What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution?
[Na = 23, O = 16, H = 1]
Απάντηση
(B)
0.50 mol dm-3
2
Which of the following properties is NOT peculiar to matter?
Απάντηση
(D)
Random motion of particles increases from gas to solid
3
From the diagram above, an ideal can be represented by
Απάντηση
(B)
N
4
Which of the following questions is correct about the periodic table?
Απάντηση
(B)
The valence electrons of the elements increase progressively across the period
5
The relative atomic mass of a naturally occurring lithium consisting of 90% \(^7 _3\)Li and \(^6 _3\)10% Li is
Απάντηση
(A)
6.9
6
An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is
Απάντηση
(B)
15
7
The molecular lattice of iodine is held together by
Απάντηση
(D)
van der Waal's forces
8
The arrangement of particles in crystal lattices can be studied using
Απάντηση
(A)
X - rays
9
From the diagram above, find the amount of solute deposited when 200 cm\(^3\) of the solution is cooled from 55°C to 40°C.
Απάντηση
(B)
0.20mole
10
The importance of sodium aluminate (III) in the treatment of water is to
Απάντηση
(A)
cause coagulation
11
What type of bond exits between an element X with atomic number 12 and Y with atomic number 17?
Απάντηση
(A)
Electrovalent
12
Hardness of water is mainly due to the presence of
Απάντηση
(B)
calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
13
A suitable solvent for iodine and naphthalene is
Απάντηση
(D)
benzene
14
Which of the following noble gases is commonly found in the atmosphere?
Απάντηση
(D)
Argon
15
N2O4(g) ↔ 2NO2(g) ΔH = +ve
In the reaction above, an increase in temperature will
Απάντηση
(A)
increase the value of the equilibrium constant
16
CH3COOH(aq) + OH-(aq) ↔ CH3COO-(aq) + H2O(l)
In the reaction above ,CH3COO-(aq) is
Απάντηση
(A)
conjugate base
17
How many cations will be produced from a solution of potassium aluminium tetraoxosulphate (VI)?
Απάντηση
(D)
2
18
Which of the following is NOT an alkali?
Απάντηση
(B)
Mg(OH)2
19
An effect of thermal pollution on water bodies is that the
Απάντηση
(D)
level of oxygen reduces
20
Which of the following is a deliquescent compound?
Απάντηση
(B)
CaCl2
21
A chemical reaction which the hydration energy is greater than the lattice energy is referred to as
Απάντηση
(C)
an exothermic reaction
22
The function of zinc electrode in a galvanic cells is that it
Απάντηση
(C)
production of electons
23
CH4(g) + Cl2(g) → CH3 Cl(s) + HCl(g)
The major factor that influence the rate of the reaction above is
Απάντηση
(D)
light
24
The condition required for corrosion to take place is the presence of
Απάντηση
(D)
water and oxygen
25
The diagram above best illustrates the effect of decrease in
Απάντηση
(A)
concentration
26
MnO-4(aq) + Y + 5Fe2+(aq) → Mn2+(aq) + 5Fe2+(aq) + 4H2O(l)
In the equation above, Y is
Απάντηση
(D)
8H+(aq)
27
Given that M is the mass of a substance deposited during electrolysis and Q is the quantity of electricity consumed, then Faraday's first law can be written as
[Electrochemical equivalent]
Απάντηση
(B)
M = EQ
28
The impurities formed during the laboratory preparation of chlorine gas are removed by
Απάντηση
(C)
H2SO4
29
The effect of the presence of impurities such as carbon and sulphur on iron is that they
Απάντηση
(D)
lower its melting point
30
A few drops of concentrated HNO\(_3\) is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation present is likely to be
Απάντηση
(C)
Fe3+
31
The bleaching action of chlorine gas is effective due to the presence of
Απάντηση
(B)
water
32
In the laboratory preparation of oxygen, dried oxygen is usually collected over
Απάντηση
(B)
mercury
33
The property of concentrated H2SO4 that makes it suitable for preparing HNO3 is its
Απάντηση
(A)
boiling point
34
Bronze is preferred to copper in the making of medals because it
Απάντηση
(A)
is stronger
35
The constituents of baking powder that makes the dough to rise is
Απάντηση
(A)
NaHCO3
36
The ability of carbon to form long chains is referred to as
Απάντηση
(C)
catenation
37
Which of the following compounds will undergo polymerization reaction?
Απάντηση
(A)
C2H4
38
An organic compound has an empirical formula CH2O and vapour density of 45.
What is the molecular formula?
[C = 12, H = 1, O = 16]
Απάντηση
(C)
C3H6O3
39
At 25o and zymase as catalyst,
C6H126 → 2C2H5OH + 2CO2 + energy
The reaction above represented by the equation above is useful in the production of
Απάντηση
(D)
ethanol
40
The number of isomers that can be obtained from C\(_4\)H\(_{10}\) is
Απάντηση
(D)
2
41
The functional groups present in the compound above are
Απάντηση
(D)
hydroxyl and halo-group
42
Two organic compounds K and L were treated with a few drops of Fehling's solutions respectively . K formed a brick-red precipitate while L, remains unaffected. The compound K is an
Απάντηση
(C)
alkanal
43
Which of the following statements is true about 2-methylpropane and butane
Απάντηση
(D)
They have the same chemical properties
44
with conc H2SO4 as catalyst
CH3COOH + C2H5OH → CH3COOC2H5 + H2O
