Household Chemicals Practice Questions
20 free Household Chemicals 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.
Which common household substance is chemically known as sodium chloride?
- A Baking soda
- B Table salt
- C Washing soda
- D Vinegar
Correct answer: Table salt
Sodium chloride is the chemical name for table salt. It is widely used in cooking and food preservation. It consists of sodium and chlorine ions bonded together.
What is the main active ingredient in household vinegar?
- A Citric acid
- B Hydrochloric acid
- C Acetic acid
- D Sulfuric acid
Correct answer: Acetic acid
Vinegar primarily contains acetic acid diluted in water. Acetic acid gives vinegar its sour taste and cleaning properties. It is commonly used for cooking and as a mild disinfectant.
Baking soda is chemically known as:
- A Sodium carbonate powder
- B Sodium bicarbonate
- C Calcium carbonate
- D Ammonium chloride
Correct answer: Sodium bicarbonate
Baking soda is sodium bicarbonate (NaHCO3). It is used in baking because it releases carbon dioxide gas when heated or mixed with acids, causing dough to rise. It is also used as a mild cleaning agent.
Which gas is released when baking soda reacts with an acid like vinegar?
- A Oxygen molecules
- B Hydrogen gas
- C Carbon dioxide
- D Nitrogen gas
Correct answer: Carbon dioxide
When baking soda reacts with an acid, it produces carbon dioxide gas. This gas forms bubbles, causing effervescence. The reaction is commonly demonstrated in simple chemistry experiments.
Bleach used for household cleaning typically contains:
- A Sodium hypochlorite
- B Hydrogen peroxide solution
- C Ethyl alcohol
- D Ammonia solution
Correct answer: Sodium hypochlorite
Household bleach commonly contains sodium hypochlorite. It acts as a strong oxidizing agent, making it effective for disinfecting and whitening. It can kill many types of microorganisms.
Which household chemical is commonly used as an antiseptic and disinfectant in diluted form?
- A Ethyl alcohol
- B Sodium chloride
- C Glucose
- D Paraffin
Correct answer: Ethyl alcohol
Ethanol is widely used as an antiseptic and disinfectant. In appropriate concentrations, it can kill bacteria and viruses by denaturing proteins. It is commonly found in hand sanitizers.
Soap cleans by which chemical property?
- A Neutralization
- B Oxidation
- C Emulsification
- D Crystallization
Correct answer: Emulsification
Soap molecules have hydrophilic and hydrophobic ends, allowing them to emulsify grease and oils. This process traps dirt in micelles, which can then be rinsed away with water. Emulsification is key to cleaning action.
Washing soda is chemically known as:
- A Sodium carbonate
- B Sodium chloride
- C Potassium nitrate
- D Calcium hydroxide
Correct answer: Sodium carbonate
Washing soda is sodium carbonate (Na2CO3). It is used as a water softener and cleaning agent. It helps remove stains and improves the effectiveness of detergents.
Which chemical is commonly used in toothpaste to prevent tooth decay?
- A Fluoride
- B Sulfur
- C Chlorine
- D Carbon
Correct answer: Fluoride
Fluoride strengthens tooth enamel and helps prevent cavities. It promotes remineralization and reduces acid damage caused by bacteria. Many toothpastes contain fluoride compounds.
Ammonia solution used in cleaning is effective because it:
- A Acts as a strong acid
- B Reacts explosively with water
- C Dissolves grease and grime
- D Produces oxygen gas
Correct answer: Dissolves grease and grime
Ammonia solution is alkaline and helps dissolve grease and dirt. It is commonly used in glass cleaners and surface cleaners. Its cleaning ability comes from its chemical interaction with oily substances.
Which household chemical is commonly used to remove limescale deposits?
- A Sodium hydroxide
- B Acetic acid
- C Glucose
- D Paracetamol
Correct answer: Acetic acid
Acetic acid in vinegar can dissolve limescale, which mainly consists of calcium carbonate. The acid reacts with the carbonate to form soluble compounds. This makes it useful for descaling kettles and taps.
Hydrogen peroxide used at home acts primarily as a:
- A High-energy combustion fuel
- B Bleach and disinfectant
- C Artificial sweetener
- D Industrial lubricant
Correct answer: Bleach and disinfectant
Hydrogen peroxide is a mild antiseptic and bleaching agent. It releases oxygen when it decomposes, which helps kill bacteria. It is commonly used for wound cleaning and stain removal.
Which of the following is a common ingredient in glass cleaners?
- A Calcium carbonate
- B Ammonia solution
- C Sucrose
- D Sodium nitrate
Correct answer: Ammonia solution
Ammonia is often included in glass cleaners because it evaporates quickly and leaves no streaks. It effectively removes grease and dirt. This makes it ideal for cleaning windows and mirrors.
The pleasant smell in many household cleaning products is due to:
- A Esters and fragrances
- B Carbon monoxide emissions
- C Sulfur dioxide gas
- D Methane fumes
Correct answer: Esters and fragrances
Esters and other fragrance compounds are added to cleaning products to provide pleasant scents. These compounds are responsible for fruity or floral smells. They do not contribute to cleaning action but improve user experience.
Which substance is commonly used as a natural cleaning agent and deodorizer?
- A Baking soda
- B Lead oxide
- C Liquid mercury
- D Liquid chloroform
Correct answer: Baking soda
Baking soda neutralizes acids and absorbs odors, making it an effective deodorizer. It is also mildly abrasive, aiding in cleaning. Its safety and versatility make it popular in households.
Detergents differ from soaps mainly because they:
- A Do not form micelles
- B Work better in hard water
- C Are always acidic
- D Are completely insoluble in water
Correct answer: Work better in hard water
Detergents are synthetic cleaning agents that remain effective in hard water. Unlike soaps, they do not form insoluble scum with calcium and magnesium ions. This makes them more versatile for washing.
Which chemical property makes acids useful for cleaning metal surfaces?
- A Their ability to produce bases
- B Their neutral pH
- C Their reaction with metal oxides
- D Their inability to dissolve metal compounds
Correct answer: Their reaction with metal oxides
Acids can react with metal oxides, removing rust and tarnish. This chemical reaction helps clean metal surfaces. For example, dilute acids are used to remove corrosion.
Which household gas is commonly used for cooking in liquefied petroleum gas (LPG)?
- A Compressed methane gas
- B Propane and butane
- C Carbon dioxide gas
- D Nitrogen gas
Correct answer: Propane and butane
LPG mainly consists of propane and butane. These hydrocarbons are easily liquefied under pressure and provide efficient combustion. They are widely used for domestic cooking.
Which of the following is a common pH indicator found in many households?
- A Turmeric powder
- B Common table salt
- C White cane sugar
- D Fine sand
Correct answer: Turmeric powder
Turmeric acts as a natural pH indicator, turning reddish-brown in the presence of bases. It remains yellow in acidic and neutral solutions. This property is often demonstrated in school experiments.
Why should bleach and ammonia not be mixed?
- A They produce harmless water
- B They completely neutralize each other
- C They produce toxic chloramine gases
- D They form table salt
Correct answer: They produce toxic chloramine gases
Mixing bleach and ammonia produces toxic chloramine gases. These gases can cause respiratory irritation and serious health hazards. Therefore, they should never be combined.