Silicones are organosilicon polymeric compounds containing repeated R2SiO units and (-Si-O-Si-) linkage.The name is given silicone because their empirical formula is analogous to that of ketones (R2CO). Silicones may have the cyclic structure also having 3, 4, 5 and 6 nos. of silicon atoms within the ring. Alcohol analogue of silicon is known as silanol.
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Wednesday, February 12, 2020
What is "calgon" ? Give structure and its uses?
Hexamer of meta phosphoric acid exist as sodium salt which is called sodium metaphophate or sodium polymetaphosphate and it is commercially known as "CALGON" and use as water softener.
Related Questions:
Topic:
15th Group : NITROGEN FAMILY
Why bond angle of hydrides of group 15, decreases down the group?
Hydride: NH3 >
PH3 > AsH3 >SbH3
H-M-H angle: 107 > 92 > 90
> 91 (Degree)
This is due to the decrease in electronegativity
of the central atom of hydride. As the electronegativity decrease the electrons
which were more close to central atom at lower hydrides tends to more far from
it and bp-bp repulsion
decreases.Related Questions:
Which is more basic N(CH3)3 or N(SiH3)3 , explain?
Topic:
15th Group : NITROGEN FAMILY
Why liquification of noble gases is quite difficult?
liquification of noble gases is quite difficult.It is due to the fact that there are only weak vander waal's forces which hold atoms together, but due to increase in these forces down the group the ease for liquification increases down the group.
Topic:
18th Group NOBLE GASES:
Tuesday, February 11, 2020
What are "pyro" oxy acids?
The term "Pyro" use for those oxy acid which are formed by
removal of one water molecule from two molecules of same oxy acid and resulting
product is also an oxy acid then the product acid is named with prefix "Pyro"
For Examples:
H3BO3 (√), H2CO3 (√), H4SiO4 (√), HNO3 (×), HPO3 (√), HPO4 (√), H2SO4 (√), HCl4 (×)
(×) "Pyro" form not possible.
(√) "Pyro" form possible.
(1) In general those oxy acids are formed “pyro” acid which contains
atleast two hydrogen atoms.
(2) In general all the “pyro” oxy acids contain
oxy-linkage except "Pyro sulphurous acid"
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