📚 Boost your green chemistry knowledge with 25 multiple-choice questions (MCQs) and detailed answers. Perfect for students, exams, and quiz enthusiasts. 🌱 Take the quiz now!
1. What is the primary goal of green chemistry?
a) To increase chemical production
b) To reduce environmental impact of chemical processes
c) To increase the complexity of chemical reactions
d) To create more synthetic chemicals
✅ Answer: b) To reduce environmental impact of chemical processes
Explanation: Green chemistry focuses on designing chemical processes and products that minimize waste, reduce energy consumption, and avoid hazardous substances.
2. Which of the following is NOT a principle of green chemistry?
a) Atom economy
b) Use of renewable feedstocks
c) Use of toxic solvents
d) Design for degradation
✅ Answer: c) Use of toxic solvents
Explanation: Green chemistry encourages the use of safer solvents and reaction conditions to minimize environmental and health hazards.
3. Who introduced the 12 principles of green chemistry?
a) Antoine Lavoisier
b) Paul Anastas and John Warner
c) Linus Pauling
d) Marie Curie
✅ Answer: b) Paul Anastas and John Warner
Explanation: In 1998, Paul Anastas and John Warner formulated the 12 Principles of Green Chemistry to guide sustainable chemical design.
4. Which of the following is a green solvent?
a) Benzene
b) Carbon tetrachloride
c) Water
d) Chloroform
✅ Answer: c) Water
Explanation: Water is a non-toxic, non-volatile, and environmentally friendly solvent often used in green chemistry.
5. What does "atom economy" refer to?
a) The cost of atoms in a reaction
b) The efficiency of a reaction in incorporating all reactant atoms into the final product
c) The number of byproducts formed
d) The total mass of reactants used
✅ Answer: b) The efficiency of a reaction in incorporating all reactant atoms into the final product
Explanation: Atom economy is a key principle of green chemistry that aims to minimize waste by maximizing the use of all atoms in the final product.
6. Which renewable resource is commonly used in green chemistry?
a) Petroleum
b) Coal
c) Biomass
d) Uranium
✅ Answer: c) Biomass
Explanation: Biomass (such as plant-based materials) is a sustainable resource used to produce biofuels, bioplastics, and green chemicals.
7. Which of the following reactions follows the principle of green chemistry?
a) Using hazardous reagents to increase yield
b) Conducting reactions at room temperature using catalysis
c) Increasing reaction time to improve product purity
d) Using excess reactants to drive a reaction forward
✅ Answer: b) Conducting reactions at room temperature using catalysis
Explanation: Green chemistry promotes energy-efficient reactions and catalysts that lower activation energy without producing waste.
8. What is an example of a biodegradable polymer?
a) Polystyrene
b) Polyvinyl chloride (PVC)
c) Polylactic acid (PLA)
d) Nylon
✅ Answer: c) Polylactic acid (PLA)
Explanation: PLA is derived from corn starch or sugarcane and is biodegradable, making it a sustainable alternative to traditional plastics.
9. What is a green alternative to traditional petroleum-based fuels?
a) Diesel
b) Kerosene
c) Biodiesel
d) Coal
✅ Answer: c) Biodiesel
Explanation: Biodiesel, made from vegetable oils or animal fats, is a renewable and cleaner-burning alternative to petroleum diesel.
10. Which of the following is NOT a characteristic of green chemistry?
a) Prevention of waste
b) Designing safer chemicals
c) Increased use of hazardous reagents
d) Energy efficiency
✅ Answer: c) Increased use of hazardous reagents
Explanation: Green chemistry aims to minimize or eliminate hazardous substances in chemical processes.
11. Which of the following catalysts is considered green?
a) Palladium on carbon
b) Lead acetate
c) Mercury chloride
d) Hexavalent chromium compounds
✅ Answer: a) Palladium on carbon
Explanation: Palladium on carbon is a heterogeneous catalyst that is efficient and recyclable, making it an environmentally friendly option.
12. What is an advantage of using supercritical CO₂ as a solvent?
a) It is toxic
b) It requires high energy input
c) It is environmentally benign and easily recyclable
d) It generates hazardous waste
✅ Answer: c) It is environmentally benign and easily recyclable
Explanation: Supercritical CO₂ is a green solvent with low toxicity and can be used in extractions, polymer processing, and dry cleaning.
13. Which process is an example of green chemistry?
a) Haber process for ammonia
b) Photocatalytic water splitting
c) Lead-based paint production
d) Ozone depletion reactions
✅ Answer: b) Photocatalytic water splitting
Explanation: This process uses sunlight to split water into hydrogen and oxygen, providing a clean energy source.
14. What is an alternative to hazardous organic solvents?
a) Chloroform
b) Toluene
c) Ionic liquids
d) Benzene
✅ Answer: c) Ionic liquids
Explanation: Ionic liquids are non-volatile and recyclable, making them safer than traditional organic solvents.
15. Which of the following is a green route to synthesize ibuprofen?
a) Friedel-Crafts acylation
b) Hoechst-Celanese process
c) Buckley-Roberts process
d) BHC process
✅ Answer: d) BHC process
Explanation: The BHC process for ibuprofen synthesis has high atom economy, fewer byproducts, and uses catalytic steps.
