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
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
The photoelectric effect was not observed for
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?
The maximum KE of the photoelectron is found to be , when the metal is irradiated with a radiation of frequency . The threshold frequency of the metal is about
The incorrect order of energy of following orbitals is
3s < 3p < 4s < 4d
5p < 5d < 5f < 6p
7s < 5f < 6d < 7p
4d < 5p < 6s < 4f < 5d
The energy of one mole of photons of radiation whose frequency is
The elements X, Y, Z and J have the indicated electron configurations starting with the innermost shell. The most metallic element is:
X = 2,8,3
Z= 2, 8, 8, 1
J = 2, 8, 8, 7
The element whose electronic configuration is is