What accounts for the low melting and boiling points of covalent molecules?
Trả lời
(A)
They have weak intermolecular forces
25
Iron produced directly from a blast furnace is
Trả lời
(C)
pig iron
26
What is the molecular mass of an alkanoic acid, if 0.5 mole of the acid weighs 44g?
Trả lời
(B)
88
27
Alkenes are represented with the general molecular formula
Trả lời
(A)
C\(_n\)H\(_{2n}\)
28
The major product when 2-methylpropene reacts with HCl is
Trả lời
(A)
2-chloro, 2-methylpropane
29
In the laboratory preparation of Chlorine, the gas is passed through a wash bottle of water to
Trả lời
(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
Trả lời
(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
Trả lời
(B)
diffusion
32
A metal that can be found in the free state in nature is
Trả lời
(A)
silver
33
Which of the following has the highest boiling point?
Trả lời
(D)
CH\(_3\)CH\(_2\)CH\(_2\)OH
34
From the graph, it can be inferred that
Trả lời
(D)
solubility of Y increases steadily as temperature increases
35
The gas that is commonly used to demonstrate the fountain experiment is
Trả lời
(A)
hydrogen chloride
36
Which of the following statements is false about hard water?
Trả lời
(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]
Trả lời
(D)
30
38
The nitrogenous compound in dead materials in the soil is converted to
Trả lời
(A)
ammonia
39
CH\(_3\)C ≡ CCH(CH\(_3\))\(_2\)
The IUPAC nomenclature of the compound above is
Trả lời
(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
Trả lời
(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
Trả lời
(A)
oxidized
43
An example of a physical change is
Trả lời
(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
Trả lời
(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
Trả lời
(A)
group 7
46
A molecule with a polar covalent bond between atoms exhibits
Trả lời
(A)
unequal sharing of electron pair
47
Mg + Pb\(^{2+}\) → Mg\(^{2+}\) + Pb
What is the cell notation for the cell reaction above?
Trả lời
(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]
Trả lời
(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?
Trả lời
(B)
8.0
50
The process by which iron corrodes is
Trả lời
(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.
Trả lời
(D)
20.0
52
The reaction above is
Trả lời
(B)
substitution
53
The gas produced at the cathode during electrolysis of brine is
Trả lời
(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
Trả lời
(D)
propanoic acid and ethanol
58
The stainless steel alloy is used for making
Trả lời
(A)
cutlery
59
The gas that ammoniacal solution of CuCl\(_2\) is used to absorb from producer or water gas is
Trả lời
(B)
CO
60
The liquid state of water at room temperature is as a result of
Trả lời
(D)
hydrogen bond
61
The process that illustrates reformation of petroleum product is
Trả lời
(B)
cyclohexane to benzene
62
The source of carbon(II)oxide that acts as air pollutant is
Trả lời
(C)
combustion of fuel
63
If there is no change in volume in a gaseous reaction, the pressure will
Trả lời
(C)
have no effect on equilibrium position
64
The IUPAC nomenclature of the compound above is
Trả lời
(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.
Trả lời
(B)
30
66
The evaluation of petrol from crude oil before it is put on sale is to prevent
Trả lời
(A)
pinking
67
The metal used as a packaging material is
Trả lời
(A)
Al
68
The expression above represents
Trả lời
(C)
General gas law
69
The basicity of C\(_2\)H\(_2\)O\(_4\) is
Trả lời
(C)
2
70
Enzymatic conversion of glucose to ethanol is
Trả lời
(C)
fermentation
71
Gold does not require extraction because it is
Trả lời
(C)
free in nature
72
The process employed in the industrial preparation of tetraoxosulphate(VI) acid is
Trả lời
(A)
Contact
73
The catalytic hydrogenation of benzene produces
Trả lời
(D)
cyclohexane
74
A by-product of the alkaline hydrolysis of tristearin is a
Trả lời
(D)
trihydric alkanol
75
2SO\(_2\)\(_{(s)}\) + O\(_2\)\(_{(s)}\) ⇌ 2SO\(_3\) ; ΔG° = - ve
For the above reaction to be feasible
Trả lời
(A)
ΔH = + ve ,ΔS = + ve
76
Sodium in the above reaction is produced by
Trả lời
(C)
Downs process
77
The use of CFCs as a blowing agent has application in
Trả lời
(A)
foam industry
78
The metal that will liberate H\(_2\) gas from dilute HNO\(_3\) is
Trả lời
(B)
Mg
79
Atom with the electron configuration of 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\) belongs to
Trả lời
(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 ]
Trả lời
(C)
60
81
Commercial deodorant is an example of a colloid called
Trả lời
(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)
Trả lời
(B)
89.34 minutes
83
What is the function of concentrated H\(_2\)SO\(_4\)?
Trả lời
(B)
It is a dehydrating agent
84
In oxidation reactions, electrons are
Trả lời
(B)
removed
85
(CH\(_3\))\(_2\)CHCH(OH)CH\(_2\)C(CH\(_3\))\(_3\)
The IUPAC name of the compound above is
Trả lời
(A)
2,5,5-trimethylhexan-3-ol
86
Anti-freeze used in a vehicle radiator is a mixture of water and
Trả lời
(A)
propanetriol
87
Magnesium tetraoxosulphate(VI) salt is commonly used as a
Trả lời
(D)
laxative
88
The constituents of permalloy are Iron and
Trả lời
(A)
Nickel
89
An inflated balloon shrinks when placed in a freezer because the
Trả lời
(C)
gas motion reduces and exert less pressure
90
The compound in which the oxidation state of nitrogen is + 3 is
Trả lời
(B)
N\(_2\)O\(_3\)
91
Na\(_2\)X ⇌ 2Na\(^+\) + X\(^{2-}\)
The bond between Na and X is likely to be
Trả lời
(B)
ionic
92
The compound responsible for the pleasant scent of fruits and perfumes belongs to the class of
Trả lời
(D)
alkanoate
93
The most suitable indicator to be used when reacting ethanedioic acid with potassium hydroxide is
Trả lời
(A)
phenolphthalein
94
Electron configuration of Chlorine atom is
Trả lời
(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
Trả lời
(B)
electrochemical series
96
An importance of solubility is that it
Trả lời
(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.
Trả lời
(B)
180 s
98
The above structure is
Trả lời
(C)
alkanamide
99
The fractions of crude oil are best separated by
Trả lời
(D)
fractional distillation
100
In the equation above, the expression for the equilibrium constant, k\(_c\) is
Trả lời
(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\(^{23}\)]
Trả lời
(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?
Trả lời
(A)
Chlorine gas
103
Freons pollution in the air are released from
Trả lời
(B)
aerosol can
104
In welding and cutting of metals, the organic gas commonly used in the heating process is
