In the schematic diagram for the preparation of hydrogen gas as shown in figure, what would happen if following changes are made ? (a) In place of zinc granules, same amount of zinc dust is taken in the test tube. (b) Instead of dilute sulphuric acid, dilute hydrochloric acid is taken. (c) Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.

In the schematic diagram for the preparation of hydrogen gas as shown

1.	In the schematic diagram for the preparation of hydrogen gas as shown in figure, what would happen if following changes are made ? (a) In place of zinc granules, same amount of zinc dust is taken in the test tube. (b) Instead of dilute sulphuric acid, dilute hydrochloric acid is taken. (c) Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.
Answer» Solution :(a) Hydrogen gas would evolve at a greater speed because zinc dust provides more surface area for the reaction as COMPARED to granulated zinc. (b) Almost same volume of gas would evolve. (c) Hydrogen gas would evolve UPON heating the TUBE. `Zn(s) + 2NaOH(aq) to underset("Sod. zincate")(Na_(2)ZnO_(2)(aq)) + H_(2)(G)`