Chemistry Past Questions and Answers

An element, Z froms an anion whose formula is [Z(CN)₆]^y. If Z has an oxidation number of +2, what is the value of y?

The combustion of ethene, C ₂H ₄, is given by the equation C ₂H ₄ + 30 ₂ → 2CO₂ + 2H₂ O; ∆H = - 1428 KJ. If the molar heats of formation of water and carbon (IV) oxide are - 286 kJ and - 396 kJ respectively, calculate the molar heat of formation of ethene in KJ

Which of the following represents the balanced equation for the reaction of copper with concentrated trioxonitrate (V) acid?

The catalyst used in the contact process for the manufacture of tetraoxosulphate (VI) acid is

Some products of destructive distillation of coal are