Chemistry Past Questions and Answers

An aqueous solution of a metal salt, M, gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia. Therefore cartion in M is

At S. T. P how many litres of hydrogen can be obtained from the reaction of 500 cm<sup style='font-size: smaller;'>3</sup> of 0.5 M H <sub style='font-size: smaller;'>2</sub>SO <sub style='font-size: smaller;'>4</sub> with excess zinc metal?<br/>(Gram molecular volume of H<sub style='font-size: smaller;'>2</sub> = 22. 4 dm <sup style='font-size: smaller;'>3</sup>)

The solubility curves of four substances are shown in the figure above. Which of the four substances would crystallize from a saturated solution cooled from 353K(80<sup style='font-size: smaller;'>o</sup>C)to 323K(50[sup][/sup]C)?

Which of the curves shown in the figure given represents the relationships between the volume(V) and pressure(P) of an ideal gas at constant temperature

The diagram above (Fig.3) shows the energy profile for the reaction A + B + = C + D From this diagram, it is clear that the reaction is