Chemistry Test 25

Result

Chemistry Test 25

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following exists as covalent crystals in the solid state?

A
Silicon

B
Sulphur

C
Phosphorous

D
Iodine

Solution

Silicon (Si) – covalent solid
Sulphur (S₈) – molecular solid
Phosphorous (P₄) – Molecular solid
Iodine (I₂) – Molecular solid
Question 2
4 / -1

The polymer containing strong intermolecular forces e.g. hydrogen bonding, is

A
natural rubber

B
Teflon

C
nylon 6, 6

D
polystyrene

Solution

Nylon–6, 6 is a fibre (polyamide), it contains strong intermolecular forces.
Question 3
4 / -1

In which of the following arrangements the order is NOT according to the property indicated against it?

A
Al³⁺ < Mg²⁺ < Na⁺ < F^-
Increasing ionic size

B
B < C < N < O
Increasing first ionization enthalpy

C
I < Br < F < CI
Increasing electron gain enthalpy (with negative sign)

D
Li < Na < K < Rb
Increasing metallic radius

Solution

B < C < O < N
Question 4
4 / -1

Which of the following factors may be regarded as the main cause of lanthanide contraction?

A
Poor shielding of one of 4f electron by another in the subshell

B
Effective shielding of one of 4f electrons by another in the subshell

C
Poorer shielding of 5d electrons by 4f electrons

D
Greater shielding of 5d electrons by 4f electrons

Solution

The 4f-electrons constitute inner shells and are ineffective in screening the nuclear charge.
Question 5
4 / -1

Presence of a nitro group in a benzene ring

A
deactivates the ring towards nucleophilic substitution

B
deactivatesthe ring towards electrophilic substitution

C
activates the ring towards electrophilic substitution

D
renders the ring basic

Solution

Nitro group is deactivating group so it deactivates the ring toward electrophilic substitution

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Re-Attempt Weekly Quiz Competition

Chemistry Test 25

Result

Chemistry Test 25

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SHARING IS CARING

Question 1

Silicon

Sulphur

Phosphorous

Iodine

Solution

Question 2

natural rubber

Teflon

nylon 6, 6

polystyrene

Solution

Question 3

Al3+ < Mg2+ < Na+ < F- Increasing ionic size

B < C < N < O Increasing first ionization enthalpy

I < Br < F < CI Increasing electron gain enthalpy (with negative sign)

Li < Na < K < Rb Increasing metallic radius

Solution

Question 4

Poor shielding of one of 4f electron by another in the subshell

Effective shielding of one of 4f electrons by another in the subshell

Poorer shielding of 5d electrons by 4f electrons

Greater shielding of 5d electrons by 4f electrons

Solution

Question 5

deactivates the ring towards nucleophilic substitution

deactivatesthe ring towards electrophilic substitution

activates the ring towards electrophilic substitution

renders the ring basic

Solution

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Al³⁺ < Mg²⁺ < Na⁺ < F^-
Increasing ionic size

B < C < N < O
Increasing first ionization enthalpy

I < Br < F < CI
Increasing electron gain enthalpy (with negative sign)

Li < Na < K < Rb
Increasing metallic radius