West Bengal Board Class 11 Chemistry Question Paper 2025

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West Bengal Board Class 11 Chemistry Question Paper. We covered all the West Bengal Board Class 11 Chemistry Question Paper MCQs in this post for free so that you can practice well for the exam.

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West Bengal Board Class 11 Chemistry Objective Question Paper for Students

Which compound is used in the thermal decomposition process for nickel purification?

(a) Nickel chloride

(b) Nickel azide

(d) Nickel hydride

Option c – Nickel carbonyl

Zone refining works on which fundamental principle?

(a) Impurities tend to dissolve more readily in the liquid phase than in the solid phase of the metal.

(b) Impurities tend to dissolve more readily in the solid phase than in the liquid phase.

(d) Both statements (a) and (c) are correct.

Option a – Impurities tend to dissolve more readily in the liquid phase than in the solid phase of the metal.

What type of materials can be efficiently purified using the zone refining technique?

(a) Semiconductor materials

(b) Ultra-pure metals

(d) All of the options above

Option d – All of the options above

Which of the following metals is not commonly extracted through electrolysis?

(a) Calcium

(b) Magnesium

(d) Aluminium

Option c – Chromium

Silver is refined by which metallurgical method?

(a) Liquation process

(b) Poling method

(d) van Arkel process

Option c – Cupellation technique

Which process is employed for the ultra-refinement of metals?

(a) Slugging

(b) Zone melting

(d) Leaching

Option b – Zone melting

Which element is highly reactive and is therefore stored in kerosene?

(a) Bromine

(b) Iodine

(d) Potassium

Option c – Sodium

Which nutrient element can be absorbed both as a positively and negatively charged ion?

(a) Calcium

(b) Sulfur

(d) Nitrogen

Option d – Nitrogen

The gas that dominates in the lower layers of the Earth’s atmosphere is:

(a) Nitrogen

(b) Carbon dioxide

(d) Oxygen

Option a – Nitrogen

Drugs containing antacids are used to treat which of the following conditions?

(a) Acne

(b) Vision disorders

(d) Stomach discomfort

Option d – Stomach discomfort

What is the composition of rectified spirit?

(a) Pure ethyl alcohol (100%)

(b) Ethanol with 95% concentration

(d) Methylated spirit

Option b – Ethanol with 95% concentration

Why does nitrogen have a higher ionization energy than oxygen?

(a) Its atomic radius is smaller

(b) It has a stronger nuclear pull

(d) It has a stable half-filled 2P orbital configuration

Option d – It has a stable half-filled 2P orbital configuration

Which is the method used for obtaining ultra-pure metals?

(a) Zone refining

(b) Smelting

(d) Slugging

Option a – Zone refining

What is the chemical name for the pesticide Gammexane?

(a) Toluene

(b) Aniline

(d) Benzene hexachloride

Option d – Benzene hexachloride

Why are some metals referred to as “heavy metals”?

(a) Due to their high atomic weight

(b) Because of their large atomic size

(d) Due to their large atomic numbers

Option a – Due to their high atomic weight

Which element shows properties of both metals and non-metals?

(a) Boron

(b) Carbon

(d) Argon

Option a – Boron

The green hue seen in fireworks is due to which element’s chloride salt?

(a) Calcium

(b) Sodium

(d) Strontium

Option c – Barium

Who is credited with proposing a model for atomic structure?

(a) Alfred Nobel

(b) Faraday

(d) Bohr and Rutherford

Option d – Bohr and Rutherford

Which metal can displace hydrogen from acid to form a salt?

(a) Silver

(b) Phosphorus

(d) Sulfur

Option c – Sodium

From the following, which is a metallic ore?

(a) Mica

(b) Quartz

(d) Sulfur

Option c – Sodium

Atomic clocks operate based on transitions in which element?

(a) Sodium

(b) Magnesium

(d) Caesium

Option d – Caesium

Which chemical is commonly used to enhance the strength and elasticity of rubber?

(a) Sponge

(b) Chlorine

(d) Polythene

Option c – Sulfur

Why are silver halides used in photographic films?

(a) They undergo reduction upon exposure to light

(b) They are completely colorless

(d) They dissolve easily in hypo solution

Option a – They undergo reduction upon exposure to light

If not all bullets are extracted from a wound, which metal could cause toxicity?

(a) Lead

(b) Iron

(d) Arsenic

Option d – Arsenic

Which chemical is often utilized to artificially induce rainfall?

(a) Sodium chloride

(b) Silver iodide

(d) All of these

Option b – Silver iodide

Which of these metals is capable of displacing copper from copper sulfate solution?

(a) Mercury

(b) Gold

(d) Platinum

Option c – Iron

Identify the unreactive gas among the following:

(a) Hydrogen

(b) Oxygen

(d) Carbon dioxide

Option c – Nitrogen

Brine refers to which type of water?

