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
Nickel is purified by thermal decomposition of its
(a) chloride
(b) azide
(c) carbonyl
(d) hydride
Option c – carbonyl
The zone refining method of the metals is based on the principle that ( West Bengal Board Class 11 Chemistry Question Paper )
(a) impurities are more soluble in the melt than in the solid state of the metal.
(b) impurities are less soluble in the melt than in the solid state of the metal.
(c) metal should be volatile.
(d) Both (a) and (c)
Option a – impurities are more soluble in the melt than in the solid state of the metal
Zone refining method is very useful for producing
(a) semiconductors
(b) metals of very high purity
(c) germanium
(d) All of the above
Option d – All of the above
Which metal can’t be obtained from electrolysis? ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Ca
(b) Mg
(c) Cr
(d) Al
Option c – Cr
Refining of silver is done by
(a) liquation
(b) poling
(c) cupellation
(d) van Arkel method
Option c – cupellation
Ultra-purification of a metal is done by ( West Bengal Board Class 11 Chemistry Question Paper )
(a) slugging
(b) zone melting
(c) smelting
(d) leaching
Option b – zone melting
Which of the following is very reactive and is kept in kerosene?
(a) Bromine
(b) Iodine
(c) Sodium
(d) Potassium
Option c – Sodium
The element absorbed both in cation and anion form is ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Calcium
(b) Sulfur
(c) Phosphorus
(d) Nitrogen
Option d – Nitrogen
The highest volume of gases in the lower atmosphere is comprised of –
(a) Nitrogen
(b) Carbon dioxide
(c) Hydrogen
(d) Oxygen
Option a – Nitrogen
Antacids are found in drugs that give relief to ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Acne
(b) Eyesight problems
(c) Headache
(d) Stomach ache
Option d – Stomach ache
Rectified spirit is –
(a) 100% Ethyl alcohol
(b) 95% Ethyl alcohol
(c) Tincture iodine
(d) Methylated spirit
Option b – 95% Ethyl alcohol
Ionization energy of nitrogen is greater than that of oxygen because nitrogen has ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Smaller atomic radius
(b) High nuclear charge
(c) High bond dissociation energy
(d) Stable half-filled 2P sublevel
Option d – Stable half-filled 2P sublevel
Ultra-purification of a metal is done by –
(a) Zone melting
(b) Smelting
(c) Leaching
(d) Slugging
Option a – Zone melting
The chemical name of Gammexane is ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Toluene
(b) Aniline
(c) Chlorobenzene
(d) Benzene hexachloride
Option d – Benzene hexachloride
Heavy metals get their name because compared to other atoms they have –
(a) Higher atomic masses
(b) Higher atomic radii
(c) Higher densities
(d) Higher atomic numbers
Option a – Higher atomic masses
Which element behaves chemically both as a metal and a non-metal? ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Boron
(b) Carbon
(c) Xenon
(d) Argon
Option a – Boron
The green color seen in fireworks displays is due to the chloride salt of –
(a) Calcium
(b) Sodium
(c) Barium
(d) Strontium
Option c – Barium
Who developed the model of atomic structure? ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Alfred Nobel
(b) Faraday
(c) Volta
(d) Bohr and Rutherford
Option d – Bohr and Rutherford
Which of the following will replace hydrogen from acids to form salts?