16. What is an environmental benefit of biocatalysis?
a) Requires toxic reagents
b) Generates hazardous waste
c) Reduces energy consumption and waste production
d) Uses heavy metals
✅ Answer: c) Reduces energy consumption and waste production
Explanation: Biocatalysis uses enzymes for reactions, making processes more selective and reducing environmental impact.
17. Which material is an eco-friendly alternative to plastic?
a) Polyethylene
b) Polypropylene
c) Polylactic acid (PLA)
d) Polystyrene
✅ Answer: c) Polylactic acid (PLA)
Explanation: PLA is biodegradable and derived from renewable sources.
18. What is the principle behind green chemistry in energy usage?
a) Maximizing energy-intensive processes
b) Increasing reaction temperatures
c) Using energy-efficient reactions
d) Relying on fossil fuels
✅ Answer: c) Using energy-efficient reactions
Explanation: Green chemistry promotes reducing energy consumption by using catalysts, microwave reactions, and room-temperature processes.
19. Which green chemistry technique reduces waste production?
a) Batch processing
b) Atom economy
c) Using excess reagents
d) High-energy reactions
✅ Answer: b) Atom economy
Explanation: Atom economy ensures that most reactant atoms end up in the final product, minimizing waste.
20. Which industry benefits the most from green chemistry?
a) Agriculture
b) Pharmaceuticals
c) Energy
d) All of the above
✅ Answer: d) All of the above
Explanation: Green chemistry principles apply to various industries, reducing waste, improving efficiency, and promoting sustainability.
Most Important Question Answer
[A] Steroid
[B] Sedative
[C] Analgesic
[D] Hallucinogen
Answer: D [Hallucinogen]
2. Amalgam‘ is a term used for an alloy of a metal with:
[A] Copper
[B] Mercury
[C] Lead
[D] Aluminium
Answer: B [Mercury]
3. Gammaxene, D.D.T. and Bleaching powder are important compounds of :
[A] Chlorine
[B] Nitrogen
[C] Sulphur
[D] Phosphorus
Answer: A [Chlorine]
4. L.P.G. is a hydrocarbon consisting of a mixture of:
[A] Methane and Butane
[B] Propane and Butane
[C] Ethane and Propane
[D] Ethane and Butane
Answer: B [Propane and Butane]
5. Which among the following was first human-made plastic?
[A] Bakelite
[B] Polyethene
[C] Celluloid
[D] Nylon
Answer: C [Celluloid]
6. Which among the following is the correct impact of the London Forces in the Cycloalkanes?
[A] The melting and boiling points get increased
[B] The Melting and boiling points get decreased
[C] There is not impact on the melting and boiling points
[D] The melting point increases but boiling point decreases
Answer: A [The melting and boiling points get increased]
7. Gargling with a solution of table salt is known to provide relief for a sore throat because ___ ?
[A] It kills bacteria
[B] It works as analgesic
[C] It dehydrates water from inflammatory tissues by Osmosis
[D] Placebo effect
Answer: C [It dehydrates water from inflammatory tissues by Osmosis]
8. The Potassium graphite and Calcium Graphite can be mostly used as which among the
following?
[A] Moderators
[B] Semiconductors
[C] Superconductors
[D] Lubricants
Answer: C [Superconductors]
9. Which among the following minerals is also known as Horn Silver?
[A] Silver Iodide
[B] Silver Chroride
[C] Zinc Phosphate
[D] Silver Sulphide
Answer: B [Silver Chroride]
10. Consider the following particles in relation to the matter:
p-Meson (Pi-meson)
Photon
Which among the above are considered to be mass less and charge less?
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2
Answer: B [Only 2]
11. Polymetallic Modules (PMN) predominantly contain_____?
[A] Calcium
[B] Magnesium
[C] Manganese
[D] Copper
Answer: C [Manganese]
12. The colors in the fine cut diamond are because of which among the following?
[A] Variance in transparency of diamond
[B] Variance in index of refraction
[C] Presence of Impurities
[D] Existence of definite planer layers
Answer: C [Presence of Impurities
13. Benzoepin, Parrysulfan, Phaser, Thiodan, Thionex etc. are the names of which among the
following pesticides?
[A] Kepone
[B] Paraquat
[C] Endosulfan
[D] Toxaphene
Answer: C [Endosulfan]
14. An aqueous solution of Sodium Acetate will be of which among the following nature?
[A] Acidic
[B] Basic
[C] Neutral
[D] Either acidic or basic depending upon temperature of solution
Answer: B [Basic]
15. Aluminum is getting popular worldwide today as a ?Green Metal?. Which among the
following properties of Aluminum makes it a Green Metal?
[A] Aluminum has been providing a replacement of wood for saving forests and contributes in
environment protection
[B] Aluminum is a light metal and it is resistant to corrosion
[C] Aluminum has fairly high rate of recycling and it can be re-used repeatedly without its quality
deteriorating
[D] The lands after the Bauxite mining can be restored very quickly and easily
Answer: C [Aluminum has fairly high rate of recycling and it can be re-used repeatedly
without its quality deteriorating]
16. Acetylene cannot be safely pressurized as a pure compound. Which among the following is
used for safe storage and transportation of Acetylene?
