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JAMB Chemistry 1984 Question 35

Question 35

Acids, Bases and Salts

Which of the following statements is NOT correct about all four of the acids: HBr, HNO3, H2CO3 and H2SO4? They

  1. A.dissolve marble to liberate CO2
  2. B.have a pH less than 7
  3. C.turn blue litmus red
  4. D.neutralize alkalis to form salt
  5. E.react with magnesium to liberate hydrogen
Show the answer and explanation

Answer: A (dissolve marble to liberate CO2)

Explanation

Carbonic acid is too weak to release CO2 from marble, and H2SO4 soon stops reacting because insoluble CaSO4 coats the marble. So A is not true of all four.