Chemistry Question Bank

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

Assertion (A): It is impossible to determine the exact position and exact momentum of an electron simultaneously. Reason (R): The path of an electron in an atom is clearly defined.

Bohr's theory is NOT applicable to:

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

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

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:

Einstein's theory of photoelectric effect is based on:

The kinetic energy of photoelectrons does NOT depend upon

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

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

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

The correct order of increasing wavelength of electromagnetic radiations is

The smallest and lightest positive ion obtained from hydrogen is called

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

Positive rays (canal rays) are:

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

The oil drop experiment was developed by

The number of wavelengths per unit length is called

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

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

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

[NEET 2021] From the following pairs, which one is NOT an isoelectronic pair?

Pauli's exclusion principle states that