Chemistry Question Bank

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

[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

[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 order of increasing energy of orbitals in hydrogen atom is

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

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

Pauli's exclusion principle states that

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

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

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…

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

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

Let mₚ be the mass of a proton, mₙ that of a neutron, M₁ that of a ²⁰₁₀Ne nucleus and M₂ that of a ⁴⁰₂₀Ca nucleus. Then

[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

[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)

[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?