Chemical Science MCQs: Previously asked problems in CSIR NET Chemical Science

Chemical Science MCQs previously asked problems in CSIR NET CHEMICAL SCIENCE Which of the following is not a correct statement about molecular mechanics method?




Answer: It is a quantum mechanics method that solves the Schrödinger equation for the molecule to obtain its energy levels.

Which of the following is not a correct statement about the Born-Haber cycle?




Answer: It is a quantum mechanical method that calculates the electron density of an ionic solid.

Which of the following is not a correct statement about the Marcus theory of electron transfer?




Answer: It is a classical mechanics method that solves the equations of motion for the electrons and nuclei in the system.

Which of the following is not a correct statement about NMR spectroscopy?




Answer: It can only be used for molecules that contain paramagnetic atoms, such as iron or copper.

Which of the following is not a correct statement about the Woodward-Hoffmann rules?




Answer: They are only applicable to reactions that involve molecules with conjugated double bonds.

Which of the following is not a correct statement about the Boltzmann distribution?




Answer: It predicts that the most probable energy state of a particle is the one with the highest energy.

Which of the following is not a correct statement about the Born-Haber cycle?




Answer: It does not involve the calculation of the activation energy of the reaction.

Which of the following is not a correct statement about electrochemistry?




Answer: It does not have any practical applications in industry or technology.

Which of the following is not a correct statement about NMR spectroscopy?




Answer: It is a technique that can only be used for the analysis of small organic molecules.

Which of the following is not a correct statement about mass spectrometry?




Answer: It can only be used to analyze compounds that are volatile and thermally stable.

Which of the following statements about NMR spectroscopy is correct?




Answer: All of the above.

Which of the following reagents is commonly used for the reduction of aldehydes and ketones to alcohols?




Answer: Lithium aluminum hydride (LiAlH4).

Which of the following statements about a reaction's rate constant is true?




Answer: All of the above.

Which of the following statements about electrochemistry is correct?




Answer: The standard electrode potential is the measure of the tendency of an electrode to lose or gain electrons.

Which of the following statements about carboxylic acids is true?




Answer: They are typically weak acids, with pKa values in the range of 4-5.

Which of the following is a correct statement about the Hückel rule?




Answer: It can be used to predict the aromaticity or antiaromaticity of a compound based on its structure and electron count.

Which of the following is a correct statement about nucleophilic substitution reactions?




Answer: Steric hindrance around the substrate can slow down or prevent nucleophilic substitution reactions from occurring.

Which of the following is a correct statement about transition metal complexes?




Answer: A chelating ligand can bind to a metal ion through multiple donor atoms to form a more stable complex.

Which of the following is a correct statement about enzyme kinetics?




Answer: The Michaelis-Menten equation describes the relationship between the substrate concentration and the rate of an enzyme-catalyzed reaction.

Which of the following is a correct statement about mass spectrometry?




Answer: Electrospray ionization is a soft ionization technique that is commonly used to analyze large biomolecules such as proteins and peptides.





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