Chemistry MCQ for JEE Mains with Solutions PDF 2025

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Chemistry MCQ for JEE Mains with Solutions PDF for Students

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Chloroform can be used as:

(a) Antibiotic

(b) Analgesic

(d) Antimalarial

Option c – Anaesthetic

The main source of carbon monoxide is:

(a) Transportation

(b) Fuel combustion

(d) Solid waste disposal

Option a – Transportation

Which of the following is caused by the higher concentration of nitrogen and phosphorus?

(a) Acidity

(b) Hardness

(d) Eutrophication

Option d – Eutrophication

White phosphorus is generally kept under:

(a) Alcohol

(b) Kerosene oil

(d) Glycerine

Option c – Water

Which of the following is used as an anesthetic?

(a) N₂O

(b) NO

(d) NH₃

Option b – NO

Dry ice is:

(a) Solid sulfur dioxide

(b) Dry carbon dioxide gas

(d) Solid ammonia

Option c – Solid carbon dioxide

Major gaseous pollution of the thermal power station is:

(a) NH₃

(b) CO₂

(d) H₂S

Option b – CO₂

Which one of the following is radioactive?

(a) Platinum

(b) Strontium

(d) Cesium

Option c – Thorium

Which of the following is used in making smoke bombs?

(a) Carbon

(b) Sulfur

(d) Phosphorus

Option a – Carbon

Galvanization is the:

(a) Deposition of copper on iron

(b) Deposition of zinc on iron

(d) Deposition of aluminum on iron

Option b – Deposition of zinc on iron

Which one of the following is found in kidney stones?

(a) Calcium acetate

(b) Sodium oxalate

(d) Calcium oxalate

Option d – Calcium oxalate

In a nuclear reactor, the material used for absorbing neutrons is:

(a) Lead

(b) Zinc

(d) Radium

Option c – Cadmium

Which of the following metals has the least melting point?

(a) Copper

(b) Gold

(d) Mercury

Option d – Mercury

The inert gas substituted for nitrogen in the air used by deep sea divers for breathing is:

(a) Argon

(b) Helium

(d) Krypton

Option b – Helium

Which of the following is the best fuel in terms of energy released per gram of fuel?

(a) Butane

(b) Methane

(d) Hydrogen

Option d – Hydrogen

Sodium carbonate is commonly known as:

(a) Caustic soda

(b) Baking soda

(d) Caustic potash

Option c – Washing soda

Which of the following is not a noble gas?

(a) Argon

(b) Helium

(d) Hydrogen

Option d – Hydrogen

Natural rubber is the polymer of:

(a) Ethylene

(b) Isoprene

(d) Butadiene

Option b – Isoprene

Mercury is a:

(a) Liquid metal

(b) Liquid non-metal

(d) Solid non-metal

Option a – Liquid metal

What is the most common salt in sea water?

(a) Sodium chloride

(b) Potassium sulphate

(d) Magnesium sulphate

Option a – Sodium chloride

Which of the following is not an anesthetic agent in surgical operations?

(a) Ether

(b) Nitrous oxide

(d) Chloroform

Option c – Acetone

Iron rusts quickly in:

(a) River water

(b) Sea water

(d) Distilled water

Option b – Sea water

Philosopher’s wool is:

(a) Zinc oxide

(b) Zinc carbonate

(d) Zinc blended

Option a – Zinc oxide

The chief source of Naphthalene is:

(a) Coal-tar

(b) Charcoal

(d) Diesel

Option a – Coal-tar

Heavy metal pollution of water is caused by:

(a) Wood burning

(b) Paints

(d) Domestic sewage

Option b – Paints

The purest form of water is:

(a) Tap water

(b) Ground water

(d) Distilled water

Option c – Rain water

Greenhouse effect is caused by:

(a) Carbon monoxide

(b) Nitrogen

(d) Nitrogen dioxide

Option c – Carbon dioxide

Aspirin is the common name of:

(a) Methyl salicylate

(b) Salicylic acid

(d) Salicylate

Option c – Acetyl salicylic acid

The strongest oxidizing agent among the following is:

(a) Oxygen

(b) Iodine

(d) Fluorine

Option d – Fluorine

Which gas emitted by power stations among the following is:

(a) Nitrogen

(b) Sulphur dioxide

(d) Helium

Option b – Sulphur dioxide

Which one of the following minerals is found in Monazite sand?

(a) Sodium

(b) Potassium

(d) Uranium

Option c – Thorium

Which of the following substances is highly plastic?

(a) Clay

(b) Mica

(d) Quartz

Option a – Clay

Which of the following is biodegradable?

