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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

cross linked silicones only

The silicon containing residual hydroxyl groups will be cross linked using boric acid this tri functional acid, B(OH)₃ groups, forms -Si- O - B linkage between siloxane chains.

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.

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378. How does ammonia react with a solution of Cu²⁺?

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379. What is the covalency of nitrogen in N₂O₅?

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380. Bond angle in PH₄⁺ is higher than that in PH₃. Why?

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