Chemistry Question Bank

The energy required to break one mole of Cl–Cl bonds in Cl₂ is 242 kJ mol⁻¹. The largest wavelength of light capable of breaking a single Cl–Cl bond is

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

The number of photons emitted in 10 hours by a 60 W sodium lamp (λ = 6000 Å) is approximately

The number of photons of light with wave number ν̄ = 2.5 × 10⁶ m⁻¹ necessary to provide 1 J of energy are

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

The electrical discharge through gases could be observed only at

Positive rays (canal rays) are:

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

The e/m ratio for anode rays (positive rays) in comparison to cathode rays is:

Atoms can be further divided into sub-particles like

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

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

[NEET 2019] In hydrogen atom, the de Broglie wavelength of an electron in the second Bohr orbit is (Bohr radius a₀ = 52.9 pm)

[NEET 2019] 4d, 5p, 5f and 6p orbitals are arranged in order of decreasing energy. The correct option is