Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
-
Question 71: A gas sample with an initial volume of 3.25 dm3 is heated and allowed to expand to 9.75 dm3 at constant pressure. What is the ratio of the final absolute temperature to the initial absolute temperature?
Options:
A) 3:1
B) 5:2
C) 5:4
D) 8:3
Show Answer
The correct answer is A .
-
Question 72:
Which type of chemical combination involves the transfer of electrons from one atom to another, resulting in the formation of oppositely charged ions?
Options:
A) Ionic bonding
B) Hydrogen bonding
C) Covalent bonding
D) Metallic bonding
Show Answer
The correct answer is A .
-
Question 73:
What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
[ F = 96 5000 C mol-1 ]
Options:
A) 24 125 coulombs
B) 48 250 coulombs
C) 72 375 coulombs
D) 96 500 coulombs
Show Answer
The correct answer is B .
-
Question 74:
If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litres of water and the resulting solution mixed thoroughly, the resulting sulphuric acid concentration will be
Options:
A) 2.2M
B) 1.1M
C) 0.22M
D) 0.11M
Show Answer
The correct answer is C .
-
Question 75:
NaCO + 2HCl 2NaCl + HO + CO
The indicator most suitable for this reaction should have a pH equal to
Options:
A) 5
B) 7
C) 3
D) 9
Show Answer
The correct answer is C .
-
Question 76:
12D + 13T → 24He + 01n + energy
The reaction above illustrates
Options:
A) alpha decay
B) artificial transmutation
C) nuclear fussion
D) nuclear fission
Show Answer
The correct answer is C .
-
Question 77:
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.
Reaction of X with yeast forms the basis of the
Options:
A) plastic industry
B) textile industry
C) brewing industry
D) soap industry
E) dyeing industry
Show Answer
The correct answer is C .
-
Question 78: A liquid that will dissolve fat is
Options:
A) hydrochloric acid
B) calcium hydrochloride
C) kerosene
D) water
Show Answer
The correct answer is C .
-
Question 79:
The atomic weight of nitrogen is?
Options:
A) 10
B) 12
C) 14
D) 16
Show Answer
The correct answer is C .
-
Question 80: The leachate of a certain ash is used in local soap because it contain
Options:
A) sodium chloride and potassium hydroxide
B) sodium hydroxide
C) potassium hydroxide
D) soluble carbonates and hydrogen carbonate
Show Answer
The correct answer is B .