Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.
The acidic hydrogen in the compound is the hydrogen attached to carbon number
A5
B4
C3
D1
View Explanation & Discuss
Question 2
jamb1988
Carbon (ll) oxide may be collected as shown above because
Ais heavier than air
Bis less dense than air
Cis insoluble in water
Dburns in oxygen to form carbon (IV) oxide
View Explanation & Discuss
Question 3
jamb1988
The IUPAC name for
A2-methylbutanoic acid
B2-methyl-1- hydroxyketone
C2-methyl-1-hydroxy aldehyde
D2-methylpentanoic acid
View Explanation & Discuss
Question 4
jamb1988
The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by
Al
Bll
Clll
DlV
View Explanation & Discuss
Question 5
jamb1988
Use the graph above to answer this question. The mass of a substance, M, liberated at an electrode during electrolysis is proportional to the quantity of electricity, Q passing through the electrolyte. This is represented graphically by.
AA
BB
CC
DD
View Explanation & Discuss
Question 6
jamb1988
Which of the gas laws does the above graph illustrate?
ABoyle
BCharles
CGraham
DGay-Lussac
View Explanation & Discuss
Question 7
jamb1988
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
Aevaporation
Brecrystallization
Csublimation
Dfractional precipitation
View Explanation & Discuss
Question 8
jamb1988
An eruption pollution an environment with gas suspected to be H2S, a poisonous gas. A residue team should spray the environment with?
Awater
Bmoist SO2
Cacidified KMnO4 and water
Dwater, acidified KMnO4 and oxygen
View Explanation & Discuss
Question 9
jamb1988
The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?
Anitrogen is less soluble than oxygen
Boxygen is heavier than nitrogen
Cnitrogen has a higher partial pressure in air
Dgases are hydrated in water
View Explanation & Discuss
Question 10
jamb1988
The energy changes accompanying the addition of an electron to a gaseous atom is called?
Afirst ionization energy
Bsecond ionization energy
Celectron affinity
Delectronegativity
View Explanation & Discuss
Question 11
jamb1988
What are the possible oxidation numbers of an element if its atomic number is 17?
A-1 and 7
B-1 and 6
C-3 and 5
D-2 and 6
View Explanation & Discuss
Question 12
jamb1988
Which of the following physical properties decreases across the Periodic Table?
AIonization potenial
BElectron affinity
CElectronegativity
DAtomic radius
View Explanation & Discuss
Question 13
jamb1988
A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?
A20
B18
C16
D2
View Explanation & Discuss
Question 14
jamb1988
The forces holding naphthalene crystals together can be overcome when naphthalene is heated to a temperature of 354K resulting in the crystal to melting. These forces are known as?
Acoulombic
Bionic
Ccovalent
DVan der waals
View Explanation & Discuss
Question 15
jamb1988
An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?
Aaverage velocity of the molecules
Bnumber of collisions between the molecules
Cdensity of the molecules
Dfree mean path between each molecules and other
View Explanation & Discuss
Question 16
jamb1988
One mole of propane is mixed with five moles of oxygen. The mixture is ignited and the propane burns completely. What is the volume of the products at s.t.p?
(G.M.V = 22.4 dm3 mol-1)
A112.0 dm3
B67.2 dm3
C56.0 dm3
D44.8 dm3
View Explanation & Discuss
Question 17
jamb1988
2.25g of a sample of an oxide of copper on reduction gave 2.0g of copper. 2.50g of another oxide of copper on reduction also gave 2.0g of copper. These results are in accordance with the law of?
Aconstant composition
Bconservation of matter
Cmultiple proportions
Ddefinite proportions
View Explanation & Discuss
Question 18
jamb1988
The formula of a compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is~?
AMX
BM3X4
CM4X3
DM3X2
View Explanation & Discuss
Question 19
jamb1988
What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
