Focus Guide for 11th Chemistry Volume 2 PDF Free Download

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Focus Guide for 11th Chemistry Volume 2 PDF Free Download for Students

Bleaching powder used in fish ponds mainly acts as

a) Disinfectant

b) Sterilant

c) Snail controller

d) Parasiticide

Option a – Disinfectant

LNG stands for

a) Liquid Nitrogen Gas

b) Liquefied Nitrogen Gas

c) Liquid Neon Gas

d) Liquefied Natural Gas

Option d – Liquefied Natural Gas

Which of the following Polymers is not a thermoplastic?

a) Teflon

b) Neoprene

c) Polystyrene

d) Polythene

Option b – Neoprene

Fuse wires used in electric instruments are made of

a) Pure zinc

b) Pure lead

c) Alloy of lead and tin

d) Alloy of lead and zinc

Option c – Alloy of lead and tin

Acid rain is caused due to an increase in atmospheric concentration of

a) Ozone and dust

b) Sulphur oxides and nitrogen oxides

c) Carbon monoxide

d) CFCs

Option b – Sulphur oxides and nitrogen oxides

Which of the following statements is not correct for detergents?

a) They have properties similar to soaps

b) They can be used in soft and hard water

c) They cannot be used in acidic medium

d) They are generally obtained from vegetable oils

Option c – They cannot be used in acidic medium

Batteries commonly used in mobile and smartphones are

a) Dry cell

b) Mercury cell

c) Lithium-ion battery

d) Lead storage battery

Option c – Lithium-ion battery

Which substance may be added to fuel to make it oxygenated?

a) Lead

b) Methyl tertiary butyl Ether

c) Organic magnesium

d) Benzene

Option b – Methyl tertiary butyl Ether

With reference to eutrophication, which statements are correct?. 1. It reduces the dissolved oxygen content of water 2. It is caused by nutrient enrichment of a water body

a) Only 1

b) Only 2

c) Both 1 and 2

d) Neither 1 nor 2

Option c – Both 1 and 2

One carbon credit is considered equivalent to

a) 100 kg of carbon

b) 100 kg of carbon dioxide

c) 1000 kg of carbon

d) 1000 kg of carbon dioxide

Option d – 1000 kg of carbon dioxide

The paste of a white material used to fix fractured bones is made of

a) Bleaching powder

b) Plaster of Paris

c) Zinc oxide powder

d) Lime powder

Option b – Plaster of Paris

Which type of glass is used in making optical instruments?

a) Pyrex glass

b) Soft glass

c) Hard glass

d) Flint glass

Option d – Flint glass

The total greenhouse gases produced directly and indirectly by human activities is called

a) Carbon dioxide index

b) Carbon footprint

c) Carbon sequestration

d) Carbon capture

Option b – Carbon footprint

The correct order of contribution of greenhouse gases to global warming is

a) CO₂ > CFCs > CH₄ > N₂O

b) CO₂ > CH₄ > CFCs > N₂O

c) CO₂ > CH₄ > N₂O > CFCs

d) CO₂ > N₂O > CH₄ > CFCs

Option c – CO₂ > CH₄ > N₂O > CFCs

Calcium carbide is used for artificial ripening of fruits because it releases

a) Acetylene

b) Methylene

c) Florigen

d) Auxin

Option a – Acetylene

Which element is used as a time standard in atomic clocks?

a) Potassium

b) Caesium

c) Calcium

d) Magnesium

Option b – Caesium

An electron and a proton accelerated through the same potential difference will have

a) Different kinetic energies

b) Electron moving faster than proton

c) Proton moving faster than electron

d) Equal speeds

Option b – Electron moving faster than proton

The principal use of hydrofluoric Acid is

a) Etching glass

b) Acting as a bleaching agent

c) Acting as a strong oxidising agent

d) Preparing Organic fluorine compounds

Option a – Etching glass

The statement that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules is known as

a) Avogadro’s hypothesis

b) Gay-Lussac’s hypothesis

c) Planck’s hypothesis

d) Kirchhoff’s theory

Option a – Avogadro’s hypothesis

The density of water is maximum at

a) 0°C

b) –4°C

c) 4°C

d) 10°C

Option c – 4°C

The phosphorus used in the manufacture of safety matches is

a) Red phosphorus

b) Black phosphorus

c) White phosphorus

d) Scarlet phosphorus

Option a – Red phosphorus

Which of the following is not a chemical change?

