2005 - JAMB Chemistry Past Questions and Answers - page 1
1
A
passed over heated copper (II) oxide
B
bubbled through water
C
bubbled through concentrated tetroxosulphate (VI) acid
D
bubbled through sodium hydroxide
correct option: d
Users' Answers & Comments2
Which of the following equimolar solutions will have the highest pH?
A
CH3COOHa
B
NaOH
C
HCl
D
NH4OH
correct option: b
Users' Answers & Comments3
Which of the following ions require the largest quantity of electricity for discharge at an electrode?
A
4.0 moles of Cl-
B
3.0 moles of Na+
C
2.5 moles of Cu2+
D
2.0 moles of Al3+
correct option: c
Users' Answers & Comments4
Phenolphthalein in acidic solution is
A
red
B
orange
C
colourless
D
yellow
correct option: c
Users' Answers & Comments5
When iron is exposed to moisture and it rusts, the value of ΔG for the reaction is
A
neutral
B
zero
C
positive
D
negative
correct option: d
Users' Answers & Comments6
In which of the following reactions can the oxidation number of the nitrogen be said to have increased?
A
2NO(g) + O2(g) → 2NO2(g)
B
NO(g) + Cl2(g) → NOCl2(l)
C
FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
D
NO(g) + Br2(l) → NOBr2(l)
correct option: a
Users' Answers & Comments7
2H2 + O22 → H2+O ΔH = -571kJ
In the equation above, how much heat will be liberated if 12.0g of hydrogen is burnt in excess oxygen?
In the equation above, how much heat will be liberated if 12.0g of hydrogen is burnt in excess oxygen?
A
-1142 kJ
B
-571 kJ
C
+1142 kJ
D
-1713 kJ
correct option: d
2H2 + O22 → H2+O ΔH = -571kJ
4.0g of Hydrogen burn in air to produce -571 kJ
∴ 12.0s of Hydrogen will burn in air to produce
(12 * -571)/4 = -1713kJ
Users' Answers & Comments4.0g of Hydrogen burn in air to produce -571 kJ
∴ 12.0s of Hydrogen will burn in air to produce
(12 * -571)/4 = -1713kJ
8
A concentrated solution containing H+, Cu2+, OH- and Cl- was electrolyzed using platinum electrodes.
The ion that will be discharged at the cathode is
The ion that will be discharged at the cathode is
A
Cu2+
B
Cl-
C
H+
D
OH-
correct option: a
Users' Answers & Comments9
When sulphur (IV) oxide is passed into a solution of sodium hydroxide for a long time, it eventually produces a solution of
A
NaHSO4
B
Na2SO3
C
NaHSO3
D
Na2SO4
correct option: b
Users' Answers & Comments10
What is the correct IUPAC name for NO2-?
A
Dioxonitrate (IV) ion
B
Trioxonitrate (III) ion
C
Trioxonitrate (IV) ion
D
Dioxonitrate (II) ion
correct option: d
Users' Answers & Comments