P-Block Elements Test

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P-Block Elements Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following sets represents orthosilicates only?

A
Thortveitite, Phenacite, Willemite

B
Benitoite, Beryl, Phenacite

C
Willemite, Zircon, Kaolinite

D
Phenacite, Willemite, Zircon

Solution

Phenacite - Be₂SiO₄ : Orthosilicate

Willemite - Zn₂SiO₄ : Orthosilicate

Zircon - ZrSiO₄ : Orthosilicate
Question 2
1 / -0

Which of the following statements are FALSE?

P. The boiling point of PH₃ is lower than that of NH₃.

Q. Red phosphorus is more reactive than white phosphorus.

R. Phosphorus is sp³ hybridised in PCl₃.

S. In the solid state, PCl₅ exists as a covalent solid.

A
Both P and Q

B
Both P and R

C
Both P and S

D
Both Q and S

Solution

White phosphorus has a tetrahedral basic unit where four phosphorus atoms arranged at the four corners of a tetrahedron are joined together by a total of six single bonds.

The molecule is under tremendous strain, hence white phosphorous is highly reactive.

However, the strain is much less in case of red phosphorous on account of its polymeric structure.

Therefore, chemically, red phosphorus is much less reactive than white phosphorus and statement Q is incorrect.

In the solid state, PCl₅exists as an ionic solid [PCl₄]⁺[PCl₆]^–, in which the cation [PCl₄]⁺ is tetrahedral and the anion [PCl₆]^– is octahedral.

Hence, statement S is incorrect.

Option (4) is the correct answer.
Question 3
1 / -0

Which of the following statements are TRUE?

1. H₂S is more acidic than H₂Te.

2. Ozone is thermodynamically more stable than oxygen.

3. The two oxygen-oxygen bond lengths in the ozone molecule are identical.

4. Rhombic sulphur is the stable form of sulphur at room temperature.

A
Both 1 and 2

B
Both 1 and 4

C
Both 2 and 3

D
Both 3 and 4

Solution

The two oxygen-oxygen bond lengths in the ozone molecule are identical (128 pm) and the molecule is angular as expected with a bond angle of about 117^o.
Sulphur forms numerous allotropes, of which the yellow rhombic and monoclinic forms are the most important. The stable form at room temperature is rhombic sulphur, which transforms to monoclinic sulphur when heated above 369 K.
Question 4
1 / -0

Which of the following statements are FALSE regarding ozone?

1. Ozone is less stable than dioxygen.

2. Ozone is paramagnetic.

3. Ozone is violet-black in solid state.

4. Ozone molecule is linear.

A
Both 1 and 2

B
Both 1 and 4

C
Both 2 and 3

D
Both 2 and 4

Solution

Both are false statements.

Oxygen gas (O₂) is paramagnetic, but ozone (O₃) is diamagnetic.
O₃ molecule is bent.
Question 5
1 / -0

Upon hydrolysis, S₂Cl₂ slowly forms HCl, SO₂ and 'X'. Which of the following is 'X'?

A
SO₃

B
H₂

C
O₂

D
S

Solution

S₂Cl₂ is hydrolysed immediately by H₂O as per the following equation:

2S₂CI₂ + 2H₂O → 3S + SO₂+ 4HCI
Question 6
1 / -0

Which of the following is the correct statement?

A
Between NH₃ and PH₃, NH₃ is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

B
Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies spherical sp³orbital and is more directional.

C
Between NH₃ and PH₃, NH₃ is a better electron donor because the lone pair of electrons occupies spherical sp³orbital and is more directional.

D
Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

Solution

NH₃ is a better electron donor than PH₃ because the lone pair of electron occupies sp³orbital formed from the more compact 2s and 2p orbitals as compared to 3s and 3p orbitals of phosphorous in PH_3.
Question 7
1 / -0

Consider the following statements regarding Helium:

(i) It is used in gas cooled nuclear reactors.

(ii) It is used to produce and sustain powerful conducting magnets.

(iii) It is used as a cryogenic agent for carrying out experiment at low temperatures.

The correct order of initials T (true) and F (false) for the above statements is:

A
T, T, T

B
F, F, F

C
T, T, F

D
T, F, F

Solution

Helium is used as a cooling medium for the Large Hadron Collider (LHC) and the superconducting magnets in MRI scanners and NMR spectrometers. It is also used to keep satellite instruments cool and was used to cool the liquid oxygen and hydrogen that powered the Apollo space vehicles.

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Re-Attempt Weekly Quiz Competition

P-Block Elements Test - 3

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P-Block Elements Test - 3

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Question 1

Thortveitite, Phenacite, Willemite

Benitoite, Beryl, Phenacite

Willemite, Zircon, Kaolinite

Phenacite, Willemite, Zircon

Solution

Question 2

Both P and Q

Both P and R

Both P and S

Both Q and S

Solution

Question 3

Both 1 and 2

Both 1 and 4

Both 2 and 3

Both 3 and 4

Solution

Question 4

Both 1 and 2

Both 1 and 4

Both 2 and 3

Both 2 and 4

Solution

Question 5

SO3

H2

O2

S

Solution

Question 6

Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

Between NH3 and PH3, PH3 is a better electron donor because the lone pair of electrons occupies spherical sp3orbital and is more directional.

Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupies spherical sp3orbital and is more directional.

Between NH3 and PH3, PH3 is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

Solution

Question 7

T, T, T

F, F, F

T, T, F

T, F, F

Solution

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SO₃

H₂

O₂

Between NH₃ and PH₃, NH₃ is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies spherical sp³orbital and is more directional.

Between NH₃ and PH₃, NH₃ is a better electron donor because the lone pair of electrons occupies spherical sp³orbital and is more directional.

Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.