(a)(i) Determine the oxidation number of sulphur in Na\(_2\)S\(_2\)O\(_3\) (ii) Name the allotropes of sulphur. (iii) State two ways in which the structure ...

Question 1 Report

(a)(i) Determine the oxidation number of sulphur in Na\(_2\)S\(_2\)O\(_3\)

(ii) Name the allotropes of sulphur.

(iii) State two ways in which the structure of graphite and diamond are similar.

 

(b)(i) Name two green-house gases.

(ii) State one effect of an increased level of green-house gases on the environment.

(iii) State one source from which nitrogen (I) oxide is released into the environment.

(iv) Write a chemical equation to show the effect of heat on each of the following compounds: I. KNO\(_{3(s)}\) II. AgNO\(_{3(s)}\)

 

(C)(i)Describe briefly how pure crystals of calcium chloride could be obtained from a solution of calcium chloride

ii) Explain briefly each of the following observations:

I. ammonia gas is highly soluble in water;

II. boiling ploint of chlorine is lower than that of iodine

 

(d) Consider the reaction represented by the following equation:- 2NaCl + H\(_2\)SO\(_{4(s)}\)  \(\to\) Na\(_2\)SO\(_{4(s)}\) + 2HCl\(_{(g)}\)

Calculate the volume of HCl gas that can be obtained at s.t.p. from 5.85 g of sodium. chloride. [ Na = 23.0, Cl = 35.5, Molar volume of gas at s.t.p. = 22.4 dm\(^3\)]