(a)(i) Explain what is meant by acid anhydride and give one example

(ii) State three chemical properties of hydrochloric acid.

 

(b) Explain each of the following observations:

(i) Tetraoxosulphate (VI) acid can form two types of salts unlike trioxonitrate (V) acid.

(ii) Copper and iron react with concentrated H\(_2\)SO\(_4\) but only one of them reacts with the dilute acid.

(iii) On adding dilute H\(_2\)SO\(_4\) separately to zinc dust and zinc granules of the same mass, the dust produced more vigorous effervescence.

 

(c)(i) Define activation energy.

(ii) Sketch and label an energy profile diagram for the following reaction: A + B --> C + D; AH = xkJmol\(^{-1}\)

(iii) Explain why the heat of reaction of the mineral acids with sodium hydroxide is constant in value.

 

(d) Consider the reaction represented by the following equation:

Q\(_{(s)}\) \(\rightleftharpoons\) Q\(_{(l)}\) \(\Delta\)  = xkJmol\(^{-1}\)

(i) State with reason which of Q\(_{(s)}\) and O\(_{(J)}\) has the higher entropy.

(ii) What will be the effect of decrease in temperature on the system at equilibrium?