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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In the chemical name copper (II) sulphate the roman numeral is used to show
A
Which ion is used
B
How the ion is used
C
the period the element belonged in
D
the group the element belonged in
Explanation: 

Detailed explanation-1: -A metal sulfate compound having copper(2+) as the metal ion. This entity has been manually annotated by the ChEBI Team. Copper(II) sulfate, also known as copper sulphate, is an inorganic compound with the chemical formula CuSO4.

Detailed explanation-2: -Copper Sulfate is written with the (II) due to its oxidation state. All transition metals will have roman numerals to represent their state of oxidation while alkali metals do not.

Detailed explanation-3: -The CuSO4 molecule consists of an ionic bond between the copper cation (Cu2+) and the sulfate anion (SO42-). An illustration describing the structure of a copper sulfate molecule is provided below.

Detailed explanation-4: -Therefore, there is one copper (II) cation present and one sulfate anion present.

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