Chemistry Past Questions and Answers

Which of the following electrodes is used in electrolysis of bauxite (Al<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>3</sub>) in molten cryolite?

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