Chemistry (School & UG)

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Q. In the reaction PCl5(g) ⇌ PCl3(g) + Cl2(g), what will happen if Cl2 is removed from the system?
  • A. Shift to the left
  • B. Shift to the right
  • C. No change
  • D. Increase the rate of reaction
Q. In the van der Waals equation, what do the 'a' and 'b' constants represent?
  • A. Attraction and volume correction
  • B. Pressure and temperature
  • C. Density and molar mass
  • D. Entropy and enthalpy
Q. In titration, what is the purpose of the indicator?
  • A. To increase the reaction rate
  • B. To provide a visual signal of endpoint
  • C. To stabilize the pH
  • D. To dilute the solution
Q. In UV-Vis spectroscopy, what does a higher absorbance indicate about the concentration of a solution?
  • A. Lower concentration
  • B. Higher concentration
  • C. No correlation
  • D. Increased temperature
Q. In UV-Vis spectroscopy, what does a higher absorbance indicate about the concentration of a sample?
  • A. Lower concentration
  • B. Higher concentration
  • C. No correlation
  • D. Increased path length
Q. In UV-Vis spectroscopy, what does a higher absorbance indicate?
  • A. Lower concentration of the analyte
  • B. Higher concentration of the analyte
  • C. Higher wavelength of light
  • D. Lower energy of light
Q. In UV-Vis spectroscopy, what does a higher absorbance value indicate?
  • A. Lower concentration of the analyte
  • B. Higher concentration of the analyte
  • C. Higher wavelength of light
  • D. Lower path length of the sample
Q. In UV-Vis spectroscopy, what does a higher molar absorptivity indicate?
  • A. Lower concentration
  • B. Higher concentration
  • C. More efficient light absorption
  • D. Less efficient light absorption
Q. In UV-Vis spectroscopy, what does a peak at 260 nm typically indicate?
  • A. Presence of proteins
  • B. Presence of nucleic acids
  • C. Presence of carbohydrates
  • D. Presence of lipids
Q. In UV-Vis spectroscopy, what does a peak at 280 nm typically indicate?
  • A. Presence of nucleic acids
  • B. Presence of proteins
  • C. Presence of carbohydrates
  • D. Presence of lipids
Q. In UV-Vis spectroscopy, what does a peak in the absorbance spectrum indicate?
  • A. The presence of a specific ion
  • B. The concentration of a gas
  • C. The molecular weight of a compound
  • D. The boiling point of a solution
Q. In UV-Vis spectroscopy, what does a peak in the absorption spectrum indicate?
  • A. The presence of impurities
  • B. The concentration of the sample
  • C. A specific electronic transition
  • D. The temperature of the sample
Q. In UV-Vis spectroscopy, what does a shift in the absorption peak indicate?
  • A. Change in concentration
  • B. Change in pH
  • C. Change in molecular structure
  • D. Change in temperature
Q. In UV-Vis spectroscopy, what does the Beer-Lambert law relate?
  • A. Wavelength and energy
  • B. Absorbance and concentration
  • C. Frequency and intensity
  • D. Temperature and pressure
Q. In UV-Vis spectroscopy, what is the effect of increasing the path length of the sample cell?
  • A. Decreases absorbance
  • B. Increases absorbance
  • C. No effect on absorbance
  • D. Increases transmittance
Q. In Werner's theory, what does the term 'primary valence' refer to?
  • A. The oxidation state of the metal
  • B. The number of ligands
  • C. The type of ligands
  • D. The geometry of the complex
Q. In Werner's theory, what is the role of ligands in coordination compounds?
  • A. To provide electrons to the metal ion
  • B. To stabilize the oxidation state of the metal
  • C. To determine the color of the complex
  • D. To increase the coordination number
Q. In which application is hydrogen used as a reducing agent?
  • A. Electrolysis
  • B. Metal extraction
  • C. Acid-base neutralization
  • D. Combustion
Q. In which molecule is the bond angle closest to 120°?
  • A. H2O
  • B. CO2
  • C. BF3
  • D. NH3
Q. In which of the following compounds does hydrogen act as a Lewis acid?
  • A. H2O
  • B. HCl
  • C. BF3
  • D. H2
Q. In which of the following compounds does hydrogen exhibit an oxidation state of -1?
  • A. H2O
  • B. HCl
  • C. NaH
  • D. H2O2
Q. In which of the following compounds does the central atom exhibit sp3d2 hybridization?
  • A. SF6
  • B. XeF4
  • C. NH3
  • D. CCl4
Q. In which of the following compounds is the bond angle approximately 109.5 degrees?
  • A. H2O
  • B. NH3
  • C. CH4
  • D. BF3
Q. In which of the following compounds is the central atom sp3 hybridized?
  • A. BeCl2
  • B. CH4
  • C. CO2
  • D. NH3
Q. In which of the following coordination compounds does hydrogen act as a ligand?
  • A. [Fe(H2O)6]2+
  • B. [Cu(NH3)4]2+
  • C. [CoCl4]2-
  • D. [Ag(CN)2]-
Q. In which of the following molecules does hydrogen bonding occur?
  • A. CH4
  • B. H2O
  • C. CO2
  • D. N2
Q. In which of the following molecules is the bond length the shortest?
  • A. C2H2
  • B. C2H4
  • C. C2H6
  • D. C2
Q. In which of the following molecules is the central atom sp2 hybridized?
  • A. C2H4
  • B. C2H2
  • C. CH4
  • D. C3H6
Q. In which of the following molecules is the central atom sp3 hybridized?
  • A. BeCl2
  • B. SiCl4
  • C. PCl5
  • D. SF6
Q. In which of the following processes is hydrogen used to reduce metal ores?
  • A. Electrolysis
  • B. Hydrometallurgy
  • C. Pyrometallurgy
  • D. Hydrogen reduction
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