[A] Kerosene
[B] Acetone
[C] Vinegar (Acetic Acid)
[D] Propylene glycol
Answer: B [Acetone]
17. Above 70 °C, sodium bicarbonate has a property of gradually decomposing, which makes it
usable in Bakery products. Which among the following end product of this Thermal
decomposition of Sodium bicarbonate makes it usable for the above purpose?
[A] Hydrogen
[B] Carbon Dioxide
[C] Water Vapor
[D] Sodium Carbonate
Answer: B [Carbon Dioxide]-
18. Which among the following substances is being used most commonly for producing
synthetic jet Fuel?
[A] Coal
[B] Natural Gas
[C] Plastic Waste
[D] Biomass
Answer: A [Coal]
19. A baby diaper, if tested with various solutions, will absorb maximum amount of which
among the following:
[A] Distill Water
[B] Drinking water
[C] Hard water
[D] Urine
Answer: A [Distill Water]
20. Consider the following statements:
1. The space between the valence and conduction bands is zero in Graphene
2. This property of Graphene makes it an excellent transistor of commercial viability
Which among the above statements is/ are correct?
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2
Answer: A [Only 1]
21. Pyrolusite, Braunite, Psilomelane and Rhodochrosite are the ores of which among the
following:
1. Manganese
2. Aluminium
3. Copper
Choose the correct option:
[A] Only 1
[B] Only 1 & 2
[C] Only 3
[D] Only 1 & 3
Answer: A [Only 1]
22. Consider the following statements:
1. Copernicium is at present highest-numbered element recognized by IUPAC
2. Copernicum has been synthesized in the lab by a nuclear reaction of Zinc and Lead Isotopes
Which among the above statements is / are correct?
[A] Only 1 is correct
[B] Only 2 is correct
[C] Both 1 & 2 are correct
[D] Neither 1 nor 2 are correct
Answer: C [Both 1 & 2 are correct]
23. The first metal to be used by man was:
[A] Aluminum
[B] copper
[C] Iron
[D] Silver
Answer: B [copper]
24. For respiration in deep sea, divers use mixture of:
[A] Oxygen and helium
[B] Oxygen and hydrogen
[C] Oxygen and carbon dioxide
[D] Oxygen, Helium & nitrogen
Answer: D [Oxygen, Helium & nitrogen]
25. The minimum temperature at which a combustible substance catches fire is called:
[A] fireless temperature
[B] ignition temperature
[C] static temperature
[D] optimum temperature
Answer: B [ignition temperature ]
26. Consider the following statements regarding Graphene and Fullerene:
1. Graphene is 2 dimensional , Fullerene is generally 3 dimensional
2. Graphene is SP2 allotrope of Carbon, while Fullerene is SP3 allotrope of Carbon
3. Graphene does not dissolve in petrol but fullerenes dissolve
Which among the above statements is / are correct?
[A] Only 1 is correct
[B] Only 2 is correct
[C] Only 3 is correct
[D] 1 & 3 are correct
Answer: D [1 & 3 are correct]
27. Haber Process is used to produce which among the following?
[A] Potash
[B] Ammonia
[C] Urea
[D] Nitrates
Answer: B [Ammonia]
28. If a Hydrogen atom is removed from a hydrocarbon of Benzene group, the remaining
residue is called _________?
[A] Alkyl
[B] Aryl
[C] Arene
[D] Azene
Answer: B [Aryl]
29. Which among the following kinds of Chemical reactions cause the rocks turn red or
yellowish?
[A] Hydration
[B] Oxidation
[C] Carbonation
[D] Exfoliation
Answer: B [Oxidation]
30. Which among the following is the unit of the scale used for measurement of the spicy heat
of a chili pepper?
[A] Smith
[B] Wright
[C] Orville
[D] Scoville
Answer: D [Scoville]
31. Every kilogram of seawater has approximately how much dissolved salts?
[A] 1 gm
[B] 0.35 gms
[C] 3.5 gms
[D] 35 gms
Answer: D [35 gms]
32. Gypsum is added to Cement so that, _________?
[A] setting of cement can be fastened
[B] setting of cement can be slowed
[C] Cement strength can be improved
[D] Cement strength can be controlled
Answer: B [setting of cement can be slowed]
33. The color ?Carmine? is a shade of which among the following colors?
[A] Red
[B] Blue
[C] Yellow
[D] Green
Answer: A [Red]
34. Consider the following:
Copper
Zinc
Tin
Gun Metal is the alloy of which among the above?
[A] 1 & 2
[B] 1 & 3
[C] 2 & 3
[D] 1, 2 & 3
Answer: D [1, 2 & 3]
35. Which among the following makes Chile saltpetre different from saltpetre?
[A] Nitrate
[B] Sodium
[C] Magnesium
[D] Calcium
Answer: B [Sodium]
