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Chemistry NECO SSCE 2009 Matter & Separation Techniques
A neon atom is chemically nonreactive because
A
the electrons at the outermost shell is partially filled
B
the number of protons equals the number of electrons
C
the outer electron shell is completely filled
D
there are equal number of protons and neutrons in its nucleus
E
there are no elections at the outermost shell
medium Difficulty
Chemistry NECO SSCE 2009 Acids, Bases, and Salts
In the electrolysis of dilute tetraoxosulphate (VI) acid using platinum electrodes, the products obtained at the anode are cathode respectively are
A
hydrogen, oxygen
B
Hydrogen, tetraoxosulphate (VI) ion
C
oxygen, hydrogen
D
sulphur, hydrogen
E
sulphur, oxygen
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
C\(_6\)H\(_{12}\)O\(_6\) What is the molar mass of the compound above? [ H=1, C=12, O=16 }
A
45
B
61
C
180
D
123
E
244
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
If the volume of a gas at 35^\circC is 60cm\(^3\), what would be its volume in cm\(^3\) at 273k?
A
39.03
B
46.81
C
53.18
D
67.69
E
76.92
medium Difficulty
Chemistry NECO SSCE 2009 Acids, Bases, and Salts
Sulphur has an oxidation number of +4 in
A
H2S
B
H2S04
C
MgSO4
D
Na2SO3
E
S03
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
Atomic size decreases
A
across a period from left to right
B
across a period from right to left
C
diagonally down the group
D
down a group
E
with decrease in atomic number
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
A salt which loses its mass when exposed to air is
A
deliquescent
B
effervescent
C
Efflorescent
D
fluorescent
E
hygroscopic
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
When air is passed through alkaline pyrogallol and then lime water, the gases left are
A
nitrogen and carbon (IV) oxide
B
nitrogen and noble gases
C
nitrogen and oxygen
D
nitrogen, carbon (VI) oxide and noble gases
E
the noble gases
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
How many zones are present in a luminous Bunsen burner flame?
A
2
B
3
C
4
D
5
E
6
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]
A
0.32
B
0.64
C
3.18
D
6.35
E
9.65
medium Difficulty
Chemistry NECO SSCE 2009 Electrochemistry and Redox
Which of the following metals is NOT extracted by electrolysis?
A
Aluminium
B
Calcium
C
iron
D
Magnesium
E
Sodium
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
The furring of kettles and boilers are caused by
A
calcium hydroxide
B
calcium hydrogen trioxocarbonate (IV)
C
calcium trioxocarbonate (IV)
D
calcium tetraoxocarbonate
E
magnesium tetraoxocarbonate (VI)
medium Difficulty
Chemistry NECO SSCE 2009 Atomic Structure and Periodic Table
Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding
A
covalent
B
dative
C
electrovalent
D
hydrogen
E
metallic
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
The Ideal Gas Law is expressed mathematically as
A
P1 /T1 = P2/T2
B
P1/V1 = P2V2
C
PV =nRT
D
PV =KT
E
V1/T1 = V2/T2
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
Non-polar molecules are held together by
A
co-ordinate bond
B
covalent bond
C
electromagnetic force
D
hydrogen bond
E
Van der Waals forces
medium Difficulty
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