Everyday Chemistry — Set 4
Chemistry · रोजमर्रा का रसायन · Questions 31–40 of 50
Which chemical is used as the electrolyte in a common car battery?
Correct Answer: D. Sulfuric Acid
Sulfuric acid is the primary component of the liquid inside lead-acid batteries. It facilitates the flow of electrons between the lead plates to store and release energy. This acid is highly corrosive and requires careful handling during maintenance.
Which of the following is the main constituent of 'Natural Gas'?
Correct Answer: D. Methane
Methane typically makes up over ninety percent of natural gas found in underground reservoirs. It is a clean-burning fuel used for heating, cooking, and generating electricity. It is also a potent greenhouse gas if released directly into the atmosphere.
Which gas is used in fire extinguishers because it does not support combustion?
Correct Answer: D. Carbon Dioxide
Carbon dioxide displaces the oxygen surrounding a fire, effectively smothering the flames. It is stored under high pressure as a liquid and released as a heavy gas. It is particularly useful for electrical fires because it does not conduct electricity.
Which chemical is commonly known as 'Epsom Salt'?
Correct Answer: C. Magnesium Sulfate
Magnesium sulfate is a naturally occurring mineral used for its medicinal and therapeutic properties. It is often dissolved in bathwater to soothe muscle aches and reduce swelling. In agriculture, it is used to correct magnesium deficiency in soil.
Which substance is used to make the 'heads' of safety matches?
Correct Answer: A. Potassium Chlorate
Potassium chlorate acts as an oxidizing agent that provides oxygen for the combustion reaction. It is mixed with sulfur and glass powder on the match head to ensure steady burning. The reaction starts when the head is rubbed against the phosphorus on the box.
Which acid is found in citrus fruits like lemons and oranges?
Correct Answer: B. Citric Acid
Citric acid is a weak organic acid that serves as a natural preservative in fruits. It gives citrus fruits their characteristic tangy flavor and is widely used in the food industry. It is also used as a cleaning agent due to its ability to bind metals.
Which chemical is used in the manufacturing of soaps?
Correct Answer: C. Sodium Hydroxide
Sodium hydroxide, also known as caustic soda, is used in the process of saponification. It reacts with fats or oils to produce soap and glycerol. For liquid soaps, potassium hydroxide is typically used instead of sodium hydroxide.
Which form of carbon is used as a adsorbent to remove impurities from water?
Correct Answer: A. Activated Charcoal
Activated charcoal has a very high surface area with many small pores for trapping chemicals. It is used in water filters and gas masks to remove toxins and odors. It is also used in medical settings to treat certain types of poisoning.
Which chemical compound is the primary component of pearls?
Correct Answer: D. Calcium Carbonate
Pearls are composed mainly of calcium carbonate in a crystalline form called aragonite. This material is deposited by mollusks in thin layers around a small irritant. Because they are carbonate-based, pearls are susceptible to damage from acidic substances.
Which chemical is commonly used to disinfect drinking water in city supplies?
Correct Answer: A. Bleaching Powder
Bleaching powder, or calcium hypochlorite, releases chlorine which kills harmful microorganisms. It is a cost-effective method for mass water purification in municipal systems. It must be used in precise amounts to avoid unpleasant taste or health issues.