Which of the following gases could be collected by downward displacement of air?
Answer
(B)
Hydrogen
2
Which of the following substances has the lowest boiling point?
Answer
(C)
Tetrachloromethane
3
The branch of science that deals with the nature and properties of substances and how one substance can be converted to another is known as
Answer
(B)
chemistry
4
The electron configuration 1S\(^2\) 2S\(^2\) 2P\(_x\)\(^2\) contravenes the
Answer
(D)
Hund's rule
5
The oxidation number of Chromium in Na\(_2\)Cr\(_2\)O\(_7\) is
Answer
(B)
+6
6
The most important ore of aluminium is
Answer
(A)
bauxite
7
Bases normally
Answer
(C)
turn litmus paper from red to blue
8
The product formed when concentrated sodium chloride solution is electrolysed using carbon electrodes is
Answer
(C)
sodium hydroxide
9
The product of the reaction between ethanol and excess acidified K\(_2\)Cr\(_2\)O\(_7\) is
Answer
(C)
CH\(_3\)COOH
10
Which of the following statements about ammonium salt is correct? It
Answer
(B)
dissolves in water to form solution of pH < 7
11
Ethanedioic acid is an organic solid that can be purified by
Answer
(C)
crystallization
12
Which of the following functional groups is present in alkanoic acid?
Answer
(A)
-COOH
13
In ethanol, the attractive forces between adjacent molecules are
Answer
(C)
hydrogen bonding and Van der Waal's forces
14
At 25\(^0\)C, the saturated solution of a salt in water was found to contain 0.24g of the salt in 100cm\(^3\). What is the solubility of the salt in gdm\(^{-1}\)?
Answer
(C)
2.40
15
The reaction represented by the equation: Ni\(^{2+}\)\((_{aq}\)) + Fe\((_s\)) → Ni\((_s\)) + Fe\(^{2+}\)\((_{aq}\)) is a redox reaction because
Answer
(D)
Ni\(^{2+}\) ions are reduced and Fe acts as a reducing agent.
16
Which of the following statements describes transition elements? They
Answer
(C)
possess variable oxidation state
17
Aluminium is suitable for making alloys for aircraft construction because it
Answer
(B)
is light and very resistant to corrosion
18
Which of the following arrangements of elements is in order of increasing ionization energy?
Answer
(C)
Al, Si, P, S
19
Consider the reaction represented by the equation:
If 0.1 mole of C\(_3\)H\(_8\) was completely burnt, what volume of CO\(_2\) would be produced at stp? [volume of gas at stp = 22.4dm\(^3\)mol\(^{-1}\)].
Answer
(A)
6.72dm\(^3\)
20
Naturally occurring Boron is made up of 19.9% \(^{10}\)B and 80.1% \(^{11}\)B. The relative atomic mass of Boron is
Answer
(B)
10.8
21
The number of shared pair of electrons in a molecule of methane is
Answer
(B)
4
22
Isotopes of the same element have similar chemical properties because they have the same number of
Answer
(B)
protons
23
Which of the following household liquids would be effective in treating someone with too much acid in the stomach?
Answer
(C)
Milk of Magnesia with pH 10.5
24
The percentage by mass of Oxygen in MgSO\(_4\).7H\(_2\)O is [ M\(_r\) of MgSO\(_4\).7H\(_2\)O = 246 ]
Answer
(C)
71.5%
25
Catalysts alter reaction rates by
Answer
(A)
providing an alternative reaction pathway
26
Ethane of volume 400 cm\(^3\) was completely burnt in excess oxygen according to the following equation:
