NCERT Class 11/MCQ Questions for Class 11 Chemistry sets 3 Sample Test,Sample questions

Question:
0.0833mol of carbohydrate of empirical formula CH2O contain 1 g of hydrogen. The molecular formula of the carbohydrate is

1.C5H10O5

2.C3H4O3

3.C12H22O11

4.C6H12O6


Question:
0.0833mol of carbohydrate of empirical formula CH2O contain 1g of hydrogen. The molecular formula of the carbohydrate is

1.C5H10O5

2.C3H4O3

3.C12H22O11

4.C6H12O6


Question:
2 – Phenylpropene on acidic hydration gives

1.2 – Phenyl – 2 – propanol

2.2 – Phenyl – 1 – propanol

3.3 – Phenyl – 1 – propanol

4.1 – Phenyl – 2 – propanol


Question:
59 g of an amide obtained from a carboxylic acid, RCOOH, liberated 17 g of ammonia upon heating with alkali. The acid is

1.Formic Acid

2.Acetic Acid

3.Benzoic Acid

4.Propionic Acid


Question:
A crystalline solid possess which one of the following property?

1.Irregularity

2.Non- symmetric

3.Perfect geometric pattern

4.non- stability


Question:
A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______.

1.2, 2-dibromobutane

2.1, 1-dibromopropane

3.1, 4-dibromobutane

4.1, 2-dibromoethane


Question:
A disease caused by eating fish contaminated by industrial waste, containing mercury compounds, is called as

1.Minamata disease

2.Brights disease

3.Hashimotos disease

4.Osteosclerosis


Question:
A gas deviates from ideal behavior at a high pressure because its molecules:

1.Attract one another

2.Show the Tyndall Effect

3.Have kinetic energy

4.Are bound by covalent bonds


Question:
Alkyl halides react with dialkyl copper reagents to give?

1.Alkanes

2.Alkenes

3.Hydrogen

4.Carbon


Question:
Ammonia gas can be dried by

1.conc H2SO4

2.P2O5

3.CaCl2

4.Quick lime


Question:
Among the C-X bond (where, X = Cl, Br, l) the correct decreasing order of bond energy is

1.C−I > C−Cl > C−Br

2.C−I > C−Br > C−Cl

3.C−Cl > C−Br > C−I

4.C−Br > C−Cl > C−I


Question:
An organic compound which produces a bluish green coloured flame on heating in presence of copper is

1.Chlorobenzene

2.Benzaldehyde

3.Aniline

4.Benzoic acid


Question:
Falling drop of water is spherical due to:

1.Hydrogen Bonding

2.Surface Tension

3.Capillary Action

4.Vlscosity


Question:
Fluorosis, the bone disease, is caused by the presence of

1.Pesticides in water

2. Fluorides in water

3.Carbon monoxide in air

4.Sulphur dioxide in air


Question:
How many of the know elements exist as gases at 25°C?

1.9

2.11

3.12

4.15


Question:
Hydrocarbon containing following bond is most reactive

1.C ≡ C

2. C = C

3. C-C

4.All of these


Question:
Identify the chiral molecule among the following:

1.Isopropyl alcohol

2.2-pentanol

3.1-bromo 3-butene

4. Isobutyl alcohol


Question:
Identify the wrong statement in the following:

1.Acid rain is mostly because of oxides of nitrogen and sulphur

2.Chlorofluorocarbons are responsible for ozone layer depltion

3. Greenhouse effect is responsible for global warming

4.Ozone layer does not permit infrared radiation from the sun to reach the earth.


Question:
If 0.228 g of silver salt of dibasic acid gave a residue of 0.162 g of silver on ignition then molecular weight of the acid is

1.70

2.80

3.90

4.100


Question:
If 20cm³ gas at 1 atm. is expanded to 50 cm³ at constant T, then what is the final pressure

1.20 × 150

2.50 × 120

3.1 × 120 × 50

4.None of these


Question:
If Cl2 gas is passed in to aqueous solution of Kl containing some CCl4 and the mixture is shaken then:

1.Upper layer becomes violet

2.Lower layer becomes violet

3.Homogenous violet layer is formed

4.None of these


Question:
If there is no rotation of plane polarized light by a compound in a specific solvent, thought to be chiral, it may mean that

1.The compound may be a racemic mixture

2.The compound is certainly a chiral

3. The compound is certainly meso

4.There is no compound in the solvent.


