Man-Made Materials — Set 4
Chemistry · मानव निर्मित सामग्री · Questions 31–40 of 50
Which polymer is commonly used for making lightweight carry bags and grocery bags?
Correct Answer: B. Polyethylene
• **Polyethylene** = Polyethylene, specifically the Low-Density (LDPE) type, is flexible and moisture-resistant. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Polyvinyl chloride; C: Polyester; D: Polypropylene
The monomer of Natural Rubber is?
Correct Answer: C. Isoprene
• **Isoprene** = Isoprene is the organic compound that serves as the building block for natural rubber. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Styrene; B: Neoprene; D: Chloroprene
Which of the following is a nitrogen-based fertilizer?
Correct Answer: B. Urea
• **Urea** = Urea has the highest nitrogen content among all solid nitrogenous fertilizers in common use. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Gypsum; C: Superphosphate; D: Potash
The chemical name of 'Bleaching Powder' is?
Correct Answer: B. Calcium Oxychloride
• **Calcium Oxychloride** = Calcium oxychloride is produced by the action of chlorine gas on dry slaked lime. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Calcium Sulfate; C: Sodium Hypochlorite; D: Calcium Carbonate
Which gas is released when 'Baking Soda' reacts with vinegar?
Correct Answer: B. Carbon dioxide
• **Carbon dioxide** = Baking soda is a carbonate that reacts with the acetic acid in vinegar to produce gas bubbles. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Nitrogen; C: Hydrogen; D: Oxygen
What is the primary use of 'Zeolites' in everyday chemistry?
Correct Answer: C. Water softening
• **Water softening** = Zeolites are porous minerals that act as ion exchangers to remove calcium and magnesium from hard water. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Dyeing fabrics; B: Fuel production; D: Food flavoring
Which synthetic polymer is used to make soft drink crates and plastic furniture?
Correct Answer: A. Polypropylene
• **Polypropylene** = Polypropylene is a rugged plastic that is resistant to chemical solvents and fatigue. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Terylene; C: Polystyrene; D: Nylon
What is 'Galvanized Iron' coated with to prevent rusting?
Correct Answer: D. Zinc
• **Zinc** = Zinc acts as a sacrificial anode, corroding in place of the iron or steel it protects. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Chromium; B: Tin; C: Copper
Which acid is present in the lead-acid batteries used in cars?
Correct Answer: A. Sulfuric acid
• **Sulfuric acid** = Sulfuric acid serves as the electrolyte that allows ions to flow between the lead plates. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Hydrochloric acid; C: Phosphoric acid; D: Nitric acid
The material 'Cement' is primarily a mixture of silicates and aluminates of which metal?
Correct Answer: A. Calcium
• **Calcium** = Cement is made by heating a mixture of limestone (calcium carbonate) and clay. • **mass** — It reacts with water to form a hard, stone-like mass • 💡 Wrong-option analysis: B: Sodium; C: Potassium; D: Magnesium