Chemistry Past Questions and Answers

(a) List two gases which are monatomic
(b) Mention one gas which forms:
(i) dense white fumes with ammonia vapour
(ii) yellow precipitate with ammoniacal silver trioxonitrate (V) solution.

(a) State three postulates of the kinetic theory
(b) Name the process involved in the;
(i) spread of the smell of a perfume across a room
(ii) decrease in the yellow of a liquid after exposure in an open vessel.

(a) What is the anhydride of each of the following acids?:
(i) H\(_2\)SO\(_4\)
(ii) HNO\(_3\)

(b) Classify each of the: following as normal salt/acid salt/basic salt/double salt
(i) Sodium hydrogentrioxocarbonate (IV)
(ii) Iron (III) chloride
(iii) Sodium ethanoate.

(a)(i) State two physical properties of hydrogen sulphide
(ii) Name the laboratory equipment used for intermittent production of hydrogen sulphide
(b) What property of hydrogen sulphide is illustrated in the reaction represented by the following equation?
H\(_2\)S\(_{(g)}\) + 2NaOH\(_{(aq)}\) \(\to\) Na\(_2\)S\(_{(aq)}\) + H\(_2\)O\(_{(l)}\)

(a) The elements listed below to the same group in the Periodic Table \(_9F\) \(_{17}CI\) \(_{35}Br\) \(_{53}I\).
(i) Write the electronic structure of the first member
(ii) What is the family name of the elements.
(iii) Which of the elements has the strongest oxidizing ability?

(b) Use the information provided in the following table to answer Questions (i) to (ii) below
(b)(i) Which of the chlorides would exist as discrete molecules?
(ii) What type of bonding holds atoms of A and chlorine together in ACI?
(iii) Which of the chlorides would be a good conductor of electricity?