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Class 11

Chemistry

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Question Answers for Class 11 Chemistry by Vedantu are created by experts to help you excel in your board exams. These answers cover all the key questions from the CBSE Chemistry syllabus and explain every concept in a simple and easy-to-understand way.

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These solutions follow the CBSE curriculum closely, making them a reliable resource for thorough preparation and building a solid understanding of Chemistry.

Class 11 Chemistry Question Answers

The isotope of hydrogen which is radioactive is …………………..$(a){\\text{ Trithium}} \\\\(b){\\text{ Deuterium}} \\\\(c){\\text{ Nacent hydrogen }} \\\\(d){\\text{ Parahydrogen}} \\\\ $

How many structure isomers can you draw for pentane?(a). 2(b). 3(c). 4(d). 5

What is the valency of fluorine atoms?(a). 7(b). 1(c). 3(d). 6

Write the main reasons for the stability of colloidal sols.

Name the four types of elements of the periodic table based on the electronic configuration. Write on characteristics of each type.

What is a protective colloid?

The first member of the alkyne family is?A. EtheneB. MethyneC. EthyneD. Propyne

Would you expect the second electron to gain enthalpy of oxygen as positive more negative or less negative than the first? Justify your answer.

The correct order of polarizing power is$(a){\\text{ }}B{e^{ + 2}} M{g^{ + 2}} C{a^{ + 2}} {K^ + } \\\\(b){\\text{ }}B{e^{ + 2}} C{a^{ + 2}} M{g^{ + 2}} {K^ + } \\\\(c){\\text{ M}}{{\\text{g}}^{ + 2}} C{a^{ + 2}} B{e^{ + 2}} {K^ + } \\\\(d){\\text{ M}}{{\\text{g}}^{ + 2}} B{e^{ + 2}} C{a^{ + 2}} {K^ + } \\\\ $

Which of the following hydrocarbons are unsaturated? (This question has multiple correct answers)A. ${{H}_{3}}C-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}$B. ${{H}_{2}}C=C-C{{H}_{3}}$C. ${{(C{{H}_{3}})}_{2}}-C=C{{H}_{2}}$D. ${{(C{{H}_{3}})}_{3}}C-C{{H}_{3}}$

The equivalent weight of phosphoric acid (\\[{{H}_{3}}P{{O}_{4}}\\]) in the reaction is:\\[NaOH\\text{ }+\\text{ }{{H}_{3}}P{{O}_{4}}\\text{ }\\to \\text{ }Na{{H}_{2}}P{{O}_{4}}\\text{ }+\\text{ }{{H}_{2}}O\\]A. 25B. 49C. 59D. 98

Question- ‘Hydride gap’ is referred to which region of the periodic table?${\\text{A}}{\\text{.}}$ Group 3 4 and 5${\\text{B}}{\\text{.}}$ Group 5 6 and 7${\\text{C}}{\\text{.}}$ Group 7 8 and 9${\\text{D}}{\\text{.}}$ Group 3 5 and 7

The catalyst used for the conversion of ethene to ethane is commonly:A. NickelB. IronC. CobaltD. None of the above

Oxidation number of N in \\[N{H_4}N{O_3}\\]is:A.-3B.+5C.-3 and +5D.+3 and -5

IUPAC name of ${H_2}\\left[ {PtC{L_6}} \\right]$ is:A. Hydrogen hexachloroplatinate (IV)B. Dihydrogen hexachloroplatinate (IV)C. Hydrogen hexachloroplatinic (IV) acidD. Hexachloroplatinic (IV) acid

More is the coagulation value of electrolyte; its coagulation power is ____1.More2.Less3.Unchanged4.None of the above.

