Chemistry

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Q. What happens to the equilibrium position when a catalyst is added to a reaction at equilibrium? (2023)
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No change
  • D. Increases Kc
Q. What is the balanced equation for the redox reaction between Cr2O7^2- and Fe^2+ in acidic medium? (2020)
  • A. Cr2O7^2- + 6Fe^2+ → 2Cr^3+ + 3Fe^3+
  • B. Cr2O7^2- + 3Fe^2+ → 2Cr^3+ + 3Fe^3+
  • C. Cr2O7^2- + 4Fe^2+ → 2Cr^3+ + 4Fe^3+
  • D. Cr2O7^2- + 2Fe^2+ → 2Cr^3+ + Fe^3+
Q. What is the basic structural unit of lipids? (2020)
  • A. Amino acids
  • B. Nucleotides
  • C. Fatty acids
  • D. Monosaccharides
Q. What is the boiling point elevation for a solution with 0.5 moles of a non-volatile solute in 1 kg of water? (Kb for water = 0.512 °C kg/mol) (2022)
  • A. 0.256 °C
  • B. 0.512 °C
  • C. 1.024 °C
  • D. 0.128 °C
Q. What is the boiling point trend among amines? (2020)
  • A. Amines have lower boiling points than alkanes
  • B. Amines have higher boiling points than alcohols
  • C. Boiling points increase with molecular weight
  • D. All of the above
Q. What is the bond angle in the water molecule (H2O)? (2023)
  • A. 90 degrees
  • B. 104.5 degrees
  • C. 120 degrees
  • D. 180 degrees
Q. What is the bond angle in water (H2O) due to the presence of hydrogen? (2023)
  • A. 90 degrees
  • B. 104.5 degrees
  • C. 120 degrees
  • D. 180 degrees
Q. What is the bond angle in water (H2O) due to the presence of lone pairs on oxygen? (2019)
  • A. 104.5°
  • B. 109.5°
  • C. 120°
  • D. 90°
Q. What is the change in internal energy (ΔU) for an ideal gas during an isothermal process? (2021)
  • A. ΔU = 0
  • B. ΔU = nRT
  • C. ΔU = -nRT
  • D. ΔU = PV
Q. What is the change in internal energy (ΔU) for an ideal gas undergoing an isothermal process? (2021)
  • A. ΔU = 0
  • B. ΔU = Q
  • C. ΔU = W
  • D. ΔU = Q + W
Q. What is the change in internal energy (ΔU) for an isothermal process for an ideal gas? (2021)
  • A. ΔU = 0
  • B. ΔU = nRT
  • C. ΔU = -nRT
  • D. ΔU = PV
Q. What is the change in internal energy (ΔU) for an isothermal process of an ideal gas? (2021)
  • A. ΔU = 0
  • B. ΔU = nRT
  • C. ΔU = -nRT
  • D. ΔU = PV
Q. What is the change in oxidation state of carbon in the reaction C6H12O6 → 2C2H5OH? (2023)
  • A. +1
  • B. 0
  • C. -1
  • D. -2
Q. What is the change in oxidation state of manganese in the reaction MnO4- + 8H+ + 5e- → Mn2+ + 4H2O? (2023)
  • A. +7 to +2
  • B. +2 to +7
  • C. 0 to +2
  • D. +4 to +2
Q. What is the chemical formula for the compound formed between strontium and chlorine? (2019)
  • A. SrCl
  • B. SrCl2
  • C. Sr2Cl
  • D. Sr2Cl3
Q. What is the color of potassium permanganate (KMnO4)? (2021)
  • A. Colorless
  • B. Green
  • C. Purple
  • D. Yellow
Q. What is the color of the complex ion [Cu(NH3)4]2+? (2021)
  • A. Blue
  • B. Green
  • C. Yellow
  • D. Red
Q. What is the color of the flame produced by burning strontium salts? (2023)
  • A. Red
  • B. Green
  • C. Blue
  • D. Yellow
Q. What is the color of the flame produced by lithium salts? (2019)
  • A. Red
  • B. Green
  • C. Blue
  • D. Yellow
Q. What is the color of the solution of potassium dichromate (K2Cr2O7)? (2023)
  • A. Yellow
  • B. Green
  • C. Blue
  • D. Red
Q. What is the common oxidation state of alkaline earth metals? (2019)
  • A. +1
  • B. +2
  • C. +3
  • D. 0
Q. What is the common oxidation state of aluminum in its compounds? (2020)
  • A. +1
  • B. +2
  • C. +3
  • D. +4
Q. What is the common oxidation state of chromium in CrO3? (2023)
  • A. +2
  • B. +3
  • C. +6
  • D. +7
Q. What is the common oxidation state of iron in Fe2O3? (2019)
  • A. +1
  • B. +2
  • C. +3
  • D. +4
Q. What is the common oxidation state of iron in FeCl3? (2023)
  • A. +2
  • B. +3
  • C. +4
  • D. +6
Q. What is the common oxidation state of sulfur in sulfuric acid (H2SO4)? (2022)
  • A. +2
  • B. +4
  • C. +6
  • D. 0
Q. What is the coordination number of atoms in a face-centered cubic (FCC) lattice? (2021)
  • A. 4
  • B. 6
  • C. 8
  • D. 12
Q. What is the coordination number of atoms in a face-centered cubic (FCC) structure? (2021)
  • A. 4
  • B. 6
  • C. 8
  • D. 12
Q. What is the coordination number of the central metal ion in the complex ion [Co(NH3)6]3+? (2021)
  • A. 2
  • B. 4
  • C. 6
  • D. 8
Q. What is the effect of a catalyst on a chemical reaction? (2019)
  • A. Increases activation energy
  • B. Decreases activation energy
  • C. Changes the equilibrium constant
  • D. Has no effect on the reaction rate
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