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chemistry Practice tests Neco, Jamb, Wascce,SSce, Sat, Gre, Toefel, Gmat Online

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In which of the following is the oxidation number of sulphur equal to -2?




S8
B


H2S
C


SO2
D

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In the electrolysis of CuSO4(aq) using platinum electrodes, the reaction at the anode is




4OH-  - 4e-  --> 2H2
B


2OH- - 2e- --> 2OH
C


2OH- + 20H- --> 2H2O
D

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If the heat of combustion of hydrogen is -285.8kJ, what is the heat of formation of.water?




-571.6 kJ
B


-285.8 kJ
C


+285.8 kJ
D

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