## MCQ (Single Correct Answer)

Which of the following statements is NOT true about Bohr atomic model?

Which from following elements is isoelectronic with $$\mathrm{Na}^{+}$$?

Which from following equations is used to express the angular momentum of an electron in a stationary state?

Which emission transition series is obtained when electron jumps from $$\mathrm{n}_2=\infty$$ to $$\mathrm{n}_1=1$$ ?

What is the radius of fourth orbit of $$\mathrm{Be}^{+++}$$ ?

What is angular momentum of an electron in fourth orbit of hydrogen atom?

Which of the following species is NOT isoelectronic with neon?

Identify the physical quantity that is measured in Candela.

Identify degenerate orbitals from following for hydrogen atom.

Which of the following statements is NOT true about Rutherford atomic model?

What is the wave number of photon emitted during transition from orbit, $$\mathrm{n}=4$$ to $$\mathrm{n}=2$$ in hydrogen atom $$\left[R_H=109677 \math...

Which from following rule / principle states that "No two electrons in an atom can have the same set of four quantum numbers"?

Calculate the wavenumber of the photon emitted during transition from the orbit of $$n=2$$ to $$n=1$$ in hydrogen atom. $$\left[R_H=109677 \mathrm{~cm...

What is the wavelength for a wave having frequency 50 Hz?

The wavelength of a spectral line of caesium is $$460 \mathrm{~nm}$$. What is the frequency of spectral line?

What is the value of frequency of radiation when transition occurs between two stationary states that differ in energy by $$\Delta \mathrm{E}$$ ?...

Identify an orbital with the quantum numbers n = 4, $$l$$ = 3, m = 0.