Chemistry Question Bank

Mass of neutron is about ________ times the mass of the electron.

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

Atoms can be further divided into sub-particles like

Early Indian and Greek philosophers were of the view that 'A' are the fundamental building blocks of matter. Here, 'A' refers to

[Kerala CEE 2014] The ratio of de Broglie wavelengths of a deuterium atom to that of an α-particle, when the velocity of deuterium is five times that of the α-particle, is

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

When sodium compounds are heated in a Bunsen burner flame, they emit light at 5890 Å. If 1.0 × 10⁻⁴ moles of sodium atoms each emit one photon of this wavelength, how much energy (in kJ) is emitted?

Find the frequency of light that corresponds to photons of energy 5.0 × 10⁻⁵ erg

The emission spectra of He⁺ ions show 6 different photons (from transitions to ground state). The quantum number n of the state finally populated in He⁺ ions from the H–He⁺ mixture experiment (after H transfers excita…

In the H–He⁺ mixture experiment, the wavelength of light emitted in the visible region by He⁺ ions after collisions with H atoms is

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?

[CBSE AIPMT 2011] The energies E₁ and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths λ₁ and λ₂ will be

[Manipal 2010] Which one of the following statements in relation to the hydrogen atom is correct?

[KCET 2012] The nitride ion in lithium nitride (Li₃N) is composed of

[AIPMT 2012] Maximum number of electrons in a subshell with l = 3 and n = 4 is