All your burette readings (initials and final), as well as the size of your pipette, must be recorded but no account of experimental procedure is required. All calculations must be done in your answer booklet.

(a) State what would be observed when \(BaCl_2\) solution is a portion of a saturated Na\(_2\)CO\(_2\) followed by dilute HCI in excess.

(ii) A gas Q decolorized acidified kMnO\(_4\) Solution. Suggest what Q could be

(b) Name one substance used in the laboratory for drying each of the following substances:

(i) ammonia gas:

(ii) carbon (IV) oxide. 

(c) Give a reason why a given mass of sodium hydroxide pellets cannot be used to prepare a standard solution. 

All your burette readings (initials and final) as well as the size of your pipette must he recorded but no account of experimental procedure is required. All calculations must be done in your booklet.

A solution of potassium tetraoxomanganate( VII). B is a solution of iron(II)chloride containing 4.80g of the salt in 250 cm\(^{3}\) of solution.

(a) Put A into the burette. Pipette 20.0cm\(^3\) or 2.50.0 of B into a conical flask, add 20.0 cm\(^3\) of H\(_2\)SO4\(_{(aq)}\) and titrate with A. Repeat the titration to obtain concordant titre values. Tabulate your results and calculate the average volume of A used. The equation of the reaction is: MnO\(_{4(aq)}\) +  5Fe\(^{3+}_{ (aq)}\) + H\(_2\))

(b) From your results and the information provided, calculate the;

 (i) concentration of B moldm\(^{-3}\):

(ii) concentration of A in moldm\(^{-3}\)

(iii) number of moles of Fe\(^{2+}\) in the volume of B pipetted. [FeCl\(_2\) = 127 gmol\(^{-1}\)] Credit will be given for strict adherence to the instruction, for observations precisely recorded and for accurate inferences. AlI tests, Observations and inferences must be clearly entered in the booklet in ink at the time they are made.

All your burette readings (initials and final) as well as the size of your pipette must be recorded but no account of experimental procedure is required. All calculations must be done in your booklet.

C and D are inorganic salts. Carry out the following exercises on them. Record your observations and identify any gas(es) evolved. State the conclusions you draw from the result of each test.

(a) Put all of C in a test tube and add about 5 cm of distilled water. Shake thoroughly and test the resulting solution with Litmus paper. Divide the solution into three portions.

(i) To the first portion, add NaOH\(_{(aq)}\) in drops, then in excess.

(ii) To the second portion. add NH\(_{3(aq)}\) in drops. then in excess.

(iii) To the third portion. add AgNO\(_{3 (aq)}\) followed by HCl\(_{(aq)}\)

 (b)(i) Put all of D in a test tube and add about 5 cm\(^3\) of distilled water. Shakę thoroughly and feel the test tube.

(ii) To about 2 cm\(^3\) of the solution, add HCl\(_{(aq)}\)

All your burette readings (initials and final) as well as the size of your pipette must he recorded but no account of experimental procedure is required. All calculations must be done in your booklet.

State the observation that would be made when each of the following reactions is carried out in the laboratory:

(a) Addition of 2 cm\(^3\) of bench H\(_2\)SO\(_{4(aq)}\) to 2 cm\(^{3}\) of barium chloride solution;

(b) Addition of 2 cm\(^3\) of dilute hydrochloric acid to 1g of powered iron(II) sulphide (FeS):

(C) Addition of 2 cm\(^3\) of dilute hydrochloric acid to 1g of iron filings and allowed to stand for sometime. 

All your burette readings (initials and final), as well as the size of your pipette, must be recorded but no account of experimental procedure is required. All calculations must be done in your answer booklet.

State what would be observed if the following reactions are carried out in the laboratory:

(i) methyl orange is dropped into a solution of lime juice:

(ii) hydrogen sulphide gas is bubbled through Iron (III) chloride solution:

(iii) sulphur (IV) oxide gas is bubbled into acidified solution of KMnO\(_4\):

(iv) ethanoic acid is added to a solution of Ka\(_2\)CO\(_3\)