Loschmidt number is equal to:$(a)$ Molecules present in 2ml of gas at STP$(b){\\text{ 2}}{\\text{.69}} \\times {\\text{1}}{{\\text{0}}^{19}}$ Molecules of gas$(c){\\text{ 4}}{\\text{.46}} \\times {10^{ - 5}}$Mole of gas$(d)$ Both B and C

In which of the following molecules all atoms are not coplanar?A. \n \n \n \n \n B. \n \n \n \n \n C. \n \n \n \n \n D. \n \n \n \n \n

Which type of stoichiometric defect is shown by:$(i){\\text{ Zns (ii) AgBr}}$

The equivalent weight of $N{a_2}{S_2}{O_3}$ as reductant in the reaction $N{a_2}{S_2}{O_3} + {H_2}O + C{l_2} \\to N{a_2}S{O_4} + 2HCl + S$ is: [Given: Molecular weight of $N{a_2}{S_2}{O_3}$=M]A. M\/1B. M\/2C. M\/6D. M\/8

The strong smelling substance added to LPG is:A. Ethyl mercaptanB. EthanolC. EthanolD. Ethyl butane

To an ideal trigonometric gas 800 Cal heat energy is given at constant pressure. If the vibrational mode is neglected then energy used by gas in work done against surrounding is:A. 200 CalB. 300 CalC. 400 CalD. 60 Cal

What is the mass of one atom of S? (b) What is the atomic mass of S? (c ) What is the gram atomic mass of S?

Two closed vessels A and B of equal volume of $8.21L$ are connected by a narrow tube of negligible volume with an open valve. The left hand side container is found to contain $3\\ mole\\ C{O_2}$ and $2\\ mole\\ of\\ He$ at $400K$. What is the partial pressure of $He$ in vessel B at $500K?$ A. 2.4atmB. 8 atmC. 12 atmD. None of these

Urotropine is formed by the action of ammonia on which of the following?${\\text{A}}{\\text{.}}$ Acetaldehyde${\\text{B}}{\\text{.}}$ Formaldehyde${\\text{C}}{\\text{.}}$ Acetone${\\text{D}}{\\text{.}}$ Phenol

One mole of ${C{O_2}}$ contains?(A). $6.02\\times {{10} ^ {23}} $ atoms of oxygen(B). $6.02\\times {{10} ^ {23}} $ atoms of carbon(C). $18.10\\times {{10} ^ {23}} $ molecules of ${C{O_2}}$(D) $3$g atoms of ${C{O_2}}$

Multimolecular sols are present inA.Sol of sulphurB.Sol of proteinC.Sol of goldD.Soap solution

Which type of bond is present in nitrogen?A. Triple covalent bondB. Double covalent bondC. Ionic bondD. None of the above

Write a short note on: Tinning.

Which chemical is known as king of chemicals?A. ${ H }_{ 2 }{ CO }_{ 3 }$B. HClC. ${ CH }_{ 3 }COOH$D. ${ H }_{ 2 }{ SO }_{ 4 }$

Permanent hardness of water can be removed by Calgon method. If this is true enter 1 if false enter 0.

What is monoatomic diatomic triatomic and polyatomic ?

Monomer of polythene is:A.PropeneB.IsopreneC.ChloropreneD.Ethene

The Molarity of a dibasic acid is M. The equivalent weight of the acid is E. The amount of the acid present in 500 ml of the solution is:A. \\[2\\times M\\times E\\]B. \\[M\\times E\\]C. \\[\\dfrac{M\\times E}{2}\\]D. \\[\\dfrac{M\\times E}{4}\\]

Soaps are formed by saponification of?$(a){\\text{ alcohols}} \\\\(b){\\text{ glycosides}} \\\\{\\text{(c) simple esters}} \\\\{\\text{(d) carboxylic acids}} \\\\ $

Which of the following graphs represents Boyles’s law? This question has multiple correct options.\n \n \n \n \n

The molarity of heavy water ${ D }_{ 2 }O$ is :[assume density of ${ D }_{ 2 }O$ is 1g\/ml]A. 55.55 MB. 50.78 MC. 48 MD. 50 M

Nascent hydrogen is more powerful reducing agent than ordinary hydrogen because:A. Nascent hydrogen is in atomic state and atoms are more active than moleculesB. Nascent hydrogen is evolved in small bubbles containing the gas under great pressureC. Nascent hydrogen is activated by the energy liberated in the reaction in which it is formed so the nascent hydrogen becomes more energised and activeD. All of them

Na+ has completely filled K and L shells. Explain.

