JAMB Chemistry 2010 Objective — Question 13

Question 13 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

13. Permanent hardness of water can be removed by A. adding caustic soda B. boiling C. filtration D. adding slaked lime

A. adding caustic sodaCorrect
B. boiling
C. filtration
D. adding slaked lime

Explanation

Permanent hardness of water (caused by calcium/magnesium sulphates and chlorides) can be removed by adding washing soda; boiling only removes temporary hardness.

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