(a) Ag
(b) P
(c) Na
(d) S
Option c – Na
Which of the following is a metallic ore? ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Mica
(b) Quartz
(c) Na
(d) Sulfur
Option c – Na
An atomic clock is based on transitions in –
(a) Sodium
(b) Magnesium
(c) Aluminium
(d) Caesium
Option d – Caesium
The substance added to make natural rubber strong and more bouncy is ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Sponge
(b) Chlorine
(c) Sulfur
(d) Polythene
Option c – Sulfur
Silver halides are used in photographic plates because they are –
(a) Reduced by light
(b) Totally colorless
(c) Oxidized in air
(d) Soluble in hypo solution
Option a – Reduced by light
If all bullets could not be removed from a gunshot injury, it may cause poisoning by ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Lead
(b) Iron
(c) Mercury
(d) Arsenic
Option d – Arsenic
The chemical most commonly used for artificial rainmaking is –
(a) Sodium chloride
(b) Silver iodide
(c) Dry ice or frozen carbon dioxide
(d) All of these
Option b – Silver iodide
Which of the following metals can deposit copper from copper sulfate solution? ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Mercury
(b) Gold
(c) Iron
(d) Platinum
Option c – Iron
The name of an unreactive gas is –
(a) Hydrogen
(b) Oxygen
(c) Nitrogen
(d) Carbon dioxide
Option c – Nitrogen
Brine refers to ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Pure water
(b) Sweet water
(c) Salt water
(d) Starch water
Option c – Salt water
The purity of gold is expressed in carats. The purest form of gold is ( West Bengal Board Class 11 Chemistry Question Paper )
(a) 91.6 Carats
(b) 22 Carats
(c) 99.6 Carats
(d) 24 Carats
Option d – 24 Carats
The lustre of metals is due to –
(a) High polish
(b) Absorption of light due to the presence of cavities
(c) Reflection of light due to the presence of free electrons
(d) High density due to closed packing of atoms
Option c – Reflection of light due to the presence of free electrons
An emulsion is a colloid of ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Liquid in a gas
(b) Gas in a solid
(c) Liquid in a liquid
(d) Gas in a liquid
Option c – Liquid in a liquid
Litmus is obtained from –
(a) A fungus
(b) An alga
(c) Lichen
(d) Bacterium
Option c – Lichen
Sea water can be purified by the process of ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Evaporation
(b) Filtration
(c) Distillation
(d) Fractional distillation
Option c – Distillation
Which gas does not form a part of the atmosphere?
(a) Helium
(b) Chlorine
(c) Nitrogen
(d) None of these
Option b – Chlorine
Carbon monoxide is an inflammable gas. Which one of the following is also inflammable? ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Hydrogen
(b) Nitrogen
(c) Oxygen
(d) Helium
Option a – Hydrogen
When a bond is formed between two atoms, the energy of the system will –
(a) Decrease
(b) Increase
(c) May increase or decrease
(d) Remain the same
Option d – Remain the same
Which of the following minerals does not contain oxygen? ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Bauxite
(b) Calcite
(c) Cryolite
(d) Haematite
Option c – Cryolite
The apparatus used to test the acidity of an aqueous solution is –
(a) Acid meter
(b) Ammeter
(c) pH meter
(d) Hygrometer
Option c – pH meter
An antacid tablet consists of ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Hydroxides of sodium, magnesium, and aluminium
(b) Hydroxides of sodium and aluminium
(c) Hydroxides of magnesium and sodium
(d) Hydroxides of magnesium and aluminium
Option d – Hydroxides of magnesium and aluminium
Combustion of a candle is a/an –
(a) Exothermic reaction
(b) Physical change
(c) Endothermic reaction
(d) Photochemical reaction
Option a – Exothermic reaction
In electro-refining, the pure metal is deposited on ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Anode
(b) Cathode
(c) Vessel
(d) Electrolyte
Option b – Cathode
Coating of solid waste with an impervious material is known as –
(a) Capping
(b) Encapsulation
(c) Landfill
(d) Chemical fixation
Option c – Landfill
The heaviest naturally occurring element is ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Uranium
(b) Thorium
(c) Polonium
(d) Mercury
Option a – Uranium
Which among the following is used as a catalyst in the production of high-octane fuels?