The oxidation number of Cr in \\[{K_2}C{r_2}{O_7}\\] is:A. +3B. -3C. +6D. -6

What will be the mass of one carbon atom in grams?

Zinc reacts with aqueous sodium hydroxide to form dihydrogen and _____.A. Zinc oxideB. Sodium zincateC. Zinc hydroxideD. Sodium precipitate

The charge to mass ratio of $\\alpha $- particle is approximately is_____ of the charge to mass ratio of a proton is:A. HalfB. TwiceC. Four timesD. Six times

The approximate atomic weight of electron or positron per mole is:\\[A.{\\text{ }}5.48 \\times {10^{ - 6}}gmo{l^{ - 1}} \\\\B.{\\text{ }}5.48 \\times {10^{ - 8}}gmo{l^{ - 1}} \\\\C.{\\text{ }}5.48 \\times {10^{ - 4}}gmo{l^{ - 1}} \\\\D.{\\text{ None of these}} \\\\ \\]

Which of the following is a drawback of the Rutherford model?(A). The orbital revolution of the electron is not expected to be stable(B). The electrons will follow a spiral path and then fall into the nucleus(C). Both A and B(D). None of the above

The mass of 1 mole of electron is:A. $0.55mg$B. $9.1 \\times \\mathop {10}\\nolimits^{ - 31} g$C. $9.1 \\times \\mathop {10}\\nolimits^{ - 27} g$D. $1.008g$

How is tooth decay related to pH? How can it be prevented?

Solute A is a ternary electrolyte and Solute B is non-electrolyte. If 0.1 M solution of solute B produces an osmotic pressure of 2P then 0.05 M solution of A at the same temperature will produce an osmotic pressure equal to: a. Pb. 1.5Pc. 2Pd. 3P

The purpose of the Contact process is to:A. Manufacture sulphuric acidB. Manufacture nitric acidC. Manufacture hydrochloric acidD. Manufacture sulphonic acid

The equivalent weight of acetic acid is?\\[A.{\\text{ }}60u \\\\B.{\\text{ }}120u \\\\C.{\\text{ }}30u \\\\D.{\\text{ }}40u \\\\ \\]

The reaction of water with slaked lime is ______reaction. Here calcium oxide and water react to form______?

What is the pH of acid rain? A. 5.8B. 5.5C. 4.2D. 3.8

Which of the following has the Frenkel defect?A. Sodium chlorideB. GraphiteC. Silver bromideD. Diamond

Sodium bicarbonate is also known as:(A). Washing soda(B). Baking soda(C). Glauber’s salt(D).Lime soda

The crystalline forms of carbon are diamond graphite and______.A. CoalB. CokeC. CharcoalD. Fullerene

Soda extract is prepared by:A. Fusing soda and mixture and then extracting with water.B. Dissolving $NaHC\\mathop O\\nolimits_3 $ and mixture in $dil.HCl$.C. Boiling $\\mathop {Na}\\nolimits_2 C\\mathop O\\nolimits_3 $ and mixture in $dil.HCl$.D. Boiling $\\mathop {Na}\\nolimits_2 C\\mathop O\\nolimits_3 $and mixture in distilled water.

