# Chemistry 2018 | Study Mode

Question 41
A
42
B
45
C
126
D
180
##### Explanation

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.

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

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.

Question 43
A
Solubility in water
B
Melting point
C
Relative density
D
Crystalline nature
##### Explanation

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

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

Question 46
A
5
B
8
C
10
D
12
##### Explanation

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.

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

The chlorine atom is much more electronegative than the hydrogen atom, which makes this bond polar.

Question 48
A
Van der Waal's forces
B
Ionic attraction
C
dipole attraction
D
covalent bonding
##### Explanation

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.

Question 49
A
Electronegativity
B
Electron Affinity
C
Ionization potential
D
Catalytic ability
##### Explanation

Every other factor influences the formation of elecrovalent or Ionic bonds except Catalytic ability.

Question 50
A
vibrational motion
B
vibrational and translational motion
C
vibrational and random motion
D
random and translational motion
##### Explanation

Solids vibrate but generally do not move from place to place.

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