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Focus Guide for 11th Chemistry PDF for Students
What is the chief component present in natural gas?
(A) Methane
(B) Ethane
(C) Propane
(D) Benzene
Option a – Methane
Gasohol refers to
(A) A blend of ethyl Alcohol and petrol
(B) A mixture of natural gas and ethyl Alcohol
(C) Any gaseous fuel dissolved in Alcohol
(D) Ethyl Alcohol mixed with kerosene oil
Option a – A blend of ethyl Alcohol and petrol
Gasohol is formed by combining
(A) Gasoline with methanol
(B) Gasoline with ethanol
(C) Gasoline with propanol
(D) Methanol and ethanol
Option b – Gasoline with ethanol
Which compound is added to petrol to reduce engine knocking?
(A) Ethyl Alcohol
(B) Butane
(C) Tetraethyl lead
(D) White petrol
Option c – Tetraethyl lead
Tetraethyl lead is mixed with petrol to
(A) Prevent solidification at low temperature
(B) Raise the flash point
(C) Improve the anti-knock quality
(D) Increase the boiling temperature
Option c – Improve the anti-knock quality
Which chemical acts as an antifreeze in automobile engines?
(A) Propyl Alcohol
(B) Ethanol
(C) Methanol
(D) Ethylene glycol
Option d – Ethylene glycol
Diesel engines are widely used in heavy vehicles mainly because of
(A) Better mileage and engine safety
(B) Lower operational cost and fuel Economy
(C) High output power with economic advantage
(D) Lower cost compared to petrol
Option c – High output power with economic advantage
Hydrogen can be used as a vehicle fuel when stored at low temperature and released using exhaust Heat. Which material available in India enables this process?
(A) Hydride
(B) Coal
(C) Soapstone
(D) Resins
Option a – Hydride
Assertion: Methane is the principal constituent of liquefied petroleum gas. Reason: Methane is supplied through pipelines for direct domestic and industrial use.
(A) Both the assertion and reason are correct, and the reason explains the assertion
(B) Both the assertion and reason are correct, but the reason does not explain the assertion
(C) The assertion is correct, but the reason is incorrect
(D) The assertion is incorrect, but the reason is correct
Option d – The assertion is incorrect, but the reason is correct
Examine the following statements related to natural gas. 1. Liquefied natural gas is obtained by cooling natural gas to extremely low temperatures under high pressure for storage and Transport. 2. The first LNG terminal in India was established at Hassan. 3. Natural gas liquids are separated from LPG and include ethane, propane, butane and natural gasoline. Which of the above statements is/are correct?
(A) Only the first statement
(B) First and third statements only
(C) Second and third statements only
(D) All three statements
Option a – Only the first statement
Consider the following statements. 1. Coal, petroleum and natural gas belong to the category of fossil fuels. 2. Gasohol consists of benzene mixed with Alcohol. 3. Geothermal energy is classified as a non-conventional energy source. 4. Gobar gas mainly contains methane. Which of the statements given above are correct?
(A) First and second only
(B) Second and third only
(C) First, second and third only
(D) First, third and fourth only
Option d – First, third and fourth only
Which of the following features contribute to improved fuel efficiency in modern cars?. 1. Radial tyres 2. Streamlined vehicle design 3. Multipoint fuel injection 4. Catalytic converter in exhaust system
(A) Only radial tyres and streamlined design
(B) Only streamlined design and multipoint fuel injection
(C) Streamlined design, multipoint fuel injection and catalytic converter
(D) Radial tyres, multipoint fuel injection and catalytic converter
Option d – Radial tyres, multipoint fuel injection and catalytic converter
Which substance is commonly used to preserve Food?
(A) Sodium carbonate
(B) Acetylene
(C) Benzoic Acid
(D) Sodium chloride
Option c – Benzoic Acid
Refrigeration preserves Food primarily by
(A) Destroying harmful microorganisms
(B) Slowing down biochemical reactions
(C) Inactivating enzymes permanently
(D) Forming a protective ice layer
Option b – Slowing down biochemical reactions
Which of the following is widely used as a Food preservative?
