Chemistry

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Q. What is the molecular formula of ethyne? (2022)
  • A. C2H2
  • B. C2H4
  • C. C2H6
  • D. C3H4
Q. What is the molecular formula of the simplest alkyne? (2022)
  • A. C2H2
  • B. C2H4
  • C. C3H4
  • D. C3H6
Q. What is the osmotic pressure of a 0.5 M NaCl solution at 25°C? (R = 0.0821 L·atm/(K·mol)) (2023)
  • A. 12.3 atm
  • B. 6.15 atm
  • C. 3.07 atm
  • D. 1.54 atm
Q. What is the osmotic pressure of a solution containing 0.1 moles of glucose in 1 L of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2020)
  • A. 2.03 atm
  • B. 1.96 atm
  • C. 0.82 atm
  • D. 0.25 atm
Q. What is the osmotic pressure of a solution containing 0.1 moles of glucose in 1 liter of solution at 25 °C? (R = 0.0821 L atm/K mol) (2020)
  • A. 2.06 atm
  • B. 0.82 atm
  • C. 1.01 atm
  • D. 0.25 atm
Q. What is the osmotic pressure of a solution containing 0.1 moles of solute in 1 liter of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2020)
  • A. 2.5 atm
  • B. 0.82 atm
  • C. 1.0 atm
  • D. 0.25 atm
Q. What is the osmotic pressure of a solution containing 0.5 moles of solute in 1 liter of solution at 25 °C? (2021)
  • A. 12.3 atm
  • B. 24.6 atm
  • C. 6.1 atm
  • D. 3.1 atm
Q. What is the osmotic pressure of a solution containing 0.5 moles of solute in 1 liter of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2021)
  • A. 12.3 atm
  • B. 10.2 atm
  • C. 8.2 atm
  • D. 6.1 atm
Q. What is the osmotic pressure of a solution containing 2 moles of glucose in 1 liter of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2020)
  • A. 0.82 atm
  • B. 1.64 atm
  • C. 2.46 atm
  • D. 4.92 atm
Q. What is the osmotic pressure of a solution containing 2 moles of glucose in 1 liter of solution at 25 °C? (2021)
  • A. 0.0821 atm
  • B. 1.0 atm
  • C. 2.0 atm
  • D. 4.0 atm
Q. What is the oxidation state of nitrogen in NH4Cl? (2023)
  • A. -3
  • B. +3
  • C. +1
  • D. 0
Q. What is the packing efficiency of a body-centered cubic (BCC) structure? (2020)
  • A. 52%
  • B. 68%
  • C. 74%
  • D. 100%
Q. What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-3 M? (2019)
  • A. 1
  • B. 3
  • C. 7
  • D. 10
Q. What is the primary active ingredient in aspirin? (2019)
  • A. Acetylsalicylic acid
  • B. Salicylic acid
  • C. Acetic acid
  • D. Benzoic acid
Q. What is the primary benefit of probiotics? (2023)
  • A. Increase weight
  • B. Improve gut health
  • C. Enhance vision
  • D. Boost hair growth
Q. What is the primary characteristic of a redox reaction? (2023)
  • A. Transfer of protons
  • B. Transfer of electrons
  • C. Change in temperature
  • D. Change in pressure
Q. What is the primary characteristic of alkaline earth metals? (2020)
  • A. They are highly reactive
  • B. They have a +2 oxidation state
  • C. They are gases at room temperature
  • D. They form covalent bonds
Q. What is the primary characteristic of amorphous solids? (2023)
  • A. Long-range order
  • B. Short-range order
  • C. Definite melting point
  • D. High thermal conductivity
Q. What is the primary difference between physisorption and chemisorption? (2023)
  • A. Physisorption is stronger than chemisorption
  • B. Chemisorption involves chemical bonds, while physisorption involves van der Waals forces
  • C. Physisorption is irreversible, while chemisorption is reversible
  • D. Chemisorption occurs at lower temperatures than physisorption
Q. What is the primary factor affecting the rate of a chemical reaction? (2022)
  • A. Concentration
  • B. Temperature
  • C. Catalyst
  • D. All of the above
Q. What is the primary force holding the atoms together in covalent network solids? (2022)
  • A. Ionic bonds
  • B. Covalent bonds
  • C. Metallic bonds
  • D. Van der Waals forces
Q. What is the primary force holding together the atoms in a metallic solid? (2020)
  • A. Ionic bonds
  • B. Covalent bonds
  • C. Metallic bonds
  • D. Van der Waals forces
Q. What is the primary force holding together the atoms in metallic solids? (2020)
  • A. Ionic bonds
  • B. Covalent bonds
  • C. Metallic bonds
  • D. Van der Waals forces
Q. What is the primary function of antibiotics? (2020)
  • A. Pain relief
  • B. Bacterial infection treatment
  • C. Viral infection treatment
  • D. Fungal infection treatment
Q. What is the primary function of antioxidants in food? (2022)
  • A. Enhance flavor
  • B. Preserve color
  • C. Prevent oxidation
  • D. Increase sweetness
Q. What is the primary function of antioxidants in the body? (2020)
  • A. Increase energy
  • B. Prevent oxidation
  • C. Enhance digestion
  • D. Boost immunity
Q. What is the primary function of antioxidants in the human body? (2020)
  • A. Increase energy
  • B. Prevent oxidation
  • C. Enhance digestion
  • D. Boost immunity
Q. What is the primary function of cholesterol in the body? (2023)
  • A. Energy storage
  • B. Hormone production
  • C. Protein synthesis
  • D. Carbohydrate metabolism
Q. What is the primary oxidation state of carbon in carbon dioxide (CO2)? (2020)
  • A. +2
  • B. +4
  • C. 0
  • D. -4
Q. What is the primary oxidation state of iron in FeCl3? (2023)
  • A. +2
  • B. +3
  • C. +4
  • D. +6
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