Multiple Choice QuestionsWhich of the ions is colourless inspite of the presence of unpaired electrons ?
La3+
Eu3+
Gd3+
Lu3+
Uncertainty in the position of an electron (mass= 9.1 x 10-31 kg) moving with a velocity 300 ms-1 accurate upon 0.001 % will be (h = 6.63 x 10-34 J-s)
19.2 x 10-2 m
5.76 x 10-2 m
1.92 x 10-2 m
3.84 x 10-2 m
Uncertainty principle is valid for
Proton
Methane
Both (a) and (b)
1 µm sized platinum particles
The energy of an electron is the 3S orbital ( excited state) of H- atom is
-1.5 eV
-13.6 eV
-3.4 eV
-4.53 eV
In the hydrogen atom spectrum, the emission of the least energetic photon takes place during the transition from n = 6 energy level to n = .......... energy level.
1
3
5
4
The threshold frequency of a metal corresponds to the wavelength of x nm. In two separate experiments A and B, incident radiations of wavelengths 1/2x nm and 1/4x nm respectively are used. The ratio of kinetic energy of the released electrons in experiment 'B' to that in experiment 'A' is
1/3
2
4
3
The minimum values of uncertainties involved in the determination of both the position and velocity of a particle respectively are 1 × 10-10 m and 1 × 10-10 ms-1.Then, the mass (in kg) of the particle is
5.270 × 10-15
5.270 × 10-20
5.270 × 10-16
5.270 × 10-10
The number of electrons with azimuthal quantum number l = 1 and l = 2 for Cr in ground state respectively are
12, 5
12, 4
16, 5
16, 4
In which one of the following, d-d transition involves absorption in the ultraviolet region?
[Cu(H2O)4]2+
[Ti(H2O)6]3+
[Co(NH3)6]3+
[Co(CN)6]3-
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