Chemistry 2018 | Study Mode

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Question 41
A
42 
B
45 
C
126 
D
180 
Explanation.
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Molecular formula = (empirical formula x n)

where n= (1,2,3,...)

\(CH_{2}O = 12 + (2\times 1) + 16 = 30\)

Relative molecular mass = (30 x n)

From the options, only 180 is a multiple of 30, when n=6.


Correct Option:
D
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Question 42
A
do not conduct electricity 
B
contain equal number of protons and electrons 
C
are composed of neutrons and electrons 
D
cannot be attracted by electromagnetic field. 
Explanation.
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Atoms are electrically neutral because they contain equal amount of positive and negative charge. This is because they have equal number of protons and electrons.


Correct Option:
B
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Question 43
A
Solubility in water 
B
Melting point 
C
Relative density 
D
Crystalline nature 
Explanation.
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No official Explanation yet!


Correct Option:
B
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Question 44
A
\(1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{4}\) 
B
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6}\) 
C
\(1s^{2}2s^{2}2p^{6}3s^{2}3d^{4} 4s^{1}\) 
D
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\) 
Explanation.
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No official Explanation yet!


Correct Option:
D
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Question 45
A
has a totally filled valence shell 
B
has a high charge to mass ratio 
C
does not contain neutrons 
D
exhibits isotopy 
Explanation.
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No official Explanation yet!


Correct Option:
C
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Question 46
A
B
C
10 
D
12 
Explanation.
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Each double bond has two pairs of valence electrons shared to form a covalent bonding. Also, every C-H bond, has 2 valence elctrons involved. Drawing the Lewis structure, you see that the above compound has 12 valence electrons shared.


Correct Option:
D
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Question 47
A
chlorine has a larger atomic size 
B
chlorine has a larger atomic mass 
C
chlorine is more electronegative 
D
there is no bonding orbitals within the hydrogen atom 
Explanation.
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The chlorine atom is much more electronegative than the hydrogen atom, which makes this bond polar.


Correct Option:
C
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Question 48
A
Van der Waal's forces 
B
Ionic attraction 
C
dipole attraction 
D
covalent bonding 
Explanation.
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In CO2, due to electronegativity difference oxygens have slight negative charge, hence surrounded by polar water molecule forming a cage structure.This leads to its solubility.


Correct Option:
A
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Question 49
A
Electronegativity 
B
Electron Affinity 
C
Ionization potential 
D
Catalytic ability 
Explanation.
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Every other factor influences the formation of elecrovalent or Ionic bonds except Catalytic ability.


Correct Option:
D
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Question 50
A
vibrational motion 
B
vibrational and translational motion 
C
vibrational and random motion 
D
random and translational motion 
Explanation.
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Solids vibrate but generally do not move from place to place.


Correct Option:
A
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