Chemistry Past Questions and Answers

You are provided with five gas jars containing SO<sub style='font-size: smaller;'>2</sub>, CO<sub style='font-size: smaller;'>2</sub>, H<sub style='font-size: smaller;'>2</sub>, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely

Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?

200cm<sup style='font-size: smaller;'>3</sup> each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.<br/>[Pb = 207, Cl= 35.5, N = 14, O = 16]

56.00cm<sup style='font-size: smaller;'>3</sup> of a gas at S.T.P. weighed 0.11g. What is the vapour density of the gas?<br/>[Molar volume of a gas at S.T.P = 22.4dm<sup style='font-size: smaller;'>3</sup>

Which of the following gases will diffuse fastest when passed through a porous plug?<br/>[H = 1, C = 12, N = 14, O = 16]