8
6
4
2
If and be the threshold wavelength and wavelength of incident light, the velocity of photoelectron ejected from the metal surface is :
As discussed in the concept
Photoelectric Effect 
 wherein
where
m is the mass of the electron
u is the velocity associated with the ejected electron.
h is plank’s constant.
v is frequency of photon,
v_{0}^{ }is threshold frequency of metal.
Hence the correct option is 3
Option 1)
Option 2)
Option 3)
Option 4)
Chloro compound of Vanadium has only spin magnetic moment of 1.73 BM. This Vanadium chloride has the formula :
(at. no. of V=23)
VCl_{2}
VCl_{4}
VCl_{3}
VCl_{5}
As discussed in
Magnetic Quantum Number (m) 
It gives information about the spatial orientation of the orbital with respect to standard set of coordinate axis.

The value of magnetic moment is 1.73 BM
where n is the number of unpaired electrons
After calculation n = 1
To obtain one unpaired electron V should be tetrapositive ion and the formula of its chlorid should be
Option 2 is correct
Option 1)
VCl_{2}
Incorrect option
Option 2)
VCl_{4}
Correct option
Option 3)
VCl_{3}
Incorrect option
Option 4)
VCl_{5}
Incorrect option
The energy absorbed in the transition of the electron from n=2 to 1 in Hatom will be
10.2 meV
3.4 meV
13.6 meV
12.75 meV
Element with electronic configuration belongs to which group of the periodic table?
3rd
15th
7th
2nd
The number of quanta of radiations of HZ that must be absorbed in order to melt 5g of ice is (the energy required to melt 1g of ice is 333 J)
Zero group was introduced by
Lothar Meyer
Lockyer
Mendeleev
Ramsay
Which pair of elements belongs to same group
Elements with atomic No. 17 and 28
Elements with atomic No. 20 and 40
Elements with atomic No. 17 and 53
Elements with atomic No. 11 and 33
Which of the following, the highest oxidation state is achieved by:
Which of the following options does not represent ground state electronic configuration of an atom?
Which of the following is not correctly matched?
Which of the following is Dobereiner triad?
Cl, Br, I
Zn, Cr, Na
Ne, Ar, K
B, C, Si
Which is not arranged in the correct sequence?
decreasing basic strength
increasing magnetic moment
 Increasing number of oxidation states
 Increasing stability
Which electronic configurations represent to a transition element?
The wavelength of a ball of mass 1kg moving with a velocity of ?
The wave number of the spectral line corresponding to the transition from is
20565 per m
205.65 per cm
20565 per cm
205.65 per m
The ratio of the energy of the electron in the ground state of hydrogen to the electron in the first excited state of is
1:4
1:8
1:16
16:1
The photoelectric effect was not observed for
Potassium
Rubidium
Lithium
Caesium
The number of photons of light with the wavelength of 4000 pm that provides 1 J of energy is
The maximum number of emission lines when the excited electron of an H atom in n=5 drops to the ground state?
15
10
20
5