SSCE (WAEC and NECO) Practice Test – Chemistry

The element with electron configuration 1s² 2s² 2p⁶ 3s² 3p¹ belongs to ____

A. s-block, period 3, group 1.
B. p-block, period 3, group 2.
C. s-block, period 3, group 3.
D. p-block, period 3, group 3.

Aqueous copper (II) tetraoxosulphate (VI) was electrolysed using the following pairs of electrodes. In which case was there a decrease in the mass of the anode?

Electrode - Cathode                Anode
A.             Graphite                 Graphite
B.             Platinum                 Platinum
C.             Copper                    Copper
D.            Graphite                  Platinum

Which of the following instruments is used in detecting the presence of radiation?

A. Cathode ray tube.    B. Geiger-Muller counter.   C. Mass spectrometer.   D. X-ray tube.

Which of the following pairs of acids and bases will produce a solution with PH less than 7 at equivalence point?

A. HNO₃ and NaOH
B. H₂SO₄ and KOH
C. HCI and Mg(OH)₂
D. HNO₃ and KOH

Which of the following salt is not prepared by precipitation?

A. Lead (II) tnoxocarbonate (IV)
B. Barium trioxocarbonate (IV)
C. Sodium trioxocarbonate (IV)
D. Calcium tnoxocarbonate (IV)

A metal X forms two chlorides with the formulae XCI₂ and XCI₃

What type of bonding exists between X and chlorine in each of the chlorides?

A. Metallic bonding    B. Ionic bonding    C. Covalent bonding    D. Dative bonding

Which of the following equipment is not used to detect radioactivity?

A. Wilson cloud chamber
B. Geiger-Muller counter
C. Mass spectrometer
D. Photographic plate

The separation of petroleum fractions depends on the differences in their

A. melting points.    B. molar masses.    C. solubilities.    D. boiling points.

The IUPAC name of the compound  is


A. 2—amino hexanoic acid.
B. 2—amino—4—methyl pentanoic acid.
C. 2, 4—dimethyl butanoic acid.
D. 4—amino pentanoic acid.

An orange drink concentrate is suspected to contain traces of poisonous green dye, a harmless dye having the same boiling point. Which of the following techniques is most suitable for isolating the dyes?

A. Fractional distillation
B. Paper chromatography
C. Coagulation
D. Recrystallization.

What happens at the cathode during electrolysis? The

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

Rare gases are stable because they

A. are chemically active.
B. contains equal number of protons and neutrons.
C. contains more electrons than protons.
D. has octet structures.

What volume of hydrogen would be left over when 300 cm³ of oxygen and 1000 cm³ of hydrogen are exploded in a sealed tube? [2H_2(g) + O_2(g) ⟶ 2H₂O_(g) ]

A. 200 cm³
B. 400 cm³
C. 600 cm³
D. 700 cm³

Which of the following cells produce electrical energy from chemical reactions?

I. Lead-acid battery    II. Dry cell    III. Daniell cell    IV. Electrolytic cell

A. I and II only     B. I, II and III only.     C. II, III and IV only.     D. I, III and IV only.

In which of the following series are the atoms arranged in order of increasing ionization energy?

A. Li, Na, K.
B. B, Be, Li.
C. O, F, Ne.
D. Be, Mg, Ca.

A substance is said to be impure if

A. its melting point range is wide.
B. it dissolves in water with difficulty.
C. it has a low melting point.
D. it is coloured.

Which of the following gases are arranged in increasing order of diffusion rate?
[H = 1.0; C = 12; N = 14; O = 16; S =32]

A. SO₂, O_2, NH₃, H₂.
B. H₂S, NH₂, O₂, SO₂.
C. CO₂ , N₂O, O₂ SO₂.
D. NH₃, NO₂, N₂, CO₂.

When heat is absorbed during a chemical reaction, the reaction is said to be

A. adiabatic    B. endothermic    C. exothermic.    D. Isothermal.

Two solutions containing Pb²⁺ and Al³⁺ respectively can be distinguished using

A. NaOH_(aq)    B. NH_3(aq)    C. conc NHO₃    D. conc HCI

In the periodic table, alkaline earth metals can be found in group

A. I.    B. II.    C. VI.    D. VII.