Question 1 of 20 2,505 total questions
the minimum amount of energy required for a reaction to take place is
A lattice energy
B ionization energy
C activation energy
D kinetic energy
In an endothermic reaction, if there is a loss in entropy the reaction will
A be indeterminate
B be spontaneous
C not be spontaneous
D be at equilibrium
In an electrochemical cell, polarization is caused by
A chlorine
B oxygen
C tetaoxsulphate (Vl) acid
D hydrogen
2H2 O (l) + 2F2(g) → 4HF(aq) + O2(g) .
A O2(g)
B H2 O(l)
C F2 (g)
D HF(aq)
An insoluble salt can be prepared by
A the reaction of trioxocarbonate (V) with an acid
B double decomposition
C the action of dilute acid on an insoluble base
D the reaction of metals with an acid
Which of the following substances is not a salt?
A Aluminium oxide
B Sodium hydrogentrioxosulphate (V)
C Sodium trioxocarbonate (V)
D Zinc chloride
Three drops of a 1.0 mol dm-3 solution of HCl was added to 20 cm3 of a solution of pH6.4. The pH of the resulting solution will be
A close to that of pure water
B less than 6.4
C greater than 6.4
D unaltered
10.0 dm3 of water was added to 2.0 mol dm-3 of 2.5dm3 solution of HCl. What is the concentration of the final solution in mol dm-3 ?
In a water body, too much sewage leads to
A a decrease in the temperature of the water which cause in death of aquatic animals
B an increase in the number of aquatic animals in the water
C an increase in the bacterial population which reduces the level of oxygen in the water
D a decrease in the bacterial population which increases the level of oxygen in the water
The solvent used for removing grease stain is
A turpentine
B ammonia solution
C ethanol
D solution of borax in water
An example of a hygroscopic substance is
A CuO (S).
B MgCL2(S).
C CaCL2(S).
D NaOH(S).
Steam changes the colour of anhydrous cobalt (ll) chloride from
A white to red
B blue to white
C blue to pink
D white to blue
The constituent of air that acts as a diluent is
A nitrogen
B carbon (IV) oxide
C noble gases
D oxygen
The bond formed between two elements with electron configurations 1s2 2s2 2p6 3s2 and 1s2 2s2 2p4 is
A metallic
B covalent
C dative
D ionic
Which of the following molecules is held together by hydrogen bond?
The shape of the carbon (lV) oxide molecule is
A pyramidal
B linear
C angular
D tetrahedral
The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
A carbon-14
B phosphorus-32
C cobalt-60
D iodine-131
What volume of carbon (ll) oxide is produced by reacting excess carbon with 10 dm3 of oxygen?
A 5 dm 3
B 20 dm 3
C 15 dm 3
D 10 dm 3
The presence of an impurity in substance will cause the melting point to
A be zero
B reduce
C increase
D be stable
An example of oxidation - reduction enzyme is
A amylase
B protease
C lipase
D dehydrogenase
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