(a) H₂SO₄
(b) HF
(c) HNO₃
(d) HCl
Option a – H₂SO₄
Slag is the name given for ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Molten iron
(b) Molten alumina
(c) Molten sand
(d) Molten calcium silicate
Option b – Molten alumina
The fibre least prone to catch fire is –
(a) Nylon
(b) Polyester
(c) Terylene
(d) Cotton
Option d – Cotton
The chemical composition of heavy water is ( West Bengal Board Class 11 Chemistry Question Paper )
(a) H₂O
(b) H₂O₂
(c) D₂O
(d) HDO
Option c – D₂O
Air is said to be saturated when –
(a) Its thickness is maximum
(b) Its pressure is minimum
(c) It blows over the barren land
(d) It contains the maximum content of water vapour
Option d – It contains the maximum content of water vapour
Chile saltpeter is the common name of ( West Bengal Board Class 11 Chemistry Question Paper )
(a) Sodium nitrate
(b) Sodium nitrite
(c) Potassium nitrate
(d) Potassium nitrite
Option a – Sodium nitrate
A matured mammalian cell without a nucleus is –
(a) Spermatozoan
(b) Lymphocyte
(c) Oocyte
(d) Erythrocyte
Option d – Erythrocyte
The maximum permissible concentration of copper in drinking water (mg/L) is –
(a) 0.05
(b) 0.01
(c) 1.0
(d) 2.0
Option c – 1.0
Black lung disease occurs in people working in –
(a) Organic solvent industry
(b) Coal mines
(c) Electroplating industry
(d) Paint manufacturing industry
Option b – Coal mines
Ruby and sapphire are oxides of –
(a) Iron
(b) Copper
(c) Tin
(d) Aluminium
Option d – Aluminium
Wax used for making a candle is chemically a mixture of –
(a) Cyclic hydrocarbons
(b) Aromatic hydrocarbons
(c) Aliphatic hydrocarbons
(d) Aliphatic & aromatic hydrocarbons
Option c – Aliphatic hydrocarbons
Helium gas is used in gas balloons instead of hydrogen gas because it is –
(a) Lighter than hydrogen
(b) More stable
(c) More abundant than hydrogen
(d) Non-combustible
Option d – Non-combustible
Plaster of Paris is made by the partial dehydration of –
(a) Green vitriol
(b) Blue vitriol
(c) Gypsum salt
(d) Epsom salt
Option c – Gypsum salt
Which of the following is used to remove rust stains on cloth?
(a) Lime
(b) Kerosene
(c) Petrol
(d) Oxalic acid solution
Option d – Oxalic acid solution
Cloud is a colloidal dispersion of –
(a) Air in a dispersion medium of water
(b) Mist in a dispersion medium of water
(c) Water drops in a dispersion medium of air
(d) Fog in a dispersion medium of water
Option c – Water drops in a dispersion medium of air
Humberger effect is otherwise known as –
(a) Chloride shift
(b) Sodium pump
(c) Respiratory product
(d) Anaerobic metabolism
Option a – Chloride shift
Which of the following is not a precious/semi-precious stone?
(a) Ruby
(b) Emerald
(c) Sapphire
(d) Pearl
Option d – Pearl
Quartz is made of –
(a) Calcium silicate
(b) Sodium silicate
(c) Calcium sulphate
(d) Sodium sulphate
Option b – Sodium silicate
The process by which milk is converted to curd is called –
(a) Fermentation
(b) Retting
(c) Pasteurization
(d) Vernalization
Option a – Fermentation
The pair of compounds used as anaesthetics in medicines is –
(a) Nitrogen dioxide, ether
(b) Nitrous oxide, chloroform
(c) Ether, ammonia
(d) Chloroform, Nitrogen dioxide
Option b – Nitrous oxide, chloroform
Ultra purification of a metal is done by –
(a) Zone melting
(b) Slugging
(c) Leaching
(d) Smelting
Option a – Zone melting
Which one of the following is known as a solution?
(a) A heterogeneous mixture
(b) A compound
(c) A homogeneous
(d) A suspension
Option c – A homogeneous
Carbon footprint can be reduced by –
(a) Commuting by public transport
(b) Recycling waste material
(c) Using energy-efficient appliances
(d) All of these
Option d – All of these
The aluminium salt commonly used to stop bleeding is –
(a) Potash alum
(b) Aluminium chloride
(c) Aluminium nitrate
(d) Aluminium sulphate
Option d – Aluminium sulphate
The deterioration of a metal by an electrochemical process is commonly termed as –
(a) Abrasion
(b) Corrosion
(c) Passivation
(d) Erosion
Option b – Corrosion
The gas that causes death when coke or coal is burnt in a closed room is –
(a) Methane
(b) Carbon dioxide
(c) Carbon monoxide
(d) Ethane
Option c – Carbon monoxide
The orientation of an atomic orbital is governed by –
(a) Spin quantum number
(b) Magnetic quantum number
(c) Principal quantum number
(d) Azimuthal quantum number
Option b – Magnetic quantum number
Which of the following metals is used in spacecraft to withstand high temperatures?
