S-Block and P-Block Elements MCQs Question and Answer in Engineering Chemistry

21

The reagents required for the synthesis of cyclic phosphazene N₄P₄Cl₈ are

A) PCl₅ and NH₃ B) POCl₃ and NH₄Cl C) POCl₃ and NH₃ D) PCl₅ and NH₄Cl

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Answer & Solution

Answer: Option D

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22

Which of the following statements is/are true for X?
i. X is not isoelectronic with benzene.
ii. X undergoes addition reaction with HCI.
iii. Electrophilic substitution reaction on X is much faster than that of benzene.
iv. X undergoes polymerization at 90°C

A) i and ii B) ii only C) ii and iii D) i and iv

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Answer & Solution

Answer: Option B

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23

The overall charge present on the cyclic silicate anion [Si₆O₁₈]^n- is

A) 6 B) 12 C) 18 D) 24

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Answer & Solution

Answer: Option B

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24

Pyroxenes are class of silicate minerals, which exhibit a polymeric chain structure, as shown below
S-Block and P-Block Elements mcq question image

S-Block and P-Block Elements mcq question image

Its simplest repeating unit is

A) [SiO₄]^4- B) [SiO₃]^2- C) [Si₂O₇]^6- D) [Si₄O₁₁]^6-

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Answer & Solution

Answer: Option B

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25

Using the Wade rule, the structure of B₁₀C₂H₁₂ can be predicted. The structure and the number of isomers of B₁₀C₂H₁₂ respectively, are

A) nido are two B) closo and three C) nido and one D) closo and two

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Answer & Solution

Answer: Option B

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26

According to Wade's rule, the structures of B₁₀C₂H₁₂ and [B₉C₂H₁₁]^2- respectively are

A) closo and arachno B) nido and closo C) closo and nido D) nido and arachno

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Answer & Solution

Answer: Option C

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27

White phosphorus, P₄ belongs to the

A) closo system B) nido system C) arachno system D) hypho system

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Answer & Solution

Answer: Option B

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28

Match the silicate minerals (Column I) with their compositions (Column II) and order of hardness (Column III)

Column I	Column II	Column III
P. Talc	U. KAl₂AlSi₃O₁₀(OH)₂	X. High
Q. Muscovite	V. Mg₃Si₄O₁₀(OH)₂	Y. Low
R. Margarite	W. CaAl₂AlSi₃O₁₀(OH)₂	Z. Intermediate

A) P, V, Y - Q, U, Z - R, W, X B) P, U, X - Q, V, Z - R, W, Y C) P, W, X - Q, V, Y - R, U, Z D) P, V, Z - Q, U, Y - R, W, X

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Answer & Solution

Answer: Option A

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