What accounts for the low melting and boiling points of covalent molecules?
คำตอบ
(A)
They have weak intermolecular forces
25
Iron produced directly from a blast furnace is
คำตอบ
(C)
pig iron
26
What is the molecular mass of an alkanoic acid, if 0.5 mole of the acid weighs 44g?
คำตอบ
(B)
88
27
Alkenes are represented with the general molecular formula
คำตอบ
(A)
C\(_n\)H\(_{2n}\)
28
The major product when 2-methylpropene reacts with HCl is
คำตอบ
(A)
2-chloro, 2-methylpropane
29
In the laboratory preparation of Chlorine, the gas is passed through a wash bottle of water to
คำตอบ
(B)
absorb HCl gas
30
Carbohydrates can generally be represented by the general formula C\(_x\)(H\(_2\)O)\(_y\), for fructose the value for "X" is
คำตอบ
(D)
6
31
If a gold bar and a silver bar are tied together firmly and left for years, some of the gold particles will be found in the silver bar due to
คำตอบ
(B)
diffusion
32
A metal that can be found in the free state in nature is
คำตอบ
(A)
silver
33
Which of the following has the highest boiling point?
คำตอบ
(D)
CH\(_3\)CH\(_2\)CH\(_2\)OH
34
From the graph, it can be inferred that
คำตอบ
(D)
solubility of Y increases steadily as temperature increases
35
The gas that is commonly used to demonstrate the fountain experiment is
คำตอบ
(A)
hydrogen chloride
36
Which of the following statements is false about hard water?
คำตอบ
(B)
Cannot be supplied in pipes made of leads
37
The empirical mass of C\(_6\)H\(_{12}\)O\(_6\) is
[H =1, C = 12, O = 16]
คำตอบ
(D)
30
38
The nitrogenous compound in dead materials in the soil is converted to
คำตอบ
(A)
ammonia
39
CH\(_3\)C ≡ CCH(CH\(_3\))\(_2\)
The IUPAC nomenclature of the compound above is
คำตอบ
(B)
4-methylpent-2-yne
40
In the laboratory preparation of oxygen using potassium trioxochlorate(V), tetraoxomanganate (VII), usually not recommended in modern laboratory because
คำตอบ
(A)
it forms explosive mixture with carbonaceous materials
41
The type of bond between copper(II) tetraamine and chlorine in [Cu(NH\(_3\))\(_4\)]Cl\(_2\)
In the reaction above, magnesium is a reducing agent because
คำตอบ
(A)
oxidized
43
An example of a physical change is
คำตอบ
(C)
dissolving sodium chloride in water
44
When a sample of air is passed through alkaline pyrogalol, potash and finally through U-tube containing fused calcium chloride, the components of air left unabsorbed are
คำตอบ
(C)
noble gases and nitrogen
45
An atom of element with the configuration 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\)3P\(^5\) is likely to belong to
คำตอบ
(A)
group 7
46
A molecule with a polar covalent bond between atoms exhibits
คำตอบ
(A)
unequal sharing of electron pair
47
Mg + Pb\(^{2+}\) → Mg\(^{2+}\) + Pb
What is the cell notation for the cell reaction above?
คำตอบ
(C)
MgIMg\(^{2+}\)IIPb\(^{2+}\)IPb
48
The correct arrangement of gases in the order of increasing rate of diffusion is
[H = 1, C = 12, N = 14, O = 16, S = 32]
คำตอบ
(B)
SO\(_2\), O\(_2\), NH\(_3\), H\(_2\)
49
In a series of solutions with pH of 2.5, 3.5, 7.0 and 8.0, which is likely to turn red moist litmus paper blue?
คำตอบ
(B)
8.0
50
The process by which iron corrodes is
คำตอบ
(A)
rusting
51
On heating 12.5g of saturated solution to dryness at 60\(^0\)C, 2g of anhydrous salt was recovered, calculate its solubility in grams per 100g of water.
คำตอบ
(D)
20.0
52
The reaction above is
คำตอบ
(B)
substitution
53
The gas produced at the cathode during electrolysis of brine is
คำตอบ
(D)
hydrogen
54
An example of a salt that can dissolve in water to form a solution with a pH of 7.
From the condensed structure above, the reactants are
คำตอบ
(D)
propanoic acid and ethanol
58
The stainless steel alloy is used for making
คำตอบ
(A)
cutlery
59
The gas that ammoniacal solution of CuCl\(_2\) is used to absorb from producer or water gas is
คำตอบ
(B)
CO
60
The liquid state of water at room temperature is as a result of
คำตอบ
(D)
hydrogen bond
61
The process that illustrates reformation of petroleum product is
คำตอบ
(B)
cyclohexane to benzene
62
The source of carbon(II)oxide that acts as air pollutant is
คำตอบ
(C)
combustion of fuel
63
If there is no change in volume in a gaseous reaction, the pressure will
คำตอบ
(C)
have no effect on equilibrium position
64
The IUPAC nomenclature of the compound above is
คำตอบ
(C)
ethyl propanoate
65
If 5g of Iron filling was reacted with excess dilute H\(_2\)SO\(_4\) to evolve hydrogen gas, which came to completion after 10 min, calculate the rate of reaction in g/hr.
