30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g).

Calculate the total volume of the gaseous mixture at the end of the reaction

An exothermic reaction is one which involves

Which of the following is an acid salt?

Which of the following compounds dissolves in water to form a solution with pH below 7?

If the solubility of KHCO₃ is 0.40 mole dm^{-3 at room temperature , calculate the mass of KHCO₃ in 100dm3 of the solution at this temperature. [KHCO₃ = 100hmol]}