JAMB Chemistry 2014 Objective — Question 20

Question 20 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2014 Objective paper, with the correct answer and a full explanation.

Which of the following salts will turn litmus red?

A. Zinc chloride
B. Sodium tetrahydroxozincate (II)
C. Potassium hydrogen tetraoxosulphate (VI)Correct
D. Sodium hydrogen tetraoxosulphate (IV)

Explanation

A solution of potassium hydrogen tetraoxosulphate (vi) will turn blue litmus paper red. If one is to consider the origin of the salt, it is from a strong acid (H2SO4) and a strong base (KOH). This would have made it a neutral salt. However, the presence of excess H+ makes it acidic.

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