Frequently Asked Questions by Members

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• sir, my date of birth is 19/01/1987 i want to appear 2011 iit exam help me to that i am suitable or not.
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• How to find the rate of complex reaction as per rate law?
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• explain last example....
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• how we can find the efficiency of hexagonal closed packing ?
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• since according to simplification into partial fractions :-
  
  1/ (x-a)(x-b)^2(x^2 - 1)  =  A/(x-a)   +   B/(x-b)^2    +   Cx+D/ x^2 - 1.
  
  we take cx+d because the degree of denominator is 2 ,
  
  but we take only B while it's denominator has a degree of 2 .
  
  why ?
  
  
  [note : ^ denotes exponent ] 
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• sir,
  how to factorize a cubic and biquadratic equation ?
  
  please tell me a easy method because i am not able to solve many questions of PCM due to this problem.
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• Why is the dipole moment of CH3F less than CH3Cl?
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• What is the name of the valance atomic orbitals of carbon in silver acetylide?
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• differentiate
  tan^-1 {[sqrt(x) - sqrt(a)] / [1- sqrt(xa)]}
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• differentiate; tan x^o w.r.t x
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• What is the differentiation of 2^[x] w.r.t. x if x ε [-3,-2] and [ ] stands for greatest integer function
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• Phospine on decomposition produces phosphorus and hydrogen . When 100ml of phospine is decomposed the change in volume under laboratory conditions is
  A) 50ml increase 2) 50ml decrease 3)90ml decrease 4)75ml increase
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• 0.36g of an organic compound on combution gave 1.1g of CO₂ and 0.54g of H₂O. what are the percentages of carbon and hydrogen in the compound?
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• The mass of water (in grams) in one mole of crystilline hypo is_________?
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• The number of molecules in KI rerequired to prodece 0.4 moles K₂HgI₄ are______________   ?
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• Can we predict the structure of C2H4 molecule using VSEPR theory like in CH4 molecule.
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• Why do we show in some cases a co-ordination bond between Phosphorous and Oxygen and in some cases a double bond between Phosphorous and Oxygen.
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• prove
                          b+c      c+a      a+b                                    a    b    c
  determinant       q+r       r+p      p+q        =   2*determinant   p    q    r
                          y+z       z+x      x+y                                     x     y    z
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• prove that
  determinant            b²+c²      ab          ac
                               ab         c²+a²       bc           = 4a²b²c²
                               ca            cb       a²+b²    
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• if a vector is going in circular form can the magnitude of a vector at any point on the circle be equal to the other vector magnitude at any point on the circle except the point at which the fist vector is observed?
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