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.
Which of the following noble gases has electronic structure similar to that of N in NH\(_3\)? [\(^{14}_7\)N]
A2He
B10Ne
C18Ar
D36Kr
View Explanation & Discuss
Question 2
waec2009
Which of the following elements exhibits the same chemical properties as the atom \(\frac{35}{17}\)X? An element with
Aatomic number 17
Batomic number 18
Cmass number 35
Dmass number 52
View Explanation & Discuss
Question 3
waec2009
An important medical use of nuclear radiations is
Aactivation analysis
Bcarbon dating
Cradiotherapy
Dtissue regeneration
View Explanation & Discuss
Question 4
waec2009
The electron configuration of carbon atom in its excited state is [ 6C]
A1s22s 22px12py 1
B1s 2 2s 22px 22pyo
C1s12s22px12py12pz1
D1s 22s12px12py12pz1
View Explanation & Discuss
Question 5
waec2009
The electron configuration of carbon atom in its excited state is [ 6C]
A1s22s 22px12py 1
B1s 2 2s 22px 22pyo
C1s12s22px12py12pz1
D1s 22s12px12py12pz1
View Explanation & Discuss
Question 6
waec2009
Which of the following alloys does not contain copper? l. Brass II. Bronze III. Steel
Al only
Bll only
Clll only
Dll and lll only
View Explanation & Discuss
Question 7
waec2009
The major product in the solvay process is
ANaOH
BNa 2CO 3
CNH 3
DH 2SO4
View Explanation & Discuss
Question 8
waec2009
A consequence of global warming is
Aair pollution
Bflooding
Cincreased humidity
Dlow rainfall
View Explanation & Discuss
Question 9
waec2009
Dry hydrogen chloride when dissolved in methylbenzene
Aturns blue litmus paper red
Bturns red litmus paper blue
Cdoes not affect litmus paper
Dbleaches litmus paper
View Explanation & Discuss
Question 10
waec2009
Ethanol reacts with excess acidified K2Cr 2O7 to produce
Aethanal
Bethane
Cethanoic acid
Dethylethanoate
View Explanation & Discuss
Question 11
waec2009
What is the product of the reaction between propene and 1 mole of hydrogen iodide?
ACH3CHICH3
BCH 3CH2CHI2
CCH 3CH 2CI3
DCH 3CHICH2I
View Explanation & Discuss
Question 12
waec2009
What is the molecular formula of a compound with empirical CH2O and vapour density of 90? [H = 1, C = 12, O = 16]
AC4H8O 2
BC4H 8O3
CC6H10C5
DC6H12O6
View Explanation & Discuss
Question 13
waec2009
When protein is heated to a high temperature it undergoes
Acondensation
Bdenaturation
Chydrolysis
Dpolymerization
View Explanation & Discuss
Question 14
waec2009
The product of the reaction between C\(_2\)H\(_5\)OH and concentrated H\(_2\)SO\(_4\) at 170\(^0\)C is
A(C2H5)2SO4
BCH 3CH 2HSO 4
C(C2H5)2O
DCH2 = CH 2
View Explanation & Discuss
Question 15
waec2009
Which of the following raw materials is used in the plastic industry ?
ACalcium
BEthene
CHydrogen
DMethane
View Explanation & Discuss
Question 16
waec2009
The separation of petroleum fractions depends on the differences in their
Aboiling points
Bmolar masses
Cmelting point
Dsolubilities
View Explanation & Discuss
Question 17
waec2009
Which of the following oxides of nitrogen has oxidation number of + 1?
AKNO3
BN2O
CN2O3
DNO
View Explanation & Discuss
Question 18
waec2009
Consider the reaction represented by the equation: 2H2SO 4(aq0 + C(s) → 2H2O(l) + 2SO2(g) + CO 2(g) H2SO 4 is acting as
Aa catalyst
Ban oxidizing agent
Ca reducing agent
Da sulphonating agent
View Explanation & Discuss
Question 19
waec2009
Which of the following substances is the anode in the dry Leclanche cell ?
ACarbon rod
BMuslin bag
CThe seal
DZinc container
View Explanation & Discuss
Question 20
waec2009
Which of the following factors will affect the rate of the reaction represented by the equation? 2HCI(aq) + CaCO 3(s) → CaCI2(aq) + H2O (I) + CO2(g) l. Pressure ll. Concentration III. Nature of reactants IV. Temperature
