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 241: The repeating unit in natural rubber is
Options:
A) alkyne
B) isoprene
C) n-propene
D) peoprene
Show Answer
The correct answer is B .
-
Question 242: The air around a petroleum refinery is most likely to contain?
Options:
A) CO2, SO3 and N2O
B) CO2, CO and N2O
C) SO2, CO and NO2
D) PH3 H2O and CO2
Show Answer
The correct answer is C .
-
Question 243:
What is the molar mass of water (H2O)?
Options:
A) 18 g/mol
B) 22 g/mol
C) 16 g/mol
D) 12 g/mol
Show Answer
The correct answer is A .
-
Question 244: The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as?
Options:
A) Brownian movement
B) condensation
C) evaporation
D) liquefaction
Show Answer
The correct answer is C .
-
Question 245:
An organic compound X has the following properties:
I. It is not miscible with water.
ll. It has boiling point of 77oC.
lll. It has a sweet odour.
IV. lt is insoluble in sodium hydrogen carbonate solution.
V lt does not decolourize bromine water.
X is therefore
Options:
A) methane
B) ethanoic acid
C) ethene
D) ethyl ethanoate
E) carbon tetrachloride
Show Answer
The correct answer is D .
-
Question 246: Which of these metals, Mg, Fe, Pb and Cu will dissolve in dilute HCI?
Options:
A) All the metals
B) Mg ,Fe and Cu
C) Mg, Fe and Pb
D) Mg and Fe only
E) Mg only
Show Answer
The correct answer is D .
-
Question 247:
Deliquescent substances are also?
Options:
A) efflorescent
B) anhydrous
C) hygroscopic
D) insoluble
Show Answer
The correct answer is C .
-
Question 248:
The diagram above represents an atom that can combine with chlorine to form
Options:
A) a covalent bond
B) an electrovalent bond
C) a hydrogen bond
D) a co-ordinate bond
Show Answer
The correct answer is B .
-
Question 249:
Use the diagram to answer this question.
The gas that can be used to demonstrate the experiment is
Options:
A) hydrogen chloride
B) hydrogen sulphide
C) nitrogen(ll) oxide
D) dinitrogen (l) oxide
Show Answer
The correct answer is A .
-
Question 250: 60cm3 of hydrogen are sparked with 20cm3 of oxygen at 100°C and 1 atmosphere. The total volume of the residual gases is?
Options:
A) 60 cm3
B) 10 cm3
C) 40 cm3
D) 30 cm3
E) 70 cm3
Show Answer
The correct answer is A .