1997 - WAEC Chemistry Past Questions and Answers - page 5
41
Element X, with electronic configuration 2, 8, 2 and element Y with electronic configuration 2, 8, 7 are like to combine by
A
metallic bonding
B
covalent bonding
C
electrovalent bonding
D
dative bonding
correct option: c
Users' Answers & Comments42
The valence electrons of element 12Mg are in the
A
1s orbital
B
2s orbital
C
2px orbital
D
2py orbital
correct option: e
Users' Answers & Comments43
Which of the following statements is correct about sodium chloride in the solid state?
A
it exists as aggregates of ions
B
it conducts electricity
C
its melting point is below 100oC
D
it exists as discrete molecules
correct option: d
Users' Answers & Comments44
Which of the following Group 1 elements has the highest ionization energy?
A
55Cs
B
37Rb
C
19K
D
11Na
correct option: e
Users' Answers & Comments45
Boyle's law can be expressed mathematically as
A
V \(\alpha\) T (P constant)
B
P \(\alpha\) V (T constant)
C
P \(\alpha\) T
D
V \(\alpha\) 1 / p(T constant)
correct option: d
Users' Answers & Comments46
What volume of oxygen at s.t.p would react with carbon to form 4.40g of CO2 according to the following equation? C(s) + O2(g) → CO2(g) [O = 16; C =12; 1 mole of a gas occupies 22.4dm3 at s.t.p]
A
0.224dm3
B
2.24dm3
C
4.40dm3
D
4.48dm3
correct option: b
From the equation, C + O2 → CO2 : 22.dm3 of oxygen is required to form 44g of CO2 the volume of O2 required to produce 4.4gm is x, :. x = 44/44 X 22.4dm3
Users' Answers & Comments47
A mixture of NaCI(s) and CaCO3(s) is best separated by
A
dissolution followed by filtration
B
sublimation followed by crystallization
C
dissolution followed by evaporation
D
dissolution followed by crystallization
correct option: a
Users' Answers & Comments48
What is the basicity of the acid in the followed reaction? NaCO + 2CHCOOH → 2CH COONa + H2O + CO2
A
1
B
2
C
3
D
4
correct option: a
Users' Answers & Comments