JAMB Chemistry 2007 Objective — Question 30

Question 30 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2007 Objective paper, with the correct answer and a full explanation.

A solution which on treatment with hydrochloric acid produces a colourless, odourless gas which turns lime water milky is most likely to be a

A. chloride
B. hydroxide
C. trioxonitrate(V)
D. trioxocarbonate (IV)Correct

Explanation

A carbonate reacting with HCl releases CO2 gas, which is colourless, odourless and turns limewater milky, e.g. CaCO3 + 2HCl -> CaCl2 + H2O + CO2.

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