Question:
If two compounds have the same empirical formula but different molecular formula they must have

1.Different percentage composition

2.Different molecular weight

3. Same viscosity

4.Same vapour density


Question:
In general, the Boron Trihaides act as

1. Strong reducing agent

2.Lewis Acids

3.Lewis Bases

4.Dehydrating Agents


Question:
In the compound of type ECl3, where E = B, P, As, or Bi, the angle Cl – E – Cl for different E are ion the order:

1.B > = P = As = Bi

2.B > P > As > Bi

3.B < P = As = Bi

4.B < P < As < Bi


Question:
In the Dumas method, the nitrogen present in organic compound gets converted to

1.Sodium Cyanide

2.Gaseoue Ammonia

3.Dinitrogen Gas

4.Ammonium Sulphate


Question:
In the upper layers of atmosphere ozone is formed:

1. By action of electric discharge on oxygen molecule

2.By action of ultraviolet rays on oxygen molecule

3.By action of infrared rays on oxygen molecule

4.Due to sudden drops of pressure


Question:
In van der Waal equation of state of gas laws, the constant b is a measure of

1.Intermolecular collisions per unit volume

2. Intermolecular attraction

3.Volume occupied by the molecules

4.Intermolecular repulsions


Question:
Inductive effect involves

1.displacement of σ electrons

2.delocalization of π electrons

3. delocalization of σ-electrons

4.displacement of π-electrons


Question:
Inert gases such as helium behave like ideal gases over a wide range of temperature .However; they condense into the solid state at very low temperatures. It indicates that at very low temperature there is a

1. Weak attractive force between the atoms

2.Weak repulsive force b etween the atoms

3.Strong attractive force between the atoms

4. Strong repulsive attractive between the atoms


Question:
Insulin contains 3.4% sulphur. The minimum molecular weight of insulin is

1.350

2.470

3.560

4.940


Question:
K2[Hgl4] detect the ion/group

1.NH2

2. NO

3.NH2+

4.Cl–


Question:
Nitrobenzene on reaction with conc. HNO3/H2SO4 at 80 – 100°C forms which one of the following products?

1.1, 2-Dinitrobenzene

2. 1, 3-Dinitrobenzene

3.1, 4-Dinitrobenzene

4. 1, 2, 4-Trinitrobenzene


Question:
On heating ozone, its volume.

1.Increase to 1.5 times

2.Decreases to half

3.Remain uncharged

4.Becomes double


Question:
One of the following is the chief source of water and soil pollution

1.Agro industry

2.Mining

3.Thermal power stations

4.All of these


Question:
Oxygen gas can be prepared from solid KMnO4 by

1. Dissolving the solid in dil. HCl

2.Dissolving the solid in conc. H2SO4

3.Treating the solid with H2 gases

4.Strongly heating the solid


Question:
Presence of a nitro group in a benzene ring

1.Activates the ring towards electrophilic substitution

2.Renders the ring basic

3.Deactivates the ring towards nucleophilic substitution

4.Deactivates the ring towards electrophilic substitution


Question:
Pure methane can be prepared by

1.Soda lime decarboxylation

2.Kolbes electrolytic method

3.Wurtz reaction

4.Reduction with H2


Question:
Red phosphorus is chemically less reactive because

1.It does not contain P – P bonds

2.It dos not contain tetrahedral P4 molecules

3.It does not catch fire in air even upto 400°C

4. It has a polymeric structure


Question:
Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

1.–C ≡ N

2. -SO3H

3. -COOH

4. -NO2


Question:
Synthesis of ethanal commercially from which of the following reagent is the part of green chemistry?