(a) Plastic

(b) D.D.T

(d) Aluminium

Option c – Paper

The sewage obtained from water closets and urinals is known as:

(a) Garbage

(b) Sullage

(d) Industrial waste

Option c – Sanitary waste

The percentage of oxygen in air is approximately:

(a) 1%

(b) 21%

(d) 100%

Option b – 21%

Heating of an ore below its melting point in the absence of air is known as:

(a) Smelting

(b) Calcination

(d) Refining

Option b – Calcination

The pH of lemon juice is expected to be:

(a) Less than 7

(b) More than 7

(d) Nothing can be predicted

Option a – Less than 7

The wire of flash bulbs is made up of:

(a) Mg

(b) Ag

(d) Ba

Option a – Mg

The highest volume of gases in the lower atmosphere is comprised of:

(a) Oxygen

(b) Hydrogen

(d) Carbon dioxide

Option c – Nitrogen

A thick paste of cement, sand, and water is called:

(a) R. C. C.

(b) Mortar

(d) Concrete

Option b – Mortar

The metal used for making aircraft and rockets is:

(a) Lead

(b) Nickel

(d) Aluminium

Option c – Copper

The first organic compound synthesized in the laboratory was:

(a) Glucose

(b) Urea

(d) Lactic acid

Option b – Urea

Ultra-purification of a metal is done by:

(a) Leaching

(b) Smelting

(d) Zone melting

Option d – Zone melting

Name two elements that find wide application in the transistor industry:

(a) Silicon and Germanium

(b) Tungsten and Platinum

(d) Indium and Germanium

Option a – Silicon and Germanium

Uranium eventually decays into a stable isotope of:

(a) Thorium

(b) Lead

(d) Radium

Option b – Lead

Which of the following chemicals is responsible for depletion of the ozone layer in the atmosphere?

(a) Carbon dioxide

(b) Nitrous oxide

(d) Chlorofluorocarbons

Option d – Chlorofluorocarbons

Ultraviolet rays can be used in water treatment as:

(a) Precipitator

(b) Hydrolyser

(d) Flocculator

Option c – Disinfectant

The refrigerant ‘FREON’ is:

(a) Fluorspar and Felspar

(b) Calcium Tetra Fluoride

(d) Difluoro Dichloro Methane

Option d – Difluoro Dichloro Methane

Impure Camphor is purified by:

(a) Sublimation

(b) Steam distillation

(d) Fractional Crystallization

Option a – Sublimation

Radioactive disintegration of uranium ultimately results in the formation of:

(a) Lead

(b) Radium

(d) Thorium

Option a – Lead

Which of the following alloys is used in making magnets?

(a) Stainless steel

(b) Magnalium

(d) Alnico

Option d – Alnico

Which among the following is not a gemstone?

(a) Cat’s eye

(b) Opal

(d) Topaz

Option a – Cat’s eye

Which of the following is used as a lubricant in heavy machines?

(a) Sulphur

(b) Graphite

(d) Phosphorus

Option b – Graphite

Which of the following is a natural dye?

(a) Alizarin

(b) Crystal violet

(d) Phenolphthalein

Option a – Alizarin

Which of the following imparts deep blue color to glass?

(a) Nickel oxide

(b) Cobalt oxide

(d) Cupric oxide

Option a – Nickel oxide

The function of the skimming tank in sewage treatment is to remove:

(a) Suspended solids

(b) Oil and fatty substances

(d) Gritty substances

Option b – Oil and fatty substances

Nucleons are regarded as composite sub-particles known as:

(a) Photons

(b) Mesons

(d) Leptons

Option c – Quarks

Which of the following appeared to have a significant potential for accumulation through food chains?

(a) Lindane

(b) Carbaryl

(d) DDT

Option d – DDT

Which of the following is a natural dye?

(a) Alizarin

(b) Crystal violet

(d) Phenolphthalein

Option a – Alizarin

Drinking soda is –

(a) Neutral

(b) Acidic

(d) Oxidant

Option b – Acidic

‘Milk Sugar’ is –

(a) Maltose

(b) Sucrose

(d) Lactose

Option d – Lactose

Among the following, which is always found in a free state in nature?

(a) Silver

(b) Gold

(d) Sodium

Option b – Gold

Which type of radiations are absorbed by the upper layer of the atmosphere?

(a) Infrared

(b) Visible

(d) Ultraviolet

Option d – Ultraviolet

Slag is a name given for –

(a) Molten alumina

(b) Molten iron

(d) Molten calcium silicate

Option a – Molten alumina

Supersonic jets cause pollution by thinning of –

(a) CO₂ layer

(b) O₃ layer

(d) O₂ layer

Option b – O₃ layer

The chief constituent of vinegar is –

(a) Acetic acid

(b) Formic acid

(d) Salicylic acid

Option a – Acetic acid

Aspirin is chemically known as –

(a) Hydroxy salicylate

(b) Alkyl salicyclic acid

(d) Acetyl salicylic acid

Option d – Acetyl salicylic acid

Detergents clean surfaces on the principle of –

(a) Elasticity

(b) Viscosity

(d) Floatation

Option c – Surface tension

Denatured spirit is ethanol mixed with –

(a) Kerosene

(b) Petrol

(d) Pyridine

Option d – Pyridine

When Formaldehyde and Potassium hydroxide are heated, we get –

(a) Methyl alcohol

(b) Methane

(d) Ethyl formate

Option a – Methyl alcohol

Which one of the following organic compounds has a fruity smell?

