20) Which of the statements given is not true about electromagnetic radiation? a frequency is directly proportional to wavelength b frequency is directly proportional to energy c frequency is inversely proportional to wavelength dwavelength is inversely proportional to energy Energy is directly proportional to frequency and wavelength 21) Which of the types of electromagnetic radiation shown has the highest energy? a. LV b. X-ray CIR d microwave e visible 22) Which of the given vibrations are observed in IR spectroscopy? a stretching b. rotational cbending d. A and B A and C e

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Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.