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One of the criteria for confirming the purity of benzene is to determine its
Which of the following CANNOT be an empirical formula?
\(Cu\) and \(HNO_{3}\) are not suitable for preparing hydrogen gas because of their
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)\(_{2}\)?
Which of the following statements best explains the difference between a gas and a vapour?
The diagram above illustrates a conical flask containing water and ice. Which of the following is correct about the diagram?
The position of equilibrium in a reversible reaction is affected by
The following factors would contribute to environmental pollution except
The most suitable substance for putting out petrol fire is
The number of Hydrogen ions in 1.0\(dm^{3}\) of 0.02\(moldm^{-3}\) tetraoxosulphate(VI) acid is \([N_{A} = 6.02 \times 10^{23}]\)
Stainless steel is an alloy comprising of
The valence electrons of \(_{12}Mg\) are in the
The preferential discharge of ions during electrolysis is influenced by the
When substance X was added to a solution of bromine water, the solution became colourless. X is likely to be
When a salt is added to its saturated solution, the salt
At what temperature does the solubility of \(KNO_{3}\) equal that of \(NaNO_{3}\)?
Pure water can be made to boil at a temperature lower than 100°C by
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)
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
Ethene is produced from ethanol by