(a) Titanium (Ti)
(b) Iron (Fe)
(c) Lead (Pb)
(d) Nickel (Ni)
Option a – Titanium (Ti)
Synthetic detergents are made from –
(a) Sodium palmitate
(b) Sodium stearate
(c) Sodium salt of benzene sulphonic acid
(d) Sodium salt of benzene carboxylic acid
Hard water and soft water can be distinguished by using –
(a) Liquid soap
(b) Ordinary soap
(c) Detergent
(d) Dilute acid
Option c – Detergent
Heating of an ore below its melting point in the absence of air is known as –
(a) Calcination
(b) Roasting
(c) Smelting
(d) Refining
Option a – Calcination
The degree of dissociation of an electrolyte depends on –
(a) Atmospheric pressure
(b) Method of dissolution
(c) Impurities
(d) Dilution
Option d – Dilution
Which one of the following is a microelement?
(a) Nitrogen
(b) Hydrogen
(c) Oxygen
(d) Chlorine
Option d – Chlorine
Which metal does not undergo corrosion due to the formation of an oxide layer?
(a) Zinc
(b) Iron
(c) Copper
(d) Aluminium
Option d – Aluminium
Which of the inert gases can form compounds?
(a) Argon
(b) Xenon
(c) Helium
(d) Krypton
Option b – Xenon
The most electronegative element among the following is –
(a) Sodium
(b) Oxygen
(c) Fluorine
(d) Chlorine
Option c – Fluorine
The major constituent of Gobar gas is –
(a) Butane
(b) Carbon dioxide
(c) Methane
(d) Isobutane
Option c – Methane
The major harmful gas emitted by automobile vehicles which causes air pollution is –
(a) Ozone gas
(b) Carbon monoxide
(c) Methane
(d) Carbon dioxide
Option d – Carbon dioxide
Bhopal gas tragedy is associated with the leakage of –
(a) Nitrogen dioxide
(b) Sulfur dioxide
(c) Methyl isocyanate
(d) Carbon dioxide
Option c – Methyl isocyanate
The fuel used in modern submarines is –
(a) Coal
(b) Diesel
(c) Petrol
(d) Nuclear fuel
Option d – Nuclear fuel
Soap is prepared by boiling caustic soda with –
(a) Fats
(b) Alcohol
(c) Glycerine
(d) Kerosene oil
Option a – Fats
The sour taste of ‘Coca Cola’ is due to the presence of –
(a) Formic acid
(b) Acetic acid
(c) Hydrochloric acid
(d) Phosphoric acid
Option d – Phosphoric acid
Petroleum consists of a mixture of –
(a) Carbides
(b) Carbonates
(c) Hydrocarbons
(d) Carbohydrates
Option c – Hydrocarbons
Commercially, sodium bicarbonate is known as –
(a) Baking soda
(b) Washing soda
(c) Soda ash
(d) Bleaching powder
Option a – Baking soda
The important ore of aluminium is –
(a) Bauxite
(b) Haematite
(c) Fluorspar
(d) Cryolite
Option a – Bauxite
In nuclear reactors, graphite is used as a –
(a) Fuel
(b) Moderator
(c) Insulator
(d) Lubricant
Option b – Moderator
Which one of the following gases has the highest calorific value?
(a) Water gas
(b) Natural gas
(c) Coal gas
(d) Indane gas
Option d – Indane gas
Which of the following chemicals is used in photography?
(a) Sodium chloride
(b) Silver bromide
(c) Potassium nitrate
(d) Aluminium hydroxide
Option b – Silver bromide
The ‘Atomic Theory’ of matter was given by –
(a) Newton
(b) Dalton
(c) Pascal
(d) Avogadro
Option b – Dalton
Which one of the following does not contain silver?
(a) German silver
(b) Ruby silver
(c) Horn silver
(d) Lunar caustic
Option a – German silver
Which one of the following elements is an example of a noble gas?
(a) Helium
(b) Nitrogen
(c) Hydrogen
(d) Chlorine
Option a – Helium
An electric iron has a heating element made of –
(a) Nichrome
(b) Zinc
(c) Copper
(d) Tungsten
Option a – Nichrome
The chemical substance present in bones and teeth is –
(a) Calcium borate
(b) Calcium chloride
(c) Calcium sulphate
(d) Calcium phosphate
Option d – Calcium phosphate
Which of the following is not a fertilizer?
