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In BF3 molecule with three bonds to fluorine (sp2 hybridization), and no lone pairs, there remains one 2p-orbital that is not hybridized and empty. Also, fluorine is highly electronegative, withdrawing electron density from the boron atom.Hence BF3 is a good acceptor of electrons and therefore a good Lewis acid.
NH3 has a lone pair of electrons and acts as a lewis base.It donates its lone pair of electrons to BF3.
This reaction fills BF3's empty 2p-orbital, and now boron is sp3 hybridized when previously as BF3 it was sp2 hybridized. NH3 is also sp3 hybridized.
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Bhargavi is perfect.
Ruhi answer cannot be negative.
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A fluid cannot be liquified above its critical temperature because heat increases the molecular motion in the fluid.
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I could not understand your question.
If its simply ax as x tends to infinity then the limit depends on a.
If |a| < 1 then it is zero.
It is 1 only if a = 1.
It would be convinient if you repost your query.
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If you want complete description then use J D Lee and consolidate the topics which are in syllabus. Otherwise you can use O P Agrawal and Arihant's Inorganic Chemisrty.
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After hitting the wall it returns with a velocity of ewr = wr/2
Let at time t it starts pure rolling
v' = v - (f/m)t = wr/2 - (f/m)t
w' = -w + (f.r/I)t
Eliminating t we get
(5/2r)(wr/2 - v') = w' + w
(5/2)(w/2 - w') = w' + w (since v' = w'r)
w' = w/14
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Refer to the link :
http://www.glenbrook.k12.il.us/GBSSCI/PHYS/mmedia/energy/ce.html
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Gamma function is defined as :
f(x) = 0 infinity e-t.tx.dt
Some of its properties :
 (n) = (n-1)! n = 1,2,3,4............
(x+1) = x(x)
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Chemical reaction is balanced for conservation of mass.
As there no atoms generated or destroyed, hence the no. of atoms of a particular element should be equal in LHS and RHS of a reaction.
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Beacuse sodium lies in alkali group(basic) and when they are disslolved in water have a pH of greater than 7 while Cu is a transition metal.
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Oxygen is the antidote for carbon monoxide. Fresh air is the main treatment for very mild cases of carbon monoxide in healthy people. As you breathe in fresh air, you are also breathing out carbon monoxide. For more serious cases, oxygen is administered at the hospital to increase the elimination of the carbon monoxide from the body. People with heart disease or serious exposures need heart monitoring or an electrocardiogram to make sure the heart has not been injured. Hyperbaric oxygen may be used in critical cases.
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I had posted it. Refer to the link :
http://www.goiit.com/posts/list/5265.htm
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See if the function is only increasing or only decreasing then f'(x) is either negative or positive throughout and hence discriminant is always less than zero.
Hope u understood now.
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Split a+b+c in a/2+a/2+b/3+b/3+b/3+c/4+c/4+c/4+c/4
Now using AM>=GM
(a+b+c)/9 >= (a/2xa/2xb/3xb/3xb/3xc/4xc/4xc/4xc/4)1/9
a2b3c4 <= (18/9)9223344
a2b3c4 <= 426384
Hence maximum value of a2b3c4 is 426384
In such type of problems greatest value can be found by taking ratios of a,b,c powers.
a:b:c: = 2:3:4
a+b+c=18
a=4 b=6 c=8
a2b3c4 = 426384 (maximum value)
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Manasi has explained it. C-D has higher bond energy and C-H has comparably lower bond energy, so C-H bond will break.
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