Neutralization Practice Questions
20 free Neutralization practice questions for the General Science. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
What is neutralization?
- A A reaction between two metals that forms a new metallic alloy compound
- B A physical process used to separate sand particles from water completely
- C A chemical reaction between an acid and a base that forms salt and water
- D A chemical process that converts a liquid substance into a gaseous state
Correct answer: A chemical reaction between an acid and a base that forms salt and water
Neutralization is a chemical reaction in which an acid reacts with a base. The usual products are salt and water.
Which products are generally formed in a neutralization reaction?
- A Oxygen and hydrogen gas
- B A metal and carbon dioxide gases
- C Salt and water are the products
- D Sugar and alcohol only
Correct answer: Salt and water are the products
When an acid reacts with a base, the hydrogen ions from the acid combine with hydroxide ions from the base to form water. The remaining ions form a salt.
Which of the following is a correct example of neutralization?
- A NaCl + H2O → HCl + NaOH
- B C + O2 → CO2
- C HCl + NaOH → NaCl + H2O
- D Fe + O2 → Fe2O3
Correct answer: HCl + NaOH → NaCl + H2O
Hydrochloric acid reacts with sodium hydroxide to form sodium chloride and water. This is a classic example of an acid-base neutralization reaction.
In the reaction HCl + NaOH → NaCl + H2O, which substance is the salt?
- A HCl
- B NaOH
- C NaCl
- D H2O
Correct answer: NaCl
Sodium chloride, NaCl, is the salt formed in this reaction. It is produced from the sodium ion of the base and the chloride ion of the acid.
Which ion from an acid combines with hydroxide ion during neutralization to form water?
- A Chloride ion
- B Sodium ion
- C Hydrogen ion
- D Nitrate ion
Correct answer: Hydrogen ion
Acids produce hydrogen ions in aqueous solution. These hydrogen ions combine with hydroxide ions from bases to form water.
Which ion from a base combines with hydrogen ion during neutralization?
- A Carbonate ion
- B Sulphate ion
- C Chloride ion
- D Hydroxide ion
Correct answer: Hydroxide ion
Bases commonly provide hydroxide ions in aqueous solution. Hydrogen ions and hydroxide ions combine to produce water.
What is the approximate pH of a neutral solution at room temperature?
- A 1
- B 4
- C 7
- D 14
Correct answer: 7
A neutral solution has a pH of about 7 at room temperature. Pure water is a common example of a neutral substance.
Which of the following substances is commonly used to neutralize excess stomach acid?
- A Vinegar
- B Lemon juice
- C Antacid
- D Common salt
Correct answer: Antacid
Antacids are mild bases that neutralize excess hydrochloric acid in the stomach. This helps reduce acidity and indigestion.
Milk of magnesia helps relieve acidity because it is:
- A A strong acid
- B A neutral salt only
- C A form of sugar
- D A fairly mild base
Correct answer: A fairly mild base
Milk of magnesia contains magnesium hydroxide, which is a mild base. It neutralizes excess acid in the stomach without being too harsh.
Which substance is often applied to soil that is too acidic?
- A Diluted vinegar solution
- B Fresh lemon juice extract
- C Quicklime or slaked lime
- D Plain carbonated soda water
Correct answer: Quicklime or slaked lime
Acidic soil can be neutralized by adding basic substances such as quicklime or slaked lime. This helps make the soil more suitable for plant growth.
If soil is too basic, which substance may help neutralize it?
- A Slaked lime powder
- B Concentrated caustic soda
- C Organic matter or compost
- D Baking soda solution only
Correct answer: Organic matter or compost
Organic matter or compost can release mild acids during decomposition. These acids help reduce the basic nature of soil.
Which of the following is a natural acid that can be neutralized by a base?
- A Sodium chloride in salt
- B Oxygen in air
- C Acetic acid in vinegar
- D Iron in nails
Correct answer: Acetic acid in vinegar
Vinegar contains acetic acid, which can react with bases in neutralization reactions. Sodium chloride is a salt, while oxygen and iron are elements.
When an ant stings, it injects formic acid. Which substance can help neutralize the sting?
- A Fresh lemon juice
- B Diluted white vinegar
- C Baking soda solution
- D Concentrated hydrochloric acid
Correct answer: Baking soda solution
Baking soda is basic and can neutralize the formic acid in an ant sting. This may reduce the burning sensation caused by the acid.
A wasp sting is generally alkaline. Which substance may help neutralize it?
- A A baking soda paste
- B A soapy water solution
- C A diluted vinegar solution
- D Some powdered slaked lime mixture
Correct answer: A diluted vinegar solution
Vinegar contains acetic acid, which can neutralize alkaline substances. It may help reduce the effect of an alkaline wasp sting.
Which of the following indicators is commonly used to detect whether a solution is acidic or basic?
- A Sand paper
- B Filter paper only
- C Litmus paper
- D Wax paper
Correct answer: Litmus paper
Litmus paper is an indicator that changes color in acidic and basic solutions. Blue litmus turns red in acid, while red litmus turns blue in base.
What happens to the acidic character of a solution when a base is added gradually?
- A It always increases
- B It becomes more acidic forever
- C It gradually decreases
- D It turns into a metal
Correct answer: It gradually decreases
Adding a base neutralizes some of the acid present in the solution. As neutralization proceeds, the acidic character decreases.
Which statement best describes a salt formed in neutralization?
- A It is always only common table salt
- B It never contains any dissolved ions
- C It has ions from both a base and an acid
- D It is always released only as a gas product
Correct answer: It has ions from both a base and an acid
A salt is formed when ions from an acid and a base combine after water is produced. Common salt is only one example of a salt.
What type of reaction is neutralization generally considered?
- A Photosynthesis reaction
- B Nuclear reaction
- C Acid-base reaction
- D Only physical change
Correct answer: Acid-base reaction
Neutralization is an acid-base reaction because it involves the reaction of hydrogen ions with hydroxide ions. It results in the formation of water and a salt.
Why is neutralization useful in treating factory waste before release?
- A It always turns waste into pure oxygen
- B It removes all solid particles instantly and fully
- C It can reduce harmful acidity or basicity
- D It converts waste into food
Correct answer: It can reduce harmful acidity or basicity
Industrial waste may be too acidic or too basic and can harm living organisms. Neutralization helps adjust its pH closer to a safer range before disposal.
Which pair will most likely undergo a neutralization reaction?
- A Oxygen gas and nitrogen gas mixed together
- B Sugar fully dissolved in water
- C Hydrochloric acid and sodium hydroxide
- D Pieces of solid iron and copper
Correct answer: Hydrochloric acid and sodium hydroxide
Hydrochloric acid is an acid and sodium hydroxide is a base, so they react by neutralization. The reaction forms sodium chloride and water.