Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 2041–2055 of 4783 verified questions
Sort by:
Chemistry
WAEC / WASSCE 2009
Stoichiometry & Mole Concept
Solution
The product of the reaction between C\(_2\)H\(_5\)OH and concentrated H\(_2\)SO\(_4\) at 170\(^0\)C is
A
(C2H5)2SO4
B
CH 3CH 2HSO 4
C
(C2H5)2O
D
CH2 = CH 2
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Ethanol undergoes intramolecular dehydration at 170\(^0\)C, to produce ethene, CH\(_2\)=CH\(_2\). Concentrated sulphuric acid acts as a catalyst. It also acts as a dehydrating agent. This process eliminates a water molecule.
Source: Myschool Past Questions Archive (Record #37408)
Chemistry
WAEC / WASSCE 2009
Matter & Separation Techniques
When protein is heated to a high temperature it undergoes
A
condensation
B
denaturation
C
hydrolysis
D
polymerization
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 #37410)
Chemistry
WAEC / WASSCE 2009
Stoichiometry & Mole Concept
What is the molecular formula of a compound with empirical CH2O and vapour density of 90? [H = 1, C = 12, O = 16]
A
C4H8O 2
B
C4H 8O3
C
C6H10C5
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 #37411)
Chemistry
WAEC / WASSCE 2009
Stoichiometry & Mole Concept
What is the product of the reaction between propene and 1 mole of hydrogen iodide?
A
CH3CHICH3
B
CH 3CH2CHI2
C
CH 3CH 2CI3
D
CH 3CHICH2I
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 #37412)
Chemistry
WAEC / WASSCE 2009
Acids, Bases, and Salts
Ethanol reacts with excess acidified K2Cr 2O7 to produce
A
ethanal
B
ethane
C
ethanoic acid
D
ethylethanoate
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 #37413)
Chemistry
WAEC / WASSCE 2009
Organic Chemistry
Dry hydrogen chloride when dissolved in methylbenzene
A
turns blue litmus paper red
B
turns red litmus paper blue
C
does not affect litmus paper
D
bleaches litmus paper
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 #37414)
Chemistry
WAEC / WASSCE 2009
Matter & Separation Techniques
A consequence of global warming is
A
air pollution
B
flooding
C
increased humidity
D
low rainfall
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 #37415)
Chemistry
WAEC / WASSCE 2009
Matter & Separation Techniques
The major product in the solvay process is
A
NaOH
B
Na 2CO 3
C
NH 3
D
H 2SO4
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 #37416)
Chemistry
WAEC / WASSCE 2009
Matter & Separation Techniques
Which of the following alloys does not contain copper? l. Brass II. Bronze III. Steel
A
l only
B
ll only
C
lll only
D
ll and lll only
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 #37417)
Chemistry
WAEC / WASSCE 2009
Atomic Structure and Periodic Table
The electron configuration of carbon atom in its excited state is [ 6C]
A
1s22s 22px12py 1
B
1s 2 2s 22px 22pyo
C
1s12s22px12py12pz1
D
1s 22s12px12py12pz1
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 #37419)
Chemistry
WAEC / WASSCE 2009
Matter & Separation Techniques
An important medical use of nuclear radiations is
A
activation analysis
B
carbon dating
C
radiotherapy
D
tissue regeneration
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 #37421)
Chemistry
WAEC / WASSCE 2009
Matter & Separation Techniques
Which of the following elements exhibits the same chemical properties as the atom \(\frac{35}{17}\)X? An element with
A
atomic number 17
B
atomic number 18
C
mass number 35
D
mass number 52
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 #37425)
Chemistry
WAEC / WASSCE 2009
Atomic Structure and Periodic Table
Solution
Which of the following noble gases has electronic structure similar to that of N in NH\(_3\)? [\(^{14}_7\)N]
A
2He
B
10Ne
C
18Ar
D
36Kr
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The nitrogen atom in ammonia NH\(_3\) has a similar outer shell configuration to Neon because it needs three more electrons to complete its outer shell. Hence, Nitrogen atom shares its three unpaired electrons with three covalent bonds.This configuration gives Nitrogen a stable octet of electrons, similar to the noble gas Neon, which also has a full outer energy level with eight eight electrons.
Source: Myschool Past Questions Archive (Record #37426)
Chemistry
NECO SSCE 2009
Matter & Separation Techniques
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is
A
ammonia
B
carbon(IV)oxide
C
hydrogen chloride
D
sulphur (IV) oxide
E
sulphur (VI) oxide
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 #43654)
Chemistry
NECO SSCE 2009
Matter & Separation Techniques
Which of the following equations is NOT balanced?
A
CH4(g) + 202(9) → CO2(g) + 2H2O(g)
B
CU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g)
C
2KCIO3(s) → 2KCI(s)+ 3O2(g)
D
NaH(s) + H2O(1) → NaOH(aq) +H2(g)
E
Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)
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 #43662)