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

11

Mg₆Si₄O₁₀(OH)₈ is commercially known as

A) asbestos B) water-glass C) soda-glass D) zeolite

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Answer & Solution

Answer: Option A

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12

The Lewis acid character of BF₃, BCl₃ and BBr₃ follows the order

A) BF₃ < BBr₃ < BCl₃ B) BCl₃ < BBr₃ < BF₃ C) BF₃ < BCl₃ < BBr₃ D) BBr₃ < BCl₃ < BF₃

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Answer & Solution

Answer: Option C

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13

Which of the following is an arachno borane?

A) [B₆H₆]^2- B) [B₅H₉] C) [B₂H₆] D) [B₆H₁₂]

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Answer & Solution

Answer: Option D

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14

Using chlorobenzene as solvent, the reagents needed for an efficient synthesis of borazine are

A) NH₄Cl and BCl₃ B) NH₄CI and BCl₃ and NaBH₄ C) NH₄Cl and NaBH₃ D) NH₃ and BCl₃

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Answer & Solution

Answer: Option B

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15

BH₃ $$ \cdot $$ CO is more stable than BF₃ $$ \cdot $$ CO because

A) CO is a soft base and BH₃ and BF₃ are soft and hard acids respectively B) CO is a hard base and BH₃ and BF₃ are hard and soft acids respectively C) CO is a soft base and BH₃ and BF₃ are hard and soft acids respectively D) CO is a soft acid and BH₃ and BF₃ are soft and hard bases respectively

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Answer & Solution

Answer: Option A

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16

The number of 'framework electron pairs' present in the borane cluster [B₁₂H₁₂]^2- is

A) 10 B) 11 C) 12 D) 13

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Answer & Solution

Answer: Option D

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17

Triple superphosphate is made by treating phosphate rock with

A) cone. H₂SO₄ B) conc. HNO₃ C) conc. HCl D) cone H₃PO₄

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Answer & Solution

Answer: Option D

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18

The most populated rotational state for HCl (B = 8.5 cm^-1) at 300 K is

A) 2 B) 3 C) 5 D) 7

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Answer & Solution

Answer: Option B

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19

The perxenate ion Xe$${\text{O}}_4^{4 - }$$ can be prepared by

A) direct reaction of Xe with oxygen B) reaction of XeF₆ with oxygen C) hydrolysis of XeF₆ in acidic medium D) hydrolysis of XeF₆ in basic medium

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Answer & Solution

Answer: Option D

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20

BaTi[Si₃O₉] is a class of

A) orthosilicate B) cyclic silicate C) chain silicate D) sheet silicate

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Answer & Solution

Answer: Option B

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