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Chemistry
UTME / JAMB 2009
Acids, Bases, and Salts
Solution
Lucas reagent is used to test for?
A
alkanes
B
alkanoic acids
C
alkanols
D
amines
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Lucas' reagent is a solution of anhydrous zinc chloride in concentrated hydrochloric acid. This solution is used to classify alcohols.
Source: Myschool Past Questions Archive (Record #4456)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
A compound commonly used for sterilization and preservation of specimens and food is
A
ethanol
B
benzene
C
ether
D
ammonia
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 #4457)
Chemistry
UTME / JAMB 2009
Organic Chemistry
Which of the following hydrocarbons is mainly used as fuel?
A
Methylene
B
Ethylene
C
Methane
D
Ethyne
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 #4459)
Chemistry
UTME / JAMB 2009
Stoichiometry & Mole Concept
The molecular formula of a common organic laboratory anaesthetic is
A
CHCl3
B
CHI3
C
CCl4
D
CHF3
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 #4460)
Chemistry
UTME / JAMB 2009
Stoichiometry & Mole Concept
Solution
The simplest branched-chain hydrocarbon is
A
ethane
B
ethene
C
propane
D
butane
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
The smallest branched alkane is isobutane. Notice that isobutane has the same molecular formula, C4H10, as n-butane but has a different structural formula.
Source: Myschool Past Questions Archive (Record #4461)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
Solution
If the relative atomic mass of an element is not a whole number, it can be deduced that the element is?
A
Naturally radioactive
B
abundant in nature
C
a transition metal
D
an isotopic mixture
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
This happens because the relative atomic mass is the average of all an element’s isotopes, weighted by how common each isotope is. If the isotopes have different masses, the average won’t be a whole number.
Source: Official Exam / Past Question Archive
Chemistry
WAEC / WASSCE 2009
Atomic Structure and Periodic Table
Which of the following scientists discovered the neutron?
A
Ernest Rutherford
B
J.J Thompson
C
James Chadwick
D
R. A. M illikan
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 #37308)
Chemistry
WAEC / WASSCE 2009
Atomic Structure and Periodic Table
How many protons does 4020Ca contain?
A
20
B
30
C
40
D
60
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 #37309)
Chemistry
WAEC / WASSCE 2009
Stoichiometry & Mole Concept
If 100 atoms of element X contains 70 atoms of 9X and 30 atoms of 11X, calculate the relative atomic mass of X
A
9.6
B
10.6
C
11.6
D
20.0
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 #37313)
Chemistry
WAEC / WASSCE 2009
Matter & Separation Techniques
Consider the reaction represented by the equation: 23892U + 10 → 139 56Ba + 94 36Kr + 31 0n. The reaction represents a
A
nuclear fission
B
nuclear fusion
C
radioactive decay
D
spontaneous disintegration
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 #37317)
Chemistry
WAEC / WASSCE 2009
Atomic Structure and Periodic Table
How many orbitals are associated with the p-sub energy level?
A
2
B
3
C
5
D
6
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 #37319)
Chemistry
WAEC / WASSCE 2009
Atomic Structure and Periodic Table
Which of the following elements has the electronic configuration:1s22s22p63s23p1? [11Na, 13A1,
14N,16S]
A
Al
B
Na
C
N
D
S
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 #37321)
Chemistry
WAEC / WASSCE 2009
Matter & Separation Techniques
The following properties are characteristics of transition elements except
A
formation of complex ions
B
fixed oxidation states
C
formation of coloured compounds
D
catalytic abilities
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 #37322)
Chemistry
WAEC / WASSCE 2009
Atomic Structure and Periodic Table
Solution
Which of the following ions is isoelectronic with neon? [\(_3\)Li, \(_9\)F, \(_{10}\)Ne, \(_{17}\)CI,\(_{19}\)K ]
A
CI-
B
F-
C
K+
D
Li,+
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Neon has electronic configuration of 2,8
\(_3\)Li\(^+\) has electronic configuration of 2 (because the + sign shows it has given out one electron from the initial 2, 1, and now has 2 with only one shell)
\(_9\)F\(^-\) has electronic configuration of 2, 8 (because the - sign shows it has accepted one electron and now the initial 2, 7, now becomes 2,8 with only 2 shells)
\(_{17}\)CI\(^-\) has electronic configuration of 2,8,8 (because the - sign shows it has accepted one electron and now the initial 2,8, 7,now becomes 2,8,8 with only 3 shells)
\(_{19}\)K\(^+\) has electronic configuration of 2,8,8(because the - sign shows it has given out one electron and now the initial 2,8,8,1 now becomes 2,8,8 with only 3 shells)
Among all the options above, the only one that has the same number of electrons (Isoelectronic) with Neon (2,8) is \(_9\)F\(^-\) (2,8)
Source: Myschool Past Questions Archive (Record #37323)
Chemistry
WAEC / WASSCE 2009
Atomic Structure and Periodic Table
Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?
A
1s2 2s2 2p2
B
1s2 2s2 2p6
C
1s2 2s2 2p6 3s2 3p4
D
1s2 2s2 2p6 3s2 3p6 4s1
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 #37328)