(A) Citric Acid
(B) Potassium chloride
(C) Sodium benzoate
(D) Sodium chloride
Option c – Sodium benzoate
Which chemical is added to preserve fruit juices?
(A) Acetic Acid
(B) Formic Acid
(C) Sulphuric Acid
(D) Sodium benzoate
Option d – Sodium benzoate
Which refrigerant is most commonly used in household refrigerators?
(A) Neon
(B) Oxygen
(C) Freon
(D) None of these
Option c – Freon
Which type of charcoal is used for removing colour from raw sugar?
(A) Wood charcoal
(B) Sugar charcoal
(C) Animal charcoal
(D) Coconut charcoal
Option c – Animal charcoal
Which fertilizer tends to make the soil most acidic?
(A) Urea
(B) Ammonium sulphate
(C) Ammonium nitrate
(D) Calcium ammonium nitrate
Option b – Ammonium sulphate
How much nitrogen is contained in urea by percentage?
(A) 30%
(B) 25%
(C) 47%
(D) 60%
Option c – 47%
For optimal wheat production, which nutrient is primarily required?
(A) Nitrogen
(B) Potassium
(C) Copper
(D) Iron
Option a – Nitrogen
Which of the following elements is generally not included in fertilizers?
(A) Nitrogen
(B) Hydrogen
(C) Chlorine
(D) Phosphorus
Option b – Hydrogen
Nitrogen present in urea exists mainly in which chemical form?
(A) Amide
(B) Ammoniacal
(C) Nitrate
(D) Nitrite
Option a – Amide
Plants mainly take up nitrogen from the soil in the form of
(A) Nitric oxide
(B) Nitrate
(C) Ammonia
(D) Nitride
Option b – Nitrate
Which compound is consumed during the industrial production of urea?
(A) Carbon dioxide
(B) Sulphur dioxide
(C) Chlorine
(D) Nitric Acid
Option a – Carbon dioxide
What is the main reason for encouraging the use of neem-coated urea?
(A) It boosts nitrogen fixation by microorganisms
(B) It delays the breakdown of urea in the soil
(C) It completely stops greenhouse gas emissions
(D) It works as both fertilizer and weed killer
Option b – It delays the breakdown of urea in the soil
What is the nutrient composition of DAP fertilizer?
(A) 10% nitrogen and 20% phosphorus
(B) 18% nitrogen and 46% phosphorus
(C) 30% nitrogen and 46% phosphorus
(D) 35% nitrogen and 70% phosphorus
Option b – 18% nitrogen and 46% phosphorus
Which of the following belongs to the category of mixed fertilizers?
(A) Urea
(B) Calcium ammonium nitrate
(C) Ammonium sulphate
(D) NPK
Option c – Ammonium sulphate
Which option below is not considered a chemical fertilizer?
(A) Urea
(B) Sodium sulphate
(C) Super phosphate
(D) Potassium nitrate
Option b – Sodium sulphate
Which fertilizer is most widely used for foliar spraying?
(A) Sodium nitrate
(B) Urea
(C) DAP
(D) Potassium chloride
Option b – Urea
Humus in soil is best classified as
(A) A soil structure component
(B) Crystalloids
(C) Organic colloids
(D) None of these
Option c – Organic colloids
Which crop is most suitable for green manuring practices?
(A) Potato
(B) Sugarcane
(C) Sunhemp
(D) Gram
Option c – Sunhemp
Assertion: Chemical fertilizers are needed to fulfill the phosphorus demand of crops. Reason: Organic manure supplies only about 2–3 kg of phosphorus per metric tonne.
(A) Both statements are true and the reason explains the assertion
(B) Both statements are true, but the reason does not explain the assertion
(C) The assertion is true, but the reason is false
(D) The assertion is false, but the reason is true
Option a – Both statements are true and the reason explains the assertion
What outcomes may result from excessive or improper use of nitrogen-based fertilizers?. 1. Increase in nitrogen-fixing microbes 2. Higher soil acidity 3. Nitrate seepage into groundwater
(A) Only 1 and 3
(B) Only 2
(C) Only 2 and 3
(D) 1, 2 and 3
Option c – Only 2 and 3
Which gas is most commonly used in fire extinguishers?
