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1996 WAEC Chemistry Practical Mention one suitable laboratory procedure for (i) removing carbon (IV) oxide from a sample of air...

Chemistry
WAEC 1996

Mention one suitable laboratory procedure for

(i) removing carbon (IV) oxide from a sample of air

(ii) determining whether a given sample of water is pure or not;

(iii) concentrating a dilute solution of sodium chloride.

 

(b) Use the information provided in the table below to outline a suitable procedure for separating a mixture containing P, Q and R into its Components.

Component  Solubility in tetrachloromethane Solubility in water

P

Q

R

Insoluble 

Soluble

Insoluble 

Insoluble 

Slightly soluble 

soluble 

 

(c)(i) Draw a labelled sketch to illustrate the collection of gases by upward displacement of air.

(ii) A gas S, with a rotten egg smell, was evolved when dilute hydrochloric acid was added to T which is a salt of iron (II). S decolorized acidified potassium tetraoxomanganate (VIl) solution and a yellow precipitate V was also obtained. Identify S, T and V.

(iii) State what would be observed on bubbling chlorine through a solution of potassium bromide.

 

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Explanation

(a)(i) Pass/ bubble air through caustic soda (NaOH) or caustic potash (KOH) lime water.

(ii) Determine its boiling point/ freezing point.

(iii) Heat/warm/ boil to evaporate off some of the water.

 

(b) Add CCl\(_4\), Q dissolves. Filter off solution of Q add water to the residue, R dissolves. Then filter and obtain P as residue

 

(c)(i) Labelling of gas jar and delivery tube are the two major components.

Open Photo

 

(ii) S is H\(_2\)S; T is FeS; V is sulphur 

(iii) Brown/Reddish brown coloration. 


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