Year :
2010
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
1 - 10 of 49 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
Which of the following is an example of a mixture? A. Common salt B. Blood C. Sand D. Washing soda Detailed SolutionThe Blood is a mixture which consists of water, proteins, fats, oil, sugar, vitamins, hormones, enzymes,e\ etcThere is an explanation video available below. |
|
| 2. |
Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V) A. 8.5% B. 13.1% C. 17.1% D. 27.6% |
|
| 3. |
The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the? A. water vapour in the air around the bottle gains some energy from the bottle B. temperature of the milk drops as it loses heat into the surroundings C. saturated vapour pressure of the milk is equal to the atmospheric pressure D. water vapour in the air around the bottle loses some of its energy to the bottle |
|
| 4. |
The volume of a given gas is V cm3 P mm Hg. what is the new volume of the gas if the pressure is reduced to half at constant temperature? A. 4 V cm3 B. 2 V cm3 C. V/2 cm3 D. V cm3 |
|
| 5. |
Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the? A. decrease in nuclear charge B. increase in nuclear charge C. decrease in screening effect D. increase in screening effect |
|
| 6. |
How many unpaired electron(s) are there in the nitrogen sub-levels? A. 3 B. 2 C. 1 D. none |
|
| 7. |
The stability of the noble gases is due to the fact that they? A. have no electron in their outermost shells B. have duplet or octet electron configurations C. belong to group zero of the periodic table D. are volatile in nature Detailed SolutionNoble / Rare gases belong to group 0 because they have no bonding electrons in their outermost shell to satisfy the octet rule for stability.There is an explanation video available below. |
|
| 8. |
The maximum number of electrons in the L shell of an atom is? A. 2 B. 8 C. 18 D. 32 Detailed SolutionThe maximum number of electrons present in a particular shell is calculated by the formula 2n2, where “n” represents the shell number. For instance, K shell is the first shell and it can hold up to 2(1)2 = 2 electrons. Similarly, L shell is the second shell and it can hold up to 2(2)2 = 8 electrons.There is an explanation video available below. |
|
| 9. |
Elements in the same period in the periodic table have the same? A. number of shells B. atomic number C. chemical properties D. physical properties Detailed SolutionElements within the same group have the same number of electrons in their valence (outermost) shells, and they have similar electron configurations. They exhibit similar chemical propertiesThere is an explanation video available below. |
|
| 10. |
12D + 13T → 24He + 01n + energy A. alpha decay B. artificial transmutation C. nuclear fussion D. nuclear fission |
| 1. |
Which of the following is an example of a mixture? A. Common salt B. Blood C. Sand D. Washing soda Detailed SolutionThe Blood is a mixture which consists of water, proteins, fats, oil, sugar, vitamins, hormones, enzymes,e\ etcThere is an explanation video available below. |
|
| 2. |
Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V) A. 8.5% B. 13.1% C. 17.1% D. 27.6% |
|
| 3. |
The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the? A. water vapour in the air around the bottle gains some energy from the bottle B. temperature of the milk drops as it loses heat into the surroundings C. saturated vapour pressure of the milk is equal to the atmospheric pressure D. water vapour in the air around the bottle loses some of its energy to the bottle |
|
| 4. |
The volume of a given gas is V cm3 P mm Hg. what is the new volume of the gas if the pressure is reduced to half at constant temperature? A. 4 V cm3 B. 2 V cm3 C. V/2 cm3 D. V cm3 |
|
| 5. |
Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the? A. decrease in nuclear charge B. increase in nuclear charge C. decrease in screening effect D. increase in screening effect |
| 6. |
How many unpaired electron(s) are there in the nitrogen sub-levels? A. 3 B. 2 C. 1 D. none |
|
| 7. |
The stability of the noble gases is due to the fact that they? A. have no electron in their outermost shells B. have duplet or octet electron configurations C. belong to group zero of the periodic table D. are volatile in nature Detailed SolutionNoble / Rare gases belong to group 0 because they have no bonding electrons in their outermost shell to satisfy the octet rule for stability.There is an explanation video available below. |
|
| 8. |
The maximum number of electrons in the L shell of an atom is? A. 2 B. 8 C. 18 D. 32 Detailed SolutionThe maximum number of electrons present in a particular shell is calculated by the formula 2n2, where “n” represents the shell number. For instance, K shell is the first shell and it can hold up to 2(1)2 = 2 electrons. Similarly, L shell is the second shell and it can hold up to 2(2)2 = 8 electrons.There is an explanation video available below. |
|
| 9. |
Elements in the same period in the periodic table have the same? A. number of shells B. atomic number C. chemical properties D. physical properties Detailed SolutionElements within the same group have the same number of electrons in their valence (outermost) shells, and they have similar electron configurations. They exhibit similar chemical propertiesThere is an explanation video available below. |
|
| 10. |
12D + 13T → 24He + 01n + energy A. alpha decay B. artificial transmutation C. nuclear fussion D. nuclear fission |