Acids, bases and salts - Jamb Chemistry Past Questions and Answers

Question 91:

• JAMB 1998

The pH of a solution obtained by mixing 100cm³ of a 0.2M solution of NaOH is?

A. 1.3
B. 7.0
C. 9.7
D. 12.7

Question 92:

• JAMB 1998

The metal that will react with water only in the form of steam to librate hydrogen gas is?

A. Calcium
B. Aluminium
C. Iron
D. Zinc

Question 93:

• JAMB 1999

Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen containing compounds because the former contains

A. Water vapour
B. Oxygen
C. Carbon (IV) oxide
D. Rare gases

Question 94:

• JAMB 1999

What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together?

A. A white precipitate is formed
B. A green precipitate is formed
C. The mixture remains colourless
D. The mixture turns reddish brown

Question 95:

• JAMB 1999

The solution with the lowest pH value is

A. 5 ml of (m/10) HCL
B. 10 ml of (m/10) HCL
C. 15 ml of (m/5) HCL
D. 20 ml of (m/8) HCL