Chemistry Question Bank

According to Planck, the smallest quantity of energy that can be emitted or absorbed in the form of electromagnetic radiation is called

Which is NOT a characteristic of Planck's quantum theory of radiation?

The relation between energy of radiation and its frequency was given by:

Rank the following radiations from highest energy to lowest: X-ray, ultraviolet, visible, infrared, microwave

Calculate the frequency of yellow radiation having wavelength 5800 Å.

The number of wavelengths per unit length is called

The relationship between frequency (ν), wavelength (λ) and velocity of light (c) is

The correct order of increasing wavelength of electromagnetic radiations is

Rutherford's nuclear model of the atom failed to explain

In the Rutherford scattering experiment, most α-particles passed straight through the gold foil because

The smallest and lightest positive ion obtained from hydrogen is called

The oil drop experiment was developed by

A photon of 300 nm is absorbed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496 nm. The wavelength of the second re-emitted photon is

A 4000 Å photon is used to break the I₂ molecule. The bond dissociation energy of I₂ is 246.5 kJ/mol. The % of photon energy converted to kinetic energy of iodine atoms is

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

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?

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

Electronic energy is negative because

[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)