(a)(i) Draw the energy profile diagram for the reaction

H\(_{2(g)}\) + I\(_{2(g)}\) ---> 2HI\(_{(g)}\)   \(\Delta\) = —13 kJmol\(^3\)

(ii) If the concentration of HI increases from 0 to 0.001 mol dm\(^3}\) in 50 seconds, what is the rate of the reaction?

 

(b) State the type of salt represented by each of the following compounds:

(i) K\(_4\)Fe(CN)\(_6\) (ii) (NH\(_4\))\(_2\)Fe(SO\(_4\))\(_2\)6H\(_2\)O (iii) Mg(OH)NO\(_3\) (iv) NaH\(_2\)PO\(_4\).

 

(c) Explain, giving equations, the following observation: When carbon (IV) oxide is passed into lime water, it turns milky initially but turns clear with excess carbon (IV) oxide.

 

(d)(i) Give one use for each of the following compounds: CaCO\(_3\), CaSO\(_4\), NaHCO\(_3\).

 

(ii) State a drying agent for each of the following gases: i. NH\(_3\), II. HCI Ill. SO\(_4\).

 

(iii) Write an equation to illustrate the reaction of ammonia as a reducing agent.

 

(e) An industrial raw material has the following composition by mass:

Iron = 28.1%

Chlorine = 35.7%

Water of crystallization = 36.2%

Calculate the formula for the material. [ H = 1, 0 = 16, Cl = 35.5, Fe = 56 ].