Chemistry 2015 | Study Mode

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Question 51
A
electroplating
B
Arc-welding
C
reducing and mixture of their metallic
D
cooking a molten of the metals
Explanation.
Alloy is a metal that consist of two or more metals mixed together e.g. is mass which is an alloy of copper and zinc. Are not prepared with option A,B,C, and the do not result in mixture and metals together

Correct Option:
D
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Question 52
A
increase the making point office
B
increase the density of the ice
C
make the ice impure
D
rinse the making point of the ice
Explanation.
Salt is good chemical agent that lowers the melting of an ice only it temperature below 0C options B,C,D will not have the melting point except is above the 0 C. only salt does that.

Correct Option:
A
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Question 53
A
135.0cm3
B
150.0cm3
C
45.0cm3
D
90.0cm3
Explanation.
CH4(g) + 2O2(g) 2H2O(g)
1 volume of methane will react with 90cm3 of oxygen at S.T.P

Correct Option:
D
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Question 54
A
oxygen
B
chlorine
C
nitrogen
D
hydrogen
Explanation.
Oxygen is a substance that is used to remove impurities from pig iron. Options B, C, D will be effective in removing impurities positive]

Correct Option:
A
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Question 55
A
carbon
B
carbon(iv)oxide
C
ethane
D
ethanol
Explanation.
Carbon concentration of 4 will not give a precipitate heating. Option B,C,D will not be dehydrated

Correct Option:
A
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Question 56
A
are monoatomic
B
form ions easily
C
have duplet or octet electronic configuration in the outermost shells in their atoms
D
are volatile gases
Explanation.
Rare gases are stable because they have duplet or octet electronic configurations in the outermost shells in their atoms, as a result they dont go into solution easily. option A, B, Dare not because they go into solution easily (unstable)

Correct Option:
C
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Question 57
A
propanal
B
ethanol
C
methanoic acid
D
glucose
Explanation.
Ethanol has the molecular formula C2H6O. Option A, C, D are not because their molecular are not different

Correct Option:
B
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Question 58
A
remain unchanged
B
increase
C
decrease
D
charge
Explanation.
The bubble remain the same because entropy favors the mixture as it is the degree of randomness or disorderliness. Option B,C,D will not favors the entropy

Correct Option:
A
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Question 59
A
14
B
13
C
12
D
11
Explanation.
[H+][OH] = 10 4
[H+] =10 14 [OH+]
=10 14 (1 10 3) = 10 11
pH = log10[H+ ]
= log10[10 11] = 1 11
log10[10 11] = 1
= 1 11 1
= 11

Correct Option:
D
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Question 60
A
decrease
B
increase
C
remain constant
D
be zero
Explanation.

Gases are in constant motion. The temperature, pressure and volume only affect the already ongoing motion, either increasing or decreasing it. The absence of temperature only causes the motion to remain at a constant point. Hence, it remains at a constant kinetic energy.


Correct Option:
C

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