Chemistry Question Bank

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

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

The number of unpaired d-electrons retained in Fe²⁺ ion (At. no. of Fe = 26) is

Assertion (A): For Balmer series of hydrogen spectrum, the value of n₁ = 2 and n₂ = 3, 4, 5 ... Reason (R): The value of n for a line in Balmer series having the highest wavelength is n₁=4 and n₂=6.

[KCET 2010] The wave number of a spectral line in the emission spectrum of hydrogen will be equal to (8/9)R_H if the electron jumps from

[AMU 2010] When the electron of a hydrogen atom jumps from n = 4 to n = 1 state, the number of spectral lines emitted is

[CBSE AIPMT 2009] Which of the following is NOT a permissible arrangement of electrons in an atom?

[Manipal 2009] The uncertainty in position of an electron (m = 9.1 × 10⁻²⁸ g) moving with velocity 3.0 × 10⁴ cm s⁻¹ accurate to 0.011% will be (h = 6.626 × 10⁻²⁷ erg·s)

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

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

[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

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

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

[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 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 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?

[NEET 2013] Planck's constant h = 6.63 × 10⁻³⁴ Js. Speed of light c = 3 × 10¹⁷ nm/s. Which value is closest to the wavelength (in nm) of a quantum of light with frequency 6 × 10¹⁵ s⁻¹?