(a) Pure water

(b) Freshwater

(d) Water containing starch

Option c – Saline water

How is the fineness of gold typically expressed?

(a) 91.6 Carats

(b) 22 Carats

(d) 24 Carats

Option d – 24 Carats

What causes metals to appear shiny or lustrous?

(a) High polish of the surface

(b) Presence of microscopic cavities absorbing light

(d) Dense atomic packing

Option c – Light reflection due to mobile electrons

What is an emulsion in the context of colloids?

(a) A liquid dispersed in a gas

(b) A gas dispersed in a solid

(d) A gas dispersed in a liquid

Option c – A liquid dispersed in another liquid

Litmus is derived from which source?

(a) Fungus

(b) Alga

(d) Bacterium

Option c – Lichen

What is the most effective method to purify seawater?

(a) Evaporation

(b) Filtration

(d) Fractional distillation

Option c – Distillation

Which of the following gases is not naturally present in the atmosphere?

(a) Helium

(b) Chlorine

(d) None of these

Option b – Chlorine

Which of the following gases is flammable, similar to carbon monoxide?

(a) Hydrogen

(b) Nitrogen

(d) Helium

Option a – Hydrogen

What happens to the system’s energy when a chemical bond forms between atoms?

(a) It decreases

(b) It increases

(d) It stays constant

Option d – It stays constant

Which of the following minerals is free from oxygen?

(a) Bauxite

(b) Calcite

(d) Haematite

Option c – Cryolite

The device used to determine the acidity level in an aqueous solution is –

(a) Acid meter

(b) Ammeter

(d) Hygrometer

Option c – pH meter

Antacid tablets typically contain –

(a) Sodium, magnesium, and aluminium hydroxides

(b) Sodium and aluminium hydroxides

(d) Magnesium and aluminium hydroxides

Option d – Magnesium and aluminium hydroxides

Burning a candle is an example of –

(a) An exothermic process

(b) A physical transformation

(d) A photochemical reaction

Option a – An exothermic process

During electro-refining, pure metal accumulates on the –

(a) Anode

(b) Cathode

(d) Electrolyte

Option b – Cathode

Covering solid waste with a non-permeable layer is called –

(a) Capping

(b) Encapsulation

(d) Chemical fixation

Option c – Landfill

Among the naturally occurring elements, the heaviest is –

(a) Uranium

(b) Thorium

(d) Mercury

Option a – Uranium

Which acid serves as a catalyst in producing high-octane fuel?

(a) Sulfuric acid

(b) Hydrofluoric acid

(d) Hydrochloric acid

Option a – Sulfuric acid

The term slag refers to –

(a) Liquid iron

(b) Liquid alumina

(d) Liquid calcium silicate

Option b – Liquid alumina

Which fibre is least likely to ignite?

(a) Nylon

(b) Polyester

(d) Cotton

Option d – Cotton

Heavy water is chemically denoted as –

(a) H₂O

(b) H₂O₂

(d) HDO

Option c – D₂O

Air is considered saturated when –

(a) It is thickest

(b) It has the lowest pressure

(d) It holds the maximum amount of water vapour

Option d – It holds the maximum amount of water vapour

Chile saltpeter is commonly known as –

(a) Sodium nitrate

(b) Sodium nitrite

(d) Potassium nitrite

Option a – Sodium nitrate

A mammalian cell that matures without a nucleus is the –

(a) Sperm cell

(b) Lymphocyte

(d) Red blood cell

Option d – Red blood cell

The maximum allowed copper concentration in drinking water (mg/L) is –

(a) 0.05

(b) 0.01

(d) 2.0

Option c – 1.0

Black lung disease most commonly affects individuals working in –

(a) Organic solvent plants

(b) Coal mining

(d) Paint factories

Option b – Coal mining

Ruby and sapphire are primarily composed of the oxide of –

(a) Iron

(b) Copper

(d) Aluminium

Option d – Aluminium

Candle wax is chemically a blend of –

(a) Cyclic hydrocarbons

(b) Aromatic hydrocarbons

(d) Both straight-chain and aromatic hydrocarbons

Option c – Straight-chain hydrocarbons

Helium is preferred over hydrogen in balloons because it is –

(a) Lighter

(b) Chemically more stable

(d) Non-flammable

Option d – Non-flammable

Plaster of Paris is created by partially dehydrating –

(a) Ferrous sulfate

(b) Copper sulfate

(d) Magnesium sulfate

Option c – Gypsum

Which chemical is used to clean rust stains from fabrics?

