JAMB Chemistry 2013 Objective — Question 13

Question 13 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

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

A. blue to pinkCorrect
B. white to blue
C. white to red
D. blue to white

Explanation

Water (steam or otherwise) turns anhydrous cobalt(II) chloride from blue to pink. Anhydrous CuSO4, by contrast, changes from white to blue when water is added.

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