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

1.
The reaction of solid XeF₂ with AsF₅ in 1 : 1 ratio affords

A. XeF₄ and AsF₃

B. XeF₆ and AsF₃

C. [XeF]⁺ [AsF₆]^-

D. [Xe₂F₃] [AsF₆]^-

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2.
The number of hydroxyl (OH) groups present in phosphorus acid is

A. one

B. two

C. three

D. four

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3.
The reaction of ammonium chloride with BCl₃ at 140°C followed NaBH₄ gives product X. The formula of X is

A. B₃N₃H₃

B. B₃N₃H₆

C. B₃N₃H₁₂

D. [BH ... NH]_n

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4.
The first ionization potential of Mg, AI, P and S follows the order

A. Mg < AI < P < S

B. AI < Mg < P < S

C. AI < Mg < S < P

D. Mg < AI < S < P

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5.
Among the following diatomic molecules, the one shows EPR signal, is

A. Li₂

B. B₂

C. C₂

D. N₂

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6.
The Lewis acidity of BF₃ is less than BCl₃ even though fluorine is more electronegative than chlorine. It is due to

A. stronger 2p (B) - 2p (F) σ-bonding

B. stronger 2p (B) - 2p (F) π-bonding

C. stronger 2p (B) - 3p (Cl) σ-bonding

D. stronger 2p (B)- 3p (Cl) π-bonding

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7.
Which one of the following will show closo structure?

A. B₅H₉

B. B₁₂$${\text{H}}_{12}^{2 - }$$

C. B₄H₁₀

D. B₅H₁₁

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8.
The correct classification of [B₅H₅]^2-, B₅H₉ and B₅H₁₁ respectively is

A. closo, arachno, nido

B. arachno, closo, nido

C. closo, nido, arachno

D. nido, arachno, closo

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9.
The order of acidity in boron trihalides is

A. BF₃ > BCl₃ > BBr₃

B. BBr₃ > BCl₃ > BF₃

C. BF₃ > BBr₃ > BCl₃

D. BBr₃ > BF₃ > BCl₃

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10.
Among the following, the group of molecules that undergoes rapid hydrolysis is

A. SF₆, Al₂Cl₆, SiMe₄

B. BCl₃, SF₆, SiCl₄

C. BCl₃, SiCl₄, PCl₅

D. SF₆, Al₂Cl₆, SiCl₄

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

1. The reaction of solid XeF2 with AsF5 in 1 : 1 ratio affords

Answer & Solution

2. The number of hydroxyl (OH) groups present in phosphorus acid is

Answer & Solution

3. The reaction of ammonium chloride with BCl3 at 140°C followed NaBH4 gives product X. The formula of X is

Answer & Solution

4. The first ionization potential of Mg, AI, P and S follows the order

Answer & Solution

5. Among the following diatomic molecules, the one shows EPR signal, is

Answer & Solution

6. The Lewis acidity of BF3 is less than BCl3 even though fluorine is more electronegative than chlorine. It is due to

Answer & Solution

7. Which one of the following will show closo structure?

Answer & Solution

8. The correct classification of [B5H5]2-, B5H9 and B5H11 respectively is

Answer & Solution

9. The order of acidity in boron trihalides is

Answer & Solution

10. Among the following, the group of molecules that undergoes rapid hydrolysis is

Answer & Solution

1.
The reaction of solid XeF₂ with AsF₅ in 1 : 1 ratio affords

2.
The number of hydroxyl (OH) groups present in phosphorus acid is

3.
The reaction of ammonium chloride with BCl₃ at 140°C followed NaBH₄ gives product X. The formula of X is

4.
The first ionization potential of Mg, AI, P and S follows the order

5.
Among the following diatomic molecules, the one shows EPR signal, is

6.
The Lewis acidity of BF₃ is less than BCl₃ even though fluorine is more electronegative than chlorine. It is due to

7.
Which one of the following will show closo structure?

8.
The correct classification of [B₅H₅]^2-, B₅H₉ and B₅H₁₁ respectively is

9.
The order of acidity in boron trihalides is

10.
Among the following, the group of molecules that undergoes rapid hydrolysis is