## 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.

No official Explanation yet!

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.

No official Explanation yet!

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.

No official Explanation yet!

Question 46
A
B
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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