Chemistry Question Bank

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?

[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

[CBSE AIPMT 2011] If n = 6, the correct sequence of filling of electrons will be

[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)

[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 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

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.

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

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

Which of the following electronic transitions in a hydrogen atom will require the largest amount of energy?

The most probable radius (in pm) for finding the electron in He⁺ is

The velocity of an electron in the second shell of hydrogen atom is

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

The ratio of the energy difference between the 1st and 2nd Bohr orbits to that between the 2nd and 3rd Bohr orbits is

For a Bohr atom, angular momentum of the electron is (n = 1, 2, 3 …)

Energy of electron of hydrogen atom in the second Bohr orbit is