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Chemistry NECO SSCE 2001 Atomic Structure, Orbitals & Nuclear Chemistry
what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)
A
Artificial radioactivity
B
nuclear fission
C
nuclear fusion
D
radio-decomposition
E
spontaneous disintegration
medium Difficulty
Chemistry NECO SSCE 2001 Oxidation, Reduction & Redox Reactions
Which compound can be used as a reducing agent in a reaction?
A
Cl2
B
KMnO4
C
KCr2O7
D
MnO2
E
Na2SO3
medium Difficulty
Chemistry NECO SSCE 2001 Stoichiometry, Mole Concept & Volumetric Analysis
Which metal will dissolve in aqueous sodium hydroxide?
A
aluminium
B
copper
C
iron
D
sikeer
E
tin
medium Difficulty
Chemistry NECO SSCE 2001 Particulate Nature of Matter, Laws & Formulae
in any chemical reaction, the total mass of products is always equal to that of the reactants. This Is statement of the law of:
A
conservation of matter.
B
Constant composition
C
definite proportions.
D
multiple proportions.
E
reciprocal proportions.
medium Difficulty
Chemistry NECO SSCE 2001 Metals, Transition Elements & Extraction
The alloy used for welding and plumbing contains
A
aluminum and copper.
B
copper and tin
C
iron and aluminum.
D
lead and antimony.
E
lead and tin.
medium Difficulty
Chemistry NECO SSCE 2001 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which compound is a product of the hydrolysis of the of CH\(_3\)COOC\(_3\)H\(_7\) with aqueous sodium hydroxide?
A
CH3COONa
B
CH3COONaCCH3OH
C
CH3OH
D
C2H5OH
E
C3H7COONa
medium Difficulty
Chemistry NECO SSCE 2001 Non-Metals & Their Compounds
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
A
black
B
blue
C
green
D
white
E
yellow
medium Difficulty
Chemistry NECO SSCE 2001 Atomic Structure, Orbitals & Nuclear Chemistry
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
A
3
B
9
C
10
D
18
E
32
medium Difficulty
Chemistry NECO SSCE 2001 Kinetic Theory of Matter & Gas Laws
What is the ratio of the rate of diffusion of carbon(IV) oxide to that of propane, under the same conditions? [H = 1; C= 12; 0= 161
A
1:01
B
1:10
C
2:01
D
2:03
E
3:01
medium Difficulty
Chemistry NECO SSCE 2001 Stoichiometry, Mole Concept & Volumetric Analysis
How much sodium hydroxide is required to make 250 cm3 of 0.1 molar solution? Na=23; 0=16; H=1]
A
10.0 g
B
4.0g
C
2.0 g
D
1 .0g
E
0.1 g
medium Difficulty
Chemistry NECO SSCE 2001 Oxidation, Reduction & Redox Reactions
The oxidation number of X in \(XO_{4}^{3-}\) is
A
1
B
-2
C
3
D
4
E
5
medium Difficulty
Chemistry NECO SSCE 2001 Chemical Bonding & Intermolecular Forces
The high boiling point of hydrogen fluoride can be explained in terms of
A
covalent bonds.
B
dative bonds.
C
dipole-dipole bonds.
D
electrovalent (ionic) bonds
E
hydrogen bonds.
medium Difficulty
Chemistry NECO SSCE 2001 Reaction Rates & Chemical Equilibrium
Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction II. it is effective in a reaction but cannot initiate a reaction III, it affects the equilibrium of a reversible reaction IV. it affects the overall reaction
A
I and II only
B
I, II and III only
C
II and III only
D
II, II and IV only
E
III and IV only
medium Difficulty
Chemistry NECO SSCE 2001 Oxidation, Reduction & Redox Reactions
White is NOT a property of metals?
A
ductile:
B
malleable
C
conduct heat and electricity
D
have many oxidation states
E
high melting points anti boiling points
medium Difficulty
Chemistry NECO SSCE 2001 Atomic Structure, Orbitals & Nuclear Chemistry
The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to
A
Becquerel.
B
Bohr.
C
de Broglie.
D
Rutherford.
E
Thompson.
medium Difficulty
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