Year :
1998
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
21 - 30 of 38 Questions
| # | Question | Ans |
|---|---|---|
| 21. |
2X(g) + Y(g) → Z(g): In the equation above, The rate of formation of Z is found to be independent of the concentration of Y and to quadruple when the concentration of X is doubled. The correct equation for the reaction is? A. R = k (X)(Y) B. R = K (X) ° (Y) C. R = K (X) ° (Y) 2 D. R = K (X) 2(Y)° |
D |
| 22. |
A gas that turns a filter paper previously soaked in lead ethanoate solution black is? A. hyrogen chloride B. hydrogen sulphide C. sulphur (IV) oxide D. sulphur (VI) oxide |
B |
| 23. |
3CuO(s) + 2NH3(g) → 3Cu(s) + 3H2O(I) N2(g) (i). A. basic properties of ammonia B. acidic properties of ammonia C. reducing properties of ammonia D. oxidizing properties of ammonia |
C |
| 24. |
A solution containing chloride ions gives white precipitate with silver trioxonitrate(V) Solution. The precipitate will be insoluble in dilute? A. HNO 3 but soluble in ammonia solution B. HNO3 and ammonia solution C. HCl but soluble in ammonia solution D. HCl and in ammonia solution |
A |
| 25. |
The oxide that remains unchanged when heated in hydrogen is? A. CuO B. Fe2O3 C. PbO2 D. ZnO |
B |
| 26. |
Which of the following is observed when a solution of iron (III) chloride is mixed with a solution of sodium hydroxide? A. A gas is evolved B. A deep blue precipitate is formed C. The resultant solution turns green turns D. A brown precipitate is formed Detailed Solutioniron(III) chloride is a yellow solutionsodium hydroxide is colourless iron(III) hydroxide is a reddish brown precipitate sodium chloride is colourless So in the reaction, yellow solution when added to sodium hydroxide forms reddish brown precipitate that is insoluble in excess sodium hydroxide. |
|
| 27. |
The metal that will react with water only in the form of steam to librate hydrogen gas is? A. calcium B. aluminium C. iron D. zinc |
C |
| 28. |
A common characteristic shared by iron and aluminium is that both? A. are extracted by reduction methods B. form only basic oxides C. show oxidation states of +2 and +3 D. form soluble hydroxides |
A |
| 29. |
Alloys are often used in preference to pure metals because? A. metals are too hard B. merals are ductile C. metallic properties are improve in alloys D. alloys are a mixture of metals |
C |
| 30. |
One mole of hydrocarbon contains 6g of hydrogen. If the molecular weight is 54, the hydrocarbon is an? A. alkanone B. alkane C. alkene D. alkyne Detailed SolutionCxH6∴ CxH6 = 54 12x + 6 = 54 12x = 54 - 6 12x = 48 x = (48)/(12) x = 4 We have CxH6 butyne A formular of alkyne |
| 21. |
2X(g) + Y(g) → Z(g): In the equation above, The rate of formation of Z is found to be independent of the concentration of Y and to quadruple when the concentration of X is doubled. The correct equation for the reaction is? A. R = k (X)(Y) B. R = K (X) ° (Y) C. R = K (X) ° (Y) 2 D. R = K (X) 2(Y)° |
D |
| 22. |
A gas that turns a filter paper previously soaked in lead ethanoate solution black is? A. hyrogen chloride B. hydrogen sulphide C. sulphur (IV) oxide D. sulphur (VI) oxide |
B |
| 23. |
3CuO(s) + 2NH3(g) → 3Cu(s) + 3H2O(I) N2(g) (i). A. basic properties of ammonia B. acidic properties of ammonia C. reducing properties of ammonia D. oxidizing properties of ammonia |
C |
| 24. |
A solution containing chloride ions gives white precipitate with silver trioxonitrate(V) Solution. The precipitate will be insoluble in dilute? A. HNO 3 but soluble in ammonia solution B. HNO3 and ammonia solution C. HCl but soluble in ammonia solution D. HCl and in ammonia solution |
A |
| 25. |
The oxide that remains unchanged when heated in hydrogen is? A. CuO B. Fe2O3 C. PbO2 D. ZnO |
B |
| 26. |
Which of the following is observed when a solution of iron (III) chloride is mixed with a solution of sodium hydroxide? A. A gas is evolved B. A deep blue precipitate is formed C. The resultant solution turns green turns D. A brown precipitate is formed Detailed Solutioniron(III) chloride is a yellow solutionsodium hydroxide is colourless iron(III) hydroxide is a reddish brown precipitate sodium chloride is colourless So in the reaction, yellow solution when added to sodium hydroxide forms reddish brown precipitate that is insoluble in excess sodium hydroxide. |
|
| 27. |
The metal that will react with water only in the form of steam to librate hydrogen gas is? A. calcium B. aluminium C. iron D. zinc |
C |
| 28. |
A common characteristic shared by iron and aluminium is that both? A. are extracted by reduction methods B. form only basic oxides C. show oxidation states of +2 and +3 D. form soluble hydroxides |
A |
| 29. |
Alloys are often used in preference to pure metals because? A. metals are too hard B. merals are ductile C. metallic properties are improve in alloys D. alloys are a mixture of metals |
C |
| 30. |
One mole of hydrocarbon contains 6g of hydrogen. If the molecular weight is 54, the hydrocarbon is an? A. alkanone B. alkane C. alkene D. alkyne Detailed SolutionCxH6∴ CxH6 = 54 12x + 6 = 54 12x = 54 - 6 12x = 48 x = (48)/(12) x = 4 We have CxH6 butyne A formular of alkyne |