Physics-
General
Easy
Question
A particle of mass 1 kg & charge 
is projected towards a non conducting fixed spherical shell having the same charge uniformly distributed on its surface. Find the minimum initial velocity of projection required if the particle just grazes the shell.
- none of these
The correct answer is:
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If the electric potential of the inner metal sphere is 10 volt & that of the outer shell is 5 volt, then the potential at the centre will be :
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physics-General
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All the boron trihalides except B may be prepared by direct reaction between the elements Boron trihalides consist of trigonal - planar BX3 molecules Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and Sol. id states, BF3 and BCl3 are gases, BBr3 3Iis a volatile liquid and B is a Sol. Id Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction : 
However, boron chlorides, bromides and iodides are susceptible (sensitive) to protoly sis by mild proton sources such as water, alcohols and even amines; for example BCl3 undergoes rapid hydrolysis: 
It is supposed that the first step in the above reaction is the formation of the complex 
which then eliminates HCl and reacts further with water
Which of the following is the correct prediction about observed B–X bond length, in BX3 molecules ?
All the boron trihalides except B may be prepared by direct reaction between the elements Boron trihalides consist of trigonal - planar BX3 molecules Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and Sol. id states, BF3 and BCl3 are gases, BBr3 3Iis a volatile liquid and B is a Sol. Id Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction : However, boron chlorides, bromides and iodides are susceptible (sensitive) to protoly sis by mild proton sources such as water, alcohols and even amines; for example BCl3 undergoes rapid hydrolysis: It is supposed that the first step in the above reaction is the formation of the complex which then eliminates HCl and reacts further with water
Which of the following is the correct prediction about observed B–X bond length, in BX3 molecules ?
chemistry-General
chemistry-
Statement-1 : Xenon forms fluorides
Statement-2 : 5 d-orbitals are available in xenon for valence shell expansion
Statement-1 : Xenon forms fluorides
Statement-2 : 5 d-orbitals are available in xenon for valence shell expansion
chemistry-General
