Chemistry Question Bank

Atoms can be further divided into sub-particles like

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

Positive rays (canal rays) are:

The oil drop experiment was developed by

The smallest and lightest positive ion obtained from hydrogen is called

The correct order of increasing wavelength of electromagnetic radiations is

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

The number of wavelengths per unit length is called

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:

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

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

Einstein's theory of photoelectric effect is based on:

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

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

The photoelectric effect shows:

The kinetic energy of photoelectrons does NOT depend upon

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

The energy of an electron in the 3rd orbit of hydrogen atom is

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

According to Bohr model, angular momentum of an electron in the 3rd orbit is

Electronic energy is negative because

The value of a₀ (Bohr radius) in the expression for the radius of nth orbit of hydrogen atom (rₙ = n²a₀) is

Which of the following statements does NOT form a part of Bohr's model of hydrogen atom?

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