30 Acid bases and salts class 10 mcq
Which of the following is not a characteristic of acids?
a) Sour taste
b) Turns litmus paper red,
c) Releases hydrogen gas when reacted with metals
d) Feels slippery
Answer: d) Feels slippery
Explanation: Acids do not feel slippery; instead, they have a characteristic sour taste.
Which of the following is a strong acid?
a) Vinegar (acetic acid)
b) Lemon juice (citric acid )
c) Hydrochloric acid (HCl)
d) Carbonic acid (H2CO3)
Answer: c) Hydrochloric acid (HCl)
Explanation: Hydrochloric acid is a strong acid that, dissociates completely in water, producing a large number of hydrogen ions.
The pH scale measures the concentration of:
a) Hydrogen ions (H+)
b) Hydroxide ions (OH-)
c) Sodium ions (Na+)
d) Calcium ions (Ca2+
Answer: a) Hydrogen ions (H+)
Explanation: The pH scale is a measure of the concentration of hydrogen ions in a solution, indicating its acidity or alkalinity.
Which of the following is a characteristic of bases
a) Bitter taste
b) Turns litmus paper blue
c) Reacts with acids to form salts,
d) All of the above
Answer: d) All of the above
Explanation: Bases have a bitter taste, turn litmus paper blue, and react with acids to form salts.
A substance that can act as both an acid and a base is called:
a) Neutral
b) Amphoteric
c) A salt
d) An indicator
Answer: b) Amphoteric
Explanation: An amphoteric substance can exhibit both acidic and basic properties depending on the conditions it is placed in.
Which of the following is a strong base
a) Sodium hydroxide (NaOH)
b) Ammonium hydroxide (NH4OH)
c) Calcium hydroxide (Ca(OH)2)
d) Carbonic acid (H2CO3)
Answer: a) Sodium hydroxide (NaOH),
Explanation:Strong basic sodium hydroxide totally dissociates in water, releasing a lot of hydroxide ions in the process.
How does a neutral solution measure in pH?
a) 0
b) 7
c) 14
d) It can vary
Answer: b) 7
Explanation: A neutral solution has a pH value of 7 indicating an equal concentration of hydrogen ions, (H+) and hydroxide ions (OH-) in the solution.
Which of the following is an example of a salt?
a) Sodium chloride (NaCl)
b) Nitric acid (HNO3)
c) Sulfuric acid (H2SO4)
d) Hydrochloric acid (HCl)
Answer: a Sodium chloride (NaCl).
Explanation: Sodium chloride is an example of a salt,formed when a base (sodium hydroxide) reacts with an acid (hydrochloric acid).
Which gas is liberated when an acid reacts with a metal?
a) Hydrogen gas (H2)
b) Oxygen gas (O2)
c) Carbon dioxide gas (CO2)
d) Nitrogen gas (N2)
Answer a) Hydrogen gas (H2)
Explanation: One of the reactions that occurs when an acid interacts with a metal is the production of hydrogen gas.
Which acid is present in ant bites and bee stings?
a) Formic acid
b) Acetic acid
c) Citric acid
d) Hydrochloric acid
Answer: a) Formic acid
Explanation: Formic acid is the acid present in ant bites and bee stings responsible for the characteristic burning sensation.
Which of the following is a weak acid?
a) Hydrochloric acid ,HCl
b) Nitric acid HNO3
c) Acetic acid (CH3COOH)
d) Sulfuric acid (H2SO4)
Answer: c Acetic acid (CH3COOH)
Explanation: Acetic acid is a weak acid that does not dissociate completely in water resulting in a lower concentration, of hydrogen ions.
What is the pH value of a strong acid
a) Less than 7
b) Equal to 7
c) Greater than 7
d) It can vary
Answer: a) Less than 7
Explanation: A strong acid has a pH value of less than 7 indicating a higher concentration of hydrogen ions and acidic nature
What is the pH value of a strong base
a) Less than 7
b) Equal to 7
c) Greater than 7
d) It can vary
Answer: c) Greater than 7
Explanation.A strong base has a pH value greater than 7 indicating a higher concentration, of hydroxide ions and alkaline nature.
Which of the following is an example of an indicator?
a) Litmus
b) Phenolphthalein
c) Methyl orange
d) All of the above
Answer: d) All of the above
Explanation: Litmus, phenolphthalein, and methyl orange are examples of indicators that change color depending on the acidity or alkalinity of a solution.
When an acid reacts with a metal carbonate, it produces:
a) Water and salt
b) Carbon dioxide gas, water, and salt
c) Carbon dioxide gas and water
d) Carbon dioxide gas and salt
Answer: c) Carbon dioxide gas and water
Explanation: When an acid reacts with a metal carbonate, it produces carbon dioxide gas and water as the products of the reaction.
