Everyday Chemistry — Set 2
Chemistry · रोजमर्रा का रसायन · Questions 11–20 of 50
Which polymer is widely used to make disposable coffee cups and packaging foam?
Correct Answer: A. Polystyrene
• **Polystyrene** = is used for its specific properties and applications. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: B: incorrect choice for stated use; C: incorrect choice for stated use; D: incorrect choice for stated use.
Which chemical is commonly used in the 'breathalyzer' test to detect alcohol?
Correct Answer: D. Potassium Dichromate
• **Potassium Dichromate** = is used for its specific properties and applications. • **Odorant** — has pungent sulfur smell detectable at very low concentrations. • 💡 Wrong-option analysis: A: chemical compound but different type; B: chemical compound but different type; C: incorrect choice for stated use.
Which of the following is used as an artificial sweetener with zero calories?
Correct Answer: B. Aspartame
• **Aspartame** = is the correct answer to this question. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: A: incorrect choice for stated use; C: incorrect choice for stated use; D: incorrect choice for stated use.
Which chemical is the main component of 'plaster of Paris'?
Correct Answer: A. Calcium Sulfate Hemihydrate
• **Calcium Sulfate Hemihydrate** = is the primary chemical component. • **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 acid is present in the sting of ants and bees?
Correct Answer: C. Formic Acid
• **Formic Acid** = is the correct answer to this question. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: A: different chemical category; B: different chemical category; D: different chemical category.
Which gas is released when baking soda is mixed with vinegar?
Correct Answer: B. Carbon Dioxide
• **Carbon Dioxide** = is the correct answer to this question. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: A: incorrect choice for stated use; C: incorrect choice for stated use; D: incorrect choice for stated use.
Which material is used as the 'lead' in modern pencils?
Correct Answer: B. Graphite
• **Graphite** = is the correct answer to this question. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: A: incorrect choice for stated use; C: different metal element; D: incorrect choice for stated use.
Which chemical compound is used as a refrigerant in older refrigerators and air conditioners?
Correct Answer: C. Chlorofluorocarbons
• **Chlorofluorocarbons** = is the correct answer to this question. • **Chemical properties** — possesses specific reactivity and behavior. • 💡 Wrong-option analysis: A: incorrect choice for stated use; B: chemical compound but different type; D: chemical compound but different type.
Which of the following is used in the vulcanization of rubber to make it harder?
Correct Answer: C. Sulfur
• **Sulfur** = is used for its specific properties and applications. • **Ion concentration** — dissolved salts create temporary hardness in water. • 💡 Wrong-option analysis: A: incorrect choice for stated use; B: incorrect choice for stated use; D: incorrect choice for stated use.
Which substance is commonly used to purify swimming pool water by killing bacteria?
Correct Answer: D. Chlorine
• **Chlorine** = 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.