1. CH3CH2OH

2.CH2 = CH2

3.HC ≡ CH

4.All of these


Question:
The agricultural field that produces maximum methane gas into atmosphere is

1. Wheat field

2.Paddy field

3.Cotton field

4.Groundnut field


Question:
The angle strain in cyclobutane is

1.24°44

2.29°16

3.19°22

4.9°44


Question:
The catalyst used in Friedel – Crafts reaction is

1. Aluminium Chloride

2.Anhydrous Aluminium Chloride

3.Ferric Chloride

4.Copper


Question:
The coal tar fraction which contains phenol is:

1.Heavy Oil

2.Light Oil

3.Middle Oil

4.Green Oil


Question:
The compound C3H4 has a triple bond, which is indicated by its reaction with

1.Bromine water

2.Bayers reagent

3.Fehling solution

4.Ammonical silver nitrate


Question:
The compound MCQ Questions for Class 11 Chemistry Chapter 12 Organic Chemistry Some Basic Principles and Techniques with Answers 3 is known by which of the following names

1.Bicyclo-[2, 2, 2] octane

2.Bicyclo-[2, 2, 1] octane

3. Bicyclo-[1, 2, 1] octane

4.Bicyclo-[1, 1, 1] octane


Question:
The critical volumes of four gases A, B, C, D are respectively 0.025 L, 0.312 L, 0.245 L, 0.432 L, the gas with highest value of van der Wall constant b is

1.A

2.B

3.C

4.D


Question:
The displacement of electrons in a multiple bond in the presence of attacking reagent is called

1.Inductive effect

2.Electromeric effect

3.Resonance

4.Hyper conjugation.


Question:
The false statement among the followings:

1.The average residence time of NO is one month.

2. Limestone acts as a sink for SOx.

3.SOx can be removed from flue gases by passing through a solution of citrate ions

4.Ammonia acts as a sink for NOx.


Question:
The first fraction obtained during the fractionation of petroleum is:

1.Gasoline

2.Diesel Oil

3.Hydrocarbon Gases

4.Kerosene Oil


Question:
The lowest alkene, that is capable of exhibiting geometrical isomerism is

1.Ethene

2. But – 1- ene

3.But – 2 – ene

4.Propane


Question:
The most harmful air pollutant produced by automobiles is

1.HNO3

2.NO

3.SO2

4.CO


Question:
The order of decreasing reactivity towards an electrophilic reagent, for the following : (i) Benzene (ii) Toluene (iii) Chlorobenzene (iv) Phenol would be:

1.(i) > (ii) > (iii) > (iv)

2.(ii) > (iv) > (i) > (iii)

3.(iv) > (iii) > (ii) > (i)

4.(iv) > (ii) > (i) > (iii)


Question:
The position of double bond in alkenes can be located by

1.Hydrogenation of oil

2.Ozonolysis

3.Photolysis

4.Hydration


Question:
The rise or fall of a liquid within a tube of small bore is called:

1.Surface Tension

2. Capillary Action

3.Viscosity

4.Formation of Curvature


Question:
The state of matter that shows the uniformity of behavior :

1.Solid Liquid

2.Liquid

3.Gas

4.None of the above


Question:
The states of matter having no definite shape but definite volume:

1.Gas

2.Liquid

3.Solid

4.None of the above


Question:
The structure of diBorane contains

1.Four 2c – 2e bonds and two 3c – 2e bonds

2.Two 2c – 2e bonds and two 3c – 2e bonds

3.Two 2c – 2e bonds and two 3c – 3e bonds

4.Four 2c – 2e bonds and four 3c – 2e bonds


Question:
The substance which is a primary pollutant?

1.H2SO4

2.CO

3.PAN

4.Aldehydes


Question:
The theory which explains that gases consist of molecules, which are in rapid option is known as

1.Daltons Atomic Theory

2.Bohrs Theory

3.Rutherfords Atomic Theory

4. Kinetic Molecular Theory


Question:
The value of universal gas constant R depends on

1.Temperature of Gas

2.Volume of Gas

3.Number of Moles of Gas

4. Units of Volume,Temperature and Pressure


Question:
The volume of 2.8 g of carbon monoxide at 27°C and 0.0821 atm is

1.30 L

2.3 L

3.0.3 L

4.1.5 L


Question:
What is the correct IUPAC name of

1.4-methoxy-2-nitrobenzaldehyde

2. 4-formyl-3-nitro anisole

3.4-methoxy-6-nitrobenzaldehyde

4.2-formyl-5-methoxy nitrobenzene


Question:
What is the indicator of pollution in water?