(a) Ester

(b) Alcohol

(d) Aldehyde

Option a – Ester

Impure camphor is purified by –

(a) Sublimation

(b) Steam distillation

(d) Fractional crystallization

Option a – Sublimation

The wire of flash bulbs is made up of –

(a) Ba

(b) Ag

(d) Cu

Option c – Mg

Magnetite is –

(a) Fe3O4

(b) Fe₂O₃

(d) 2Fe₂O₃·H₂O

Option a – Fe3O4

The degree of dissociation of an electrolyte depends on –

(a) Atmospheric pressure

(b) Dilution

(d) Method of dissolution

Option b – Dilution

An example of a heterocyclic compound is –

(a) Furan

(b) Benzene

(d) Naphthalene

Option a – Furan

Sulphuric acid is –

(a) Monobasic

(b) Dibasic

(d) Tetrabasic

Option b – Dibasic

The filter over which sewage is sprinkled is called –

(a) Contact bed

(b) Percolating filter

(d) Intermittent filter

Option c – Trickling filter

Ozone hole formation is observed in –

(a) India

(b) Europe

(d) Africa

Option c – Antarctica

Saccharin is made up of –

(a) Phenol

(b) Butane

(d) Toluene

Option d – Toluene

Which of the following metals forms an amalgam with other metals?

(a) Lead

(b) Tin

(d) Mercury

Option d – Mercury

Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpaste?

(a) Saltpeter

(b) Sodium chloride

(d) Hydrogen peroxide

Option b – Sodium chloride

Type metal used in printing press is an alloy of –

(a) Lead and copper

(b) Lead and zinc

(d) Lead and antimony

Option c – Lead and bismuth

In electro-refining, the pure metal is deposited on –

(a) Cathode

(b) Anode

(d) Electrolyte

Option a – Cathode

Which is not an anesthetic agent in surgical operations?

(a) Ether

(b) Chloroform

(d) Nitrous oxide

Option c – Acetone

Sweat contains water and –

(a) Vinegar

(b) Salt

(d) Citric acid

Option b – Salt

Radiation that is not emitted during radioactivity is –

(a) Alpha rays (α-rays)

(b) Beta rays (β-rays)

(d) Cathode rays

Option d – Cathode rays

The compound that has the least value for the octane number is –

(a) n-Heptane

(b) Iso-octane

(d) 2,2-Dimethyl hexane

Option a – n-Heptane

The amount of oxygen in the atmosphere remains relatively constant because it is given off by –

(a) Animals

(b) Plants

(d) Oceans

Option b – Plants

The number of atoms present in one mole of a gas at STP is –

(a) 6.023 × 10²⁰

(b) 6.023 × 10²³

(d) 6.023 × 10²⁰

Option b – 6.023 × 10²³

Carborundum is another name for –

(a) Calcium oxide

(b) Silicon oxide

(d) Calcium carbide

Option c – Silicon carbide

Interveinal necrotic spots on leaves appear due to –

(a) SO₂ injury

(b) HF injury

(d) O₃ injury

Option a – SO₂ injury

The antiseptic compound present in Dettol is –

(a) Iodine

(b) Cresol

(d) Chloroxylenol

Option d – Chloroxylenol

Iodine value is used to estimate –

(a) Alkali content in oil

(b) Hydroxyl groups in oil

(d) Carboxylic groups in oil

Option c – Unsaturation in oil

Bayer’s reagent is –

(a) Bromine water

(b) Hydrogen peroxide

(d) Acidified potassium permanganate

Option c – Alkaline potassium permanganate

The polymer obtained by the condensation of hexamethylenediamine and adipic acid is –

(a) Terylene

(b) Bakelite

(d) Nylon 66

Option d – Nylon 66

The unit to measure the flow of water is –

(a) Ohm meter

(b) Millicurie

(d) Cusecs

Option d – Cusecs

Which of the following is colorless?

(a) Oxygen

(b) Sulfur

(d) Phosphorus

Option a – Oxygen

PVC is obtained by the polymerization of –

(a) Acetylene

(b) Propane

(d) Vinyl chloride

Option d – Vinyl chloride

Organic food is supposed to be better for human consumption because –

(a) It depends on chemicals and fertilizers that are expensive to buy

(b) It is grown without the use of chemical and synthetic pesticides

(d) It is grown in an airtight environment

Option c – It is grown in a glasshouse

The ‘King of Metals’ is –

(a) Iron

(b) Silver

(d) Aluminium

Option c – Gold

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