MCQ 51
Which gas law relates pressure and volume at constant temperature?
A) Charles’s Law
B) Boyle’s Law
C) Avogadro’s Law
D) Ideal Gas Law
Answer: B) Boyle’s Law.
Explanation: Boyle’s Law states that at constant temperature, the pressure and volume of a gas are inversely related.
MCQ 52
What happens to the pressure of a gas if its volume is decreased while temperature remains constant?
A) Pressure decreases.
B) Pressure increases.
C) Pressure remains the same.
D) Pressure fluctuates.
Answer: B) Pressure increases.
Explanation: According to Boyle’s Law, decreasing the volume of a gas at constant temperature increases its pressure.
MCQ 53
Which of the following is a characteristic of an ideal gas?
A) Atoms attract each other.
B) Volume of the gas particles is significant.
C) Collisions between particles are elastic.
D) Gas particles have a definite shape.
Answer: C) Collisions between particles are elastic.
Explanation: In an ideal gas, collisions between gas particles are considered elastic, meaning there is no loss of kinetic energy during the collision.
MCQ 54
In which process does a solid change directly to a gas?
A) Melting
B) Sublimation
C) Condensation
D) Freezing
Answer: B) Sublimation.
Explanation: Sublimation is the process where a solid transforms directly into a gas without passing through the liquid phase.
MCQ 55
Which of the following is a characteristic of metals?
A) Brittle and non-conductive
B) Malleable and ductile
C) Gaseous at room temperature
D) Poor conductors of heat
Answer: B) Malleable and ductile.
Explanation: Metals are typically malleable (can be shaped) and ductile (can be drawn into wires) and are good conductors of heat and electricity.
MCQ 56
Which of the following is NOT a diatomic molecule?
A) H₂
B) O₂
C) N₂
D) CO₂
Answer: D) CO₂.
Explanation: Carbon dioxide (CO₂) is a linear molecule made up of one carbon atom and two oxygen atoms, making it a triatomic molecule, while H₂, O₂, and N₂ are diatomic.
MCQ 57
What type of reaction occurs when an acid and a base react to form water and a salt?
A) Synthesis
B) Decomposition
C) Neutralization
D) Combustion
Answer: C) Neutralization.
Explanation: A neutralization reaction occurs when an acid reacts with a base, resulting in the formation of water and a salt.
MCQ 58
What is the pH of a neutral solution at 25°C?
A) 0
B) 7
C) 14
D) 10
Answer: B) 7.
Explanation: A neutral solution has a pH of 7 at 25°C, indicating equal concentrations of hydrogen ions (H⁺) and hydroxide ions (OH⁻).
MCQ 59
Which of the following elements has the highest ionization energy?
A) Sodium
B) Magnesium
C) Chlorine
D) Argon
Answer: D) Argon.
Explanation: Argon, being a noble gas, has a full outer shell, making it more stable and requiring more energy to remove an electron compared to other elements.
MCQ 60
Which of the following statements about acids is true?
A) Acids have a pH greater than 7.
B) Acids turn blue litmus paper red.
C) Acids are always weak electrolytes.
D) Acids contain hydroxide ions.
Answer: B) Acids turn blue litmus paper red.
Explanation: Acids turn blue litmus paper red, indicating their acidic nature. They typically have a pH less than 7.
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