Chemistry Question Bank

Calculate the frequency of yellow radiation having wavelength 5800 Å.

Which is NOT a characteristic of Planck's quantum theory of radiation?

The number of photons of light with wave number ν̄ = 2.5 × 10⁶ m⁻¹ necessary to provide 1 J of energy are

The correct order of increasing energy of orbitals in hydrogen atom is

Aufbau principle does NOT give the correct arrangement of filling of atomic orbitals in

The number of photons emitted in 10 hours by a 60 W sodium lamp (λ = 6000 Å) is approximately

The correct ground state electronic configuration of chromium atom (Z = 24) is

As an electron moves away from the nucleus, its potential energy

[NEET 2022] If the radius of the second Bohr orbit of He⁺ ion is 105.8 pm, what is the radius of the third Bohr orbit of Li²⁺ ion?

[NEET 2014] Calculate the energy in joule corresponding to light of wavelength 45 nm. (h = 6.63 × 10⁻³⁴ Js, c = 3 × 10⁸ ms⁻¹)

[Kerala CEE 2014] The maximum number of electrons that can be held by a subshell with azimuthal quantum number 'l' in an atom is given by

[CBSE AIPMT 2013] Based on equation E = −2.178 × 10⁻¹⁸ J × Z²/n², which of the following is NOT correct?

[NEET 2013] Planck's constant h = 6.63 × 10⁻³⁴ Js. Speed of light c = 3 × 10¹⁷ nm/s. Which value is closest to the wavelength (in nm) of a quantum of light with frequency 6 × 10¹⁵ s⁻¹?

The e/m ratio for anode rays (positive rays) in comparison to cathode rays is:

The electrical discharge through gases could be observed only at

In the Rutherford scattering experiment, most α-particles passed straight through the gold foil because

[NEET 2019] 4d, 5p, 5f and 6p orbitals are arranged in order of decreasing energy. The correct option is

Rutherford's nuclear model of the atom failed to explain

The energy required to break one mole of Cl–Cl bonds in Cl₂ is 242 kJ mol⁻¹. The largest wavelength of light capable of breaking a single Cl–Cl bond is

Ultraviolet light of 6.2 eV falls on an aluminium surface (work function = 4.2 eV). The kinetic energy (in joule) of the fastest electron emitted is approximately:

The threshold wavelength for the photoelectric effect on sodium is 5000 Å. Its work function is:

If the threshold frequency of a metal for the photoelectric effect is ν₀, which of the following will NOT happen?

The ionization energy of H atom is 13.6 eV. The ionization energy of Li²⁺ ion will be

Energy of electron of hydrogen atom in the second Bohr orbit is

For a Bohr atom, angular momentum of the electron is (n = 1, 2, 3 …)