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