Waec Chemistry 1997 Past Questions and Answers

Question 31:

• WAEC 1997

The use of diamond in abrasives is due ti its

A. High melting point
B. Durability
C. Lustre
D. Hardness
E. Octahedral shape

Question 32:

• WAEC 1997

Which of the substance lettered P to V in the equation below would be left on the filter paper if the reaction mixture were filtered? P _(aq) + Q_(aq) → V_(s) + R_(aq) + T_(g)

A. P
B. Q
C. V
D. T
E. R

Question 33:

• WAEC 1997

When chlorine is added to slaked lime, the product obtained is

A. Bleaching powder
B. Chlorinated water
C. Hydrochloric acid
D. Oxochlorate (l) acid
E. Trioxochlorate (V) salt

Question 34:

• WAEC 1997

Which of the following when heated strongly in air will leave a metal as residue?

A. Sodium trioxonitrate (V)
B. Potassium trioxonitrate (V)
C. Silver trioxonitrate (V)
D. Lead (ll) trrioxonitrate(V)
E. Aluminium trioxonitrate (V)

Question 35:

• WAEC 1997

Which of the following is used as water softener?

A. Na₂CO₃.10H₂O
B. CuSO₄. 5H₂O
C. MgSO₄. 7H₂O
D. CaCI₂.2H₂O
E. Na₂SO₄. 10H₂O