Chemistry Question Bank

When electrons of a hydrogen atom return to the L shell (n=2) from higher energy shells, the series of lines formed is called

According to Bohr's theory, the angular momentum of an electron in 5th orbit is

Bohr's theory is NOT applicable to:

The velocity of an electron in the second shell of hydrogen atom is

The most probable radius (in pm) for finding the electron in He⁺ is

Which of the following electronic transitions in a hydrogen atom will require the largest amount of energy?

If the total energy of an electron in the 1st shell of H atom = 0.0 eV (reference shifted), then its potential energy in the 1st excited state would be

The ionization enthalpy of hydrogen atom is 1.312 × 10⁶ J mol⁻¹. The energy required to excite the electron from n = 1 to n = 2 is

The emission spectra of He⁺ ions show 6 different photons. What will be the minimum wavelength during the transition? (R_H = Rydberg constant)

The frequency of light emitted for the transition n = 4 to n = 2 of He⁺ is equal to the transition in H atom corresponding to which of the following?

[Manipal 2008] Deflection of a few α-particles back on hitting a thin gold foil shows that

[CBSE AIPMT 2008] If uncertainty in position and momentum are equal, then uncertainty in velocity is

[AMU 2009] Probability of finding an electron at the nodal surface is

[Haryana PMT 2009] The number of radial nodes of 3s and 2p-orbitals are respectively

[Haryana PMT 2009] The number of nodal planes in the pₓ orbital is

[AMU 2009] The radius of the Bohr orbit of the H-atom is r. Then the radius of the first orbit of Li²⁺ will be

[Manipal 2009] For f-orbital, the values of magnetic quantum number m are

[Manipal 2009] The uncertainty in position of an electron (m = 9.1 × 10⁻²⁸ g) moving with velocity 3.0 × 10⁴ cm s⁻¹ accurate to 0.011% will be (h = 6.626 × 10⁻²⁷ erg·s)

[CBSE AIPMT 2009] Which of the following is NOT a permissible arrangement of electrons in an atom?

[Haryana PMT 2010] The electronic configuration 1s², 2s², 2p¹ₓ 2p¹ᵧ 2p¹_z for nitrogen (not 1s², 2s², 2p²ₓ 2p¹ᵧ 2p⁰_z) is determined by

[RPMT 2010] Principal, azimuthal and magnetic quantum numbers are respectively related to

[AMU 2010] When the electron of a hydrogen atom jumps from n = 4 to n = 1 state, the number of spectral lines emitted is

[MP PMT 2010] The relation between wave nature of light (photons) and stream of particles is given by de Broglie's equation:

[KCET 2010] The wave number of a spectral line in the emission spectrum of hydrogen will be equal to (8/9)R_H if the electron jumps from

[VMMC 2010] Which of the following pairs is isoelectronic?