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Chemistry
UTME / JAMB 2012
Acids, Bases, and Salts
Mineral acids are usually added to commercial hydrogen peroxide to
A
oxidize it
B
decompose it
C
minimize its decomposition
D
reduce it to water and oxygen
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 #27495)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
Which of the following compounds will burn with a brick-red colour in a non-luminous Bunsen flame?
A
LiCI
B
NaCl
C
CaCl2
D
MgCl2
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 #27496)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
The purest form of iron which contains only about 0.1% carbon is
A
pig iron
B
wrought iron
C
cast iron
D
iron pyrite
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 #27497)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
A common characteristic between zinc and the other transition elements is the ability to
A
have variable oxidation states
B
from complex ions
C
act as a catalyst
D
from coloured ions
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 #27498)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
Which of the following metals is the least reactive?
A
Pb
B
Sn
C
Hg
D
Au
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 #27499)
Chemistry
UTME / JAMB 2012
Organic Chemistry
Geometric isomerism can exist in
A
hex-3-ene
B
hexane
C
prop-l-ene
D
3-methyl but -l-ene
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 #27500)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
Alkanals can be distinguished from alkanones by the reaction with
A
sudan lll stain
B
starch iodide paper
C
lithium tetrahydrido aluminate (lll)
D
fehling's solution
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 #27501)
Chemistry
UTME / JAMB 2012
Organic Chemistry
The isomers of C3H8O ARE
A
1 - propanol and 2 - propanol
B
1 - propanol and 1 - propanol
C
2 - propanol and 2 - propanone
D
2 - propanol and 1 - propanol
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 #27502)
Chemistry
UTME / JAMB 2012
Stoichiometry & Mole Concept
Solution
Carbohydrates are large molecules with the molecular formula C\(_x\)(H\(_2\)O)\(_y\). In which of the following pairs is x not equal to y?
A
glucose and starch
B
maltose and starch
C
sucrose and fructose
D
galactose and starch
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Glucose = C\(_6\)(H\(_2\)O)\(_6\)
= C\(_6\)H\(_{12}\)O\(_6\)
Maltose = C\(_{12}\) (H\(_2\)O)\(_{11}\)
= C\(_{12}\)H\(_{22}\)O\(_{11}\)
Starch = C\(_6\) (H\(_2\)O)\(_5\)
= C\(_6\)H\(_{10}\)O\(_5\)
Sucrose = C\(_{12}\) (H\(_2\)O)\(_{11}\)
= C\(_{12}\)H\(_{22}\)O\(_{11}\)
Fructose = C\(_6\)(H\(_2\)O)\(_6\)
= C\(_6\)H\(_{12}\)O\(_6\)
Source: Myschool Past Questions Archive (Record #27503)
Chemistry
UTME / JAMB 2012
Stoichiometry & Mole Concept
A compound contains 40.0% C, 6.7% H 53.3% O. If the molecular mass of the compound is 180, its molecular formula is [C =12, H =1,O]
A
CH2O
B
C3H6O3
C
C6H6O3
D
C6H12O6
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 #27504)
Chemistry
UTME / JAMB 2012
Acids, Bases, and Salts
Solution
The saponification of an alkanoate to produce soap and alkanol involves
A
dehydration
B
esterification
C
hydrolysis
D
oxidation
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Saponification is a specific type of ester hydrolysis that occurs under basic conditions, typically using a base like sodium hydroxide (NaOH) or potassium hydroxide (KOH), resulting in the formation of a carboxylate salt (soap) and an alcohol.
Source: Myschool Past Questions Archive (Record #27505)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
2 - methyl propan -2- ol is an example of a
A
primary alkanol
B
secondary alkanol
C
tertiary alkanol
D
quartenary alkanol
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 #27506)
Chemistry
UTME / JAMB 2012
Acids, Bases, and Salts
Solution
Ethanol reacts with concentrated tetraoxosulphate (VI) acid at a temperature above 170\(^0\)C to form
A
ethanone
B
ethene
C
ethyne
D
ethanal
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
When ethanol reacts with concentrated sulfuric acid (H₂SO₄) at high temperatures (around 170^\circC), the major product is ethene (C₂H₄), along with water (H₂O).
C₂H₅OH → C₂H₄ + H₂O
Source: Myschool Past Questions Archive (Record #27507)
Chemistry
UTME / JAMB 2012
Electrochemistry and Redox
An example of oxidation - reduction enzyme is
A
amylase
B
protease
C
lipase
D
dehydrogenase
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 #27508)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
An example of oxidation - reduction enzyme is
A
amylase
B
protease
C
lipase
D
dehydrogenase
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: Official Exam / Past Question Archive