CLICK HERE FOR MORE MCQ
Which acid is responsible, for the sour taste of citrus fruits?
a) Sulfuric acid
b) Nitric acid
c) Citric acid
d) Acetic acid
Answer: c) Citric acid
Explanation: Lemons, oranges, and grapefruits all have a sour flavour that is brought on by the presence of citric acid.
Which of the following is used as an antacid to neutralize excess stomach acid?
a) Sodium hydroxide
b) Magnesium hydroxide
c) Hydrochloric acid
d) Sulfuric acid
Answer: b) Magnesium hydroxide
Explanation: Magnesium hydroxide is commonly used as an antacid to neutralize excess stomach acid and provide relief from indigestion and heartburn.
Which gas is released when a metal reacts with an acid?
a) Oxygen gas (O2)
b) Nitrogen gas (N2)
c) Carbon, dioxide gas (CO2)
d) Hydrogen gas (H2)
Answer: d) Hydrogen gas (H2)
Explanation: When a metal reacts with an acid, it produces hydrogen gas as one of the products of the reaction.
What happens to the pH of a solution when an acid is added to it?
a) The pH increases
b) The pH decreases
c) The pH remains unchanged
d) It depends on the concentration of the acid
Answer: b) The pH decreases
Explanation: Adding an acid to a solution increases, the concentration of hydrogen ions, resulting in a decrease in pH and increased acidity.
What happens to the pH of a solution when a base is added to it?
a) The pH increases
b) The pH decreases
c) The pH remains unchanged
d) It depends on the concentration of the base
Answer: a) The pH increases
Explanation: Adding a base to a solution increases the concentration of hydroxide ions, resulting in an increase in pH and increased alkalinity.
Which of the following is an example of a natural indicator?
a) Litmus paper
b) Phenolphthalein
c) Methyl orange
d) Turmeric extract
Answer: d) Turmeric extract
Explanation: Turmeric extract is a natural indicator, that exhibits a color change depending on the pH of a solution.
Which acid is present in curd and sour milk?
a) Lactic acid
b) Acetic acid
c) Citric acid
d) Carbonic acid
Answer: a) Lactic acid
Explanation: Lactic acid is present in curd and sour milk, contributing to their sour taste.
Which of the following is not a property of acids
a) Conduct electricity
b) React with bases to form salts
c) React with metals to release hydrogen gas
d) Have a pH value greater than 7
Answer: d) Have a pH value greater than 7
Explanation: Acids have a pH value less than 7, indicating their acidic nature.
Which of the following is not a property of bases?
a) Conduct electricity
b) React with acids to form salts
c) React with metals to release hydrogen gas
d) Have a pH value greater than 7
Answer: c) React with metals to release hydrogen gas
Explanation: Bases do not react with metals to release hydrogen gas; instead, acids react with metals to produce hydrogen gas.
What is the color of litmus paper in an acidic solution?
a) Red
b) Blue
c) Green
d) It remains unchanged
Answer: a) Red
Explanation: Litmus paper turns red in the presence of an acidic solution, indicating its acidic nature.
What is the color of litmus paper in a basic solution
a) Red
b) Blue
c) Green
d) It remains unchanged
Answer: b) Blue
Explanation: Litmus paper turns blue in the presence of a basic solution, indicating its alkaline nature.
Which acid is present in vinegar?
a) Acetic acid
b) Hydrochloric acid
c) Sulfuric acid
d) Nitric acid
Answer: a) Acetic acid
Explanation: Acetic acid is the acid present in vinegar, giving it its sour taste and distinctive smell.
What is the pH value of an acidic solution?
a) Less than 7
b) Equal to 7
c) Greater than 7
d) It can vary
Answer: a) Less than 7
Explanation: An acidic solution has a pH value less than 7, indicating its acidic nature.
Which of the following is used as a fire extinguisher?
a) Sodium hydroxide
b) Calcium carbonate
c) Sodium bicarbonate
d) Sodium chloride
Answer: c) Sodium b icarbonate
Explanation: Sodium bicarbonate, also known as baking soda is commonly used as a fire extinguisher, to suppress small fires , by releasing carbon dioxide gas and smothering the flames.
Which acid is present in the stomach ?
a) Hydrochloric acid
b) Acetic acid
c) Sulfuric acid
d) Nitric acid
Answer: a) Hydrochloric acid
Explanation: Hydrochloric acid is present in the stomach, aiding in the digestion of food and creating an acidic environment necessary for the activation of digestive enzymes