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![[Post New]](/templates/default/images/icon_minipost_new.gif) 28 Feb 2008 18:23:57 IST
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1) is it true that undersome condn Mg can reduce SiO2 & si can reduce MgO? under what conditions?????? 2) compound used in soap as antiseptic?? 3) whats ferrocene??? 4) Al significantly electropositive electropositive yet used as structural material? 5) why alpha helix of protein named 3.6 13 helix??????
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TAARA |
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28 Feb 2008 18:52:43 IST
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2)bithinal or also known as bithinol
3)Fe(CO)5
4)in the presence of an oxdn agent,a protective layer of oxide film is formed on the metal which makes it inert.
hope this helps
!!!!!!!!!!!!!!!!!!
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Varsha
be cool,
tomorrow is what we make it today,
so if u can dream it , u can make it .
life is an ice cream ,eat it before it melts away!!!!!!!!!
    
 
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28 Feb 2008 19:11:02 IST
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Ferrocene is an organometallic compound.
It has sandwich structure
Formula :Fe(CO)5
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28 Feb 2008 21:51:46 IST
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ferrocene formula is Fe(C5H5)2 ............ its not Fe(CO)5 .........
IUPAC NAME :::: bis(cyclopentadienyl)iron(II)
above 1693 K ., Si can reduce MgO to Mg
below 1693K , Mg can reduce SiO2 to Si
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28 Feb 2008 21:58:31 IST
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yes it is fairly possible....according to the ellingham diagram, the curves of Gibbs free energy,
for formation of MgO and SiO2 intersect at a particular tempr(sorry i dont hav exact value..but it must sumwhere around 1700K)
and on one of the sides of that intersection point, one of them reduces the other and vicec vers on the other side of curve...
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Na pine ka shouk tha na pilane ka shonk tha. Hume to sirf NAZREIN milane ka shonk tha. Par kya karen hum nazre hi unse mila baithe jinhe nazron se PILANE ka shonk tha. |
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28 Feb 2008 21:59:36 IST
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bithional used in soaps to give antiseptic character
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Na pine ka shouk tha na pilane ka shonk tha. Hume to sirf NAZREIN milane ka shonk tha. Par kya karen hum nazre hi unse mila baithe jinhe nazron se PILANE ka shonk tha. |
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28 Feb 2008 22:11:23 IST
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THAT SIO2 QUES IS GIVEN IN NCERT INTEXT EVEN THE ANSER IS GIVEN AND THE ANSER IS OF AL2O3 LINE IN ELL . DIAGRAM I SUPPOSE IT WRONG NE 1?
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29 Feb 2008 10:44:54 IST
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good work guys
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7 Mar 2008 15:53:03 IST
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alpha helix is called 3.6 13 because in each alpha helical turn there are approximately 3.6 amino acids and hydrogen bonding leads to formation of a 13 membered ring.........
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