1991 - WAEC Chemistry Past Questions and Answers - page 1
The metal extracted from cassiterite is
In which of the following is the oxidation number of nitrogen zero?
The separation of a mixture of calcium trioxocarbonate (lV) and sodium trioxocarbonate (IV) is most easily carried out by using the differences in their
When air is passed through a heated tube containing finely divided copper, the component that is absorbed in the process is
What is the amount (in mole) of sodium trioxocarbonate (IV) in 5.3 g of the compound? (Na2CO3 = 106)
Which of the processes represented by the following equations has the greatest positive entropy change?
Which of the following elements can from more than one acidic oxide?
CH2 = CH2 + H2SO4 → CH3 - CH2 -OSO3H. The reaction illustrated by the equation above is an example of
Brass is an alloy of copper and
Which of the following formula is that of a dicarboxylic acid?