Chemistry Past Questions and Answers

Consider the following equation: Cr<sub style='font-size: smaller;'>2</sub>O<sup style='font-size: smaller;'>2-</sup><sub style='font-size: smaller;'>7(aq)</sub> + 14H<sup style='font-size: smaller;'>+</sup><sub style='font-size: smaller;'>(aq)</sub> + 6e<sup style='font-size: smaller;'>-</sup> → 2Cr<sup style='font-size: smaller;'>3+</sup><sub style='font-size: smaller;'>(ag)</sub> + 7H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>(1)</sub>. The oxidation number of chromium changes from

When concentrated sodium chloride solution is electrolysed using inert electrodes, the products are

Which of the following compounds can be represented by the molecular formula C<sub style='font-size: smaller;'>2</sub>H<sub style='font-size: smaller;'>6</sub>O?

When alkynes are hydrogenated completely they produce compounds with the general molecular formula

The reaction between ethene and chlorine to form 1, 2-dichloroethane is