Everyday Chemistry — Set 1
Chemistry · रोजमर्रा का रसायन · Questions 1–10 of 50
Which chemical is commonly used as a rodenticide to control rats and mice?
Correct Answer: C. Zinc Phosphide
• **Zinc Phosphide** = is commonly used in practical applications. • **Toxicity** — highly effective against target organisms with minimal environmental persistence. • 💡 Wrong-option analysis: A: chemical compound but different type; B: chemical compound but different type; D: chemical compound but different type.
What is the primary chemical component of common glass used in windows?
Correct Answer: C. Silicon Dioxide
• **Silicon Dioxide** = is used for its specific properties and applications. • **Composition** — comprises approximately 70% of common glass formulations. • 💡 Wrong-option analysis: A: chemical compound but different type; B: chemical compound but different type; D: chemical compound but different type.
Which chemical is used to give a yellow color to firework displays?
Correct Answer: D. Sodium salts
• **Sodium 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 substance is added to LPG cylinders to detect gas leaks through its smell?
Correct Answer: A. Ethyl Mercaptan
• **Ethyl Mercaptan** = is added to provide specific functionality. • **Odorant** — has pungent sulfur smell detectable at very low concentrations. • 💡 Wrong-option analysis: B: incorrect choice for stated use; C: incorrect choice for stated use; D: incorrect choice for stated use.
Which chemical is widely used as a permanent ink for marking fingers during elections?
Correct Answer: A. Silver Nitrate
• **Silver Nitrate** = is commonly used in practical applications. • **Permanence** — creates water-resistant stains on skin that last for days. • 💡 Wrong-option analysis: B: chemical compound but different type; C: incorrect choice for stated use; D: chemical compound but different type.
Which type of plastic is commonly used to manufacture non-stick cookware coatings?
Correct Answer: C. Polytetrafluoroethylene
• **Polytetrafluoroethylene** = is used for its specific properties and applications. • **Chemical resistance** — exceptional inertness makes it ideal for cookware. • 💡 Wrong-option analysis: A: chemical compound but different type; B: incorrect choice for stated use; D: incorrect choice for stated use.
Which chemical is primarily responsible for the 'hardness' of water?
Correct Answer: A. Calcium and Magnesium salts
• **Calcium and Magnesium salts** = serves as the primary component or element. • **Ion concentration** — dissolved salts create temporary hardness in water. • 💡 Wrong-option analysis: B: different chemical category; C: different chemical category; D: different chemical category.
Which gas is used in the manufacture of vanaspati ghee from vegetable oils?
Correct Answer: C. Hydrogen
• **Hydrogen** = is used for its specific properties and applications. • **Hydrogenation** — gas is bubbled through oils with catalyst for saturation. • 💡 Wrong-option analysis: A: incorrect choice for stated use; B: incorrect choice for stated use; D: chemical compound but different type.
Which substance is commonly known as 'Milk of Magnesia' and used as an antacid?
Correct Answer: B. Magnesium Hydroxide
• **Magnesium Hydroxide** = is commonly used in practical applications. • **Key characteristic** — possesses unique properties for its intended use. • 💡 Wrong-option analysis: A: chemical compound but different type; C: chemical compound but different type; D: chemical compound but different type.
Which chemical is used as a dehydrating agent in desiccators to keep substances dry?
Correct Answer: D. Calcium Chloride
• **Calcium Chloride** = 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: incorrect choice for stated use.