1.Amount of oxygen

2. Amount of hydrogen

3.Amount of BOD

4.Amount of nitrogen


Question:
When excess of Kl is added to copper sulphate solution:

1.Cuprous iodide is formed

2.l2 is liberated

3.Potassium iodide is oxidized

4.All


Question:
Which element is estimated by Carius method

1.Carbon

2.Hydrogen

3.Halogen

4.Nitrogen


Question:
Which is most harmful for life on globe?

1.Deforestation

2.Soil Erosion

3. Increasing Desert

4.Nuclear Fallout.


Question:
Which is not the correct statement for Boron?

1. It exhibits Allotropy

2.It exists in both crystalline and Amorphous form

3. It forms solid chlorides

4.It forms volatile hydrides.


Question:
Which of the following acts as a sink for CO?

1.Plants

2.Haemoglobin

3. Microorganisms present in the soil

4.Oceans


Question:
Which of the following behaves both as a nucleophile and as an electrophile?

1. CH3C ≡ N

2.CH3OH

3.CH2 = CHCH3

4.CH3NH2


Question:
Which of the following cannot be represented by resonance structures?

1.Dimethyl ether

2.Nitrate anion

3.Carboxylate anion

4.Toluene


Question:
Which of the following compounds will exhibit geometrical isomerism?

1.1 – Phenyl – 2 – butene

2.3 – Phenyl – 1 – butene

3.2 – Phenyl – 1 butene

4.1, 1 – Diphenyl – propene


Question:
Which of the following has least covalent P−H bond?

1.PH+4

2.P2H+5

3.P2H2+6

4.PH3


Question:
Which of the following is produced by a reaction of ultraviolet light?

1.CO2

2.SO2

3.O3

4.NO3


Question:
Which of the following is responsible for depletion of ozone layer in the upper strata of the atmosphere?

1.Polyhalogens

2.Ferrocene

3.Fullerencs

4.Freons


Question:
Which of the following oxidation states are most characteristic for lead and tin respectively?

1.2, 2

2.4, 2

3.2, 4

4.4, 4


Question:
Which of the following statement is wrong for gases?

1. Gases do not have definite shape and volume

2. Volume of the gas is equal to the volume of the container confining the gas

3.Confined gas exert uniform pressure on the wall of the container in all directions

4.Mass of the gas cannot be determined by weighing a container in which it is contained


Question:
Which of the following statements regarding ozone is not correct?

1.The oxygen-oxygen bond length in ozone is identical with that of molecular oxygen

2.The ozone is response hybrid of two structures

3.The ozone molecule is angular in shape

4.Ozone is used as a germicide and disinfectant for the purification of air.


Question:
Which of the following will not produce hydrogen gas?

1.Reaction between Fe and dil. HCl

2. Reaction between Zn and NaOH

3.Reaction between Zn and conc. H2SO4

4.Electrolysis of NaCl in Nelsons cell


Question:
Which of the statement is true for the above sequence of reactions?

1.Z is hydrogen

2.X is B2H6

3.Z and Y are F2 and B2H6 respectively

4. Z is Potassium Hydroxide


Question:
Which one is strongest acid among following options?

1.CH2FCOOH

2.CH2ClCOOH

3.CHCl2COOH

4.CHF2COOH


Question:
Which one of the following conformations of cyclohexane is chiral?

1.Twist boat

2.Rigid

3.Chair

4.Boat


Question:
Which one of these is not true for benzene?

1.There are three carbon-carbon single bonds and three carbon-carbon double bonds.

2.Heat of hydrogenation of benzene is less than the theoretical value

3.It forms only one type of mono substituted product

4.The bond angle between carbon-carbon bonds is 120 Degree


Question:
Why certain parts of water bodies contain more number of algae?

1.Due to favorable environment

2.Due to run-off excess fertilizers

3. Due to lack of fertilizers

4. Due to water pollution


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