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The knowledge of half-life can be used to
The figure above shows the electrolysis of molten sodium chloride. Z is the
Which of the following produces relatively few ions in solution?
The choice of method for extracting a metal from its ores depends on the
Calculate the pH of 0.05 moldm\(^{-3}\) H\(_2\)SO\(_4\)
What mass of Cu would be produced by the cathodic reduction of Cu\(^{2+}\) when 1.60A of current passes through a solution of CuSO\(_4\) for 1 hour. (F=96500Cmol\(^{-1}\) , Cu=64)
The solubility of the solids that dissolves in a given solvent with the liberation of heat will
The constituent common to duralumin and alnico is
The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;
Diamond is a bad conductor of electricity because its bonding electrons are used in
To what volume must 300cm\(^3\) of 0.60M sodium hydroxide solution be diluted to give a 0.40M solution?
In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?
Which of the following is used to power steam engines?
2KClO\(_3\)(s) → 2KCl(s) + 3O\(_2\)(g)
The importance of the catalyst in the reaction above is that
In the laboratory preparation of oxygen, the gas cannot be collected by downward displacement of air because
When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;
A balanced chemical equation obeys the law of
Which of the following are mixtures?
I. Petroleum
II. Rubber latex
III. Vulcanizer's solution
IV. Carbon sulphide
The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence of
The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is