Chemistry (JAMB) scoreboard
Chemistry (JAMB) Questions
#1.
Which of the following is an example of a mixture?
#2.
Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V)
[Ca = 40, N = 14, O = 16]
#3.
The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the
#4.
The volume of a given gas is Vcm3 P mm Hg. what is the new volume of the gas if the pressure is reduced to half at constant temperature?
#5.
Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the
#6.
How many unpaired electron(s) are there in the nitrogen sub-levels?
#7.
The stability of the noble gases is due to the fact that they
#8.
The maximum number of electrons in the L shell of an atom is
#9.
Elements in the same period in the periodic table have the same
#10.
21D + 31T→ 42He +10n +energy The reaction above illustrates
#11.
A noble gas with a high power of fog penetration used in aerodrome beacons is
#12.
Permanent hardness of water can be removed by
#13.
Substance employed as drying agents are usually
#14.
Calculate the solubility in mol dm-3 of 40g of CuSO4 dissolved in 100g of water at 120⁰C.
[Cu = 64, S = 32, O = 16]
#15.
Coffee stains can best be removed by
#16.
Carbon (II) oxide is considered dangerous if inhaled mainly because it
#17.
The acid that is used to remove rust is
#18.
Calculate the volume of 0.5 mol dm-3 H2SO4 that is neutralized by 25 cm3 of 0.1 mol dm-3 NaOH
#19.
The colour of methyl orange in alkaline medium is
#20.
Which of the following salts is slightly soluble in water?
#21.
6AgNO4(aq) + PH3(g) + 3H2O(l) → 6Ag(s) + H3PO3(g) + 6HNO3(aq) In the above reaction, the reducing agent is
#22.
The IUPAC nomenclature of the compound LiAlH4 is
#23.
Iron can be protected from corrosion by coating the surface with
#24.
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]
#25.
In which of the following is the entropy change positive?
#26.
If a reaction is exothermic and there is a great disorder, it means that
#27.
In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by
#28.
2H2(g) + O2(g) ⇋ 2H2O(g) ΔH = - ve. What happens to the equilibrium constant of the reaction above if the temperature is increased?
#29.
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
#30.
A constituent common to bronze and solder is
#31.
When iron is exposed to moist air, it gradually rusts. This is due to the formation of
#32.
Stainless steel is used for making
#33.
The residual solids from the fractional distillation of petroleum are used as
#34.
Which of the following is used as fuel in miners' lamp?
#35.
Benzene reacts with hydrogen in the presence of nickel catalyst at 180⁰C to give
#36.
Which of the following is used to hasten the ripening of fruit?
#37.
The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride andThe final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and
#38.
One of the major uses of alkane is
#39.
The haloalkanes used in dry-cleaning industries are
#40.
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?
#41.
What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution?
[Na = 23, O = 16, H = 1]
#42.
Which of the following properties is NOT peculiar to matter?
#43.
The principle of column chromatography is based on the ability of the constituents to
#44.
Which of the following questions is correct about the periodic table?
#45.
An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is
#46.
The molecular lattice of iodine is held together by
#47.
The arrangement of particles in crystal lattices can be studied using
#48.
The importance of sodium aluminate (III) in the treatment of water is to
#49.
What type of bond exits between an element X with atomic number 12 and Y with atomic number 17?
#50.
Hardness of water is mainly due to the presence of