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Showing posts with label 16th Group: CHALCOGEN FAMILY:. Show all posts
Showing posts with label 16th Group: CHALCOGEN FAMILY:. Show all posts

Thursday, October 8, 2020

What is the structure of "Methylcyclotrisilicone" ?

Important fact: that cyclic trimer of Methyltrisilicone [(CH3)6SiO3] is isoelectronic with of timer of SO3 (S3O9),Si3O9-6,P3O9-3    and contains 120 electrons.

Related Questions:






What are the number of sigma bond, pi-bond and lone pair in the lewis dot structure of SO3 ?

SO3 Molecule contains 3-sigma bonds, 3-pi bonds and 6-pairs of lone pairs which are 2-lone pairs on each oxygen atoms , Sulphur atom has no lone pair.
 
Related Questions:

Monday, February 10, 2020

What are the structure of cyclic trimer of SO3 , Methylcyclotrisilicone, Cyclotrimetaphosphate and cyclotrisilicate ion ?

What are structures of SO3 in gas phase as well as solid phase ( at room temperature)?

In gas phase sulphur atom of SO3 has sp2 hybridized and trigonal structure. In which three sigma bond give rise to trigonal planer shape and three delocalized π-bond, out of three π-bond one is pπ-pπ bond and another two are pπ-dπ bond.

In solid phase SO3 exist at room temperature and have two different structures.
Important fact that cyclic trimer of SO3 (S3O9) is also isoelectronic with P3O9-3 and contains 120 electrons.

Structure of Si3O9-6

Structure of P3O9-3

Related Questions:



Sunday, February 9, 2020

Why thionyl chloride behaves as Lewis acid as well as Lewis base?.


Hybridization of sulphur in SOCI2 is sp3 having three bond pair and one lone pair.
Lewis base character is due to the presence of a lone pair of electrons. In SOCl2, the central atom sulphur atom has vacant d orbitals. Hence it can accept electron pairs. Therefore it can behave as a Lewis acid.

Related Questions:

Why SF6 is known but SCl6 is not ? Explain.


Sulphur is a small atom. Hence it can accommodate six small fluorine atoms around it. While size of Chlorine is larger than fluorine, thus S cannot accommodate six large chlorine atoms around it. Moreover, because of low electronegativity of Cl, it cannot easily oxidized sulphur to form S(VI). Hence SCl6 cannot easily form and stable.

Related Questions:

Question (1): Why aqueous solution of AlCl3 is acidic in nature?

Question (2): What happen when aq AlCl3 react with Acid or Base?

Question (3): Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?

Question (4): Arrange in increasing order of extent of hydrolysis [ CCI4, MgCI2, AICI3, PCl5, SiCI4].

Question (5): Although Sulphur contain vacant d-orbital but SF6 does not undergo hydrolysis. Why?

Question (6): CCl4 can not be hydrolysed but SiCl4 can be. Why?

Question (7): What are the hydrolysis products of urea?

Question (8): Why SF6 is inert where as SF4 is highly reactive towards H20?.

Question (9): Why SF6 behaves inert towards hydrolysis?

Question (10): Why PCl3 hydrolysed while NCl3 can not be hydrolysed?

Question (11): Why hydrolysis of NCl3 gives NH4OH and HOCl, while PCl3 on hydrolysis gives H3PO3 and HCl?

Question (12) NCl3 and PCl3 on hydrolysis give different kinds of products. These is because of

Why SF6 is inert where as SF4 is highly reactive towards H20 ?.


The maximum coordination number of sulphur is 6. Hence S cannot accommodate more than 12 electrons around it. SF6 is covalently saturated compound. Thus six fluorine atoms around sulphur protect sulphur from attack by reagent to such an extent that even thermodynamically favorable reaction like hydrolysis (S-O bond is stronger than S-F bond) does not occur. On the other hand, in SF4, the coordination number is only four. Hence sulphur can be attacked by H2O.


Related Questions:

Question (1): Why aqueous solution of AlCl3 is acidic in nature?

Question (2): What happen when aq AlCl3 react with Acid or Base?

Question (3): Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?

Question (4): Arrange in increasing order of extent of hydrolysis [ CCI4, MgCI2, AICI3, PCl5, SiCI4].

Question (5): Although Sulphur contain vacant d-orbital but SF6 does not undergo hydrolysis. Why?

Question (6): CCl4 can not be hydrolysed but SiCl4 can be. Why?

Question (7): What are the hydrolysis products of urea?

Question (8): Why SF6 is inert where as SF4 is highly reactive towards H20?.

Question (9): Why SF6 behaves inert towards hydrolysis?

Question (10): Why PCl3 hydrolysed while NCl3 can not be hydrolysed?

Question (11): Why hydrolysis of NCl3 gives NH4OH and HOCl, while PCl3 on hydrolysis gives H3PO3 and HCl?

Question (12) NCl3 and PCl3 on hydrolysis give different kinds of products. These is because of

Saturday, February 1, 2020

What is oil of vitriol ?


Concentrated sulphuric acid is a dense and  oily liquid which is also known as oil of vitriol.  Concentrated sulphuric acid has a specific gravity of 1.84 and a boiling point of 611 K. The high boiling point and high viscosity indicate that sulphuric acid has associated structure due to hydrogen bonding as shown below:
The concentrated acid is soluble in water and the dissolution process is highly exothermic. So acid is always diluted by adding acid to the water slowly and not by adding water to acid. This is done because in the later case, lot of heat is produced which causes the acid to spurt out of the container.