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The p-Block Elements

Multiple Choice Questions

371.

CO is poisnous gas, antidote for CO poisoning is

carborundum
carbogen
corbonic acid
pure oxygen

372.

Moderate electrical conductivity is shown by

silica
graphite
diamond
carborundum

373.

Hydrolysis of (CH₃)₂SiCl₂ and CH₃SiCl₃ leads to:

linear chain and cross linked silicones respectively
cross linked and linear chain silicones respectively
linear chain silicones only
cross linked silicones only

Short Answer Type

374. Why are pentahalides more covalent than trihalides?

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375. Why is BiH₃ the strongest reducing agent amongst all the hydrides of Group 15 elements?

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376. Why is N₂ less reactive at room temperature?

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377. Mention the conditions required to maximise the yield of ammonia.

Ammonia is prepared using the Haber’s process. The yield of ammonia can be maximized under the following conditions:
(i) Temperature ~ 700k.
(ii) High pressure of 200 x 10⁵ Pa (about 200 atm).
(iii) A catalyst such as iron oxide with small amounts of K₂,O and Al₂O₃.

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