Chemistry Past Questions and Answers

The solubility of Na<sub style='font-size: smaller;'>3</sub>AsO<sub style='font-size: smaller;'>4</sub>(H<sub style='font-size: smaller;'>2</sub>O)<sub style='font-size: smaller;'>12</sub> is 38.9g per 100g H<sub style='font-size: smaller;'>2</sub>O. What is the mass percentage of Na<sub style='font-size: smaller;'>3</sub>AsO<sub style='font-size: smaller;'>4</sub> in the saturated solution? <br/>(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 cm<sup style='font-size: smaller;'>3</sup> of 0.15 M NaOH is titrated to its end point with 39.45 cm<sup style='font-size: smaller;'>3</sup><br/>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?