Problems with Solutions 

True and False

Problem:

All electromagnetic radiations have same energy.

Solution:
False.

Different electromagnetic radiation have different wavelengths, hence different energy

 

Problem:

Bohr’s model is applicable for H-atom only.

Solution:

False.

Bohr’s model is applicable for species having one electron like H, He+, Li2+.

 

Problem:

Specific charge of cathode rays remains same irrespective of the gas used in the discharge tube.

Solution:

True.

Cathode rays contain electrons which remains same with every gas.

 
Problem:

Isoelectronic species have same electronic configuration.

Solution:
True.

Isoelectronic species have same number of electrons.

 
Problem:

Atoms with same atomic number but different number of neutrons are called isotopes.

Solution:

True.

Isotopes have same atomic number but different atomic mass. 

 
Fill in the Blanks 
Problem:

The mass of positron is ___________ electron.

Solution:

Equal to
 
 
Problem:

With increasing principle quantum number, the energy difference between adjacent energy levels in H-atom _________.

Solution:
Decreases
 

Problem:

If the magnetic moment of an ion An+ is 5.9, then the number of unpaired electrons present in An+are ____________

Solution:

Five. Applying µ = √n(n+2), where n = 5

 
Problem:

s-electrons are more penetrating than p-electrons. The energy required to abstract s-electrons is ____________ than for p electrons.

Solution:
Greater
 

Problem:

The wavelength of the first spectral line in Paschen series for H-atom is____________

Solution:
16410 Å
For Paschen seriesn2=4, n1 = 3
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