Chemistry Past Questions and Answers

Which of the following can be added to dissolve the precipitate formed in the reaction represented by the following equation? CaCl<sub style='font-size: smaller;'>2(aq)</sub> + H<sub style='font-size: smaller;'>2</sub>C<sub style='font-size: smaller;'>2</sub>O <sub style='font-size: smaller;'>4(s)</sub> ⇌ CaC <sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>2</sub>

The spontaneity of a chemical reaction is determined by the change in the

Two metallic ions commonly present in hard water are

Rusting of iron is an example of

Aluminium is extracted from