Question

In the following schematic diagram form the preapratinn of hydrogen gas as shown in the figure what would happen if the following chnges are made? ltbvrgt
(a) In plae of zinc granules , same amount of zinc dust is taken in the test tube
(b) Instead of dilute suplhuric acid , dilute hydrochloric acid is taken.
(c ) In place of zinc, copper turnings are taken
(d) Sodium hydroxide is taken in place of dilute suphuric acid and the tube is heated.

Answer 1

(a) If same amount of zinc dust is taken in the btest tube then the reaction will be comparatively faster and hydrogen gas will evolve with greater speed. It is because zinc dust has larger surface area than zinc granules
(b) with dilute hydrochloric acid almost same amoutn of gas is evolved.
(c ) with copper turning s hydrogen gas will not evolve because copper is less reactive os it does no react with dil `H_(2)SO_(4)` or dil .HCI Hence no rection will take place
(d) Zinc also reat with NaOH. So if sodium hydroxide is taken then hydrogen gas will be evolved
`Zn+2NaOHrarrNa_(2)ZnO_(2)+H_(2)uparrow`