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BECE Science 2025 Paper

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Question : 35

Total: 40

The chemical formula of iron (II) sulphide is

$FeS_{2}$
$Fe_{2}S$
$FeS$
$Fe_{2}S_{3}$

Solution:

Concept:

Iron(II) sulphide contains

\mathrm{Fe}^{2+}

and

\mathrm{S}^{2-}

ions, which combine in a 1:1 ratio.

Explanation:

Iron(II) means iron has a charge of

+2

, written as

\mathrm{Fe}^{2+}

.

Sulphide ion has a charge of

-2

, written as

\mathrm{S}^{2-}

.

Since the charges are equal and opposite, one

\mathrm{Fe}^{2+}

combines with one

\mathrm{S}^{2-}

.

Thus, the formula is

\mathrm{FeS}

.

Answer:

C.

\mathrm{FeS}

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