(A) Carbon dioxide
(B) Hydrogen
(C) Oxygen
(D) Sulphur dioxide
Option a – Carbon dioxide
In a typical fire extinguisher, carbon dioxide is generated by reacting
(A) Limestone with dilute sulphuric Acid
(B) Marble with dilute hydrochloric Acid
(C) Sodium bicarbonate with dilute sulphuric Acid
(D) Magnesite with dilute hydrochloric acid
Option c – Sodium bicarbonate with dilute sulphuric acid
Which of the following scientist–discovery pairs is incorrect?
(A) Meson – Hideki Yukawa
(B) Positron – C. D. Anderson and U. F. Hess
(C) energy production in stars – H. A. Bethe
(D) Transuranic elements – Enrico Fermi
Option d – Transuranic elements – Enrico Fermi
Which substance acts as an effective mosquito-killing agent?
(A) Allethrins
(B) Atropine
(C) Isopropoxyphenyl
(D) Benzene hexachloride
Option a – Allethrins
Which compound is used in the production of fire-resistant clothing? ( Focus Guide for 11th Chemistry PDF )
(A) Sodium sulphate
(B) Magnesium sulphate
(C) Ferrous sulphate
(D) Aluminium sulphate
Option d – Aluminium sulphate
Which of the following substances is commonly used as a mosquito repellent? ( Focus Guide for 11th Chemistry PDF )
(A) Pyrethrum
(B) Rotenone
(C) Ephedrine
(D) None of these
Option a – Pyrethrum
Pyrethrin used in mosquito coils is derived from ( Focus Guide for 11th Chemistry PDF )
(A) A flowering plant
(B) An insect
(C) A bacterium
(D) A fungus
Option a – A flowering plant
Which chemical is used in the preparation of rat poison? ( Focus Guide for 11th Chemistry PDF )
(A) Ethyl Alcohol
(B) Methyl isocyanate
(C) Potassium cyanide
(D) Ethyl isocyanide
Option c – Potassium cyanide
Which of the following substances is widely used as rat poison? ( Focus Guide for 11th Chemistry PDF )
(A) Zinc sulphide
(B) Lead sulphide
(C) Calcium phosphate
(D) Zinc phosphide
Option d – Zinc phosphide
Which option represents a factor associated with soil characteristics? ( Focus Guide for 11th Chemistry PDF )
(A) Edaphic
(B) Climatic
(C) Biotic
(D) Topographical
Option a – Edaphic
The large-scale industrial use of liquefied oxygen or hydrogen is referred to as ( Focus Guide for 11th Chemistry PDF )
(A) Pyrotechnology
(B) Pyrometry
(C) Hydroponic technique
(D) Cryogenic Technology
Option d – Cryogenic Technology
For military concealment, smoke screens are generally formed using fine particles of ( Focus Guide for 11th Chemistry PDF )
(A) Sodium chloride suspended in air
(B) Silver iodide dispersed in the Atmosphere
(C) Titanium oxide particles in air
(D) Magnesium oxide particles in air
Option c – Titanium oxide particles in air
Identify the statement that is factually incorrect ( Focus Guide for 11th Chemistry PDF )
(A) Charles Darwin introduced the theory of Evolution
(B) Splitting an atomic nucleus is termed nuclear fusion
(C) Dry ice is the Solid form of carbon dioxide
(D) Graham Bell invented the telephone
Option b – Splitting an atomic nucleus is termed nuclear fusion
Which of the following chemicals function as electrolytes in a dry cell? ( Focus Guide for 11th Chemistry PDF )
(A) Ammonium chloride and zinc chloride
(B) Sodium chloride and calcium chloride
(C) Magnesium chloride and zinc chloride
(D) Ammonium chloride and calcium chloride
Option a – Ammonium chloride and zinc chloride
The electrolyte commonly present in a standard dry cell is ( Focus Guide for 11th Chemistry PDF )
(A) Zinc
(B) Sulphuric acid
(C) Ammonium chloride
(D) Manganese dioxide
Option c – Ammonium chloride
The energy stored within a dry cell is in the form of ( Focus Guide for 11th Chemistry PDF )
(A) Mechanical energy
(B) Electrical energy
(C) Chemical energy
(D) Electromagnetic energy
Option c – Chemical energy
