CHM291: Practical Chemistry Iii-inorganic TMA2 complete Question & Answer

CHM201 TMA 2. image

CHM291: Practical Chemistry Iii-inorganic TMA2 complete Question & Answer

Question 1 : The clear colourless solution observed when impurities are removed from aluminium beverage can include?
A.  Potassium hydroxide
B.  Potassium hydroxide and water
C.  Potassium hydroxide and aluminium hydroxide
D.  Aluminium hydroxide and water

Answers to question 1 is C.  Potassium hydroxide and aluminium hydroxide
Question 2 : A bi-dentate ligand is an organic reagent containing how many functional groups and can combine with metallic ions
A.  One functional group
B.  Multiple functional groups
C.  Two functional groups
D. Three functional groups

Answers to question 2 is C.  Two functional groups

Question 3 : The end point colour change of complexometric titration for calcium and magnesium in the presence of suitable indicator is?.?
A.  Pale-yellow
B.  Blue colour
C.  Violet colour
D.  Dark-blue colour

Answers to question 3 is C.  Violet colur

Question 4 : What is the name of the indicator used in complexometric titration between silver nitrate and sodium chloride?
A.  Phenolphthalein indicator
B.  Eriochrome black T indicator
C.  Litmus paper indicator
D.  Methyl orange indicator

Answers to question 4 is B.  Eriochrome black T indicator
Question 5 : To remove the thin plastic coating on the walls of the aluminium, the metal is dissolved in which solution?
A.  Hot water
B.  Aluminium hydroxide solution
C.  Sulphuric acid solution
D.  Potassium hydroxide solution

Answers to question 5 is D.  Potassium hydroxide solution

Question 6 : In the precipitation process of chloride ions when insufficient amount of silver nitrate is used predict what will happen to this procedure?
A.  The procedure will record a substantial error
B.  All of the above
C.  The procedure will record a substantial error
D.  There will be low percentage value for chloride in the sample

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Answers to question 6 is B.  All of the above
Question 7 : Why must we cover the product of precipitation reaction between chloride ion and silver nitrate reagent?
A.  To facilitate precipitation
B. To avoid incomplete precipitation
C.  To avoid decomposition of the silver chloride in the presence of light
D.  To make proper observation of the cloudy precipitate formation

Answers to question 7 is C.  To avoid decomposition of the silver chloride in the presence of light
Question 8 : The indicator used in determining the end point of complexometric titration in hard water analysis is called?
A.  Mordant Black II
B.  Eriochrome black T
C.  Methyl orange indicator
D.  Phenolphthalein indicator

Answers to question 8 A.  Mordant Black II

Question 9 : What is the role of EDTA in complexometric titration?
A.  It is use to mask the reagents
B.  It is an end point indicator
C.  It is a chelating agent
D.  It is catalyst

Answers to question 9 C.  It is a chelating agent

Question 10 : The chemical formula of Alum is??
Answers to question 10 is KAL(SO4)2.12H2O

 

Question 11 : What are major residual impurities that are removed from the aluminium beverage can?
A.  Plastics and hydrogen gas
B.  Paint and hydrogen gas
C.  Plastics and aluminium ions
D.  Plastics and paint

Answers to question 11 D.  Plastics and paint

 

 

Question 12 : Scaly residue upon evaporation is a characteristic of?��?.?
A.  Salty water
B.  Acid water
C.  Hard water
D.  Soft water

Answers to question 12 is C.  Hard water

Question 13 : Why are aluminium beverage cans not reactive with the beverage contents?
A.  Because the beverages are inert to aluminium
B.  Because both the beverage and the cans are stored in cold temperature
C.  Because the cans have thin plastic coating on the inside
D.  None of the above options

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Answers to question 13 is C.  Because the cans have thin plastic coating on the inside
Question 14 : What is the simple procedure for checking complete precipitation occurrence of chloride ions using silver nitrate reagent?
A.  Without stirring further, add silvernitrate until the solution turns cloudy
B.  Without stirring further, add silvernitrate until the solution remains clear
C.  Observed that a thick white cloud is formed in the solution
D.  Heat the solution until it turns clear

Answers to question 14 is B.  Without stirring further, add silvernitrate until the solution remains clear
Question 15 : One of the common differences between acid-base and complexometric titration is?..?
A.  Colour change is used to indicate the end point of the acid base titration
B.  The procedure involved in complexometric titration is more complex and time consuming
C.  Complexometric analysis are useful for determination of mixture of different ions in solution
D.  Acid-base titration are useful particularly in determining of mixture of different ions in solution

Answers to question 15 is A.  Colour change is used to indicate the end point of the acid base titration
Question 16 : The reagent used to precipitate aluminium from aluminate is ?
A.  Ammonia hydroxide
B.  Potassium hydroxide
C.  Potassium hydroxide
D.  Sulphuric acid

Answers to question 16 is D.  Sulphuric acid

Question 17 : Hard water is due to the presence of the following except
Ansnwer: try the question yourself

Question 18 : Why is cooling necessary final step of precipitation of alum crystals?
A.  Because alum crystals precipitate at room temperature
B.  Because alum crystals are not stable at room temperature
C.  Because aluminium crystals are soluble at room temperature
D.  Because alum crystals are not stable at room temperature

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Answers to question 18 is C.  Because aluminium crystals are soluble at room temperature
Question 19 : The end point colour change during complexometric titration is?.?
A.  Blue-black
B.  Pale-blue
C.  orange
D Light-red

Answers to question 19 is  B.  Pale-blue
BIO213: Chemistry Of Amino Acids And Proteins TMA4 Complete Question & Answer

Question 20 : Below are the three major requirements for a good gravimetric analysis except?.?
A.  The reagent will react only with the analytes of interest to form ionic solution
B.  The reagent forms one and only one product with the analyte
C.  The reagent forms one and only one product with the analyte
D.  The analyte precipitate quantitatively from solution above 99.99%

Answers to question 20 is A.  The reagent will react only with the analytes of interest to form ionic solution
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