Chemistry Question Bank

Rank the following radiations from highest energy to lowest: X-ray, ultraviolet, visible, infrared, microwave

Calculate the frequency of yellow radiation having wavelength 5800 Å.

The number of wavelengths per unit length is called

The relationship between frequency (ν), wavelength (λ) and velocity of light (c) is

The correct order of increasing wavelength of electromagnetic radiations is

Rutherford's nuclear model of the atom failed to explain

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

The ratio of the energy difference between the 1st and 2nd Bohr orbits to that between the 2nd and 3rd Bohr orbits is

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

[NEET 2021] From the following pairs, which one is NOT an isoelectronic pair?

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

[NEET 2019] In hydrogen atom, the de Broglie wavelength of an electron in the second Bohr orbit is (Bohr radius a₀ = 52.9 pm)

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

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?

A stream of electrons is passed between two charged plates at potential difference V (esu). If e and m are charge and mass of electron, the value of h/λ (λ = de Broglie wavelength) is

In any subshell, the maximum number of electrons having the same value of spin quantum number is

[NEET 2019] Orbital having 3 angular nodes and 3 total nodes is

[CBSE AIPMT 2015] The number of d-electrons in Fe²⁺ (Z = 26) is NOT equal to the number of electrons in which one of the following?

The correct set of four quantum numbers for the valence electron of rubidium (Z = 37) is