1989 - WAEC Chemistry Past Questions and Answers - page 4
31
50cm 3 of a saturated solution of potassium trioxonitrate (V)at 40°C contains 5.05g of the salt. What is the solubility of potassium trioxonitrate (V) at 40°C? (KNO3 = 101)
A
1.0 mol dm-3
B
1.5 mol dm-3
C
2.0 mol dm-3
D
2.5mol dm-3
correct option: a
Users' Answers & Comments32
The oxidation number of chlorine is + 1 in
A
KCIO 3
B
CI 2O 7
C
ZnCI2
D
HCI
correct option: e
Users' Answers & Comments33
What is the voltage of the cell represented at Zn(s) Zn 2+(aq) /Cu2+(aq) /Cu(s) given that for Cu 2+(aq)/ Cu (s) Eo = 0.337V and for Zn2+(aq) /Zn(s)' E o = -0.763V?
A
+0.426V
B
-0.426V
C
-0.337V
D
-1.10V
correct option: e
Users' Answers & Comments