JAMB Chemistry 2021 Past Questions

Practice each question, then open it to see the full details.

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
E.

The enzyme that converts glucose to ethyl alcohol is?

A.maltase
B.zymase
C.Diatase
D.Invertase
E.

The scientist who stated that matter can be converted into energy is?

A.Boyle
B.Lavoiser
C.Avogadro
D.Einstein
E.

What is the IUPAC name for the following compound? HC\(\equiv\)CCH\(_{3}\)

A.Acetylene
B.Methyl acetylene
C.Butanol
D.Decanoic acid
E.

What is the chemical name for the compound CuCO\(_{3}\)?

A.Copper (iii) carbonate
B.Copper (ii) carbonate
C.Copper (i) carbonate
D.Copper
E.

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
E.

Which one of the following is not a mixture?

A.Air
B.Mercury
C.Milk
D.Cement
E.

Which of the following is a non-metal that remains liquid at room temperature?

A.Chlorine
B.Phosphorus
C.Bromine
D.Helium
E.

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
E.

The atomic weight of nitrogen is?

A.10
B.12
C.14
D.16
E.

The gas which causes global warming is?

A.O\(_{2}\)
B.CO\(_{2}\)
C.N\(_{2}\)
D.He
E.

Oxygen is absent in?

A.Kerosene
B.Soil
C.Glass
D.Cement
E.

A sample of any of the following substances disappears after some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?

A.Sublimation
B.Evaporation
C.Diffusion
D.Radiation
E.

The maximum electron in N shell is?

A.2
B.8
C.18
D.32
E.

Neutrons were discovered by?

A.James Chadwick
B.Ernest Rutherford
C.J.J Thompson
D.John Dalton
E.

Which of the following is a form of calcium carbonate?

I. limestone
II. marble
III. chalk
Iv. egg-shells

A.I only
B.I, II and IV
C.I and II only
D.I, II, III, and IV
E.

Soaps clean surfaces on the principle based on?

A.viscosity
B.floatation
C.elasticity
D.surface tension
E.

The reactivity of fluorine is due to?

A.its high electro negativity
B.small size of fluorine atom
C.availability of D-orbitals
D.strong f-f bond
E.

The mass number of a nucleus is?

A.Always less than its atomic number
B.The sum of the number of protons and neutrons present in the nucleus
C.Always more than the atomic weight
D.A fraction
E.

The mass of one Avogadro number of helium atoms is?

A.1.00gram
B.4.00gram
C.8.00gram
D.6.00gram
E.

220g of carbon dioxide contains ----- moles

A.5
B.6
C.3
D.4
E.

The inherited traits of an organism are controlled by?

A.RNA molecules
B.Nucleotides
C.DNA molecules
D.Enzymes
E.

The most abundant rare gas in the atmosphere is?

A.He
B.Ne
C.Ar
D.Xe
E.

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
E.

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
E.

The metal used to recover copper from a solution of copper sulphate is?

A.Na
B.Ag
C.Hg
D.Fe
E.

The nucleus of an atom consists of?

A.Electrons and neutrons
B.Electrons and protons
C.Protons and neutrons
D.None of the above
E.

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%
E.

The only metal that is anti-bacterial is?

A.Iron
B.Sodium
C.Alluminium
D.Copper
E.

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
E.

A chemical process in which there is a gain of electrons is known as?

A.Sublimation
B.Reduction
C.Oxidation
D.Distillation
E.

The reactions involving simultaneous oxidation and reduction?

A.Automatic reactions
B.Alternate reactions
C.Reduction agency
D.Redox reactions
E.

A binary compound of oxygen with another element is referred to as?

A.Oxide
B.Element
C.Carbon
D.Nitrogen
E.

The process or act of extracting a metal from its ore and refining it is called?

A.Extraction
B.Metal mining
C.Mettallurgy
D.Prospecting
E.

The compounds made up of only carbon and hydrogen are called?

A.Carbon compounds
B.Hydrocarbons
C.Atoms
D.Carbon hydrolysis
E.

One of the following is not a physical property of monosaccharides?

A.Monosaccharides get charred when heated
B.Monosaccharides are water-soluble, sweet substances
C.They are highly vital to the exploration of metals
D.They can be reduced to sugar alcohols
E.

In troposphere, the two types of pollutants are?

A.Gaseous and particulate pollutants
B.Carbon and metallic pollutants
C.Natural and man-made pollutants
D.Sulphuric and nitrogenous pollutants
E.

The molar enthalpy change accompanying the removal of an electron from a gas phase atom or ion in its ground state is called?

A.Electron gain enthalpy
B.Ionization enthalpy
C.Enthalpy change
D.Enthalpic gas removal
E.

The fourteen elements (atomic number 90-103) after actinium are called?

A.Actinoids
B.Nucleotides
C.Pre-actinum elements
D.Atomic elements
E.

The process by which salt and water reacted in a limited way to form an acid or a base is?

A.Neutral process
B.Basic acidic process
C.Hydrolysis
D.Sublimation
E.