If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is
A. dilute sulphuric acid
B. dilute hydrochloric acid
C. unreacted hydrogen sulphide in water
D. iron (III) chloride
E. Iron (II) chloride

Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. Which behaves as an oxidizing agent?

A. Fe2+
B. Cl2
C. Fe3+
D. Cl-
E. H2O

Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by?

A. passing each gas through bromine water
B. passing each gas through dilute potassium permanganate solution
C. passing each gas through silver nitrate solution
D. treating each gas catalytically with excess hydrogen gas

Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of
A. barium chloride solution
B. dilute hydrochloric acide
C. lead nitrate solution
D. calcium chloride solution
E. sodium hydroxide solution

If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because
A. both zinc and copper are metals
B. the sulphate radical and the zinc ion are divalent
C. zinc is more electropositive than copper
D. both zinc and copper form depositive ions in solution
E. zinc is a reducing agent

Consider the following exothermic reaction
2SO2(g) + O2(g) ↔ 2SO3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then
A. the reaction rate increases
B. concentration of SO3 decreases
C. concentration of SO3 increases
D. SO2 gas becomes unreactive
E. O3 gas becomes unreactive

The most common type of chemical reaction which alkanes undergo is
A. substitution
B. addition
C. condensation
D. polymerisation
E. double decomposition

Which of the following compounds will form a solution if exposed to air?

A. Na2CO3.10H2O
B. NaNO3
C. CuSO4
D. CaCl2
E. Na2SO4.10H2O

The normal boiling point of a liquid is defined as?

A. the temperature at which its vapour pressure equals the atmospheric pressure
B. the temperature at which bubbles begin to form
C. the temperature at which the vapour pressure equals 1 temperature
D. the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid
E. the temperature at which the space above the liquid is saturated

Hypochlorous acid is used as a bleach because
A. it is a strong acid
B. it yields chlorine readily in pure water
C. it is an oxidising agent
D. it is a weak acid
E. it is a reducing agent