Acids and Bases Revision MCQ Questions

1.    Four particles are present in dilute sulfuric acid.

Which particle is present in the lowest concentration?

A    The hydroxide ion. OH (aq)

B    The hydrogen ions, H+(aq)

C    The sulfate ion. SO42-(aq)

D    The water molecule. H2O(l)

2.    The following statements about dilute sulfuric acid are all correct.

  1. A white precipitate is formed when aqueous barium chloride is added.
  2. The solution turns anhydrous copper (II) sulfate from white to blue.
  3. Addition of Universal indicator shows that the solution has a pH value of lesser than 7.0
  4. The solution reacts with copper (II) oxide, forming a blue solution.

Which two statements confirm the acidic nature of the solution?

A      1 and 2

B      1 and 3

C      2 and 4

D      3 and 4

3.    2 drops of methyl orange are added to 15 cm3 of dilute nitric acid in a conical flask. 10 cm3 of aqueous potassium hydroxide are then added gradually to the flask. Which changes occurs in the mixture in the conical flask?

A    Methyl orange changes colour from orange to red.

B    The concentration of the H+ ion decreases.

C    The pH value is lowered.

D    White precipitate is formed.

4.    X, Y and Z are elements in the same period of the Periodic Table. X forms an acidic oxide, Y forms a basic oxide and Z forms an amphoteric oxide. If X, Y and Z are placed in order of increasing atomic number, which order is correct?

A    X, Y, Z

B    X, Z, Y

C    Y, X, Z

D    Y, Z, X

5.    Which observation is true when an alkaline solution of potassium nitrate is warmed with aluminium powder?

A    Colourless and odourless gas is evolved. Gas relights glowing splinter.

B    Colourless and pungent gas is evolved. Gas turns moist red litmus paper blue.

C    Colourless and odourless gas is evolved. Lighted splinter extinguishes with ‘pop’ sound.
D    Colourless and pungent gas is evolved. Gas turns acidified potassium dichromate (VI) from orange to green.


1.    A

2.    D

3.    B

4.    D

5.    B