Waec Chemistry 2002 Past Questions and Answers

Question 26:

• WAEC 2002

A major factor considered in selecting a suitable method for preparing a simple salt is its

A. Crystalline form
B. Melting point
C. Reactivity with dilute acids
D. Solubility in water

Question 27:

• WAEC 2002

Which of following acids forms normal salts only?

A. Tetraoxosulphate (VI) acid
B. Trioxosulphate (IV) acid
C. Trioxosulphate (IV) acid
D. Tetraoxophosphate (V) acid

Question 28:

• WAEC 2002

A substance is said to be hygroscopic if it absorbs

A. Water from the atmosphere to form a solution
B. Heat from the surrounding
C. Carbon (IV) oxide from the atmosphere
D. Moisture from the atmosphere without dissolving

Question 29:

• WAEC 2002

Calculate the mass of sodium hydroxide in 5.00 dm³ of a 0.125 mol dm^-3 solution. [NaOH = 40 g mol^-1]

A. 0.0156 g
B. 0.625 g
C. 1.00 g
D. 25.0 g

Question 30:

• WAEC 2002

Which of the following salt solutions will have a pH greater than 7?

A. NaCI_(aq)
B. Na₂CO_3(aq)
C. Na₂SO_4(aq)
D. NaHSO_4(aq)