Year :
1999
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
31 - 40 of 49 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
A pair of compounds that can be used to generate a gas which has physiological effect on human beings is A. sodium trioxonitrate (V) and calcium chloride B. sodium dioxonitrate (III) and ammonium chloride C. sodium trioxonitrate (V) and ammonium chloride D. sodium dioxonitrate (III) and potassium chloride Detailed SolutionThe reaction between NaNO\(_3\) and NH\(_4\)Cl gives NaCl and NH\(_4\)NO\(_3\).Upon heating, NH\(_4\)NO\(_3\) yields 2 moles of H\(_2\)O and N\(_2\)O. |
|
| 32. |
Hydrogen is used in oxy-hydrogen flames for melting metals because it A. evolves a lot of heat when burnt B. combines explosively with oxygen C. is a very light gas D. is a rocket fuel |
A |
| 33. |
What properties of duralumin make it more useful than its constituent metals? A. It is heavy with a high melting point B. It is malleable and has high density C. It is strong and light D. It is hard and ductile |
C |
| 34. |
The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is A. magnesium and zinc B. magnesium and calcium C. copper and zinc D. lead and calcium |
B |
| 35. |
A metal that can be extracted from cassitertite is A. cacium B. magnesium C. tin D. copper |
C |
| 36. |
Which of the following metals is passive to concentrated trioxonitrate (V) acid? A. Iron B. Tin C. Copper D. Zinc |
A |
| 37. |
The hydrocarbon that burns in air with a sooty flames is A. C2H6 B. C3H8 C. C4H10 D. C6H6 |
D |
| 38. |
2-methylprop-1-ene is an isomer of A. but-2-ene B. pent-1-ene C. 2-methylbut-2-ene D. 2-methylbut-1-ene |
A |
| 39. |
Which of the following is a solvent for perfumes? A. C5H12 B. C4H6 C. CH3COOH D. C2H5OH |
D |
| 40. |
When excess ethanol is heated to 145oC in the presence of concentrated H2SO4, the product is A. ethyne B. diethyl sulphate C. diethyl ether D. acetone |
C |
| 31. |
A pair of compounds that can be used to generate a gas which has physiological effect on human beings is A. sodium trioxonitrate (V) and calcium chloride B. sodium dioxonitrate (III) and ammonium chloride C. sodium trioxonitrate (V) and ammonium chloride D. sodium dioxonitrate (III) and potassium chloride Detailed SolutionThe reaction between NaNO\(_3\) and NH\(_4\)Cl gives NaCl and NH\(_4\)NO\(_3\).Upon heating, NH\(_4\)NO\(_3\) yields 2 moles of H\(_2\)O and N\(_2\)O. |
|
| 32. |
Hydrogen is used in oxy-hydrogen flames for melting metals because it A. evolves a lot of heat when burnt B. combines explosively with oxygen C. is a very light gas D. is a rocket fuel |
A |
| 33. |
What properties of duralumin make it more useful than its constituent metals? A. It is heavy with a high melting point B. It is malleable and has high density C. It is strong and light D. It is hard and ductile |
C |
| 34. |
The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is A. magnesium and zinc B. magnesium and calcium C. copper and zinc D. lead and calcium |
B |
| 35. |
A metal that can be extracted from cassitertite is A. cacium B. magnesium C. tin D. copper |
C |
| 36. |
Which of the following metals is passive to concentrated trioxonitrate (V) acid? A. Iron B. Tin C. Copper D. Zinc |
A |
| 37. |
The hydrocarbon that burns in air with a sooty flames is A. C2H6 B. C3H8 C. C4H10 D. C6H6 |
D |
| 38. |
2-methylprop-1-ene is an isomer of A. but-2-ene B. pent-1-ene C. 2-methylbut-2-ene D. 2-methylbut-1-ene |
A |
| 39. |
Which of the following is a solvent for perfumes? A. C5H12 B. C4H6 C. CH3COOH D. C2H5OH |
D |
| 40. |
When excess ethanol is heated to 145oC in the presence of concentrated H2SO4, the product is A. ethyne B. diethyl sulphate C. diethyl ether D. acetone |
C |