a) Ripening of fruits

b) Curdling of milk

c) Freezing of water

d) Digestion of Food

Option c – Freezing of water

Baking soda is chemically known as

a) Sodium hydrogen carbonate

b) Sodium dihydrogen carbonate

c) Disodium hydrogen carbonate

d) Sodium carbonate

Option a – Sodium hydrogen carbonate

Which of the following represents a reduction reaction?

a) 2Mg + O₂ → 2MgO

b) S + O₂ → SO₂

c) 2HgO → 2Hg + O₂

d) Mg + S → MgS

Option c – 2HgO → 2Hg + O₂

Which of the following is not a greenhouse gas?

a) Methane

b) CFC

c) Sulphur dioxide

d) Nitrous oxide

Option c – Sulphur dioxide

Which gas is known as a noble gas?

a) Hydrogen

b) Oxygen

c) Helium

d) Carbon dioxide

Option c – Helium

Vinegar is chemically known as

a) Acetic Acid

b) Butyric Acid

c) Formic Acid

d) Tartaric Acid

Option a – Acetic Acid

Which of the following is not a fossil fuel?

a) Coal

b) Petroleum

c) Natural gas

d) Uranium

Option d – Uranium

The liquid commonly used in a simple barometer is

a) Water

b) Mercury

c) Alcohol

d) All of the above

Option b – Mercury

Which of the following carbon-based substances burns without producing a sooty flame?

a) Benzene

b) Hexane

c) Naphthalene

d) Anthracene

Option b – Hexane

What is the molar Mass of anhydrous sodium carbonate?

a) 286 u

b) 106 u

c) 83 u

d) 53 u

Option c – 83 u

Which of the following Metals does not liberate hydrogen gas when treated with dilute hydrochloric Acid?

a) Mercury

b) Aluminium

c) Magnesium

d) Iron

Option a – Mercury

Which one of the following represents a non-uniform mixture?

a) Hydrochloric Acid

b) Vinegar

c) Milk

d) Soda water

Option c – Milk

Oxygen occurs as two isotopes of Mass 16 u and 18 u in the ratio 3 : 1. What is the mean atomic Mass of oxygen in this mixture?

a) 17.5 u

b) 17 u

c) 16 u

d) 16.5 u

Option d – 16.5 u

An element with atomic number 8 combines with sodium. How many electrons does it gain in the process?

a) One

b) Two

c) Three

d) Four

Option b – Two

Soaps are sodium or potassium Salts of

a) Stearic Acid

b) Oleic acid

c) Palmitic acid

d) All of these

Option d – All of these

Which of the following represents the chemical formula of baking soda?

a) CaCO₃

b) Ca(OH)₂

c) Na₂CO₃

d) NaHCO₃

Option d – NaHCO₃

Calcium and argon have different atomic numbers but the same Mass number (40). Such elements are called

a) Isotones

b) Isochores

c) Isobars

d) Isotopes

Option c – Isobars

How many atoms are present in 46 g of sodium-23?

a) N⁄2

b) N

c) 2N

d) 23N

Option c – 2N

The atomic model popularly known as the “plum pudding model” was proposed by

a) Antoine Lavoisier

b) Robert Boyle

c) Ernest Rutherford

d) J. J. Thomson

Option d – J. J. Thomson

Which of the following changes is purely physical in nature?

a) Burning of coal

b) Burning of wood

c) Heating a platinum crucible

d) Heating potassium chlorate

Option c – Heating a platinum crucible

The pH value of pure distilled water is

a) Zero

b) 14

c) Very close to zero

d) Nearly seven

Option d – Nearly seven

A carbon Atom has 6 protons and a Mass number of 12. How many neutrons are present in it?

a) 12

b) 6

c) 10

d) 14

Option b – 6

Which property most distinctly defines an element?

