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Q.

Give the chemical formula of Calcium sulphate. 

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a

CaSO4

b

CaCl2

c

CaCO3

d

CaSO

answer is B.

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Detailed Solution

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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 satisfies the neutral charge present. Thus, their formula includes one calcium ion and one sulphate ion, CaSO4.

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