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Question 1 Chemistry 2018 | WAEC/GCE (2018)
A
Ethene 
B
Methane 
C
Sulphur 
D
Hydrogen 
Explanation.
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Ethene is the most important organic chemical, by weight, that is manufactured. It is an important raw material for the production of plastics and antifreeze solutions as well as solvents.


Correct Option:
A
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Question 2 Chemistry 2018 | WAEC/GCE (2018)
A
Pentane 
B
Benzene 
C
Propane 
D
Hexane 
Explanation.
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An example of benzene addition reaction is the formation of cyclohexane by a mix of benzene vapour and hydrogen passed over nickel catalyst; while chlorobenzene is formed by substitution reaction.


Correct Option:
B
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Question 3 Chemistry 2018 | WAEC/GCE (2018)
A
\(HNO_{{3}{(aq)}} + NaOH_{(aq)} \to NaNO_{{3}{(aq)}} + H_{2}O_{(l)}\) 
B
\(AgNO_{{3}{(aq)}}+KCl_{(aq)} \to AgCl_{(s)}+KNO_{{3}{(aq)}}\) 
C
\(CaCO_{{3}{(s)}} \to CaO_{(s)} + CO_{{2}{(g)}}\) 
D
\(2H_{2}S_{(s)} + SO_{{2}{(g)}} \to 2HO_{2} + 3S_{(g)}\) 
Explanation.
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No official Explanation yet!


Correct Option:
D
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Question 4 Chemistry 2018 | WAEC/GCE (2018)
A
decomposition 
B
oxidation 
C
reduction 
D
sublimation 
Explanation.
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The Iron is to to be gotten by the removal of oxygen from its ore, and this is called a reduction reaction.


Correct Option:
C
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Question 5 Chemistry 2018 | WAEC/GCE (2018)
A
0.08\(gdm^{-3}\) 
B
2.00\(gdm^{-3}\) 
C
8.00\(gdm^{-3}\) 
D
80.00\(gdm^{-3}\) 
Explanation.
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1000\(cm^{3}\) = 1\(dm^{3}\)

200\(cm^{3}\) = 0.2\(dm^{3}\)

⇒ 0.2\(dm^{3}\) contains 0.4g

hence, solubility of the salt which is the amount of the salt dissolvable in 1\(dm^{3}\) is

\(\frac{0.4g}{0.2dm^{3}} = 2.0gdm^{-3}\)


Correct Option:
B
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Question 6 Chemistry 2018 | WAEC/GCE (2018)
A
double anions in its aqueous solution 
B
a single cation in its aqueous solution 
C
hydrogen ions in its aqueous solution 
D
hydrogen atoms in its aqueous solution 
Explanation.
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Acid salts are salts whose aqueous solutions are acidic in character, implying that their aqueous solutions possess hydrogen ions.


Correct Option:
C
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Question 7 Chemistry 2018 | WAEC/GCE (2018)
A
reaction vessel feels cool during the reaction 
B
enthalpy change is negative 
C
bond forming energy exceeds bond breaking energy 
D
heat of formation of reactants exceeds heat of formation of products 
Explanation.
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Endothermic reactions absorb heat from their surroundings during the reaction process. This means that in the course of the reaction the vessel being used in the reaction will be cool in the process.


Correct Option:
A
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Question 8 Chemistry 2018 | WAEC/GCE (2018)
A
CH\(_{4}\) 
B
HCl 
C
NH\(_{3}\) 
D
NaH 
Explanation.
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The bonding between a non-metal and a metal is an ionic bonding. In metal hydrides, Hydrogen takes on the ionic charge of -1, hence forming an ionic bond with the metals.


Correct Option:
D
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Question 9 Chemistry 2018 | WAEC/GCE (2018)
A
\(C_{2}H_{4}\) 
B
\(C_{3}H_{4}\) 
C
\(C_{3}H_{6}\) 
D
\(C_{4}H_{8}\) 
Explanation.
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Given the molecular formula, \(CH_{2}\).

The empirical formula will be \((CH_{2})n\)= 42

\((12+(2\times1))n =42\)

⇒ \(14n =42\)

n = 3, hence the empirical formula is \(C_{3}H_{6}\)


Correct Option:
C
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Question 10 Chemistry 2018 | WAEC/GCE (2018)
A
an oxidizing agent 
B
a reducing agent 
C
an acid 
D
a base 
Explanation.
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No official Explanation yet!


Correct Option:
A
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