Waec Chemistry 2011 Past Questions and Answers

Question 16:

• WAEC 2011

In metallic colids, the forces of attraction are between the mobile valence electrons and

A. Atoms
B. Neutrons
C. The negative ions
D. Positively charged nuclei

Question 17:

• WAEC 2011

Which of the following statements about displacement reaction is correct?

A. A more electropositive element displaces a less electroposive one
B. A less electropositive element displaces a more electropositive one
C. The position of elements in the reactivity series has no effect on the reaction
D. It only occurs when the reaction is at equilibrium

Question 18:

• WAEC 2011

The volume occupied by 17g of H₂S at s.t.p. is [H = 1.00, S = 32.0, Molar volume = 22.4 dm³]

A. 11.2dm ³
B. 17.0 dm³
C. 34.0dm ³
D. 44.8dm ³

Question 19:

• WAEC 2011

Consider the reaction represented by the following equation: xKMnO _4(aq) + ySO_2(g) + zH₂O_(I) → K ₂SO_4(AQ) + 2MnSO_4(aq) + 2H₂SO x,y and z are respectively

A. 2,5 and 2
B. 2,2 and 5
C. 5, 1 and 2
D. 1, 5 and 2

Question 20:

• WAEC 2011

What is the amount of magnesium that would contain 1.20 x 10²⁴ particles? [Mg = 24, Avogadro's constant = 6.02 x 10²³]

A. 0.5 moles
B. 2.0 moles
C. 12.0 moles
D. 24.0 moles