Which solution acts as the electrolyte in an automobile battery? ( Focus Guide for 11th Chemistry PDF )
(A) Sodium sulphate
(B) Nitric acid
(C) Sulphuric acid
(D) Potassium nitrate
Option c – Sulphuric acid
Rechargeable batteries used in devices such as torches and electric shavers commonly use which electrode pair? ( Focus Guide for 11th Chemistry PDF )
(A) Nickel and cadmium
(B) Zinc and carbon
(C) Lead and lead peroxide
(D) Iron and cadmium
Option a – Nickel and cadmium
Which of the following combinations is correctly matched? ( Focus Guide for 11th Chemistry PDF )
(A) Sulphur dioxide – Dental damage
(B) Fluoride Pollution – Bhopal gas Disaster
(C) Methyl isocyanate – Acid rain
(D) Ozone depletion – Skin cancer
Option d – Ozone depletion – Skin cancer
The industrial Disaster known as the Bhopal Gas Tragedy was caused by the release of ( Focus Guide for 11th Chemistry PDF )
(A) Methyl isocyanate
(B) Nitrogen dioxide
(C) Sulphur dioxide
(D) Carbon monoxide
Option a – Methyl isocyanate
The year 2011 was observed by the United Nations as the International Year of ( Focus Guide for 11th Chemistry PDF )
(A) Chemistry
(B) Astronomy
(C) Biodiversity
(D) Physics
Option a – Chemistry
The Bhopal Gas Tragedy occurred during ( Focus Guide for 11th Chemistry PDF )
(A) 2–3 December 1984
(B) 2–3 November 1984
(C) 2–3 December 1985
(D) 2–3 November 1985
Option a – 2–3 December 1984
The United Nations Framework Convention on Climate Change primarily focuses on ( Focus Guide for 11th Chemistry PDF )
(A) Decreasing dependence on fossil fuels
(B) Controlling carbon dioxide emissions
(C) Limiting greenhouse gas emissions
(D) More than one of the above
Option d – More than one of the above
Bisphenol A (BPA) is best described as ( Focus Guide for 11th Chemistry PDF )
(A) A diagnostic test for cancer
(B) A screening method for drug abuse in sports
(C) A chemical used in Food-packaging products
(D) A specialized alloy metal
Option c – A chemical used in Food-packaging products
Ethanol blending with petrol has been made compulsory in which country? ( Focus Guide for 11th Chemistry PDF )
(A) China
(B) United Kingdom
(C) Switzerland
(D) Brazil
Option d – Brazil
Which of the following is classified as an Inorganic gaseous air pollutant? ( Focus Guide for 11th Chemistry PDF )
(A) Phosgene
(B) Hydrogen cyanide
(C) Hydrogen sulphide
(D) Methane
Option c – Hydrogen sulphide
Arrange the following gases in descending order based on their contribution to global warming ( Focus Guide for 11th Chemistry PDF )
(A) CO₂ > CH₄ > CFCs > N₂O
(B) CO₂ > N₂O > CH₄ > CFCs
(C) CO₂ > CFCs > CH₄ > N₂O
(D) CO₂ > CH₄ > N₂O > CFCs
Option d – CO₂ > CH₄ > N₂O > CFCs
Assertion: Ozone is capable of destroying microorganisms present in water. Reason: Ozone does not possess radioactive properties. ( Focus Guide for 11th Chemistry PDF )
(A) Both statements are true and the reason correctly explains the assertion
(B) Both statements are true, but the reason does not explain the assertion
(C) The assertion is true, but the reason is false
(D) The assertion is false, but the reason is true
Option b – Both statements are true, but the reason does not explain the assertion
Scientists at Brookhaven National Laboratory successfully created the heaviest antimatter nucleus. What could be the outcomes of this development?. 1. Simplification and cost reduction in mineral and oil exploration 2. Supporting the possibility of antimatter-based stars and galaxies 3. Enhancing understanding of the universe’s Evolution ( Focus Guide for 11th Chemistry PDF )
(A) Only 1
(B) Only 2 and 3
(C) Only 3
(D) 1, 2 and 3
Option b – Only 2 and 3
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