Year :
2012
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
31 - 40 of 44 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
The hydrolysis of NH\(_4\)CI gives A. an acidic solution B. an alkaline solution C. a buffer solution D. a neutral solution Detailed SolutionWhen you dissolve ammonium chloride crystals in water (H\(_2\)O), the ammonium chloride compound decomposes into its component ions: NH\(_4 ^+\) and Cl\(^-\). The reaction of these ions with water gives an acidic solution. |
|
| 32. |
A spot of oil paint on a shirt can best be removed using A. brine B. detergent C. kerosine D. warm water |
C |
| 33. |
Consider the reaction represented by the following equation: CuO\(_{(s)}\) + H\(_2\)SO\(_{4(aq)}\) → CuSO\(_{4(aq)}\) + H\(_2\)O\(_{(l)}\). Which of the following factors will not affect the rate of the reaction? A. Particle size of CuO(s) B. Concentration of H2SO4(aq) C. Temperature of the reacting mixture D. Pressure of reaction system Detailed SolutionThe reaction rate between a solid and liquid will not be affected by pressure. Pressure majorly affects the reaction rate for gases. |
|
| 34. |
Which of the following devices function on redox reaction? l. Dry cell ll. Car battery III. Electric generator A. l and lll only B. ll and lll only C. l and ll only D. l, ll and lll |
C |
| 35. |
The oxidation number of Fe in [Fe(CN)\(_6\)]\(^{3-}\) is A. +3 B. +2 C. -2 D. -3 Detailed SolutionLet the oxidation number of Fe in the compound [Fe(CN)\(_6\)]\(^{3-}\) be x.x + 6(-1) = -3 x - 6 = -3; x = -3 + 6 x = +3 |
|
| 36. |
Consider the following reaction equation: C\(_{16}\)H\(_{34}\) → C\(_5\)H\(_{12}\) + C\(_{11}\)H\(_{22}\). The process represented by the equation is A. cracking B. fermentation C. polymerization D. reforming Detailed SolutionIn the reaction, a complex hydrocarbon is broken down into two simpler hydrocarbons. This is cracking. |
|
| 37. |
Which of the following substances would not produce ethanol when fermented? A. Cane sugar B. Glucose C. Starch D. Vinegar Detailed SolutionVinegar is a product from fermentation. It can be gotten from the fermentation of ethanol. |
|
| 38. |
An alkanol can be prepared by the reaction of an alkene with A. concentrated tetraoxosulphate (VI) acid B. bromine tetrachloroethane C. aqueous potassium tetraoxomanganate (VII) D. sodium hydroxide solution Detailed SolutionAn alkene reacts with conc. H\(_2\)SO\(_4\) to yield an alkyl hydrogen tetraoxosulphate (VI). The compound formed undergoes hydrolysis when boiled with water to yield an alcohol. |
|
| 39. |
A tertiary alkanol has a molecular formula C\(_4\)H\(_{10}\)O. What is the structural formula of the compound? A. (CH 3)2CHCH2OH B. CH3CH2CH(OH)CH3 C. (CH3)3COH D. CH3CH2CH2CH2OH |
C |
| 40. |
Which of the following industrial processes depends on the action of enzymes? A. Liquefaction of air B. Manufacture of soap C. Brewing of beer D. Catalytic cracking Detailed SolutionThe brewing of beer has to do with fermentation. |
| 31. |
The hydrolysis of NH\(_4\)CI gives A. an acidic solution B. an alkaline solution C. a buffer solution D. a neutral solution Detailed SolutionWhen you dissolve ammonium chloride crystals in water (H\(_2\)O), the ammonium chloride compound decomposes into its component ions: NH\(_4 ^+\) and Cl\(^-\). The reaction of these ions with water gives an acidic solution. |
|
| 32. |
A spot of oil paint on a shirt can best be removed using A. brine B. detergent C. kerosine D. warm water |
C |
| 33. |
Consider the reaction represented by the following equation: CuO\(_{(s)}\) + H\(_2\)SO\(_{4(aq)}\) → CuSO\(_{4(aq)}\) + H\(_2\)O\(_{(l)}\). Which of the following factors will not affect the rate of the reaction? A. Particle size of CuO(s) B. Concentration of H2SO4(aq) C. Temperature of the reacting mixture D. Pressure of reaction system Detailed SolutionThe reaction rate between a solid and liquid will not be affected by pressure. Pressure majorly affects the reaction rate for gases. |
|
| 34. |
Which of the following devices function on redox reaction? l. Dry cell ll. Car battery III. Electric generator A. l and lll only B. ll and lll only C. l and ll only D. l, ll and lll |
C |
| 35. |
The oxidation number of Fe in [Fe(CN)\(_6\)]\(^{3-}\) is A. +3 B. +2 C. -2 D. -3 Detailed SolutionLet the oxidation number of Fe in the compound [Fe(CN)\(_6\)]\(^{3-}\) be x.x + 6(-1) = -3 x - 6 = -3; x = -3 + 6 x = +3 |
| 36. |
Consider the following reaction equation: C\(_{16}\)H\(_{34}\) → C\(_5\)H\(_{12}\) + C\(_{11}\)H\(_{22}\). The process represented by the equation is A. cracking B. fermentation C. polymerization D. reforming Detailed SolutionIn the reaction, a complex hydrocarbon is broken down into two simpler hydrocarbons. This is cracking. |
|
| 37. |
Which of the following substances would not produce ethanol when fermented? A. Cane sugar B. Glucose C. Starch D. Vinegar Detailed SolutionVinegar is a product from fermentation. It can be gotten from the fermentation of ethanol. |
|
| 38. |
An alkanol can be prepared by the reaction of an alkene with A. concentrated tetraoxosulphate (VI) acid B. bromine tetrachloroethane C. aqueous potassium tetraoxomanganate (VII) D. sodium hydroxide solution Detailed SolutionAn alkene reacts with conc. H\(_2\)SO\(_4\) to yield an alkyl hydrogen tetraoxosulphate (VI). The compound formed undergoes hydrolysis when boiled with water to yield an alcohol. |
|
| 39. |
A tertiary alkanol has a molecular formula C\(_4\)H\(_{10}\)O. What is the structural formula of the compound? A. (CH 3)2CHCH2OH B. CH3CH2CH(OH)CH3 C. (CH3)3COH D. CH3CH2CH2CH2OH |
C |
| 40. |
Which of the following industrial processes depends on the action of enzymes? A. Liquefaction of air B. Manufacture of soap C. Brewing of beer D. Catalytic cracking Detailed SolutionThe brewing of beer has to do with fermentation. |