Chemistry Past Questions and Answers

The energy change (ΔH) for the reaction CO(g) + (1)/(2)O<sub style='font-size: smaller;'>2(g)</sub> → is?<br/>(ΔHi(CO) = -110.4 kJ mol<sup style='font-size: smaller;'>-</sup>) (ΔHi(CO<sub style='font-size: smaller;'>2</sub>) = -393 kJ mol<sup style='font-size: smaller;'>-</sup>)

Tetraoxosulphate (IV) ions are finally tested using?

An organic compound decolourized acidified KMnO<sub style='font-size: smaller;'>4</sub> solution but failed to react with ammoniacal silver nitrate solution. The organic compound is likely to be?

Solid sodium hydroxide on exposure to air absorbs a gas and ultimately gives another alkaline substance with the molecular formula?

Which of the following substances is the most abundant in the universe?