Everyday Chemistry — Set 3
Chemistry · रोजमर्रा का रसायन · Questions 21–30 of 50
Which chemical is the primary ingredient in common laundry bleach?
Correct Answer: A. Sodium Hypochlorite
• **Sodium Hypochlorite** = is commonly used in practical applications. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: B: chemical compound but different type; C: chemical compound but different type; D: chemical compound but different type.
Which metal is used as a coating on galvanized iron to prevent rusting?
Correct Answer: C. Zinc
• **Zinc** = is the correct answer to this question. • **Chemical resistance** — exceptional inertness makes it ideal for cookware. • 💡 Wrong-option analysis: A: different metal element; B: different metal element; D: incorrect choice for stated use.
Which gas is responsible for the 'rotten egg' smell near sewage or volcanic vents?
Correct Answer: C. Hydrogen Sulfide
• **Hydrogen Sulfide** = is the correct answer to this question. • **Odorant** — has pungent sulfur smell detectable at very low concentrations. • 💡 Wrong-option analysis: A: incorrect choice for stated use; B: chemical compound but different type; D: chemical compound but different type.
Which organic compound is commonly known as 'Wood Alcohol'?
Correct Answer: B. Methanol
• **Methanol** = is commonly used in practical applications. • **Chemical properties** — possesses specific reactivity and behavior. • 💡 Wrong-option analysis: A: incorrect choice for stated use; C: incorrect choice for stated use; D: incorrect choice for stated use.
Which of the following is used in the manufacture of matches?
Correct Answer: D. Red Phosphorus
• **Red Phosphorus** = is used for its specific properties and applications. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: A: incorrect choice for stated use; B: incorrect choice for stated use; C: incorrect choice for stated use.
Which chemical is used to give a green color to firework displays?
Correct Answer: D. Barium salts
• **Barium salts** = is used for its specific properties and applications. • **Light emission** — produces distinct, visible spectral lines when heated. • 💡 Wrong-option analysis: A: different chemical category; B: different chemical category; C: different chemical category.
Which chemical is often used as a preservative in processed fruit juices and jams?
Correct Answer: D. Sodium Benzoate
• **Sodium Benzoate** = is the correct answer to this question. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: A: chemical compound but different type; B: chemical compound but different type; C: chemical compound but different type.
Which material is primarily used to make the filament of an incandescent light bulb?
Correct Answer: C. Tungsten
• **Tungsten** = is used for its specific properties and applications. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: A: different metal element; B: different metal element; D: different metal element.
Which substance is added to table salt to prevent a specific nutritional deficiency?
Correct Answer: D. Iodine
• **Iodine** = is added to provide specific functionality. • **Chemical properties** — possesses specific reactivity and behavior. • 💡 Wrong-option analysis: A: different metal element; B: incorrect choice for stated use; C: different metal element.
What is the common name for Sodium Bicarbonate used in kitchens?
Correct Answer: C. Baking Soda
• **Baking Soda** = is used for its specific properties and applications. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: A: incorrect choice for stated use; B: incorrect choice for stated use; D: incorrect choice for stated use.