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Test: Structure of Atom - 2 - Question 1

Most penetrating radiation of radioactive element is:

Detailed Solution for Test: Structure of Atom - 2 - Question 1

Alpha rays as the least penetrating, followed by beta rays, followed by gamma rays as the most penetrating. 

Test: Structure of Atom - 2 - Question 2

For a hypothetical H like atom which follows Bohr's model, some spectral lines were observed as shown. If it is known that line 'E' belongs to the visible region, then the lines possibly belonging to ultra violet region will be (n1 is not necessarily ground state)          

 [Assume for this atom, no spectral series shows overlaps with other series in the emmission spectrum]  

         

Detailed Solution for Test: Structure of Atom - 2 - Question 2

In the given figure if line 'E' is in visible region then line belonging to ultraviolet region will have more energy than 'E' i.e. line A

Test: Structure of Atom - 2 - Question 3

The number of photons emitted in 10 hours by a 60W sodium lamp (λ, of photon = 6000 Å)           

    [Take he = 12400 EvÅ, h = Planck's constant, c = speed of light]

Detailed Solution for Test: Structure of Atom - 2 - Question 3

Test: Structure of Atom - 2 - Question 4

Radius of 3rd orbit of Li2+ ion is ‘x’ cm then de-broglie wavelength of electrons in the 1st orbit is

Detailed Solution for Test: Structure of Atom - 2 - Question 4

Test: Structure of Atom - 2 - Question 5

Ratio of frequency of revolution of electron in the second state of He revolution of electron in the second state HeΘ and second state of hydrogen is

Detailed Solution for Test: Structure of Atom - 2 - Question 5

Test: Structure of Atom - 2 - Question 6

In any subshell, the maximum number of electrons having same value of spin quantum number is:         

Detailed Solution for Test: Structure of Atom - 2 - Question 6

Maximum number of electron having same spin quantum number is equal to the number of orbitals = 

Test: Structure of Atom - 2 - Question 7

A proton accelerated from rest through a potential difference of 'V' volts has a wavelength λ associated with it. An alpha particle in order to have the same wavelength must be accelerated from rest through a potential difference of         

Detailed Solution for Test: Structure of Atom - 2 - Question 7

Test: Structure of Atom - 2 - Question 8

Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers,  = 1 and 2 are, respectively:        

Detailed Solution for Test: Structure of Atom - 2 - Question 8

Sol.    = 1 p and  = 2 for d.

 Now Cr has configuration

1s2 2s2 2p6 3s2 3p6 3d5 4s1

Hence there are 12, p-electrons and 5, d-electrons

Test: Structure of Atom - 2 - Question 9

Number of electrons having l + m value equal to zero in 26Fe may be           

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Test: Structure of Atom - 2 - Question 10

A photon of 4000  is used to break the iodine molecule, then the % of energy converted to the K.E. of iodine atoms if bond dissociation energy of I2 molecule is 246.5 kJ/mol is:

Detailed Solution for Test: Structure of Atom - 2 - Question 10

Energy of one photon
Energy supplied by one mole photon in KJ/mole = 3.11×6×10−19×6×1023×10−3=297KJ/mole
% of energy converted to K.E.= 

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