Question

Is there any change in tem when zinc granules are added to dilute hcl or sulphuric acid

Answer 1

Nope, there is no change of temperature. Hydrogen is evolved and is collected by downward displacement of water.

Answer 2

When Zinc granules are added to dil. HCl:

Zn + 2HCl ----> ZnCl2 + H2

ZnCl2 is formed which is white in color.

When Zinc granules are added to dil. H2SO4:

Zn + H2SO4 ----> ZnSO4 + H2

Which is grayish in color.

In both the cases the reaction mixture will become hot and temperature will rise due to a vigorous displacement reaction in both the cases...