Free JAMB 2010 Chemistry past questions with answers and clear explanations. Practice online, track your score, and prepare faster for the UTME.
Maximum Time
Created by: juanbacan
Which of the following is an example of a mixture?
Blood
Common salt
Sand
Washing soda
Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V), Ca(NO3)2. [Ca = 40, N = 14, O = 16]
13.1%
27.6%
8.5%
17.1%
The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that
temperature of the milk drops as it loses heat
water vapour around the bottle gains energy from the bottle
water vapour in the air around the bottle loses energy to the bottle
the saturated vapour pressure of the milk equals the atmospheric pressure
The volume of a gas is V cm3 at P mmHg. What is its new volume if the pressure is reduced to half at constant temperature?
V cm3
V/2 cm3
2V cm3
4V cm3
Across a period from left to right, the general rise in first ionization energy is mainly due to
decrease in screening effect
increase in screening effect
decrease in nuclear charge
increase in nuclear charge
How many unpaired electrons are present in a nitrogen atom’s sublevels?
2
None
3
1
The stability of the noble gases is due to the fact that they
have duplet or octet configurations
have no electron in their outermost shell
belong to group zero of the periodic table
are volatile in nature
The maximum number of electrons in the L shell of an atom is
2
18
8
32
Elements in the same period of the periodic table have the same
number of electron shells
physical properties
atomic number
chemical properties
21D + 31T → 42He + 10n + energy. The reaction illustrates
nuclear fusion
alpha decay
nuclear fission
artificial transmutation
A noble gas with high fog-penetrating power used in aerodrome beacons is
Neon
Argon
Krypton
Helium
Permanent hardness of water can be removed by
boiling
filtration
adding slaked lime
adding caustic soda
Substances used as drying agents are usually
amphoteric
acidic
efflorescent
hygroscopic
Calculate the solubility (mol dm−3) of 40 g of CuSO4 dissolved in 100 g of water at 120 °C. [Cu = 64, S = 32, O = 16]
0.25
2.50
4.00
0.40
Coffee stains can best be removed by
kerosene
carbon tetrachloride
a solution of borax in water
turpentine
Carbon (II) oxide is considered dangerous if inhaled mainly because itcan cause injury to the nervous system
can cause injury to the nervous system
competes with oxygen in the blood
competes with carbon (IV) oxide in the blood
can cause lung cancer
The acid that is used to remove rust is
boric
hydrochloric
trioxonitrate (V)
tetraoxosulphate (VI)
Calculate the volume of 0.5 mol dm-3 H2SO4 that is neutralized by 25 cm3 of 0.1 mol dm-3 NaOH
5.0 cm3
2.5 cm3
0.4 cm3
0.1 cm3
The colour of methyl orange in alkaline medium is
yellow
pink
orange
red
Which of the following salts is slightly soluble in water?
AgCl
CaSO4
Na2CO3
PbCl2
6AgNO4(aq) + PH3(g) + 3H2O(l) → 6Ag(s) + H3PO3(g) + 6HNO3(aq) In the above reaction, the reducing agent is
HNO3(aq)
H2O(l)
PH3(g)
AgNO3(aq)
The IUPAC nomenclature of the compound LiAlH4 is
lithiumtetrahydridoaluminate (III)
aluminium tetrahydrido lithium
tetrahydrido lithium aluminate (III)
lithium aluminium hydride
Iron can be protected from corrosion by coating the surface with
gold
silver
copper
zinc
What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?
[Al = 27, F = 96500 C mol-1]
0.2 g
1.8 g
5.4 g
14.2 g
In which of the following is the entropy change positive?
Thermal dissociation of ammonium chloride
Reaction between an acid and a base
Addition of concentrated acid to water
Dissolution of sodium metal in water
If a reaction is exothermic and there is a great disorder, it means that
the reaction is static
the reaction is in a state of equilibrium
there will be a large increase in free energy
there will be a large decrease in free energy
In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by
lowering the pressure of the reaction
increasing the surface area of the reactant
increase the rate of the reaction
lowering the energy barrier of the reaction
2H2(g) + O2(g) ⇋ 2H2O(g) ΔH = - ve. What happens to the equilibrium constant of the reaction above if the temperature is increased?
it is unaffected
it becomes zero
it decrease
it increases
To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of
CO
Cl-
SO
NO
Which of the following is used in rocket fuels?
HNO3
CH3COOH
H2SO4
HCl
A constituent common to bronze and solder is
lead
silver
copper
tin
When iron is exposed to moist air, it gradually rusts. This is due to the formation of
hydrate iron (III) oxide
anhydrous iron (III) oxide
anhydrous iron (II) oxide
hydrate iron (II) oxide
A compound gives an orangered colour to non-luminous flame. This compound is likely to contain
Na+
Ca2+
Fe3+
Fe2+
Stainless steel is used for making
magnets
tools
coins and medals
moving parts of clocks
The residual solids from the fractional distillation of petroleum are used as
coatings of pipes
raw materials for the cracking process
fuel for the driving tractors
fuel for jet engines
Which of the following is used as fuel in miners' lamp?
Ethanal
Ethyne
Ethene
Ethane
Which of the following organic compounds is very soluble in water?
CH3COOH
C2H2
C2H4
CH3COOC2H5
Benzene reacts with hydrogen in the presence of nickel catalyst at 180⁰C to give
xylene
toluene
cyclopentane
cyclohexane
Which of the following is used to hasten the ripening of fruit?
Ethene
Ethanol
Ethyne
Ethane
The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and
tricloromethane
dichloromethane
tetrachloromethane
chloromethane
The correct order of increasing boiling points of the following compounds C3H7OH, C7H16 and C4H10 is
C3H7OH → C4H10 → C7H16
C4H10 → C7H16 → C3H7OH
C7H16 → C3H7OH → C4H10
C4H10 → C3H7OH → C7H16
One of the major uses of alkane is
as domestic and industrial fuel
in the hydrogenation of oils
in the textile industries
in the production of plastics
The haloalkanes used in drycleaning industries are
trichloromethane and tetrachloromethane
chloroethene and dichloroethene
trichloroethene and tetrachloroethene
chloroethane and dichloroethane
Two hydrocarbons X and Y were treated with bromine water. X decolorized the solution and Y did not not. Which class of compound does Y belong?
Benzene
Alkynes
Alkenes
Alkanes
The compound that is used as an anaesthetic is
CCl4
CH Cl3
CH2Cl2
CH3Cl
¡Aún no hay resultados!
Sé el primero en aparecer aquí