaQuestion Image .
Hence, the correct answer is option 2.
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