(a) Lime

(b) Kerosene

(d) Oxalic acid

Option d – Oxalic acid

A cloud is best described as a colloid consisting of –

(a) Air dispersed in water

(b) Mist dispersed in water

(d) Fog dispersed in water

Option c – Water droplets dispersed in air

The Hamburger effect is also called the –

(a) Chloride shift

(b) Sodium pump

(d) Anaerobic conversion

Option a – Chloride shift

Which of the following is not classified as a precious or semi-precious gem?

(a) Ruby

(b) Emerald

(d) Pearl

Option d – Pearl

Quartz is primarily composed of –

(a) Calcium silicate

(b) Sodium silicate

(d) Sodium sulfate

Option b – Sodium silicate

Turning milk into curd involves the process of –

(a) Fermentation

(b) Retting

(d) Vernalization

Option a – Fermentation

Anaesthetics commonly used in medicine include the combination of –

(a) Nitrogen dioxide and ether

(b) Nitrous oxide and chloroform

(d) Chloroform and nitrogen dioxide

Option b – Nitrous oxide and chloroform

High-purity metals are obtained through the method of –

(a) Zone melting

(b) Slugging

(d) Smelting

Option a – Zone melting

Which of the following is considered a solution?

(a) A non-uniform mixture

(b) A chemically bonded compound

(d) A suspension

Option c – A uniform mixture

How can the carbon footprint be effectively reduced?

(a) Using public transportation

(b) Recycling materials

(d) All of the above

Option d – All of the above

Which aluminium compound is typically applied to stop bleeding?

(a) Potash alum

(b) Aluminium chloride

(d) Aluminium sulphate

Option d – Aluminium sulphate

What term refers to the electrochemical degradation of a metal?

(a) Scratching

(b) Corrosion

(d) Erosion

Option b – Corrosion

Which gas becomes lethal when coal is burned in an enclosed area?

(a) Methane

(b) Carbon dioxide

(d) Ethane

Option c – Carbon monoxide

The orientation of an atomic orbital is determined by which quantum number?

(a) Spin quantum number

(b) Magnetic quantum number

(d) Azimuthal quantum number

Option b – Magnetic quantum number

Which metal is primarily used in spacecraft for its heat resistance?

(a) Titanium

(b) Iron

(d) Nickel

Option a – Titanium

Synthetic detergents are primarily made from:

(a) Sodium palmitate

(b) Sodium stearate

(d) Sodium salt of benzene carboxylic acid

Option c – Sodium salt of benzene sulphonic acid

Which substance is useful in identifying soft versus hard water?

(a) Liquid soap

(b) Regular soap

(d) Diluted acid

Option c – Detergent

What is the process of heating an ore in the absence of air below its melting point?

(a) Calcination

(b) Roasting

(d) Refining

Option a – Calcination

What factor primarily influences how much an electrolyte dissociates?

(a) Air pressure

(b) Technique of mixing

(d) Level of dilution

Option d – Level of dilution

Which of the following is considered a trace element?

(a) Nitrogen

(b) Hydrogen

(d) Chlorine

Option d – Chlorine

Which metal is resistant to corrosion due to a protective oxide layer?

(a) Zinc

(b) Iron

(d) Aluminium

Option d – Aluminium

Which noble gas is known to form compounds under specific conditions?

(a) Argon

(b) Xenon

(d) Krypton

Option b – Xenon

Among the following, which has the highest electronegativity?

(a) Sodium

(b) Oxygen

(d) Chlorine

Option c – Fluorine

The primary gas found in biogas is:

(a) Butane

(b) Carbon dioxide

(d) Isobutane

Option c – Methane

The main pollutant released by vehicles contributing to air pollution is:

(a) Ozone

(b) Carbon monoxide

(d) Carbon dioxide

Option d – Carbon dioxide

The Bhopal disaster was caused by the leakage of:

(a) Nitrogen dioxide

(b) Sulfur dioxide

(d) Carbon dioxide

Option c – Methyl isocyanate

What type of fuel is typically used in today’s submarines?

(a) Coal

(b) Diesel

(d) Nuclear fuel

Option d – Nuclear fuel

Soap is made by heating caustic soda with:

(a) Fats

(b) Alcohol

(d) Kerosene oil

Option a – Fats

What acid gives ‘Coca Cola’ its tangy flavor?

(a) Formic acid

(b) Acetic acid

(d) Phosphoric acid

Option d – Phosphoric acid

Petroleum is primarily a mix of:

(a) Carbides

(b) Carbonates

(d) Carbohydrates

Option c – Hydrocarbons

What is the common name of sodium bicarbonate in the market?

(a) Baking soda

(b) Washing soda

(d) Bleaching powder

Option a – Baking soda

Which mineral is the principal ore for aluminium production?

(a) Bauxite

(b) Haematite

(d) Cryolite

Option a – Bauxite

What is the function of graphite in nuclear reactors?

