1994 - JAMB Chemistry Past Questions and Answers - page 2
11
An anhydride is an oxide of non-mental?
A
which will not dissolve in water
B
whose solution in water has a pH greater than 7
C
whose solution in water has a pH less than 7
D
whose solution in water has a pH of 7
correct option: c
Users' Answers & Comments12
MnO4(aq) + 8H + (aq) + 5Fe2+ → Mn2+(aq) + 4H2O(I). The oxidation number of manganese in the above reaction changed from?
A
+7 to +2
B
+6 to +2
C
+5 to +2
D
+4 to +2
correct option: a
Users' Answers & Comments13
Which of the following is TRUE of Le Chatelier's Principle for an exothermic reaction?
A
Increase in temperature will cause an increase in the equilibrium constant
B
Increase in temperature will cause a decrease in the equilibrium constant
C
Addition of a catalyst will cause an increase in the equilibrium constant
D
Addition of a catalyst will cause a decrease in the equilibrium constant
correct option: b
Users' Answers & Comments14
Which of the following are produced when ammonium trioxonitrate (V) crystals are cautiously heated in a hard glass round bottomed flask?
A
N2O and steam
B
NO2 and ammonia
C
N2O2 and NO2
D
NO and NO2
correct option: a
Users' Answers & Comments15
Which of these metals CANNOT replace hydrogen from alkaline solutions?
A
Alulinium
B
Zinc
C
Tin
D
Iron
correct option: d
Users' Answers & Comments16
Clothes should be properly rinsed with water after bleaching because?
A
the bleach decolourizes the cothes
B
chlorine reacts with fabrics during bleaching
C
the clothes are sterilized during bleaching
D
hydrogen chloride solution is produced during bleaching
correct option: d
Users' Answers & Comments17
Which of these solutions will give a white precipitate with a solution of barium chloride acidified with hydrochloric acid?
A
Sodium trioxocarbonate (IV)
B
Sodium tetraoxosulphate (IV)
C
Sodium trioxosulphate (IV)
D
Sodium sulphide
correct option: a
Users' Answers & Comments18
SO3 is NOT directly dissolved in water in the preparation of H2SO4 by the contact process because?
A
the reaction between SO3 and water is violently exothermic
B
acid is usually added to water and never water to acid
C
SO3 does not dissolve in water readily
D
SO3 is an acid gas
correct option: a
Users' Answers & Comments19
In an electrolytic set-up to protect iron from corrosion, the iron is?
A
made cathode
B
made anode
C
used with a metal of lower electropositive potential
D
initially coated with tin
correct option: d
Users' Answers & Comments20
Which of the following is NOT true of metals?
A
They are good conductors of electricity
B
They ionize by electron loss
C
Their oxides are acidic
D
They have high melting points
correct option: c
Users' Answers & Comments