2018 WAEC SSCE Chemistry Past Questions

2018

Which of the following CANNOT be an empirical formula?

2018

\(Cu\) and \(HNO_{3}\) are not suitable for preparing hydrogen gas because of their

2018

Consider the following reaction equation: \(2HCl + Ca(OH)_{2} \to CaCl_{2} + H_{2}O\). What is the volume of 0.1\(moldm^{-3}\) HCl that would completely neutralize 25\(cm^{3}\) of 0.3\(moldm^{-3}\) Ca(OH)\(_{2}\)?

2018

Which of the following statements best explains the difference between a gas and a vapour?

2018

The diagram above illustrates a conical flask containing water and ice. Which of the following is correct about the diagram?

2018

The position of equilibrium in a reversible reaction is affected by

2018

The following factors would contribute to environmental pollution except

2018

The most suitable substance for putting out petrol fire is

2018

The number of Hydrogen ions in 1.0\(dm^{3}\) of 0.02\(moldm^{-3}\) tetraoxosulphate(VI) acid is \([N_{A} = 6.02 \times 10^{23}]\)

2018

Stainless steel is an alloy comprising of

2018

The valence electrons of \(_{12}Mg\) are in the

2018

The preferential discharge of ions during electrolysis is influenced by the

2018

When substance X was added to a solution of bromine water, the solution became colourless. X is likely to be

2018

When a salt is added to its saturated solution, the salt

2018

At what temperature does the solubility of \(KNO_{3}\) equal that of \(NaNO_{3}\)?

2018

Pure water can be made to boil at a temperature lower than 100°C by

2018

What is the mass of solute in 500\(cm^{3}\) of 0.005\(moldm^{-3}\)\(H_{2}SO_{4}\)? ( H = 1, S = 32.0, O=16.0)

2018

Consider the following equilibrium reaction: \(2AB_{{2}{(g)}} + B_{{2}{(g)}} \to 2AB_{{3}{(g)}}\). \(\Delta H= -X kJmol^{-1}\). The backward reaction will be favored by

2018

Ethene is produced from ethanol by

2018

Consider the following reaction equation: \(Br_{2} + 2KI \to 2KBr + I_{2}\). Bromine is acting as

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