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JAMB Chemistry 2011 Paper

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Question : 17

Total: 47

How many cations will be produced from a solution of potassium aluminium tetraoxosulphate (VI)?

3
4
1
2

Solution:

Concept:

Potassium aluminium tetraoxosulphate(VI) is a double salt; count the positive ions produced per formula unit.

Explanation:

Its formula is

\mathrm{KAl(SO_4)_2}

.

It dissolves as:

\mathrm{KAl(SO_4)_2 \rightarrow K^+ + Al^{3+} + 2SO_4^{2-}}

The cations produced are

\mathrm{K^+}

and

\mathrm{Al^{3+}}

.

Therefore, it produces 2 cations.

Answer:

2

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