UTME CBT FREE Practice Test – Chemistry

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50 cm3 of a gas was collected over water at 10oC and 765 mm Hg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at10oC is 5mm Hg.

A. 49.19 cm3    B. 48.87 cm3    C. 48.55 cm3   D. 48.23 cm3

A gas occupies 30.0 dm3 at S.T.P. What volume would it occupy at 91°C and 380 mm Hg?  

A. 20.0 dm3   B. 40.0 dm3   C. 60.0 dm3   D. 80.0 dm3

The normal boiling point of a liquid is defined as ______

A. the temperature at which its vapour pressure equals the atmospheric pressure
B. the temperature at which bubbles begins to form
C. the temperature at which the vapour pressure equals 1 temperature
D. the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid

Hardness of water is mainly due to the presence of ______

A. calcium hydroxide or magnesium hydroxide
B. calcium trioxocarbonate (IV) or calcium tetraoxosuiphate (VI)
C. sodium hydroxide or magnesium hydroxide
D. calcium chloride or sodium chloride salts.

Which of the following gases may not be dried with concentrated sulphuric acid?  

A. NH3    B. N2    C. Cl2   D. SO2

Which of the following statements is true about 2-methylpropane and butane?

A. They are members of the same homologous series.
B. They have the same boiling points.
C. They have different number of carbon atoms.
D. They have the same chemical properties.

What is the molecular formula of a compound with empirical formula CH2 and vapour density 42? [C=12, H=1]

(a) C6H12   (b) C3H6    (c) C4H8    (d) C5H10

Which of the following salts will turn blue litmus red?

A. Sodium tetrahydroxozincate(II).
B. Potassium hydrogentetraoxosulphate(Vl).
C. Sodium trioxocarbonate(IV).
D. Zinc chloride hydroxide.

The main function of limestone in the blast furnace is to ________

A. act as catalyst.       B. act as reducing agent.      C. remove impurity.      D. supply carbon (IV) oxide.

The preference in the usage of asbestos support to platinum block as a catalyst can be attributed to its _______

(a) increased surface area
(b) high concentration
(c) low concentration
(d) decreased surface area

Five compounds R, T, W, X, and Y form the following compounds:  

i. a basic hydride R.H,
ii. anacidic hydride YH,
iii. amphoteric oxide W2O3, XO2.

Which of the elements is an alkali?  

A. R    B. T   C. W   D. X

What happens at the cathode during electrolysis? The ________

A. anion is oxidized.     B. anion loses electrons.     C. cation is oxidized.     D. cation is discharged.

The IUPAC name for

   is _______

A. 2-methylbut-3-ene    B. 2-methylbut-4-ene   C. 3-methylbut-2-ene    D. 3-methylbut-1-ene

Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by ______ 

A. passing each gas through bromine water
B. passing each gas through dilute potassium permanganate solution
C. passing each gas through silver nitrate solution
D. treating each gas catalytically with excess hydrogen gas

Which of the following hydrocarbons will not undergo polymerization reaction?

(a) C4H8    (b) C3H4    (c) C3H6   (d) C4H10

An organic compound X has the following properties:

i. It is not miscible with water.
ii. It has boiling point of 77°C
iii. it has a sweet odour
iv. It is insoluble in sodium hydrogen carbonate solution
v. It does not decolourise bromine water.

X is therefore ______

A. methane B. ethanoic acid C. ethene D. ethyl ethanoate

200 cm3 of a gas at 25°C exerts a pressure of 700 mmHg. Calculate its pressure if its volume increases 350 cm3 at 75°C.

A. 342.53 mmHg.    B. 1430.54 mmHg.    C. 467.11 mmHg.    D. 400.00 mmHg.

Which of the following arrangements represents the correct order of electronic energy level?

A. 1s 2p 2s 3p 3s 3d 4s.    B. 1s 2s 2p 3s 3p 3d 4s.    C. 1s 2s 2p 3s 3p 4s 3d.    D. 1s 2s 3s 2p 3p 4s 3d.

Diamond is used in making jewelry due to its

(a) high refractive index    (b) transparency    (c) hardness    (d) high melting point

The effect of the presence of impurities such as carbon and sulphur on iron is that they ______

A. give it high tensile strength
B. make it malleable and ductile
C. increase its melting point
D. lower its melting point

What number of moles of Cu2+ will be deposited by 360 coulombs of electricity? [F = 96500 C mol-1]

A. 5.36 x 10-4 mole.    B. 1.87 x 10-3 mole.    C. 9.35 x 10-4 mole.    D. 3.73 x 10-3mole.

How many protons, neutron- and electrons respectively are present in the element

A. 27, 33 and 33.    B. 33, 27 and 27.    C. 27, 33 and 27.    D. 60, 33 and 60.

The purpose of H+ in the reaction above is to

A. increase the yield of products.
B. maintain the solution at a constant pH.
C. increase the rate of hydrolysis.
D. decrease the rate of the reverse reaction.

