Chemistry (School & UG)

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Q. In IR spectroscopy, what does a peak at around 1700 cm-1 typically indicate?
  • A. Presence of alcohols
  • B. Presence of carbonyl groups
  • C. Presence of amines
  • D. Presence of alkenes
Q. In IR spectroscopy, what does a peak in the spectrum represent?
  • A. Absence of molecular vibrations
  • B. Presence of a specific bond or functional group
  • C. Temperature of the sample
  • D. Concentration of the sample
Q. In IR spectroscopy, what type of molecular vibrations are primarily detected?
  • A. Rotational
  • B. Translational
  • C. Stretching and bending
  • D. Electron transitions
Q. In IR spectroscopy, what type of molecular vibrations are typically observed?
  • A. Translational vibrations
  • B. Rotational vibrations
  • C. Stretching and bending vibrations
  • D. Electronic transitions
Q. In IR spectroscopy, which bond typically shows a strong absorption around 3300 cm-1?
  • A. C-H bond
  • B. N-H bond
  • C. O-H bond
  • D. C=O bond
Q. In IR spectroscopy, which functional group is characterized by a strong absorption around 1700 cm-1?
  • A. Alcohols
  • B. Aldehydes
  • C. Carboxylic acids
  • D. Ketones
Q. In IR spectroscopy, which functional group is indicated by a strong peak around 1700 cm-1?
  • A. Alcohol
  • B. Aldehyde
  • C. Carboxylic Acid
  • D. Carbonyl
Q. In IR spectroscopy, which functional group is typically identified by a strong absorption around 1700 cm-1?
  • A. Alcohols
  • B. Aldehydes
  • C. Carboxylic acids
  • D. Ketones
Q. In IR spectroscopy, which functional group typically shows a strong absorption around 1700 cm-1?
  • A. Alcohols
  • B. Aldehydes
  • C. Carboxylic acids
  • D. Ketones
Q. In IR spectroscopy, which region is typically used to identify functional groups?
  • A. Near-infrared region
  • B. Mid-infrared region
  • C. Far-infrared region
  • D. Ultraviolet region
Q. In IR spectroscopy, which type of molecular vibration is primarily detected?
  • A. Rotational transitions
  • B. Translational movements
  • C. Vibrational modes
  • D. Electronic transitions
Q. In mass spectrometry, what does the term 'fragmentation' refer to?
  • A. The separation of ions based on mass
  • B. The breaking of molecular bonds to form smaller ions
  • C. The ionization of molecules
  • D. The detection of ions
Q. In mass spectrometry, what does the term 'm/z' represent?
  • A. Mass to charge ratio
  • B. Molecular weight
  • C. Ionization energy
  • D. Retention time
Q. In metallurgy, what is the significance of the term 'gangue'?
  • A. The desired metal
  • B. The waste material
  • C. The reducing agent
  • D. The flux used
Q. In qualitative analysis, what does a positive result in a precipitation test indicate?
  • A. The absence of ions
  • B. The presence of specific ions
  • C. The need for further testing
  • D. The presence of impurities
Q. In qualitative analysis, what does a positive test for the presence of ammonium ions typically involve?
  • A. Formation of a blue complex
  • B. Evolution of ammonia gas
  • C. Color change with phenolphthalein
  • D. Precipitation with barium sulfate
Q. In qualitative analysis, what does a positive test for the presence of sulfate ions typically involve?
  • A. Formation of a white precipitate
  • B. Formation of a colored solution
  • C. Gas evolution
  • D. No visible change
Q. In qualitative analysis, what does the presence of a white precipitate indicate when testing for chloride ions?
  • A. Presence of sulfate ions
  • B. Presence of phosphate ions
  • C. Presence of chloride ions
  • D. Presence of nitrate ions
Q. In qualitative analysis, what does the term 'chromatographic retention time' refer to?
  • A. The time taken for a sample to reach the detector
  • B. The time taken for a solvent to evaporate
  • C. The time taken for a compound to elute from the column
  • D. The time taken for a reaction to complete
Q. In qualitative analysis, what does the term 'colorimetric analysis' refer to?
  • A. Measuring the mass of a sample
  • B. Determining the concentration of a colored solution
  • C. Identifying ions based on their color change
  • D. Separating ions by size
Q. In qualitative analysis, what does the term 'precipitation reaction' refer to?
  • A. The formation of a gas
  • B. The formation of a solid from a solution
  • C. The change of color in a solution
  • D. The separation of ions by size
Q. In qualitative analysis, which reagent is commonly used to test for the presence of sulfate ions?
  • A. Barium chloride
  • B. Silver nitrate
  • C. Hydrochloric acid
  • D. Sodium hydroxide
Q. In qualitative ion analysis, what does the term 'selectivity' refer to?
  • A. The ability to detect multiple ions
  • B. The ability to distinguish between different ions
  • C. The speed of analysis
  • D. The cost of the analysis
Q. In quantum chemistry, what does the wave function describe?
  • A. The position of a particle.
  • B. The energy of a system.
  • C. The probability distribution of a particle.
  • D. The momentum of a particle.
Q. In redox reactions, what happens to the oxidation state of a transition metal when it acts as a reducing agent?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. In redox reactions, what happens to the oxidation state of a transition metal when it acts as an oxidizing agent?
  • A. It decreases
  • B. It increases
  • C. It remains the same
  • D. It becomes zero
Q. In redox reactions, what happens to the oxidation state of the reducing agent?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In redox reactions, which of the following statements is true?
  • A. Oxidation is the gain of electrons.
  • B. Reduction is the loss of electrons.
  • C. Oxidizing agents are reduced.
  • D. Reducing agents are oxidized.
Q. In redox reactions, which species is reduced?
  • A. Oxidizing agent
  • B. Reducing agent
  • C. Product
  • D. Reactant
Q. In surface chemistry, what is adsorption?
  • A. The process of a substance being absorbed into another
  • B. The accumulation of molecules on a surface
  • C. The release of gas from a liquid
  • D. The mixing of two gases
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