คำตอบ
(B)
30
66
The evaluation of petrol from crude oil before it is put on sale is to prevent
คำตอบ
(A)
pinking
67
The metal used as a packaging material is
คำตอบ
(A)
Al
68
The expression above represents
คำตอบ
(C)
General gas law
69
The basicity of C\(_2\)H\(_2\)O\(_4\) is
คำตอบ
(C)
2
70
Enzymatic conversion of glucose to ethanol is
คำตอบ
(C)
fermentation
71
Gold does not require extraction because it is
คำตอบ
(C)
free in nature
72
The process employed in the industrial preparation of tetraoxosulphate(VI) acid is
คำตอบ
(A)
Contact
73
The catalytic hydrogenation of benzene produces
คำตอบ
(D)
cyclohexane
74
A by-product of the alkaline hydrolysis of tristearin is a
คำตอบ
(D)
trihydric alkanol
75
2SO\(_2\)\(_{(s)}\) + O\(_2\)\(_{(s)}\) ⇌ 2SO\(_3\) ; ΔG° = - ve
For the above reaction to be feasible
คำตอบ
(A)
ΔH = + ve ,ΔS = + ve
76
Sodium in the above reaction is produced by
คำตอบ
(C)
Downs process
77
The use of CFCs as a blowing agent has application in
คำตอบ
(A)
foam industry
78
The metal that will liberate H\(_2\) gas from dilute HNO\(_3\) is
คำตอบ
(B)
Mg
79
Atom with the electron configuration of 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\) belongs to
คำตอบ
(C)
Group 2 and Period 3
80
The relative molecular mass of an alkanoic acid with the empirical formula of CH\(_2\)O is
[ H = 1, C = 12, O = 16 ]
คำตอบ
(C)
60
81
Commercial deodorant is an example of a colloid called
คำตอบ
(A)
aerosol
82
Calculate the time required to liberate 9g of Aluminium metal, when a current of 18A is passed through it.
(1F = 96500C , Al = 27)
คำตอบ
(B)
89.34 minutes
83
What is the function of concentrated H\(_2\)SO\(_4\)?
คำตอบ
(B)
It is a dehydrating agent
84
In oxidation reactions, electrons are
คำตอบ
(B)
removed
85
(CH\(_3\))\(_2\)CHCH(OH)CH\(_2\)C(CH\(_3\))\(_3\)
The IUPAC name of the compound above is
คำตอบ
(A)
2,5,5-trimethylhexan-3-ol
86
Anti-freeze used in a vehicle radiator is a mixture of water and
คำตอบ
(A)
propanetriol
87
Magnesium tetraoxosulphate(VI) salt is commonly used as a
คำตอบ
(D)
laxative
88
The constituents of permalloy are Iron and
คำตอบ
(A)
Nickel
89
An inflated balloon shrinks when placed in a freezer because the
คำตอบ
(C)
gas motion reduces and exert less pressure
90
The compound in which the oxidation state of nitrogen is + 3 is
คำตอบ
(B)
N\(_2\)O\(_3\)
91
Na\(_2\)X ⇌ 2Na\(^+\) + X\(^{2-}\)
The bond between Na and X is likely to be
คำตอบ
(B)
ionic
92
The compound responsible for the pleasant scent of fruits and perfumes belongs to the class of
คำตอบ
(D)
alkanoate
93
The most suitable indicator to be used when reacting ethanedioic acid with potassium hydroxide is
คำตอบ
(A)
phenolphthalein
94
Electron configuration of Chlorine atom is
คำตอบ
(A)
1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\)3P\(^5\)
95
A table in which metals are arranged in series according to their comparative tendencies to give up their valence electrons is
คำตอบ
(B)
electrochemical series
96
An importance of solubility is that it
คำตอบ
(A)
determines the amount of solute that can dissolve in a given amount of solvent
97
The disintegration of radioactive phosphorus to silicon follows the first order kinetics with rate constant k\(_1\) = 3.85 x 10\(^{-3}\). Determine the half life of phosphorus.
คำตอบ
(B)
180 s
98
The above structure is
คำตอบ
(C)
alkanamide
99
The fractions of crude oil are best separated by
คำตอบ
(D)
fractional distillation
100
In the equation above, the expression for the equilibrium constant, k\(_c\) is
คำตอบ
(D)
\(\frac{[X_2][Y_2]^3}{[XY_3]^2}\)
101
How many molecules are there in 4.0 moles of glucose?
[Avogadro's number = 6.02 x 10\(^{23}\)]
คำตอบ
(B)
2.41 x 10\(^{24}\)
102
What is the product obtained at the anode in the electrolysis of concentrated sodium chloride using graphite electrode?
คำตอบ
(A)
Chlorine gas
103
Freons pollution in the air are released from
คำตอบ
(B)
aerosol can
104
In welding and cutting of metals, the organic gas commonly used in the heating process is