The elements with highest electronegativity is:A. CB. SiC. GeD. Sn

Molten sodium chloride conducts electricity due to presence of:A. Free electronsB. Free moleculesC. AtomsD. Free ions

Valency of iron in \\[FeC{{l}_{2}}\\]……... is and in \\[FeC{{l}_{3}}\\] it is ………? a.) 3 2b.) 3 4c.) 2 3d.) 2 4

Which one of the following is not an ore of aluminium?(a) Bauxite(b) Corundum(c) Epsomite(d) Cryolite

The molecular formula of ethanol is:A. $(CH_{ 3 })_{ 2 }CHOH$B. $C_{ 2 }H_{ 5 }OH$C. $CH_{ 3 }OH$D. $CH_{ 3 }CH_{ 2 }CH_{ 2 }OH$

Why is tungsten used in the manufacture of electric bulbs? ${\\text{A}}{\\text{.}}$ It is cheaper than other metals${\\text{B}}{\\text{.}}$ It is both durable and economical${\\text{C}}{\\text{.}}$ It has high melting point${\\text{D}}{\\text{.}}$ It makes the bulb light brighter

In the Lassaigne’s test for the detection of nitrogen in the organic compound the blue coloured compound formed is:A. Ferric ferricyanideB. Ferrous ferricyanideC. Ferric ferrocyanideD. Ferrous ferrocyanide

Write a chemical test to distinguish between aldehyde and ketone (Give reason).

Oxidation number of N in \\[{\\text{HN}}{{\\text{O}}_3}\\] is:A. -3.5B. +3.5C. -6D. None of these.

Which of the following allotropes of silicon burns (oxidizes) in the air?A. Amorphous silicon.B. Crystalline silicon.C. Both A and B.D. None of the above.

The mole fraction of $NaCl$ in a solution containing 1 mole of $NaCl$ in 1000g of water:A. 0.0177B. 1.001C. 0.5D. 0.244

Which of the following elements has the highest electron-gain enthalpy?A. OxygenB. FluorineC. ChlorineD. Neon

Which of the following is a non-metal that remains liquid at room temperature?$Br Cl He P$

The valency of metal whose sulfate is $MS{O_4}$ is 2.A. TrueB. False

Which of the following elements has maximum photoelectric effect?A. LiB. NaC. KD. Cs

What is the mass of a molecule of water?a) 18 gramsb) 2.99 × 10-23 grams\nc) Both of the aboved) None of the above

“To pour water on calcium oxide”. Which is another way to classify the reaction? Explain.

The composition of water gas is:A. $CO + {N_2}$B. $CO + {H_2}$C. $CO + C{O_2}$D. $CO + C{O_2} + C{H_4}$

State Mendeleev’s periodic law.

The red brown gas is released on heating lead nitrate due to:A. DecompositionB. Single displacementC. Both A and BD. Reduction

The positively charged center in an atom is called as:A. NucleusB. NeutronsC. ProtonsD. Electrons

What is the molecular formula of Marshall's acid?\\[A.{\\text{ }}{H_2}S{O_5} \\\\B.{\\text{ }}{H_2}{S_2}{O_8} \\\\C.{\\text{ }}{H_2}S{O_4} \\\\D.{\\text{ }}{H_2}{S_2}{O_7} \\\\ \\]

In the following equation name the compound which is oxidized and which is reduced?$Mn{O_2} + 4HCl \\to MnC{l_2} + 2{H_2}O + C{l_2}$

Which metal easily gives ${{\\text{H}}_{2}}$ gas when it reacts with NaOH?(a). Mg(b). Zn(c). Cu(d). Ag

One of the group $ - OC{H_3}$ is :A. Stronger +R group than -OHB. Weaker +R group than -OHC. Weaker +I group than -OHD. Inert group

The covalent compound HCl has partial ionic character because:A. Electronegativity of hydrogen is greater than that of ChlorineB. Electronegativity of hydrogen is same as that of ChlorineC. Electronegativity of hydrogen is less than that of ChlorineD. Hydrogen is a metal while Chlorine is a non-metal

In Hunsdiecker reaction the alkyl bromide contains one carbon less than those in_______A. Carboxylic acidB. Oxalic acidC. HypohaliteD. None of these

The non-metal which is a liquid at room temperature:A. ChlorineB. NitrogenC. BromineD. Hydrogen

Lake Test of $A{l^{3 + }}$ ion is based on adsorption of blue litmus on solid surface of:\\[A.{\\text{ }}Al \\\\B.{\\text{ }}Al{\\left( {OH} \\right)_3} \\\\C.{\\text{ }}A{l_2}{O_3} \\\\D.{\\text{ }}AlC{l_3} \\\\ \\]

