FREE CHEMISTRY QUESTIONS

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A small quantity of solid ammonium chloride (NH4Cl) was heated gently in a test tube, the solid gradually disappeared to produce a mixture of two gases. Later a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone A. Distillation B. Sublimation C. Precipitation D. Evaporation E. Decomposition
Brass and Bronze are both metallic alloys. Which of the following is common to both alloys? A. Tin B. Zinc C. Copper D. Lead E. Aluminum
Which of the following changes is physical? A. Adding iron filling to aerated water B. Adding sodium metal to water C. Cooling a solution of iron(ii) sulphate to obtain the hydrated salt D. Cooling water to obtain ice E. Burning the domestic gas (utilgas) for cooking
By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and. Potassium nitrate. A. Sand B. Lead nitrate C. Sugar D. Starch
In titration involving sodium hydroxide solution and dilute hydrochloric acid, where would you placed the base? A. In the baker B. In the conical flask C. In the burette D. In the standard flask E. In the measuring
Which of the following substances would you use as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralization)?
A. Litmus paper B. Phenolphthalein
C. Methyl orange D. Universal indicat
Phosphorous burns in oxygen according to the equation P4+5O2→P4O10 how many litres of oxygen will be required at S.T.P. for complete oxidation of 12.4g of phosphorous? A. 5.20 B. 11.20 C. 2.24 D. 20.20 E. 6.20
[P = 31, O=16 and molar volume of a gas at S.T.P. =22.4litres
One of the following techniques can be used to show that
chlorophyll pigment is a mixture of chemical compounds and
not a single coloured compound.
A. Crystallization B. Hydrolysis
C. Sublimation D. Filtration
E. Chromatography
When candle wax is heated, it softens and then melts over a range of temperatures. This observation shows that wax is a
A. Hydrocarbon B. Polymer
C. Mixture D. Lubricant
A physical change is
A. Fermenting of sugar ethanol B. Rusting of iron C. Burning of paper D. Dissolving sugar in water
An element X form the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrate
A. Law of multiple proportion B. Law of chemical proportion C. Law of simple proportion D. Law of conversation of mass
E. Law of definite proportion
1s2, 2s2, 2p6, 3s2, 3p6, 3d7, 4s2. An element with the electronic configuration above is a A. Non- metal B. Metal C. Transition metal D. Group two elements.
Sieving is a technique used to separate mixture containing
solid particles of
A. Small sizes B. Large sizes
C. Different sizes D. The same sizes
Mg(s) + 2HCl(g) → MgCl2(aq) + H2(g)
From the following above, the mass of magnesium required to react with 250cm3 of 0.5M HCl is [Mg = 24]
A. 0.3g B. 1.5g C. 2.4g D. 3.05
In which of the following are water molecules in the most disorderly arrangement?
A. Ice at – 10oC B. Ice at – 0oC
C. Water at 100oC D. Steam at 100oC
Which of the following is false about an element Y whose electronic configuration is 1s22s22p63s23p5?
A. It has five valence electrons in its shell valence B. It has atomic number 17
C. It is a non-metal
D. It is a halogen
Potassium atom and potassium ion have the same A. Electronic structure B. Electric charge
C. Number of neutrons D. Number of electrons
The electronic configuration that corresponds to that of Cl given that chlorine atom is 1735Cl is
A. 1s22s22p63s2 B. 1s22s22p63s23p6
C. 1s22s22p63s23p5 D. 1s22s22p63s23p4
Which of 3d, 4s, 4p, 4d has the lowest energy?
A. 3d B. 4s C. 4p D. 4d
One of the following is an exception to organic compounds. A. CH3COOH B. C6H12O6 C. CH3OCH3 D. NaHCO3

The hybridization of carbon atom b is __________ A. SP3 B. SP2 C. SP D. S2P3
An organic compound was found to contain 40% carbon, 6.7% hydrogen and the rest oxygen. It has a relative molecular mass of , its molecular formular is _________ A. C3H6O3 B. C6H12O6 C. C5H10O5 D. C4H8O4
An organic compound with functional group

Belongs to what homologues seried A. Alkanoic acid B. Alkanal C. Alkanone D. Alkanoatre

24. A bond, atom, group of atoms or radical, that is common to every member of an homologous series, and determines their properties is called A. Functional group B. Homologous series C. Isomerism D. Allotrope

25. Which of these is false of sp2 hybridized compounds? A. They have at least one double bond B. They have a bond angle of 109.5° C. They have a bond length of 1.46A° D. compounds are triangular planar in shape

26. The distinguishing feature of structural formula is ___________ A. molecular simplicity B. Actual ratio of combination C. spatial orientation D. variability in forms

27. 50cm3 of hydrogen gas were reacted with 30cm3 of oxygen gas at stp. If the residual gases were passed through alkaline solution of pyrogallol, what volume of gas is left over? A. 55cm3 B. 5cm3 C. 50cm3 D. 10cm3

28. One of the following gases can be obtained by downward delivery. A. CH4 B. H2 C. CO2 D. He

29. When titrating a weak acid against a strong base, ___________ is the indicator of choice A. phenolphthalein B. Methyl orange C. Litmus paper D. methyl red

30. During the electrolysis of acidified water, the product obtained at the cathode is _____________ A. oxygen B. Hydrogen C. Sulphur(iv)oxide D. steam

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