Year :
2000
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
31 - 40 of 45 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
Which of the following procedures is suitable for identifying the food colouring added to a pastry sample? A. carry out some food tests B. examine the pastry sample under a microscope C. Do a chromotogram of the colouring extract D. determine the molar mass of the colouring |
C |
| 32. |
C8H18 will undergo the following reactions except A. cracking B. combustion C. substitution D. addition |
D |
| 33. |
Which of the following is correct about both compounds show below? CH3CH 2CH2OH;CH 3 A. They have identical physical properties B. They are structural isomers C. Their general molecular formula is the same D. They are oxidized to alkanones |
C |
| 34. |
Which of the following needs to be hydrolysed before it shows reducing property? A. Glucose B. Maltose C. Sucrose D. Fructose |
C |
| 35. |
Two-organic substances are labelled K and L if K gave a blue-black colour with iodine solution and L gave a deep red precipitate with Million's reagent, it can be concluded that A. K is a carbhydrate and L is a protein B. K is alkaline and L is acidic C. K is unsaturated and L is a reducing sugar D. K is a reducing agent and L is an amino acid |
A |
| 36. |
A colourless, odourless liquid T, gives effervesce with sodium trioxocarbonate (IV) and a white precipitate with silver trioxonitrate (V) solution T is mose probably A. sodium chloride soluttion B. barium chloride solution C. dilute trioxonitrate (V) acid D. dilute hydroxide is unstable |
C |
| 37. |
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate fromed redissolves in excess sodium hydroxide because A. sodium is more reactive than zinc B. sodium hydroxide is a strong alkali C. zinc hydroxide is amphoteric D. zinc hydroxide is unstable |
C |
| 38. |
Which of the following on burning in air contributes to acid rain? A. Sulphur B. Magnesium C. Aluminium D. Zinc |
A |
| 39. |
If 20 cm3 of distilled water is added to 80 cm3 of 0.50 mol dm-3 hydrochloric acid, the concentration of the acid will change to A. 20 mol dm-3 B. 0.40 mol dm-3 C. 2.00 mol dm-3 D. 5.00 mol dm -3 Detailed SolutionFrom M1V1 = M 2V2; m 1 = 0.50 mol dm-3; m2 = ?; v1 = 80cm 3 = 100cm3 :. m2 = m1v2/v2 = 0.50 x 80/100 = 0.40 mol dm-3 |
|
| 40. |
Biotechnology is applied in the following except A. baking industry B. wine production C. production of antibiotics D. manufacture of soap |
D |
| 31. |
Which of the following procedures is suitable for identifying the food colouring added to a pastry sample? A. carry out some food tests B. examine the pastry sample under a microscope C. Do a chromotogram of the colouring extract D. determine the molar mass of the colouring |
C |
| 32. |
C8H18 will undergo the following reactions except A. cracking B. combustion C. substitution D. addition |
D |
| 33. |
Which of the following is correct about both compounds show below? CH3CH 2CH2OH;CH 3 A. They have identical physical properties B. They are structural isomers C. Their general molecular formula is the same D. They are oxidized to alkanones |
C |
| 34. |
Which of the following needs to be hydrolysed before it shows reducing property? A. Glucose B. Maltose C. Sucrose D. Fructose |
C |
| 35. |
Two-organic substances are labelled K and L if K gave a blue-black colour with iodine solution and L gave a deep red precipitate with Million's reagent, it can be concluded that A. K is a carbhydrate and L is a protein B. K is alkaline and L is acidic C. K is unsaturated and L is a reducing sugar D. K is a reducing agent and L is an amino acid |
A |
| 36. |
A colourless, odourless liquid T, gives effervesce with sodium trioxocarbonate (IV) and a white precipitate with silver trioxonitrate (V) solution T is mose probably A. sodium chloride soluttion B. barium chloride solution C. dilute trioxonitrate (V) acid D. dilute hydroxide is unstable |
C |
| 37. |
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate fromed redissolves in excess sodium hydroxide because A. sodium is more reactive than zinc B. sodium hydroxide is a strong alkali C. zinc hydroxide is amphoteric D. zinc hydroxide is unstable |
C |
| 38. |
Which of the following on burning in air contributes to acid rain? A. Sulphur B. Magnesium C. Aluminium D. Zinc |
A |
| 39. |
If 20 cm3 of distilled water is added to 80 cm3 of 0.50 mol dm-3 hydrochloric acid, the concentration of the acid will change to A. 20 mol dm-3 B. 0.40 mol dm-3 C. 2.00 mol dm-3 D. 5.00 mol dm -3 Detailed SolutionFrom M1V1 = M 2V2; m 1 = 0.50 mol dm-3; m2 = ?; v1 = 80cm 3 = 100cm3 :. m2 = m1v2/v2 = 0.50 x 80/100 = 0.40 mol dm-3 |
|
| 40. |
Biotechnology is applied in the following except A. baking industry B. wine production C. production of antibiotics D. manufacture of soap |
D |