Calculate the mass of magnesium that would be deposited by 8 faradays of electricity? [Mg = 24]

(a) 96 g   (b) 48 g   (c) 72 g   (d) 120 g

You are provided with five gas jars containing SO2, CO2, H2, CO and NO respectively. Select a test from A to D which will identify ANY ONE of the gases completely. 

A. pass each gas into lime water
B. pass each gas into water and test with litmus paper
C. pass each gas into concentrated sulphuric acid
D. expose each gas to atmospheric air

How many grams of HBr would exactly be required to react with 2 g of propyne? (C = 12, H =1, Br = 80)

A. 4.1 g    B. 6.1 g    C. 8.1 g    D. 10.1 g

The mathematical expression of pH is _______

Which of the following statements is correct?

A. The average kinetic energy of a gas is directly proportional to its temperature
B. At constant temperature, the volume of a gas increases as the pressure increases
C. The pressure of a gas is inversely proportional to its volume
D. The temperature of a gas is directly proportional to its volume

The isomers of C3H8O are _______

A. 1 - propanol and 2- propanol
B. 1 - propanol and 1 - propanal
C. 2 - propanol and 2- propanone
D. 2- propanol and 1 - propanal.

The chemicals used to soften hard water involves the addition of ______

A. insoluble sodium compounds which form soluble solutions of calcium and magnesium ions
B soluble sodium compounds which form soluble solutions of calcium and magnesium ions
C. soluble sodium compounds which form insoluble precipitates of calcium and magnesium ions
D. insoluble sodium compounds which form insoluble precipitates of calcium and magnesium ions.

Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?  

A. Tin    B. Zinc    C. Copper    D. Lead

A gas that forms a black precipitate with lead (ll) ethanoate is

(a) Cl2   (b) NH3    (c) H2    (d) H2S

Which of the following reactions does not take place in the smelting of iron in a blast furnace?

A. CaCO3(s)  CaO(s) + CO2(g)
B. C(s) + O2(g)  CO2(g)
C. 3Fe(s) + 2O2(g)  FeO4(s)
D. SiO2(s) + CaO(s)  CaCO3(s)

Calculate the quantity of electricity in coulombs required to liberate 10g of copper from copper compound. [Cu=64, F=96500 Cmol-1]

A. 32395.5.   B. 30156.3.    C. 60784.5.   D. 15196.5.

Which of the following pollutants is associated with brain damage?

A. Carbon (lI) oxide.    B. Radioactive fallout.    C. Biodegradable waste.    D. Sulphur (IV) oxide.

An increase in the pressure exerted on a gas at a constant temperature results in ______

A. a decrease in the number of effective collisions
B. a decrease in volume
C. an increase in the average intermolecular distance
D. an increase in volume.

A piece of metal (M) is dissolved in nitric acid and the resulting solution ¡s treated with a small quantity of sodium hydroxide to produce a white precipitate (B) which re-dissolves on the addition of excess alkali. The precipitate (B) when ignited in a crucible produces the oxide of the metal (M). The metal M is ______ 

A. Zn    B. Cu    C. Al    D. Au

A chemical reaction in which the hydration energy is greater than the lattice energy is
referred to as _____

A. a spontaneous reaction
B. an endothermic reaction
C. an exothermic reaction
D. a reversible reaction.

When carbon dioxide is bubbled into limewater a white precipitate ¡s formed. If the passage of the gas is continued the precipitate disappears. The reason for this is ______ 

A. calcium carbonates formed which on reaction dissolves
B. calcium hydrogen carbonate is precipitated and then dissolves
C. calcium carbonate is formed which on reaction with further carbon dioxide forms soluble calcium hydrogen carbonate
D. concentration of the solution has occurred with the deposition of calcium hydroxide

On oxidizing anhydrous iron (II) sulphate, in addition to producing iron (III) oxide, which of the following is produced?  

A. SO2(g) + FeS(s).     B. SO3(g) + FeS(s).    C. SO2(g) + SO3(g)     D. SO2(g) + H2S(g)

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