MCQ 61
Which of the following is a strong acid?
A) Acetic acid
B) Hydrochloric acid
C) Carbonic acid
D) Phosphoric acid
Answer: B) Hydrochloric acid.
MCQ 71
Which of the following processes involves the loss of electrons?
A) Reduction
B) Oxidation
C) Neutralization
D) Combustion
Answer: B) Oxidation.
Explanation: Oxidation is the process in which an atom, ion, or molecule loses electrons.
MCQ 72
In a redox reaction, the substance that is reduced is called the:
A) Reducing agent
B) Oxidizing agent
C) Reactant
D) Product
Answer: B) Oxidizing agent.
Explanation: The substance that gains electrons and is reduced is known as the oxidizing agent, as it facilitates the oxidation of another substance.
MCQ 73
Which of the following compounds is a strong electrolyte?
A) Sugar
B) Acetic acid
C) Sodium chloride
D) Ethanol
Answer: C) Sodium chloride.
Explanation: Sodium chloride (NaCl) completely dissociates into ions in solution, making it a strong electrolyte.
MCQ 74
Which of the following best describes a saturated solution?
A) Contains the maximum amount of solute at a given temperature.
B) Contains no solute.
C) Has a higher concentration of solute than the saturation point.
D) Contains an equal amount of solute and solvent.
Answer: A) Contains the maximum amount of solute at a given temperature.
Explanation: A saturated solution is one where no more solute can dissolve at a given temperature, meaning it has reached its saturation point.
MCQ 75
What type of bond is formed when electrons are transferred from one atom to another?
A) Covalent bond
B) Ionic bond
C) Metallic bond
D) Hydrogen bond
Answer: B) Ionic bond.
Explanation: An ionic bond is formed through the transfer of electrons, resulting in the attraction between positively and negatively charged ions.
MCQ 76
Which of the following is a characteristic of a covalent bond?
A) High melting and boiling points
B) Formation of anions and cations
C) Sharing of electron pairs
D) Conducts electricity in solution
Answer: C) Sharing of electron pairs.
Explanation: Covalent bonds involve the sharing of electron pairs between atoms, typically between nonmetals.
MCQ 77
What is the role of a catalyst in a chemical reaction?
A) Increases the activation energy
B) Decreases the rate of reaction
C) Lowers the activation energy
D) Is consumed in the reaction
Answer: C) Lowers the activation energy.
Explanation: A catalyst increases the rate of a chemical reaction by lowering the activation energy required for the reaction to occur.
MCQ 78
Which of the following is a property of a gas?
A) Has a definite shape
B) Has a definite volume
C) Expands to fill its container
D) Is incompressible
Answer: C) Expands to fill its container.
Explanation: Gases have no definite shape or volume and will expand to occupy the entire volume of their container.
MCQ 79
Which of the following statements is true about exothermic reactions?
A) They absorb heat from the surroundings.
B) They release heat to the surroundings.
C) They always produce gas.
D) They are endothermic.
Answer: B) They release heat to the surroundings.
Explanation: Exothermic reactions release heat, resulting in an increase in temperature of the surroundings.
MCQ 80
What type of bond forms between two metals?
A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Hydrogen bond
Answer: C) Metallic bond.
Explanation: Metallic bonds occur between metal atoms, characterized by a “sea of electrons” that allows for conductivity and malleability.
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