
Nitrogen at bridgehead act as lewis base but how?? If nitrogen will give its lone pair then positive charge will appear on bridgehead and it will become sp2 which is not possible... Then how?? ...

lake cayuga has a volume of water estimated to be 8.2 X 10^12 L.a power station not so far above cayuga waters produces electricity at the rate of 1.5 X 10^6 coulomb/sec at an appropiate voltage ...how long would it take to e ...

64 players play in a knockout tournament. Assuming all players are of equal strength, probabilty that P1 loses to P2 and P3 becomes eventual winner is? ...

benzene and toluene form nearly ideal solutions.at 300K pÂ°toluene=32.06mm and pÂ°benzene=103.01mm. a liquid mixture is composed of 3 mole of toluene and 2 mole of benzene.if the presurre over mixture is reduced,at what press ...

K2Pt+4Cl6 is well known compound and corresponding Ni4+ Salt it unknown ? Whereas Ni+2 is more stable than Pt+2. Give Proper Explanation . ...

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A cube of mass 2kg is held stationary against a rough wall by a force F=40N pass through centre C.Find perpendicular distance of normal reaction between wall and cube from point C.Side of the cube is 20cm. *Image* ...

A rod OA of mass 4 kg is held in horizontal position by a massless string AB as shown in the figure,Length of the rod is 2 m .Find : a.tension in the string b.net force exerted gy the hingre on the rod *Image* ...

*Image* a system consists of two cubes of masses m1 & m2 respectively connected by a spring of force constant k . find the force (F) that should be applied to the upper cube for which the lower one justs lift after the force ...

a ray of light is incident on concave mirror . it is parallel to principal axis and its height from principal axis is equal to focal length of mirror. the ratio of distance of point B to distance of the focus from centre of c ...

Q In the potentiometer circuit shown,the balance point is at X.State with reason where the balance point be shifted when: 1)resistance R is increased keeping all other parameters unchanged 2)resistance S is increased keeping ...

i still can't figure out the following questions . Please help... 1.A long capillary tube of mass Î gram, radius 2mm and negligible thickness is partially immersed in a liq of surface tension 0.1N/m, The angle of contact =0 a ...

Given: Ag(NH3)2 1Ag+2NH3, Kc=6.2*10^8 and Ksp of AgCl=1.8*10^10 at 298K. if ammonia is added to water solution containing excess of Agcl(s) only .Calculate the concentration of complex in 1M aqueous ammonia ...

Q. densities of diamond and graphite are 3.51 and 2.25 g/cc respectively. increase in pressure on equilibrium C(diamond) <> C(graphite) (A) favours forward rkn (b) " back " (c) no effect (d) increases rkn rate ...

Three identical balls are connected by light inextensible strings with each other as shown and rest over a smooth horizontal table. At the moment t=0, ball B is imparted a velocity. Calculate the velocity of A when it collide ...

*Image* A mass of 1 kg is suspended by a string A . ANother string C is connected to its lower end[ See fig). if a sudden jerk is given to C , then a) the portion AB of the string will break b)the portion BC of the string wil ...

A thin convex lens whose focal length in air is known to be 30cm is cut into two parts by a transverse plane parallel to principal axis and 0.5cm above the principal axis. They are placed on the xaxis a shown in the figure.A ...

Q. A hammer of mass M falls from a height h repeatedly to drive a pile of mass m into the ground. The hammer makes the pile penetrate in the ground to a distance d in single blow. Opposition to penetration is given by? ...

Let 2x2+y23xy=0 be the equation of a pair of tangents from origin O to a circle of radius 3 with center in the first quadrant. If A is one of the points of contact, Find the length OA ...

The aqueous solution with the lowest freezing point is (1) 0.01 m glucose (2) 0.01 m KCl (3) 0.01 m BaCl2 (4) 0.01 m K4[Fe(CN)6]? With explanation please.thanks ...

Light of wavelength 4000 Ao is incident at small angle on a prism of apex angle 4o The prism has nv = 1.5 & nr = 1.48. The angle of dispersion produced by the prism in this light is ? A)0.2o B) 0.08o C)0.192o D)None of these ...

Number of unhybridised orbitals in vinyl acetylene are (A) 2 (B) 3 (C) 4 (D) 6 ...

A lift performs the first part of its ascent with uniform acceleration a and the remaining with uniform retardation 2a.If t is the time of ascent,find the depth of the shaft. (a) at2/4 (b) at2/3 (c) at2/2 (d) at2/8 (According ...

wat is phenoxide moiety?????? ...

hello!! i am nearly a starter in ORGANIC CHEMISTRY!! i am presently using a book ORGANIC CHEMISTRY ARIHANT PUBLICATIONS... Is this book good enough??I mean which is the best book to use to gain best and clearest theoritical c ...

Q: A ball hits the floor and rebounds after an inelastic collision. In this case, a) the momentum of the ball just after collision is the same as that before collision. b) the mechanical energy of the ball remains same during ...

d arithmetic mean of d roots of d equatio n 4Cos3x 4Cos2x Cos[315pie+x]=1 ...

*Image* A finite ladder is constructed by connectiong several sections of 2uF and 4uF capacitors combination as shown. IT is terminated y a Capacitor of C...wht should be the value oif C...so that the equivalent capacitence o ...

a block of mass m produces an extension of 9cm in an elastic spring of length 60cm when it is hung by it, and the system is in equilibrium. the spring is cut in two parts of 40cm and 20cm lengths, the same block hangs in equi ...

Q1. Two ships A and B originally at a distance d = 3 km from each other depart at the same time from a straight coastline. Ship A moves along a straight line perpendicular to the shore while ship B constantly heads for ship A ...