Write two observations for the following chemical reaction:
$(a)$ Dilute sulphuric acid is poured over zinc granules.

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(N/A) The chemical reaction is: $Zn(s) + H_2SO_4(aq) \longrightarrow ZnSO_4(aq) + H_2(g) \uparrow$
Observations:
$(i)$ Evolution of hydrogen gas bubbles is observed.
$(ii)$ The reaction is exothermic,so the temperature of the reaction vessel increases.

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