Chemistry Question Bank

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

[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

[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

[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?

[NEET 2013] What is the maximum number of electrons that can be associated with the quantum numbers n=3, l=1 and m=−1?

[CBSE AIPMT 2013] Based on equation E = −2.178 × 10⁻¹⁸ J × Z²/n², which of the following is NOT correct?

[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

[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

[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)

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

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

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

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

Suppose 10⁻¹⁷ J of light energy is needed by the interior of the human eye to see an object. The number of photons of green light (λ = 550 nm) needed to see the object are

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

[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?

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

How long would it take a radiowave of frequency 6 × 10³ s⁻¹ to travel from Mars to Earth, a distance of 8 × 10⁷ km?

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

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): Atoms are electrically neutral. Reason (R): Number of protons and electrons are different in an atom.

Assertion (A): The radius of the first orbit of hydrogen atom is 0.529 Å. Reason (R): Radius of each circular orbit rₙ = 0.529 × (n²/Z) Å, where n = 1,2,3 and Z = atomic number.

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.