Atomic Structure · Chemistry · AP EAPCET
MCQ (Single Correct Answer)
The wavelength associated with the electron moving in the first orbit of hydrogen atom with velocity $$2.2 \times 10^6 \mathrm{~ms}^{-1}$$ (in nm) is
$$\left(m_e=9.0 \times 10^{-31} \mathrm{~kg}, h=6.6 \times 10^{-34} \mathrm{Js}\right)$$
The energy required (in eV) to excite an electron of H -atom from the ground state to the third state is
The maximum number of electrons present in an orbital with $$n = 4, l = 3$$ is
Which quantum number provides information about the shape of an orbital?
If $$\Delta x$$ is the uncertainty in position and $$\Delta v$$ is the uncertainty in velocity of a particle are equal, the correct expression for uncertainty in momentum for the same particle is
The number of radial nodes and angular nodes of a $$4 f$$-orbital are respectively
The number of protons, neutrons and electrons in $$_6^{13}$$C respectively are
The masses of an electron, a proton and a neutron respectively will be n the ratio
Match the following species with the correct number of electrons present in them.
| Species | Number of electrons | ||
|---|---|---|---|
| A. | Be$$^{2+}$$ | (i) | 0 |
| B. | H$$^+$$ | (ii) | 10 |
| C. | Na$$^+$$ | (iii) | 2 |
| D. | Mg$$^+$$ | (iv) | 11 |
| (v) | 4 |
Assuming that the incident radiation is capable of ejecting photoelectrons from all the given metals, the lowest kinetic energy of the ejected photoelectron is observed with which of the given metals?
If the energies of two light radiations $$E_1$$ and $$E_2$$ are $$25 \mathrm{~eV}$$ and $$100 \mathrm{~eV}$$ respectively, then their respective wavelengths $$\lambda_1$$ and $$\lambda_2$$ would be in the ratio $$\lambda_1: \lambda_2$$
If two particles A and B are moving with the same velocity, but wavelength of A is found to be double than that of B. Which of the following statement is correct?
The spectrum of helium is expected to be similar to that of
On the basis of Bohr’s model, the radius of the 3rd orbit is