Question Library

Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.

Launch Interactive Practice
Searching 18,000+ Questions... Sifting topics, KaTeX formulas & verified solutions
Showing 16951–16965 of 29821 verified questions
Sort by:
Chemistry WAEC / WASSCE 2003 Air & Environmental Chemistry
What are the two gases associated with the formation of acid rain?
A
CO2 and HCI
B
CO2 and N2
C
CO2 and NO2
D
HCI ans SO2
medium Difficulty
Chemistry WAEC / WASSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following processes will pollute water?
A
Exposure of a body of water ultraviolet rays
B
Discharge of industrial effluents effluents into water ways
C
Passage of river water through a send bed
D
Addition of a measured quantity of chlorine to water
medium Difficulty
Chemistry NECO SSCE 2003 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which statement is NOT true about the composition of starch?
A
It contains only the atoms of carbon, hydrogen oxygen
B
It is a polysaccharide
C
Its empirical formula is C2H20.
D
It is made from the monomerC6H12O6.
E
The hydrogen and oxygen atoms are in the ratio 2:1.
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis
Chlorine is used in water purification because it
A
bleaches impurities in the water
B
decolorizes water
C
destroys bacteria
D
is extremely soluble in water
E
is pleasant tasting
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis
The number of hydrogen ions in 1.0dm\(^3\) of a 0.25 mole tetraoxosulphate(Vl) acid solution is [Avogadro constant = 6.02 x 10\(^{23}\)]
A
1.45x1023
B
1.50 x l023
C
3.00x1023
D
3.15x1023
E
6.00x1023
medium Difficulty
Chemistry NECO SSCE 2003 Atomic Structure, Orbitals & Nuclear Chemistry
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has
A
46 protons and 119 neutrons
B
92 protons and 92 neutrons
C
92 protons and 146 neutrons
D
92 protons and 238 neutrons
medium Difficulty
Chemistry NECO SSCE 2003 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The boiling point of water is higher than the boiling point of ethanol because
A
the bonding in water is electrovalent (ionic) whereas the bonding in ethanol is convalent
B
the hydrogen bonding between water molecules is stronger than the hydrogen bonding between ethanol molecules
C
water has a higher lattice energy than ethanol.
D
water has hydrogen bonding between its molecules but ethanol has no hydrogen bonging between its molecules;
E
water is a better solvent than ethanol.
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis
The reaction C2H6 → C2H + H2 is known as
A
dehydration
B
dehydrogenation
C
displacement
D
hydrogenation
E
reduction
medium Difficulty
Chemistry NECO SSCE 2003 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which is NOT a synthetic polymer?
A
nylon
B
Orion
C
Perspex
D
polystyrene
E
wool
medium Difficulty
Chemistry NECO SSCE 2003 Atomic Structure, Orbitals & Nuclear Chemistry
A calcium atom and a calcium ion have the same
A
chemical properties
B
electric charge
C
electronic structure
D
number of electrons
E
number of neutrons
medium Difficulty
Chemistry NECO SSCE 2003 Organic Chemistry I: Hydrocarbons & Crude Oil
Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?
A
CH3CH2CHO
B
CH3CH2CH2OH
C
CH3CH2COQH
D
CH3CH20CH
E
CH3CH3OH
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis
Which formula is used to indicate the degree of acidity of an acid?
A
\( [H^+] = ^{\text{mass of acid relative}} molecular mass of acid \)
B
F = number of H+ = ions x molar mass of the acid
C
Kw = [H+][OH-]
D
pH = - log10[H+]
E
pKa = -log10Ka
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis
What is the IUPAC name of CH3CCI=C(CH3)2?
A
2-chloro -3 methylbut -2yne
B
2 -chloro -3 methylbut -2ene
C
2 -chloro -3 methylbutene
D
3- methyl -2-chlorobut -2-ene
E
3- methyl -2. chlorobut -2 yne
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis
What change will occur to the equilibrium mixture \( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?
A
A yellow precipitate of Cr(OH)3 is formed
B
An orange precipitate of Cr(OH)3 is formed
C
The colour changes from orange to yellow
D
The colour changes from yellow to orange
E
There is no visible reaction.
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis
Which element is the most electronegative?
A
calcium
B
fluorine
C
iodine
D
oxygen
E
sodium
medium Difficulty
Page 1131 of 1989