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 these cell notations is the correct representation of a Daniell cell?
AZn(s) / Zn2+(aq) // Cu2+(aq)/Cu(s)
BCu(s) / CU2+(aq) // Zn2+(aq) / Zn(s)
CZn2+(aq) / Zn(s) // Cu2+(aq) /Cu(s)
DCu2+(aq) / Cu(s) // Zn(s) / Zn2+(aq)
View Explanation & Discuss
Question 1052
waec2007
Consider the reaction represented by the following equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ∆H = - 92kJmol1. Finely divided iron is used as catalyst in the reaction in order to
Alower the value of ∆H
Bincrease the time for attainment of equilibrium
Cshorten the time for attainment of equilibrium
Ddecrease the yield of ammonia
View Explanation & Discuss
Question 1053
waec2007
A solution of a salt X reacts with AgNO3 solution to give white precipitate which dissolves in excess aqueous ammonia. X contains
ACI-
BPb 2+
CSO 2-
DZn2+
View Explanation & Discuss
Question 1054
waec2007
What process is illustrated below? S(s) ⇌H2O⇌ S (aq)
ADecomposition of a solid
BMelting of a solid
CFormation of saturated solution of a solid
DSublimation of a solid
View Explanation & Discuss
Question 1055
waec2007
Which of the following compounds is a basic salt?
AMg(NO3)2
B(NH4)2SO4
CK4Fe(CN)6
DZn(OH)CI
View Explanation & Discuss
Question 1056
waec2007
Consider the reaction represented by the equation: Ca(OH)2(aq) + CO 2(g) → CaCO3(s) + H 2O(l)
in the reaction above, CO 2 acts as
Aan acidic oxide
Ban oxidizing agent
Ca basic oxide
Da dehydrating agent
View Explanation & Discuss
Question 1057
waec2007
In which of the following compound (s) will heat be absorbed on adding water?
l. KNO\(_3\) II. Concentrated H\(_2\)SO\(_4\) III. NH\(_4\)CI
AI only
Blll only
Cl and lll only
Dll and lll only
View Explanation & Discuss
Question 1058
waec2007
Which of the following statements is true of the molecules of a gas under ideal conditions? The molecules
Amove at random
Bundergo inelastic collisions
Cattract each other
Doccupy a large volume
View Explanation & Discuss
Question 1059
waec2007
Which of the following gases is light than air?
ACO2
BSO2
CHCI
DNH3
View Explanation & Discuss
Question 1060
waec2007
When air is successively passed through sodium hydroxide solution, alkaline pyrogallol and then concentrated tetraoxosulphate (VI) acid, its remaining components are
Aoxygen and water vapour
Boxygen and nitrogen
Ccarbon (IV) acid and noble gases
Dnitrogen and noble gases
View Explanation & Discuss
Question 1061
waec2007
What is the IUPAC name of the compound represented by the molecular formula NaCIO4?
ASodium tetraoxochlorate (l)
BSodium tetraoxochlorate (IV)
CSodium tetraoxochlorate (VI)
DSodium tetraoxochlorate(VII)
View Explanation & Discuss
Question 1062
waec2007
How many atoms are there in one mole of hydrogen gas? [Avogadro's c x 1023mol-1]
A1.2 x 10 23
B6.0 x 10 23
C1.2 x10 24
D6.0 x 10 24
View Explanation & Discuss
Question 1063
waec2007
14.8 g of a salt (z)dissolved in 250 cm3 of distilled water gives a concentration of 0.80 mol dm-3. Calculate the molar mass of the salt (z).
A13.5 g mol-1
B18.5 g mol-1
C47.4 g mol-1
D74.0 g mol-1
View Explanation & Discuss
Question 1064
waec2007
Which of the following species does not contain a co-ordinate bond?
AAI2CI6
BCCI4
CH3O+
DNH +4
View Explanation & Discuss
Question 1065
waec2007
Which of the following compounds has hydrogen bonds between its molecules?
AHF
BHBr
CHCI
DHI.
View Explanation & Discuss
Question 1066
waec2007
If the difference between the electronegativities of two elements is large, the type of bond that can be formed between them is
Acovalent
Bdative
Cionic
Dmetallic
View Explanation & Discuss
Question 1067
waec2007
Which of the following statements about sodium is not true?
ANa+ is smaller in size than Na
BNa is smaller in size than Na+
CNa+ has fewer electrons than Na
DThe effective nuclear charge in Na+ is greater than in Na
View Explanation & Discuss
Question 1068
waec2007
Which of the following properties of atoms generally increases down a group in the periodic table?
AElectron affinity
BElectronegativity
CIonic radius
Dlonization energy
View Explanation & Discuss
Question 1069
waec2007
A transition metal would be expected to
Afrom oxides with different formulae
Bhave strong oxidizing ability
Chave low density
Dhave an atomic structure with an incomplete outermost shell
View Explanation & Discuss
Question 1070
waec2007
In which of the following atoms is the ionic radius larger than the atomic radius? [11 Na, 12Mg,13AI,17CI]