The average kinetic energy of an ideal gas per molecule in SI units at ${25^0}C$ will be\\[A.{\\text{ }}6.17 \\times {10^{ - 21}}J{K^{ - 1}} \\\\B.{\\text{ }}6.17 \\times {10^{ - 21}}kJ{K^{ - 1}} \\\\C.{\\text{ }}6.17 \\times {10^{20}}J{K^{ - 1}} \\\\D.{\\text{ }}7.16 \\times {10^{ - 21}}J{K^{ - 1}} \\\\ \\]

The no. of P – O – P bond (s) in cyclic metaphosphoric acid is (are):A. 0B. 2C. 3D. 4

The percentage of carbon in cast iron varies from:A. 0.5 to 1B. 0.1 to 0.5C. 1 to 1.7D. 1.7 to 4.5

The unit of entropy is:a. \\[J{{K}^{-1}}mo{{l}^{-1}}\\]b. \\[k{{J}^{-1}}mo{{l}^{-1}}\\]c. \\[kJmo{{l}^{-1}}\\]d. \\[~{{J}^{-1}}{{K}^{-1}}mo{{l}^{-1}}\\]

I.U.P.A.C. stands for?A. Iodine Under Packing B. International Union of Pure and Applied Chemistry C. International Units of Protein and CarbohydratesD. International Understanding on Physical Aspects of Chemistry

Is moment of inertia is a scalar quantity?

Which of the following is not a basic physical quantity?A.) LengthB.) TimeC.) DensityD.) Amount of substance

Which one of the following is a compound?(A). The black residue left when sugar is charred(B). Nitrogen gas(C ). Air(D). Carbon dioxide

In the depression of freezing point experiment it is found that the: This question has multiple correct options$A.$ Vapour pressure of the solution is less than that of pure solvent$B.$ Vapour pressure of the solution is more than that of pure solvent $C.$ Only solute molecules solidity at the freezing point $D.$ Only solvent molecules solidity at the freezing point

Which metal does not react with water?A. \\[Cu\\]B. \\[Au\\]C. Both “A” and “B”D. \\[Fe\\]

Oxidation number of O in ${ H }_{ 2 }{ O }_{ 2 }$ is?A) 1-B) 0C) 2+D) 3+

Name the most reactive element in Group VIIA of the periodic table.

Which of the following is the correct order of C-O bond length?$\\begin{align} a)CO C{{O}_{3}}^{2-} C{{O}_{2}} \\\\ b)CO C{{O}_{3}}^{-} C{{O}_{2}} \\\\ c)CO C{{O}_{2}} C{{O}_{3}}^{2-} \\\\ d)C{{O}_{2}} C{{O}_{3}}^{2-} CO \\\\ \\end{align}$

Write the balanced chemical equations for the following reactions: Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride water and liberates carbon dioxide.A. \\[NaHC{{O}_{3}}+2HCl\\to NaCl+2{{H}_{2}}O+C{{O}_{2}}\\]B. \\[2NaHC{{O}_{3}}+2HCl\\to NaCl+{{H}_{2}}O+2C{{O}_{2}}\\]C. \\[NaHC{{O}_{3}}+HCl\\to NaCl+{{H}_{2}}O+C{{O}_{2}}\\]D. \\[2NaHC{{O}_{3}}+2HCl\\to 2NaCl+{{H}_{2}}O+C{{O}_{2}}\\]

Prepare with Vedantu’s Class 11 Chemistry Question Answers

Prepare better with Vedantu’s Question Answers for Class 11 Chemistry. These solutions cover every topic from the syllabus, with clear and simple explanations to make learning easier.

Vedantu provides step-by-step answers crafted by experts to ensure you understand concepts deeply and gain confidence for your board exams. With these trusted resources, studying Chemistry becomes more effective and stress-free. Let Vedantu help you achieve your academic goals and ace your exams!