Post-UTME Chemistry 2012 Objective — Question 11

Question 11 of 11 from the Post-UTME Screening (Post-UTME) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

The scum formed when soap is mixed with hard water could be

A. Calcium hydrogen trioxo Carbonate (IV)
B. Propane 1,2,3 triol
C. calcium hydrogen trioxocarbonate(IV)
D. magnesium tetraoxosulphate (VI)Correct

Explanation

This item's precise intended answer (soap scum is chemically calcium/magnesium salts of fatty acids) was not exactly matched by any listed option; option D is presented as the closest match given the hard-water magnesium ion context, flagged for uncertainty.

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