a) Density

b) Boiling point

c) Mass number

d) Atomic number

Option d – Atomic number

Which of the following Polymers is not composed of glucose units?

a) Glycogen

b) Starch

c) Cellulose

d) Rubber

Option d – Rubber

In reverse osmosis used for desalinating seawater, the applied pressure is

a) Greater than the osmotic pressure

b) Lower than the osmotic pressure

c) Equal to the osmotic pressure

d) Equal to atmospheric pressure

Option a – Greater than the osmotic pressure

Which statement related to thermal expansion is incorrect?

a) Ice expands uniformly on melting up to 4°C

b) Mercury thermometers operate on thermal expansion

c) Gaps are provided between Railway tracks to allow expansion

d) A metal wire lengthens when heated

Option a – Ice expands uniformly on melting up to 4°C

Tincture of iodine is a dilute iodine solution that does not contain

a) Water

b) Acetone

c) Alcohol

d) Potassium iodide

Option b – Acetone

Which metal is commonly used to coat brass utensils to avoid copper contamination?

a) Tin

b) Zinc

c) Aluminium

d) Lead

Option a – Tin

The molar Mass of sulphuric acid is 98. If 49 g is dissolved to prepare one litre of solution, its normality is

a) Two normal

b) One normal

c) 0.5 normal

d) Four normal

Option b – One normal

At normal temperature and pressure, which sample contains a different number of molecules?

a) 3 g of hydrogen

b) 48 g of oxygen

c) 42 g of nitrogen

d) 2 g of carbon

Option d – 2 g of carbon

When one volume of nitrogen reacts with three volumes of hydrogen, the volume of ammonia formed is

a) One volume

b) Two volumes

c) Three volumes

d) One and a half volumes

Option b – Two volumes

Which of the following elements exhibits zero valency?

a) Sulphur

b) Phosphorus

c) Lead

d) Radon

Option d – Radon

Which chlorine oxy-ion does not show disproportionation reactions?

a) ClO⁻

b) ClO₂⁻

c) ClO₃⁻

d) ClO₄⁻

Option d – ClO₄⁻

Which statement about Chemical Bonding is correct?

a) Covalent bonds are directional

b) Ionic bonds are directional

c) Both ionic and covalent bonds are directional

d) Both ionic and covalent bonds are non-directional

Option a – Covalent bonds are directional

When a safety match is struck, the initial process is

a) Combustion of sulphur

b) Breakdown of potassium chlorate releasing oxygen

c) Conversion of a small quantity of red phosphorus into white phosphorus

d) Burning of glue and starch

Option c – Conversion of a small quantity of red phosphorus into white phosphorus

A sulphur-containing compound is added to LPG mainly because ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

a) It lowers manufacturing cost

b) It improves fuel efficiency

c) It helps in quick detection of gas leakage

d) It aids in liquefaction of the gas

Option c – It helps in quick detection of gas leakage

Which gas forms an acidic solution when dissolved in water? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

a) Hydrogen

b) Carbon dioxide

c) Nitrogen

d) Oxygen

Option b – Carbon dioxide

Joule–Thomson cooling is commonly employed to obtain extremely low temperatures at low cost. This method is categorized as which type of thermodynamic process? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Constant-pressure process

(B) Constant-enthalpy process

(D) Constant-volume process

Option b – Constant-enthalpy process

A mixture containing sand and naphthalene can be separated effectively by which technique? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Sublimation

(B) Simple distillation

(D) Fractional distillation

Option a – Sublimation

Which SET of elements makes up the chemical composition of urea? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Carbon, hydrogen, oxygen

(B) Carbon, nitrogen, oxygen

(D) Carbon, hydrogen, nitrogen, oxygen

Option d – Carbon, hydrogen, nitrogen, oxygen

In a breath analyzer test for detecting Alcohol consumption, the filter paper is treated with which chemicals? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Potassium dichromate and sulphuric acid

(B) Potassium permanganate and sulphuric acid

(D) Turmeric powder

Option a – Potassium dichromate and sulphuric acid

How many sigma bonds and pi bonds are present in a benzene Molecule? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) 3 sigma and 3 pi

