Environmental and Industrial Chemistry MCQs 2026

Treating water by allowing suspended particles to settle is called

1. Asedimentation✓
2. Bchlorination✓
3. Caeration✓
4. Ddistillation✓

The manufacture of sulfuric acid, ammonia and cement are examples of

1. Abiological processes✓
2. Bnatural weathering✓
3. Cindustrial chemical processes✓
4. Dhousehold activities✓

The main component of natural gas used as an industrial fuel is

1. Aethane✓
2. Bmethane✓
3. Cpropane✓
4. Dbutane✓

Nitrogenous fertilizers such as urea supply the essential element

1. Aphosphorus✓
2. Bpotassium✓
3. Ccalcium✓
4. Dnitrogen✓

The colourless, poisonous gas from incomplete combustion of fuels is

1. Acarbon dioxide✓
2. Boxygen✓
3. Ccarbon monoxide✓
4. Dnitrogen✓

COD in water analysis stands for Chemical Oxygen

1. ADeficiency✓
2. BDemand✓
3. CDensity✓
4. DDioxide✓

Burning fossil fuels adds to the atmosphere large amounts of

1. Acarbon dioxide✓
2. Boxygen✓
3. Chelium✓
4. Dargon✓

Green chemistry mainly aims to

1. Aincrease pollution✓
2. Bwaste resources✓
3. Cuse more toxic solvents✓
4. Dreduce or prevent pollution✓

The industrial preparation of nitric acid from ammonia is called the

1. AContact process✓
2. BHaber process✓
3. COstwald process✓
4. DSolvay process✓

The greenhouse effect is worsened by rising gases such as CO2 and

1. Aoxygen✓
2. Bmethane✓
3. Cnitrogen✓
4. Dargon✓

Sewage treatment that uses microorganisms to break down waste is called

1. Abiological treatment✓
2. Bdistillation✓
3. Cfiltration only✓
4. Dchlorination only✓

The gas with a rotten-egg smell linked to some industrial pollution is

1. Acarbon dioxide✓
2. Bmethane✓
3. Coxygen✓
4. Dhydrogen sulfide✓

Recycling materials such as glass and metals helps to

1. Aincrease waste✓
2. Bwaste energy✓
3. Cconserve natural resources✓
4. Draise pollution✓

A biodegradable waste is one that can be broken down by

1. Aplastic✓
2. Bglass✓
3. Cmetal✓
4. Dmicroorganisms✓

The vehicle-emitted gas that reduces the oxygen-carrying capacity of blood is

1. Aoxygen✓
2. Bcarbon monoxide✓
3. Cnitrogen✓
4. Dhydrogen✓

The process used to soften hard water by removing calcium and magnesium ions is

1. Aion exchange✓
2. Bchlorination✓
3. Caeration✓
4. Dsedimentation✓

Which metal is a toxic heavy-metal water pollutant

1. Asodium✓
2. Blead✓
3. Cpotassium✓
4. Dcalcium✓

The process of removing salt from seawater to obtain fresh water is called

1. Afiltration✓
2. Bchlorination✓
3. Cdesalination✓
4. Dsedimentation✓

The main raw material for the manufacture of cement is

1. Alimestone✓
2. Bcommon salt✓
3. Csulfur✓
4. Dammonia✓

Petroleum is separated into useful fractions by

1. Afiltration✓
2. Bfractional distillation✓
3. Ccrystallisation✓
4. Devaporation✓

The lightest fraction obtained from the fractional distillation of petroleum is

1. Adiesel✓
2. Bkerosene✓
3. Cbitumen✓
4. Dpetroleum gas✓

Polythene (polyethylene) is a polymer made from

1. Apropene✓
2. Bstyrene✓
3. Cethene✓
4. Dbenzene✓

PVC, a common plastic, is made by polymerising

1. Avinyl chloride✓
2. Bethene✓
3. Cpropene✓
4. Dmethane✓

The gas responsible for ozone-layer depletion contains the element

1. Asulfur✓
2. Bcarbon✓
3. Cnitrogen✓
4. Dchlorine✓

The greenhouse gas nitrous oxide is mainly released from

1. Avolcanoes only✓
2. Bthe ocean✓
3. Cfertilizers and farming✓
4. Drainwater✓

Non-biodegradable waste includes materials such as

1. Avegetable peels✓
2. Bplastics✓
3. Cpaper✓
4. Dleaves✓

The most abundant gas in the Earth's atmosphere is

1. Aoxygen✓
2. Bcarbon dioxide✓
3. Cnitrogen✓
4. Dargon✓

The main greenhouse gas responsible for global warming is

1. Acarbon dioxide✓
2. Boxygen✓
3. Cnitrogen✓
4. Dhelium✓

The atmospheric layer that protects us from ultraviolet radiation is the

1. Anitrogen layer✓
2. Bozone layer✓
3. Ccarbon layer✓
4. Doxygen layer✓

Chemicals mainly responsible for ozone depletion are

1. Aoxides of iron✓
2. Bcarbonates✓
3. Cnitrates✓
4. Dchlorofluorocarbons (CFCs)✓

Acid rain is mainly caused by oxides of sulfur and

1. Acarbon✓
2. Bhydrogen✓
3. Csodium✓
4. Dnitrogen✓

The pH of acid rain is generally

1. Aequal to 7✓
2. Bbelow 7✓
3. Cabove 7✓
4. Dexactly 14✓

The Haber process is used to manufacture

1. Aammonia✓
2. Bsulfuric acid✓
3. Cnitric acid✓
4. Dcement✓

In the Haber process, nitrogen combines with

1. Aoxygen✓
2. Bchlorine✓
3. Chydrogen✓
4. Dcarbon✓

The Contact process is used to manufacture

1. Aammonia✓
2. Bnitric acid✓
3. Csulfuric acid✓
4. Dsodium carbonate✓

The catalyst used in the Contact process is

1. Avanadium pentoxide (V2O5)✓
2. Biron✓
3. Cnickel✓
4. Dplatinum only✓

The catalyst used in the Haber process is finely divided

1. Anickel✓
2. Biron✓
3. Ccopper✓
4. Dzinc✓

The Solvay process is used to manufacture

1. Aammonia✓
2. Bsulfuric acid✓
3. Cnitric acid✓
4. Dsodium carbonate (washing soda)✓

The gas released by burning fossil fuels that causes the greenhouse effect is

1. Acarbon dioxide✓
2. Bnitrogen✓
3. Chydrogen✓
4. Dneon✓

A major water pollutant from untreated sewage that lowers dissolved oxygen is

1. Asand✓
2. Bplastic✓
3. Corganic waste✓
4. Dglass✓

BOD stands for Biochemical Oxygen

1. ADeficiency✓
2. BDemand✓
3. CDensity✓
4. DDioxide✓

The excessive growth of algae in water due to nutrient pollution is called

1. Afermentation✓
2. Bchlorination✓
3. Cfiltration✓
4. Deutrophication✓

The chemical commonly added to drinking water to kill germs is

1. Aammonia✓
2. Bcarbon dioxide✓
3. Cchlorine✓
4. Dnitrogen✓

Photochemical smog is mainly formed from vehicle emissions and

1. Asunlight✓
2. Brainfall✓
3. Csnow✓
4. Ddarkness✓

A greenhouse gas released mainly from paddy fields and livestock is

1. Aoxygen✓
2. Bargon✓
3. Cneon✓
4. Dmethane✓