Chemistry Question Bank

Electronic energy is negative because

The Bohr orbit radius for hydrogen atom (n = 1) is 0.529 Å. The radius for the first excited state (n = 2) orbit is

Which series in the hydrogen spectrum lies in the ultraviolet region?

Increasing the frequency of incident radiation in the photoelectric effect increases the:

The photoelectric effect shows:

In the photoelectric effect, the number of photoelectrons emitted is proportional to:

The energy ratio of photons of wavelength 3000 Å and 6000 Å is

The kinetic energy of photoelectrons does NOT depend upon

Einstein's theory of photoelectric effect is based on:

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

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

The number of wavelengths per unit length is called

The correct order of increasing wavelength of electromagnetic radiations is

Atoms can be further divided into sub-particles like

The minimum frequency ν₀, below which the photoelectric effect is not observed, is called

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

The smallest and lightest positive ion obtained from hydrogen is called

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

Mass of neutron is about ________ times the mass of the electron.

Early Indian and Greek philosophers were of the view that 'A' are the fundamental building blocks of matter. Here, 'A' refers to

Positive rays (canal rays) are:

Pauli's exclusion principle states that

[Manipal 2008] Deflection of a few α-particles back on hitting a thin gold foil shows that

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

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