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JAMB Chemistry 2013 Paper

Question : 8

Total: 44

Steam changes the colour of anhydrous cobalt (ll) chloride from

Solution:

Concept:

Anhydrous cobalt(II) chloride is blue, while its hydrated form is pink.

Explanation:

Anhydrous

\mathrm{CoCl}_2

is blue in colour.

Steam provides water, causing hydration to form

\mathrm{CoCl}_2 \cdot 6\mathrm{H}_2\mathrm{O}

, which is pink.

So the colour changes from blue to pink.

Answer:

C. blue to pink

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