Chemistry 2015 | Study Mode

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Question 61
A
A constant values
B
an increase in pressure
C
a decrease pressure
D
a decrease volume
Explanation
A decrease in pressure will result in the breaking or splitting of a larger molecule into a simpler ones. Options A, B, D are not in conformance to the reaction

Correct option: C
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Question 62
A
pink
B
colourless
C
red
D
dark blue
Explanation
Chlorine turns a damp starch iodide paper into dark blue or blue black.

Correct option: D
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Question 63
A
20
B
25
C
60
D
75
Explanation
Let the relative abundance of the energy with mass 37 be
Total relative abundance of the isotope of mass 359100-k)
Total mass of isotope of mass 37-37x, while that of 35-359(100x)
-37x + 3500 35 35.5
-37x + 3500 35n 35.5
Mean mass of chlorine atom (2n + 3500)/ 100
= 35.5
2x + 3500 3550yx = 50/2

Correct option: B
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Question 64
A
methane
B
ethane
C
propane
D
Butane
Explanation
Methane CH4.A. is the principal and commercial constituent natural gas. Option B,C,D are also constituent of natural gas but they are not commercial and of economic importance

Correct option: A
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Question 65
A
CH3C = CH
B
CH3CH = CH2
C
CH3CH2C = CH
D
CH33CH2CH3
Explanation
2VD = Rmm
VD = Vapour Density, Rmm = relative
2 20 40 molecular mass
Mole of carbon 36/12
= 3
Mole of H2 = 40 36
= 4
The compound contains 3mole of carbon and 4 hydrogen

Correct option: A
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Question 66
A
4H+ 4e - 2H2
B
4OH-- 4e = 2H2O + O2
C
2OH - 2e- = 2OH
D
2OH- + 2OH = 2H2O + O2
Explanation
40H 4e 2H2O + O2is the reaction of sun at the anode in the electrolysis of CuSO4 (g) using platinum particles. Option A,C,D are not formed as a result of the equation

Correct option: B
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Question 67
A
groups 1, 2, 3
B
groups 1, and 2
C
group 3
D
group 3 to 7
Explanation

S block elements only are made up of group 1 and 2 options A,C,D takes place of the other blocks in the periodic table p,d,f etc.


Correct option: B
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Question 68
A
-4
B
-2
C
4
D
-8
Explanation
In SO4. The state of oxygen oxidation number is -2. Options A,C,D do not belong to the oxidation state in SO4

Correct option: B
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Question 69
A
platinum
B
copper
C
zinc
D
carbon
Explanation
In the industrial of brine carbon is the anode while mercury is the cathode. Options of A, B, C are not used in brine solution because they are alloy of mercury

Correct option: D
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Question 70
A
56
B
100
C
76
D
90
Explanation
One molecule of CaCO has 1Ca, 1C and 30 atom relative molecular mass of CaCO3
1 Ar of Ca +1 Ar of C +3 Ar of O
(1 40 + 1 12 + 3 1)
40 + 12 + 48
=100

Option A,C and D will not give 100

Correct option: B

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