Chemistry Past Questions and Answers

The solubility of Na₃AsO₄(H₂O)₁₂ is 38.9g per 100g H₂O. What is the mass percentage of Na₃AsO₄ in the saturated solution?
(As = 75, Na = 23, O = 16, H = 1)

In which of the following are the aqueous solutions of each of the substances correctly arranged in order to decreasing acidity?

If 24.83 cm³ of 0.15 M NaOH is titrated to its end point with 39.45 cm³
of HCl, what is the molarity of the HCl?

The atomic numbers of two elements X and Y are 12 and 19 respectively. The bond of these two elements is?

If d represents the density of a gas and K is a constant, the rate of gaseous diffusion r is related to d by the equation?