(a) Fuel

(b) Moderator

(d) Lubricant

Option b – Moderator

Among the listed options, which gas has the highest energy content per unit?

(a) Water gas

(b) Natural gas

(d) Indane gas

Option d – Indane gas

What substance is used in photographic films?

(a) Sodium chloride

(b) Silver bromide

(d) Aluminium hydroxide

Option b – Silver bromide

Who proposed the Atomic Theory of matter?

(a) Newton

(b) Dalton

(d) Avogadro

Option b – Dalton

Which of the following materials does not actually contain silver?

(a) German silver

(b) Ruby silver

(d) Lunar caustic

Option a – German silver

Which element is classified as a noble gas?

(a) Helium

(b) Nitrogen

(d) Chlorine

Option a – Helium

What metal alloy is commonly used in heating elements like in electric irons?

(a) Nichrome

(b) Zinc

(d) Tungsten

Option a – Nichrome

What is the main mineral present in human bones and teeth?

(a) Calcium borate

(b) Calcium chloride

(d) Calcium phosphate

Option d – Calcium phosphate

Identify the substance that is not used as a fertilizer:

(a) Calcium sulphate

(b) Potassium nitrate

(d) Calcium ammonium nitrate

Option a – Calcium sulphate

What gas is used to fill most incandescent light bulbs?

(a) Argon

(b) Oxygen

(d) Carbon dioxide

Option a – Argon

Which element is essential for vulcanizing rubber?

(a) Silicon

(b) Bromine

(d) Phosphorus

Option c – Sulphur

Which particle listed is not a nucleon?

(a) Electron

(b) Proton

(d) Positron

Option d – Positron

What chemical is commonly found at the tip of a matchstick?

(a) Red phosphorus

(b) Phosphorus trichloride

(d) Phosphorus pentoxide

Option a – Red phosphorus

Which element is most prevalent in the human body?

(a) Iron

(b) Nitrogen

(d) Oxygen

Option d – Oxygen

Acid rain damages plant life due to the presence of:

(a) Ozone

(b) Carbon monoxide

(d) Sulphuric acid

Option d – Sulphuric acid

Which type of iron is the purest?

(a) Cast iron

(b) Wrought iron

(d) Pig iron

Option b – Wrought iron

What class of organic compounds includes all types of oils?

(a) Ester

(b) Protein

(d) Carbohydrate

Option c – Hydrocarbon

What acid is used in a typical lead-acid battery?

(a) Nitric acid

(b) Phosphoric acid

(d) Hydrochloric acid

Option c – Sulphuric acid

Which one of these is a carbohydrate?

(a) Hydrogen peroxide

(b) Cane sugar

(d) Turpentine

Option b – Cane sugar

Which of the following is not radioactive?

(a) Plutonium

(b) Uranium

(d) Zirconium

Option d – Zirconium

Milk is best described as a:

(a) Solution

(b) Mixture

(d) Suspension

Option c – Emulsion

Which gas is used in weather balloons?

(a) Air

(b) Nitrogen

(d) Helium

Option d – Helium

Stainless steel is typically formed by combining steel with:

(a) Chromium and Nickel

(b) Copper and Nickel

(d) Copper and Chromium

Option a – Chromium and Nickel

What is the hardest form of carbon?

(a) Coke

(b) Graphite

(d) Lamp black

Option c – Diamond

What substance builds up in muscles and leads to fatigue?

(a) Lactic acid

(b) Pyruvic acid

(d) Oxaloacetic acid

Option a – Lactic acid

What is the main component of LPG?

(a) Ethane

(b) Butane

(d) Propane

Option c – Methane

Which container is safest for storing concentrated sulphuric acid?

(a) Glass vessel

(b) Copper vessel

(d) Aluminium vessel

Option a – Glass vessel

Which alkali metal has the greatest specific heat?

(a) Lithium

(b) Potassium

(d) Caesium

Option a – Lithium

What compound is most widely used as a food preservative?

(a) Tartaric acid

(b) Sodium carbonate

(d) Sodium benzoate

Option d – Sodium benzoate

Which inert gas is most abundant in Earth’s atmosphere?

(a) Neon

(b) Argon

(d) Helium

Option b – Argon

What fuel powers atomic reactors?

(a) Uranium

(b) Coal

(d) Combustible gases

Option a – Uranium

What is the name of the process that removes hardness from water?

(a) Flocculation

(b) Filtration

(d) Water softening

Option d – Water softening

Where is India’s national chemistry laboratory located?

(a) Bangalore

(b) Pune

(d) Hyderabad

Option b – Pune

What material is used in making the core of lead pencils?

(a) Lead

(b) Mica

(d) Graphite

Option d – Graphite

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