Chemistry

Q. The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the formula for the half-life (t1/2) of a first-order reaction? (2020)
  • A. t1/2 = 0.693/k
  • B. t1/2 = k/0.693
  • C. t1/2 = 1/k
  • D. t1/2 = k/1
Q. The Langmuir isotherm assumes that adsorption occurs at specific sites on the surface. What is the maximum coverage called? (2021)
  • A. Saturation
  • B. Monolayer
  • C. Multilayer
  • D. Equilibrium
Q. The Langmuir isotherm assumes that adsorption occurs at specific sites on the surface. What does this imply? (2020)
  • A. Adsorption is uniform.
  • B. Adsorption is multilayered.
  • C. Adsorption is monolayered.
  • D. Adsorption is temperature dependent.
Q. The rate constant of a reaction is affected by which of the following? (2023)
  • A. Nature of the reactants
  • B. Temperature
  • C. Catalysts
  • D. All of the above
Q. What does the term 'enthalpy' refer to? (2020)
  • A. Internal energy plus pressure times volume
  • B. Heat content of a system at constant pressure
  • C. Total energy of a system
  • D. Work done by the system
Q. What happens to the entropy of an isolated system? (2020) 2020
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It can either increase or decrease
Q. What happens to the particles in a gas when the temperature increases? (2023)
  • A. They move slower
  • B. They move faster
  • C. They stay the same
  • D. They condense
Q. What happens to the particles in a solid when it is heated? (2023)
  • A. They move closer together.
  • B. They vibrate more vigorously.
  • C. They become gas.
  • D. They stop moving.
Q. What happens to the particles of a solid when it is heated? (2023)
  • A. They move closer together
  • B. They vibrate faster
  • C. They become a gas
  • D. They lose mass
Q. What happens to the pressure of a gas if the volume is decreased while the temperature remains constant?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Doubles
Q. What happens to the temperature of a gas during an isothermal expansion? (2021)
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Varies with pressure
Q. What happens to the volume of a gas when its temperature increases at constant pressure? (2020)
  • A. Volume decreases
  • B. Volume remains constant
  • C. Volume increases
  • D. Volume fluctuates
Q. What is the atomic mass of Oxygen approximately? (2019)
  • A. 16 u
  • B. 18 u
  • C. 14 u
  • D. 12 u
Q. What is the atomic mass of Sodium (Na)? (2021)
  • A. 22.99
  • B. 23.00
  • C. 24.00
  • D. 25.00
Q. What is the atomic number of Carbon? (2021)
  • A. 6
  • B. 12
  • C. 14
  • D. 8
Q. What is the atomic number of Oxygen?
  • A. 6
  • B. 8
  • C. 16
  • D. 12
Q. What is the basic unit of proteins? (2023) 2023
  • A. Monosaccharide
  • B. Amino acid
  • C. Nucleotide
  • D. Fatty acid
Q. What is the boiling point of water at standard atmospheric pressure?
  • A. 100°C
  • B. 0°C
  • C. 50°C
  • D. 150°C
Q. What is the boiling point trend among alcohols? (2020) 2020
  • A. Decreases with molecular weight
  • B. Increases with molecular weight
  • C. Remains constant
  • D. Increases with branching
Q. What is the boiling point trend among primary, secondary, and tertiary amines?
  • A. Primary > Secondary > Tertiary
  • B. Tertiary > Secondary > Primary
  • C. Secondary > Primary > Tertiary
  • D. All have the same boiling point
Q. What is the boiling point trend of alcohols compared to alkanes?
  • A. Higher
  • B. Lower
  • C. Same
  • D. Varies
Q. What is the boiling point trend of amines compared to alkanes?
  • A. Higher
  • B. Lower
  • C. Same
  • D. Varies
Q. What is the boiling point trend of carboxylic acids compared to alcohols?
  • A. Higher
  • B. Lower
  • C. Same
  • D. Depends on molecular weight
Q. What is the boiling point trend of primary, secondary, and tertiary amines?
  • A. Primary > Secondary > Tertiary
  • B. Tertiary > Secondary > Primary
  • C. Secondary > Primary > Tertiary
  • D. All have the same boiling point
Q. What is the bond angle in a methane (CH4) molecule? (2023) 2023
  • A. 90 degrees
  • B. 109.5 degrees
  • C. 120 degrees
  • D. 180 degrees
Q. What is the cell potential of a Daniell cell at standard conditions?
  • A. 1.10 V
  • B. 1.96 V
  • C. 0.76 V
  • D. 0.34 V
Q. What is the cell potential of a galvanic cell with E° = 1.5 V and Q = 10?
  • A. 1.2 V
  • B. 1.0 V
  • C. 1.3 V
  • D. 1.4 V
Q. What is the change in internal energy (ΔU) for an ideal gas that expands isothermally? (2022)
  • A. 0
  • B. nRT
  • C. nRΔT
  • D. PV
Q. What is the change in internal energy for an ideal gas that expands isothermally? (2019)
  • A. nRT
  • B. 0
  • C. -nRT
  • D. nR(Tf - Ti)
Q. What is the change in internal energy of an ideal gas when it expands isothermally? (2021)
  • A. Zero
  • B. Positive
  • C. Negative
  • D. Depends on the gas
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