1993 - WAEC Chemistry Past Questions and Answers - page 2
In which of the following changes is ∆S negative ?
Chlorine is is used in water treatment as
Which of the following pieces of deposited if a current of 10A was passed through a solution of copper(ll) salt for 965 seconds? (1F = 96500 C)
Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by traces of the oxides of
Consider the reaction represented by the following equation CaCI2 (aq) + H 2C2O 4(aq) ⇌ CaC 2O4(s) + 2HCI(aq). Which of the following would dissolve the precipitate of CaC 2O4 formed?
The following gases decolorize bromine water except
What volume of distilled water should be added to 400cm3 of 2.0 mole dm-3 \(H_{2}SO_{4}\) to obtain 0.20 mole dm-3 of solution>
Which of the following indicates the correct increasing order of oxidizing power of the halogens?
Which of the following substances is a peroxide?
The component of air that removed when air is bubbled into alkaline pyrogallol solution is