Year :
1986
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
41 - 47 of 47 Questions
| # | Question | Ans |
|---|---|---|
| 41. |
10cm3 of hydrogen fluoride gas react with 5cm3 of dinitrogen difluoride gas (N2F2) to form 103 of a single gas. Which of the following is the most likely equation of the reaction? A. HF + N2F2 \(\to\) N2HF3 B. 2HF + N2F2 \(\to\) 2NHF2 C. 2HF + N2F2 \(\to\) N2H2F3 D. HF + 2N2F2 \(\to\) N4HF2 |
B |
| 42. |
The number of atoms of chlorine present in 5.85g of NaCl is [Avogaro's Number = 6.02 x 1023] A. 6.02 x 1022 B. 5.85 x 1023 C. 6.02 x 1023 D. 5.85 x 1024 Detailed SolutionThe number of atoms of chloride present in 5.85g of NaCl is 5.85 x 6.0 x 1023= 6.02 x 1022 |
|
| 43. |
How much of magnesium is required to react with 260cm3 of 0.5 M HCl? [Mg = 24] A. 0.3g B. 1.5g C. 2.4g D. 3.0g |
B |
| 44. |
The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation A. U = (kM)\(\frac{1}{2}\) B. U = (kM)2 C. U = \(\sqrt{\frac{k}{m}}\) D. U = \(\frac{k}{m}\) Detailed SolutionThe relationship between (U) of a gas molecule and the relative molecular mass is \(\bar{U}\) = (\(\frac{k}{m}\))\(^{\frac{1}{2}}\)or \(\bar{U}\) = \(\sqrt{\frac{k}{m}}\) |
|
| 45. |
An element with atomic number twelve is likely to be A. electrovalent with a velocity of 1 B. electrovalent with a valency of 2 C. covalent with a valency of 2 D. covalent with valency of 4 |
B |
| 46. |
Which of the following groups of physical properties increases from left to right of the periodic table?i. Ionization energy ii. Atomic radius iii. Electronegativity iv. Electron affinity A. i and ii B. i, ii and iii C. iii and iv D. i, iii and iv Detailed SolutionAtomic radius is the distance from the atom's nucleus to the outer edge of the electron cloud. In general, atomic radius decreases across a period and increases down a group. |
|
| 47. |
When 50cm3 of a saturated solution of sugar (molar mass 342.0g) at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is A. 10.0 moles dm-3 B. 7.0 moles dm-3 C. 3.5 moles dm-3 D. 2.0 moles dm-3 |
D |
| 41. |
10cm3 of hydrogen fluoride gas react with 5cm3 of dinitrogen difluoride gas (N2F2) to form 103 of a single gas. Which of the following is the most likely equation of the reaction? A. HF + N2F2 \(\to\) N2HF3 B. 2HF + N2F2 \(\to\) 2NHF2 C. 2HF + N2F2 \(\to\) N2H2F3 D. HF + 2N2F2 \(\to\) N4HF2 |
B |
| 42. |
The number of atoms of chlorine present in 5.85g of NaCl is [Avogaro's Number = 6.02 x 1023] A. 6.02 x 1022 B. 5.85 x 1023 C. 6.02 x 1023 D. 5.85 x 1024 Detailed SolutionThe number of atoms of chloride present in 5.85g of NaCl is 5.85 x 6.0 x 1023= 6.02 x 1022 |
|
| 43. |
How much of magnesium is required to react with 260cm3 of 0.5 M HCl? [Mg = 24] A. 0.3g B. 1.5g C. 2.4g D. 3.0g |
B |
| 44. |
The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation A. U = (kM)\(\frac{1}{2}\) B. U = (kM)2 C. U = \(\sqrt{\frac{k}{m}}\) D. U = \(\frac{k}{m}\) Detailed SolutionThe relationship between (U) of a gas molecule and the relative molecular mass is \(\bar{U}\) = (\(\frac{k}{m}\))\(^{\frac{1}{2}}\)or \(\bar{U}\) = \(\sqrt{\frac{k}{m}}\) |
| 45. |
An element with atomic number twelve is likely to be A. electrovalent with a velocity of 1 B. electrovalent with a valency of 2 C. covalent with a valency of 2 D. covalent with valency of 4 |
B |
| 46. |
Which of the following groups of physical properties increases from left to right of the periodic table?i. Ionization energy ii. Atomic radius iii. Electronegativity iv. Electron affinity A. i and ii B. i, ii and iii C. iii and iv D. i, iii and iv Detailed SolutionAtomic radius is the distance from the atom's nucleus to the outer edge of the electron cloud. In general, atomic radius decreases across a period and increases down a group. |
|
| 47. |
When 50cm3 of a saturated solution of sugar (molar mass 342.0g) at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is A. 10.0 moles dm-3 B. 7.0 moles dm-3 C. 3.5 moles dm-3 D. 2.0 moles dm-3 |
D |