Chemistry Past Questions and Answers

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)\(_{2}\)?

A 150\(cm^{3}\)
B 75\(cm^{3}\)
C 30\(cm^{3}\)
D 25\(cm^{3}\)

Question 1467:

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

A Reactivity and oxidation respectively
B Conductivity and corrosiveness respectively
C Melting point and reduction respectively
D Electronegativity and solubility respectively

Question 1468:

Which of the following CANNOT be an empirical formula?

A \(CH\)
B \(CH_{2}\)
C \(P_{2}O_{5}\)
D \(N_{2}O_{4}\)

Question 1469:

One of the criteria for confirming the purity of benzene is to determine its

A Heat capacity
B Boiling point
C Mass
D Colour

Question 1470:

When chlorine is passed through a sample of water, the pH of the water sample would be

A < 7
B > 7
C = 7