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Published on: 21/06/2021
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Questions + Answers key
Take MCQ Chemistry Test1.
What is phosgene? How is it prepared?
2.
What is burnt alum?
3.
What are the uses of boron trifluoride?
4.
Mention the physical properties of boranes.
5.
Explain the formation of boron trifluoride.
1.
When carbon monoxide is treated with chlorine in presence of light or charcoal, it forms a poisonous gas carbonyl chloride, which is also known as phosgene.
CO + Cl2 ⟶ COCl2
2.
On heating to 475 K potash alum loses water of hydration and swells up. The swollen mass is known as burnt alum.
3.
(i) Boron trifluoride is used for preparing HBF4, a catalyst in organic chemistry
(ii) It is also used as a fluorinating reagent.
4.
(i) Boranes are colourless diamagnetic compounds with low thermal stability.
(ii) Diborane is a gas at room temperature with sweet smell and it is extremely toxic.
(iii) It is also highly reactive At high temperatures it forms higher boranes liberating hydrogen.
5.
(i) Boric acid reacts with calcium fluoride in presence of conc. sulphuric acid and gives boron trifluoride.
3CaF2 + 3H2SO4 + 2B(OH)3 ⟶ 3CaSO4 + 2BF3 + 6H2O
(ii) Borax when heated with soda ash it gives borax
Na2CO3 + 4B(OH)3 ⟶ Na2B4O7 +.CO2 + 6H2O
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