(a) Calcium sulphate
(b) Potassium nitrate
(c) Ammonium sulphate
(d) Calcium ammonium nitrate
Option a – Calcium sulphate
Electric bulbs are filled with –
(a) Argon
(b) Oxygen
(c) Nitrogen
(d) Carbon dioxide
Option a – Argon
The element used for vulcanizing rubber is –
(a) Silicon
(b) Bromine
(c) Sulphur
(d) Phosphorus
Option c – Sulphur
Which of the following is not a nucleon?
(a) Electron
(b) Proton
(c) Neutron
(d) Positron
Option d – Positron
The tip of a matchstick contains –
(a) Red phosphorus
(b) Phosphorus trichloride
(c) White phosphorus
(d) Phosphorus pentoxide
Option a – Red phosphorus
The most abundant element in the human body is –
(a) Iron
(b) Nitrogen
(c) Carbon
(d) Oxygen
Option d – Oxygen
Acid rain destroys vegetation because it contains –
(a) Ozone
(b) Carbon monoxide
(c) Nitric acid
(d) Sulphuric acid
Option d – Sulphuric acid
Which is the purest form of iron?
(a) Cast iron
(b) Wrought iron
(c) Steel
(d) Pig iron
Option b – Wrought iron
By which organic compound are all oils known?
(a) Ester
(b) Protein
(c) Hydrocarbon
(d) Carbohydrate
Option c – Hydrocarbon
The acid used in lead storage cells is –
(a) Nitric acid
(b) Phosphoric acid
(c) Sulphuric acid
(d) Hydrochloric acid
Option c – Sulphuric acid
Which among the following is a carbohydrate?
(a) Hydrogen peroxide
(b) Cane-sugar
(c) Nylon
(d) Turpentine
Option b – Cane-sugar
Which of the following elements is non-radioactive?
(a) Plutonium
(b) Uranium
(c) Thorium
(d) Zirconium
Option d – Zirconium
Milk is a natural –
(a) Solution
(b) Mixture
(c) Emulsion
(d) Suspension
Option c – Emulsion
The gas used for filling weather balloons is –
(a) Air
(b) Nitrogen
(c) Hydrogen
(d) Helium
Option d – Helium
Stainless steel is usually made by alloying the steel with –
(a) Chromium and Nickel
(b) Copper and Nickel
(c) Manganese and Copper
(d) Copper and Chromium
Option a – Chromium and Nickel
Hardest allotrope of carbon is –
(a) Coke
(b) Graphite
(c) Diamond
(d) Lamp black
Option c – Diamond
Muscle fatigue is caused by the accumulation of –
(a) Lactic acid
(b) Pyruvic acid
(c) Uric acid
(d) Oxaloacetic acid
Option a – Lactic acid
Which of the following is chiefly present in LPG?
(a) Ethane
(b) Butane
(c) Methane
(d) Propane
Option c – Methane
The most suitable vessel for storing concentrated sulphuric acid is –
(a) Glass vessel
(b) Copper vessel
(c) Earthen vessel
(d) Aluminium vessel
Option a – Glass vessel
Which of the following alkali metals has the highest specific heat?
(a) Lithium
(b) Potassium
(c) Rubidium
(d) Caesium
Option a – Lithium
The substance most commonly used as a food preservative is –
(a) Tartaric acid
(b) Sodium carbonate
(c) Acetic acid
(d) Sodium salt of benzoic acid
Option d – Sodium salt of benzoic acid
The most abundant inert gas in the atmosphere is –
(a) Neon
(b) Argon
(c) Krypton
(d) Helium
Option b – Argon
The fuel used in an atomic reactor is –
(a) Uranium
(b) Coal
(c) Petrol
(d) Combustible gases
Option a – Uranium
The process of removing calcium and magnesium from hard water is known as –
(a) Flocculation
(b) Filtration
(c) Sedimentation
(d) Water softening
Option d – Water softening
In India, the National Laboratory of Chemistry is located in –
(a) Bangalore
(b) Pune
(c) Mumbai
(d) Hyderabad
Option b – Pune
The material used in the manufacture of lead pencils is –
(a) Lead
(b) Mica
(c) Carbon
(d) Graphite
Option d – Graphite
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