2015 - JAMB Chemistry Past Questions and Answers - page 5
41
When sugar is dissolve in ten, the reaction is accomplished by
A
positive change
B
negative entropy change
C
no entropy change
D
a minimum entropy change
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42
NH3(g) + HCl(s) → NH 4Cl (s)
The entropy change in the system above is
The entropy change in the system above is
A
positive
B
zero
C
negative
D
intermediate
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43
Detergents are manufacture with strength hydrocarbon chains is to make them
A
soluble
B
biodegradable
C
cheaper
D
foamy
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44
Which of the following results in the fall of acid rain
A
oxide of lead
B
particulate matter
C
oxides of carbon
D
gaseous hydrocarbon
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45
The fuming of kettles is caused by the presence in the water of
A
calcium tetraoxosulphate (IV)
B
calcium hydrogentrionocarbonate (IV)
C
calcium hydroxide
D
calcium trioxocarbonate (IV)
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46
A difference between chemical and physical change is that in a chemical change
A
oxygen is consumed
B
heat is supplied
C
the reversible process occurs
D
a new substance is formed
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47
According to the kinetic theory an absence in temperature causes the kinetic energy of particles to
A
decrease
B
increase
C
remain constant
D
be zero
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48
PCL5(g)= PCL3(g) + Cl2(g)
In the reaction above, a decrease in pressure will
In the reaction above, a decrease in pressure will
A
Decelerate the reaction
B
Increase yield of Pcl3
C
Increase the yield of Pcl5
D
Accurate the reaction
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49
Which of the following gives a precipitation when treated with NaOH Solution?
A
AlCl3
B
NH4Cl
C
Na2CO3
D
CH3COONa
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50
Electronic configuration of an elements 13x in the subsidiary energy level is
A
\( 1s^2 2s^2 2p^6 3s^2 3p^1 \)
B
\( 1s^22s^2 2p^4 3p^1 3s^1 \)
C
\( 1s^2 2s^2 2p^6 3s^2 3p^3 \)
D
\( 1s^1 2s^2 2p^6 3s^2 3p^4 \)
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