(B) 3 sigma and 6 pi

(D) 12 sigma and 6 pi

Option c – 12 sigma and 3 pi

Which method is most widely used by municipal bodies to disinfect drinking water? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Chlorine treatment

(B) Bromine treatment

(D) Ultraviolet exposure

Option a – Chlorine treatment

The activated sludge process for sewage treatment mainly relies on which factor? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Elevated temperature

(B) Acid treatment

(D) Moist conditions

Option c – Microbial activity

Temporary hardness in water is mainly due to the presence of which compounds? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Oxides

(B) Bicarbonates

(D) Sulphates

Option b – Bicarbonates

What happens to a nucleus during the emission of gamma radiation? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Only the atomic number changes

(B) Only the neutron number changes

(D) Both proton and neutron numbers change

Option c – Neither proton nor neutron number changes

Which Food source is the richest in alpha-linolenic acid, an important omega-3 fatty acid? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Mung bean

(B) Moth bean

(D) Oats

Option c – Flaxseed

In beta decay, the negatively charged particles released are best described as ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Electrons originally present inside the nucleus

(B) Electrons produced when a neutron transforms inside the nucleus

(D) None of the above

Option b – Electrons produced when a neutron transforms inside the nucleus

Compared to a Molecule inside a liquid, the potential energy of a Molecule at the liquid surface is ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Zero

(B) Lower

(D) Higher

Option d – Higher

When silicon dioxide reacts with sodium carbonate, which gas is liberated? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Carbon dioxide

(B) Carbon monoxide

(D) Ozone

Option a – Carbon dioxide

What is the oxidation number of oxygen in OF₂? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) −1

(B) +1

(D) −2

Option c – +2

Which unit is used to measure radioactivity? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Co

(B) Ci

(D) Cq

Option b – Ci

Which chemical compound is responsible for the intoxicating effect in alcoholic drinks? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Ethanol

(B) Methanol

(D) Glycerol

Option a – Ethanol

Which of the following compounds does not involve a coordinate (dative) bond? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) SO₂

(B) HNO₂

(D) H₂SO₄

Option d – H₂SO₄

Which compound belongs to the same homologous series as ethyne? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) C₂H₂

(B) C₂H₆

(D) C₃H₆

Option c – C₂H₄

What is the general Molecular formula of disaccharides? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) C₁₀H₂₀O₁₀

(B) C₁₂H₂₂O₁₁

(D) C₆H₁₂O₆

Option b – C₁₂H₂₂O₁₁

In plaster of Paris, how many water molecules are associated with two formula units of calcium sulphate? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) One

(B) Two

(D) Ten

Option a – One

Which statement is incorrect with respect to graphite? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Each carbon Atom is sp hybridised

(B) Each carbon Atom is sp² hybridised

(D) Each layer forms hexagonal rings

Option a – Each carbon Atom is sp hybridised

Carbon black is manufactured by which process? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Heating wood strongly without air

(B) Heating coal strongly without air

(D) Heating coal strongly in the presence of air

Option c – Incomplete combustion of Hydrocarbons

Which statement about molecularity of a reaction is incorrect? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) It may have a fractional value

(B) It is obtained from the reaction mechanism

(D) It equals the order for an elementary reaction

Option a – It may have a fractional value

In nuclear reactors, heavy water is mainly used to ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Cool the reactor system

(B) Terminate the nuclear reaction

(D) Increase neutron velocity

Option c – Reduce the speed of fast neutrons

Which of the following represents the purest allotrope of carbon? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Charcoal

(B) Coke

(D) Carbon black

Option d – Carbon black

Carbon monoxide is highly poisonous primarily because of its ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Poor solubility in water

(B) Strong affinity for haemoglobin

(D) Presence of sigma Bonding

Option b – Strong affinity for haemoglobin

Which alkali metal has the lowest melting temperature? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Sodium

(B) Potassium

(D) Caesium

Option d – Caesium

During alpha or beta decay of a radioactive nucleus, which of the following outcomes is not possible? ( Focus Guide for 11th Chemistry Volume 2 PDF Free Download )

(A) Formation of an isobar

(B) Formation of an isotope

(D) Formation of a nucleus with a lower atomic number

Option b – Formation of an isotope

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