2020 - JAMB Chemistry Past Questions and Answers - page 2
11
When water drops are added to calcium carbide in a container and the gas produced is passed through a jet and lighted, the resultant flame is called an?
A
Oxyethene
B
Oxyhydrocarbon flame
C
Oxyacetylene flame
D
Oxymethane flame
12
Which of the following substances is a mixture?
A
Granulated sugar
B
Seawater
C
Sodium chloride
D
Iron filling
13
If the quantity of oxygen occupying 2.76L container at a pressure of 0.825 atm and 300k is reduced by one-half, what is the pressure exerted by the remaining gas?
A
1.650atm
B
0.825atm
C
0.413atm
D
0.275atm
14
Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?
A
P
B
Q
C
R
D
S
15
The products of the thermal decomposition of ammonium trioxonitrate(v) are?
A
Nitrogen (I) Oxide and Water
B
Ammonia and Oxide
C
Nitrogen and Water
D
Nitrogen (IV) Oxide and Water
16
How many valence electrons are contained in the element \(^{31}_{15}P\)?
A
3
B
4
C
15
D
31
17
The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO\(_3\) is treated with 0.2dm\(^3\) of 1 Mole of HCL in the equation
CaCO\(_3\) + 2HCL ⇒  CaCl\(_2\)  + H\(_2\) O + CO\(_2\)  , is ?
A
1.00 X 10\(^{23}\)
B
6.02 X 10\(^{23}\)
C
6.02 X 10\(^{22}\)
D
6.02 X 10\(^{24}\)
18
The volume occupied by 1.58g of a gas at S.T.P is 500cm\(^3\). What is the relative molecular mass of the gas? [ G.M.V at S.T.P = 22.4dm\(^{23}\) ]
A
28
B
32
C
44
D
74
19
Which of the following gases will rekindle a brightly splint?
A
B. NO\(_2\)
B
NO
C
N\(_2\)O
D
CL\(_2\)
20
The shape of ammonia molecule is?
A
Trigonal planar
B
Octahedral
C
Square planar
D
Tetrahedral
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