Chemistry Question Bank

[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 2021] A radio station broadcasts at frequency 1368 kHz. The wavelength of electromagnetic radiation emitted is (c = 3 × 10⁸ m/s)

[NEET 2020] In ¹⁷⁵₇₁Lu, the number of protons, neutrons and electrons respectively are

The minimum frequency ν₀, below which the photoelectric effect is not observed, is called

The kinetic energy of photoelectrons does NOT depend upon

[NEET 2016] Two electrons occupying the same orbital are distinguished by

[NEET 2016] How many electrons can fit in the orbital for which n = 3 and l = 1?

[CBSE AIPMT 2015] The orbital angular momentum of an electron in a d orbital is equal to

[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)

The photoelectric effect shows:

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

[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

[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?

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

[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

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

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

The electrical discharge through gases could be observed only at

Positive rays (canal rays) are:

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

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

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

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

Atoms can be further divided into sub-particles like