Surface Chemist...

An uncatalyzed reaction' s progress diagram is shown by solid line. Which of two dotted lines represents the same reaction in the presence of catalyst?

A catalyst:

A catalyzed reaction mechanism has a ____ activation energy and thus, causes a _____ reaction rate.

A catalyst :

Statement I: Above reaction is exothermic.
Because
Statement II: Energy difference B is greater than energy difference A.

Recorded data: 
Before$$:$$ $$CuO+$$porcelain boat$$=62.869$$g
$$CaCl_2+$$U-tube$$=80.483$$g
After:Porcelain boat$$+$$contents $$=54.869$$g
$$CaCl_2+$$U-tube$$=89.483$$g
Reactions:$$Zn(s)+2HCl(aq)\rightarrow ZnCl_2(aq)+H_2(g)$$ then $$H_2(g)+CuO(s)\rightarrow H_2O(g)+Cu(s)$$
What was the reason placing tube of $$CaCl_2$$ between the generator and the tube containing the porcelain boat?

After observing the graph, which statement tells that the chemical reaction is exothermic?

Which of the following pairs of colloidal solutions have dispersed phase as liquid and dispersed medium as gas?