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Chemistry
UTME / JAMB 2018
Water and Solubility Concept
Solution
Which of these sources of water may likely contain the least concentration of Ca\(^{2+}\) and Mg\(^{2+}\)?
A
Spring water
B
River water
C
Tap water
D
Sea water
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Tap water is likely to contain less Ca\(^{2+}\) and Mg\(^{2+}\). The reason is because looking through all the given options, spring water, river water and sea water are natural water that has not undergone any treatment. Conversely, it is believed that before tap water is distributed for consumption, it must have been treated, thereby reducing the Ca\(^{2+}\) and Mg\(^{2+}\) content in the water.
Source: WAEC / JAMB / NECO Classroom Archive (Record #47654)
Chemistry
UTME / JAMB 2018
Matter & Separation Techniques
According to Charles' law, the volume of a gas becomes zero at
A
0°C
B
-100°C
C
-273°C
D
-373°C
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #47285)
Chemistry
UTME / JAMB 2018
Matter & Separation Techniques
A substance that is used as a ripening agent for fruits is
A
ethene
B
propane
C
methane
D
butane
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47286)
Chemistry
UTME / JAMB 2018
Acids, Bases, and Salts
Solution
The Sulphide which is insoluble in dilute hydrochloric acid is
A
FeS
B
CuS
C
ZnS
D
Na2S
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Sulphides like PbS (lead (II) sulphide) and CuS (copper (II) sulphide) are insoluble in acidified solutions.
Source: Myschool Past Questions Archive (Record #47287)
Chemistry
UTME / JAMB 2018
Matter & Separation Techniques
An element used in the production of matches is
A
nitrogen
B
aluminium
C
copper
D
sulphur
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #47294)
Chemistry
UTME / JAMB 2018
Acids, Bases, and Salts
Which of the following gases may not be dried with concentrated sulphuric acid?
A
HCl\(_{(g)}\)
B
NH\(_3\)
C
Cl\(_2\)
D
SO\(_2\)
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #47296)
Chemistry
UTME / JAMB 2018
Organic Chemistry
The Consecutive members of an alkane homologous series differ by
A
CH
B
CH\(_2\)
C
CH\(_3\)
D
C\(_n\)H\(_n\)
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #47314)
Chemistry
UTME / JAMB 2018
Matter & Separation Techniques
A correct electrochemical series can be obtained from Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging
A
Al and Mg
B
Zn and Fe
C
Zn and Pb
D
Pb and H
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47316)
Chemistry
UTME / JAMB 2018
Stoichiometry & Mole Concept
Solution
A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that
A
collisions are perfectly elastic
B
forces of repulsion exist
C
forces of repulsion and attraction are in equilibrium
D
collisions are inelastic
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
According to one of the kinetic theories of gases, When collisions occur, the molecules lose no kinetic energy; that is, the collisions are said to be perfectly elastic.
Source: Myschool Past Questions Archive (Record #47317)
Chemistry
UTME / JAMB 2018
Acids, Bases, and Salts
What is the PH of 0.00 1 moldm\(^3\) solution of the sodium hydroxide
A
14
B
13
C
12
D
11
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #47288)
Chemistry
UTME / JAMB 2018
Atomic Structure and Periodic Table
The type of bonding in [Cu(NH\(_3\))\(^4\)]\(^{2+}\) is
A
coordinate
B
electrovalent
C
metallic
D
covalent
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47289)
Chemistry
UTME / JAMB 2018
Matter & Separation Techniques
Which of the following is an example of a chemical change?
A
dissolution of salt in water
B
rusting of iron
C
melting of ice
D
separating a mixture by distillation
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #47290)
Chemistry
UTME / JAMB 2018
Matter & Separation Techniques
Solution
To what temperature must a gas at 273k be heated in order to double both its volume and pressure?
A
298K
B
546K
C
819K
D
1092K
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Given:
T\(_1\) = 273K ; V\(_1\) = X ; P\(_1\) = Y
T\(_2\) = ? ; V\(_2\) = 2X P\(_2\) = 2Y ( Remember we were told the volume and pressure were doubled )
We also represented V\(_1\) and P\(_1\) to be X and Y respective,y since we were not given.
Using the formula: \(\frac{{P_1}{V_1}}{T_1}\) = \(\frac{{P_2}{V_2}}{T_2}\)
T\(_2\) = \(\frac{{P_2}{V_2}{T_1}}{{P_1}{V_1}}\)
= \(\frac{{2Y}\times{2X}\times{273}}{{Y}\times{X}}\)
= 2 x 2 x 273
= 1092 K
Source: Myschool Past Questions Archive (Record #47291)
Chemistry
UTME / JAMB 2018
Stoichiometry & Mole Concept
Solution
According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to
A
decrease
B
increase
C
be zero
D
remain constant
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
According to the kinetic theory of gases, when a substance is heated, the average kinetic energy of its molecules increases and this leads to a rise in temperature.
Source: Myschool Past Questions Archive (Record #47292)
Chemistry
UTME / JAMB 2018
Matter & Separation Techniques
Solution
On which of the following is the solubility of a gaseous substance dependent?
I. Nature of solvent
II. Nature of solute
III. Temperature
IV. Pressure
A
I, II, III and IV
B
I and II only
C
II only
D
III and IV only
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
The solubility of a gas decreases with an increase in temperature and a decrease in pressure.
Source: Myschool Past Questions Archive (Record #47318)