Year :
2021
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
21 - 30 of 40 Questions
| # | Question | Ans |
|---|---|---|
| 21. |
220g of carbon dioxide contains ----- moles A. 5 B. 6 C. 3 D. 4 Detailed SolutionOne mole of carbon dioxide molecules has a mass of 44.01 g,: 5 mole of carbon dioxide molecules has a mass of 220g There is an explanation video available below. |
|
| 22. |
The inherited traits of an organism are controlled by? A. RNA molecules B. Nucleotides C. DNA molecules D. Enzymes Detailed SolutionDNA now has three distinct functions—genetics, immunological, and structural—that are widely disparate and variously dependent on the sugar phosphate backbone and the bases.There is an explanation video available below. |
|
| 23. |
The most abundant rare gas in the atmosphere is? A. He B. Ne C. Ar D. Xe Detailed SolutionThe most abundant naturally occurring gas is Nitrogen (N2), which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas Argon (Ar) is the third most abundant gas.Argon is the most abundant rare gas in the atmosphere. It is represented by the symbol Ar. The atomic number of Ar is 18. There is an explanation video available below. |
|
| 24. |
The heat required to raise the temperature of the body by 1k is called? A. Specific heat B. Thermal capacity C. Water equivalent D. None of the above Detailed SolutionHeat capacity or thermal capacity: The amount of heat to be supplied to an object to produce a unit change in its temperature(1k).There is an explanation video available below. |
|
| 25. |
The nucleus of a hydrogen atom consist of a? A. 1 proton only B. 1 proton, 2 neutron C. 1 neutron only D. 1 electron only Detailed SolutionThe hydrogen atom is the simplest of all atoms: it consists of a single proton and a single electronThere is an explanation video available below. |
|
| 26. |
The metal used to recover copper from a solution of copper sulphate is? A. Na B. Ag C. Hg D. Fe Detailed SolutionThe ideal metals to use for the task of recovering copper from an aqueous solution of copper sulphate are metals that are stronger reducing agents than copper but not reactive enough to react with the water that the solution consists of.Zinc, Aluminium, Iron are relatively inexpensive and being unreactive on exposure to water. There is an explanation video available below. |
|
| 27. |
The nucleus of an atom consists of? A. Electrons and neutrons B. Electrons and protons C. Protons and neutrons D. None of the above Detailed SolutionAn atom nucleus is made up of protons and neutrons.An electron is a negatively charged subatomic particle that orbits the nucleus of an atom. There is an explanation video available below. |
|
| 28. |
A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage A. 11.% B. 22.2% C. 10% D. 20% Detailed SolutionMass of Solution = Mass of Solute + Mass of Solvent → 20g + 180g: Mass of Solution = 200g Mass Percent = \(\frac{Mass of Solute}{Mass of Solution} * 100%\) Mass percent = \(\frac{20}{200} * 100%\) Mass percent = 10% There is an explanation video available below. |
|
| 29. |
The only metal that is anti-bacterial is? A. Iron B. Sodium C. Alluminium D. Copper Detailed SolutionAluminium sulfate is a salt soluble in water and is mainly used as a coagulating agent in the purification of drinking water.Copper demonstrated the greatest antimicrobial activity. The silver coatings demonstrated the second most antimicrobial surface. There is an explanation video available below. |
|
| 30. |
An element having the atomic number 17 will resemble which of the following elements having atomic number as given below? A. 33 B. 35 C. 18 D. 19 Detailed SolutionThe Group 7 elements are called the halogens. They are placed in the vertical column, second from the right, in the periodic table .Chlorine (17), bromine(35) and iodine(53) are the first three of the Group 7 elements. There is an explanation video available below. |
| 21. |
220g of carbon dioxide contains ----- moles A. 5 B. 6 C. 3 D. 4 Detailed SolutionOne mole of carbon dioxide molecules has a mass of 44.01 g,: 5 mole of carbon dioxide molecules has a mass of 220g There is an explanation video available below. |
|
| 22. |
The inherited traits of an organism are controlled by? A. RNA molecules B. Nucleotides C. DNA molecules D. Enzymes Detailed SolutionDNA now has three distinct functions—genetics, immunological, and structural—that are widely disparate and variously dependent on the sugar phosphate backbone and the bases.There is an explanation video available below. |
|
| 23. |
The most abundant rare gas in the atmosphere is? A. He B. Ne C. Ar D. Xe Detailed SolutionThe most abundant naturally occurring gas is Nitrogen (N2), which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas Argon (Ar) is the third most abundant gas.Argon is the most abundant rare gas in the atmosphere. It is represented by the symbol Ar. The atomic number of Ar is 18. There is an explanation video available below. |
|
| 24. |
The heat required to raise the temperature of the body by 1k is called? A. Specific heat B. Thermal capacity C. Water equivalent D. None of the above Detailed SolutionHeat capacity or thermal capacity: The amount of heat to be supplied to an object to produce a unit change in its temperature(1k).There is an explanation video available below. |
|
| 25. |
The nucleus of a hydrogen atom consist of a? A. 1 proton only B. 1 proton, 2 neutron C. 1 neutron only D. 1 electron only Detailed SolutionThe hydrogen atom is the simplest of all atoms: it consists of a single proton and a single electronThere is an explanation video available below. |
| 26. |
The metal used to recover copper from a solution of copper sulphate is? A. Na B. Ag C. Hg D. Fe Detailed SolutionThe ideal metals to use for the task of recovering copper from an aqueous solution of copper sulphate are metals that are stronger reducing agents than copper but not reactive enough to react with the water that the solution consists of.Zinc, Aluminium, Iron are relatively inexpensive and being unreactive on exposure to water. There is an explanation video available below. |
|
| 27. |
The nucleus of an atom consists of? A. Electrons and neutrons B. Electrons and protons C. Protons and neutrons D. None of the above Detailed SolutionAn atom nucleus is made up of protons and neutrons.An electron is a negatively charged subatomic particle that orbits the nucleus of an atom. There is an explanation video available below. |
|
| 28. |
A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage A. 11.% B. 22.2% C. 10% D. 20% Detailed SolutionMass of Solution = Mass of Solute + Mass of Solvent → 20g + 180g: Mass of Solution = 200g Mass Percent = \(\frac{Mass of Solute}{Mass of Solution} * 100%\) Mass percent = \(\frac{20}{200} * 100%\) Mass percent = 10% There is an explanation video available below. |
|
| 29. |
The only metal that is anti-bacterial is? A. Iron B. Sodium C. Alluminium D. Copper Detailed SolutionAluminium sulfate is a salt soluble in water and is mainly used as a coagulating agent in the purification of drinking water.Copper demonstrated the greatest antimicrobial activity. The silver coatings demonstrated the second most antimicrobial surface. There is an explanation video available below. |
|
| 30. |
An element having the atomic number 17 will resemble which of the following elements having atomic number as given below? A. 33 B. 35 C. 18 D. 19 Detailed SolutionThe Group 7 elements are called the halogens. They are placed in the vertical column, second from the right, in the periodic table .Chlorine (17), bromine(35) and iodine(53) are the first three of the Group 7 elements. There is an explanation video available below. |