Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
Classification of alkanols is based on the
number of carbon atoms present in the compound
molecular mass of the compound
molecular formula of the compound
number of alkyl groups bonded to the carbon having the hydroxyl group
Correct answer is D
Alkanols can be classified as primary, secondary or tertiary, according to the number of alkyl groups attached to the carbon which bears the -OH group.
6.40g
0.67g
0.64g
0.45g
Correct answer is B
\(Cu^{2+} + 2e^{-} \to Cu_{(s)}\)
\( 2 \times 96500C = 193000C deposits 64g of Cu\)
\(M \propto It\)
\(Q = It = 0.45A \times 1hr15mins\)
= \( 0.45 \times 75 \times 60\) [converting the time to seconds]
Quantity of electricity passed = 2025C
\(193000C \to 64g Cu\)
\(1C \to \frac{64}{193000}\)
\(2025C \to \frac{64}{193000} \times 2025\)
\(= 0.6715g \approxeq 0.67g\)
Which of the following factors characterize members of the same homologous series?
The chemical property change gradually throughout the series
physical properties of members are similar
They have the same molecular formular
Successive members undergo changes in molecular formula by \(CH_{2}\)
Correct answer is D
The difference between every successive member of the same homologous series is always \(CH_{2}\) eg methane is \(CH_{4}\) and ethane is \(C_{2}H_{6}\), difference being \(CH_{2}\).
+2 to 0
+2 to -2
+2 to +4
+4 to +2
Correct answer is C
In NO, the oxidation number for nitrogen is N - 2 = 0
⇒ N = +2
In \(NO_{2}\), we have N - (2x2) =0
N - 4 =0
N =+4
The common feature of reactions at the anode is that
electrons are consumed
ions are reduced
oxidation is involved
the electrode dissolves
Correct answer is C
In both the electrochemical cell and the electrolytic cell, at the anode, oxidation is involved.