Chemistry, 2021, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

2021

Title :

Chemistry

Exam :

JAMB Exam

Paper 1 | Objectives

1 - 10 of 40 Questions

#	Question	Ans
1.	Give the common name for the following compound (CH\(_{3}\))\(_{2}\) CH CH\(_{2}\) -Br A. Isobutyl bromide B. Methyl bromide C. propyl bromide D. Butyl bromide Show Content Detailed Solution Common name : Isobutyl bromide IUPAC name : 1-Bromo-2-methylpropane Boiling point : 102°C Formula : C\(_4\)H\(_9\)Br There is an explanation video available below.	A
2.	The enzyme that converts glucose to ethyl alcohol is? A. maltase B. zymase C. Diatase D. Invertase Show Content Detailed Solution Zymase is an enzyme complex that catalyzes the fermentation of sugar into ethanol and carbon dioxide. It occurs naturally in yeasts. There is an explanation video available below.	B
3.	The scientist who stated that matter can be converted into energy is? A. Boyle B. Lavoiser C. Avogadro D. Einstein Show Content Detailed Solution The principle described by the physicist Albert Einstein's famous formula: E = mc^2, involves mass–energy equivalence. I.e. the relationship between mass and energy. There is an explanation video available below.	D
4.	What is the IUPAC name for the following compound? HC\(\equiv\)CCH\(_{3}\) A. Acetylene B. Methyl acetylene C. Butanol D. Decanoic acid Show Content Detailed Solution Propyne (methylacetylene) is an alkyne with the chemical formula HC\(\equiv\)CCH\(_{3}\) There is an explanation video available below.	B
5.	What is the chemical name for the compound CuCO\(_{3}\)? A. Copper (iii) carbonate B. Copper (ii) carbonate C. Copper (i) carbonate D. Copper Show Content Detailed Solution Copper(II) carbonate or cupric carbonate is a chemical compound with formula CuCO\(_{3}\) There is an explanation video available below.	B
6.	A 'breath test' used by traffic police to check drunken driving uses? A. Tumeric on filter paper B. Silica gel coated with saliva nitrate C. Potassium permanganate-sulphuric acid D. Potassium dichromatic-sulphuric acid Show Content Detailed Solution The earliest developed breathalyzer was based on reaction of alcohol if present in the exhaled air with a cocktail of chemicals containing sulfuric acid, potassium dichromate, silver nitrate, and water. Silver nitrate catalyzes the reaction between alcohol and potassium dichromate in acidic medium. There is an explanation video available below.	D
7.	Which one of the following is not a mixture? A. Air B. Mercury C. Milk D. Cement Show Content Detailed Solution A mixture is a material made up of two or more different chemical substances which are not chemically combined. Mercury is a chemical element with the symbol Hg and atomic number 80. There is an explanation video available below.	B
8.	Which of the following is a non-metal that remains liquid at room temperature? A. Chlorine B. Phosphorus C. Bromine D. Helium Show Content Detailed Solution Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest halogen and is a volatile red-brown liquid at room temperature that evaporates readily to form a similarly coloured vapour. There is an explanation video available below.	C
9.	Which of the following are chemical changes? I. cooking of food II. digestion of food III. freezing of water IV. water is heated up A. I and II B. I, II, and III C. III and IV D. all of the above Show Content Detailed Solution There is an explanation video available below.	A
10.	The atomic weight of nitrogen is? A. 10 B. 12 C. 14 D. 16 Show Content Detailed Solution Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element's atoms to some standard. There is an explanation video available below.	C

1.	Give the common name for the following compound (CH\(_{3}\))\(_{2}\) CH CH\(_{2}\) -Br A. Isobutyl bromide B. Methyl bromide C. propyl bromide D. Butyl bromide Show Content Detailed Solution Common name : Isobutyl bromide IUPAC name : 1-Bromo-2-methylpropane Boiling point : 102°C Formula : C\(_4\)H\(_9\)Br There is an explanation video available below.	A
2.	The enzyme that converts glucose to ethyl alcohol is? A. maltase B. zymase C. Diatase D. Invertase Show Content Detailed Solution Zymase is an enzyme complex that catalyzes the fermentation of sugar into ethanol and carbon dioxide. It occurs naturally in yeasts. There is an explanation video available below.	B
3.	The scientist who stated that matter can be converted into energy is? A. Boyle B. Lavoiser C. Avogadro D. Einstein Show Content Detailed Solution The principle described by the physicist Albert Einstein's famous formula: E = mc^2, involves mass–energy equivalence. I.e. the relationship between mass and energy. There is an explanation video available below.	D
4.	What is the IUPAC name for the following compound? HC\(\equiv\)CCH\(_{3}\) A. Acetylene B. Methyl acetylene C. Butanol D. Decanoic acid Show Content Detailed Solution Propyne (methylacetylene) is an alkyne with the chemical formula HC\(\equiv\)CCH\(_{3}\) There is an explanation video available below.	B
5.	What is the chemical name for the compound CuCO\(_{3}\)? A. Copper (iii) carbonate B. Copper (ii) carbonate C. Copper (i) carbonate D. Copper Show Content Detailed Solution Copper(II) carbonate or cupric carbonate is a chemical compound with formula CuCO\(_{3}\) There is an explanation video available below.	B

6.	A 'breath test' used by traffic police to check drunken driving uses? A. Tumeric on filter paper B. Silica gel coated with saliva nitrate C. Potassium permanganate-sulphuric acid D. Potassium dichromatic-sulphuric acid Show Content Detailed Solution The earliest developed breathalyzer was based on reaction of alcohol if present in the exhaled air with a cocktail of chemicals containing sulfuric acid, potassium dichromate, silver nitrate, and water. Silver nitrate catalyzes the reaction between alcohol and potassium dichromate in acidic medium. There is an explanation video available below.	D
7.	Which one of the following is not a mixture? A. Air B. Mercury C. Milk D. Cement Show Content Detailed Solution A mixture is a material made up of two or more different chemical substances which are not chemically combined. Mercury is a chemical element with the symbol Hg and atomic number 80. There is an explanation video available below.	B
8.	Which of the following is a non-metal that remains liquid at room temperature? A. Chlorine B. Phosphorus C. Bromine D. Helium Show Content Detailed Solution Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest halogen and is a volatile red-brown liquid at room temperature that evaporates readily to form a similarly coloured vapour. There is an explanation video available below.	C
9.	Which of the following are chemical changes? I. cooking of food II. digestion of food III. freezing of water IV. water is heated up A. I and II B. I, II, and III C. III and IV D. all of the above Show Content Detailed Solution There is an explanation video available below.	A
10.	The atomic weight of nitrogen is? A. 10 B. 12 C. 14 D. 16 Show Content Detailed Solution Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element's atoms to some standard. There is an explanation video available below.	C