Chemistry Question Bank

In the H–He⁺ mixture experiment, the ratio of potential energy of the n=2 electron for the H atom to that of He⁺ ion is

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

Pauli's exclusion principle states that

Pairing of electrons in orbitals belonging to the same subshell does not take place until each orbital is singly occupied. This is called

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

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

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

[NEET 2019] 4d, 5p, 5f and 6p orbitals are arranged in order of decreasing energy. The correct option 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 2021] From the following pairs, which one is NOT an isoelectronic pair?

The number of wavelengths per unit length is called

Calculate the frequency of yellow radiation having wavelength 5800 Å.

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

The relation between energy of radiation and its frequency was given by:

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

According to Planck, the smallest quantity of energy that can be emitted or absorbed in the form of electromagnetic radiation is called

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

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

The energy ratio of photons of wavelength 3000 Å and 6000 Å is

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

Einstein's theory of photoelectric effect is based on:

In the photoelectric effect, the number of photoelectrons emitted is proportional to:

Increasing the frequency of incident radiation in the photoelectric effect increases the:

The photoelectric effect shows: