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

(N/A) Hydrogen gas will evolve with greater speed because zinc dust has a larger surface area compared to zinc granules,which increases the rate of reaction.
$(b)$ Almost the same amount of hydrogen gas will be evolved as both are strong mineral acids.
$(c)$ Hydrogen gas will not be evolved because copper is less reactive than hydrogen and cannot displace it from the acid.
$(d)$ If sodium hydroxide is taken,hydrogen gas will be evolved upon heating:
$Zn + 2NaOH \to Na_2ZnO_2 + H_2$ (Sodium zincate is formed along with hydrogen gas).