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Class 12

Chemistry

Master Class 12 Chemistry: Eng...

Class 12 Chemistry Question Answers

Class 12 Chemistry Made Easy – Get Accurate Answers Now

Welcome to the Class 12 Chemistry Question Answers page on Vedantu, designed to help you excel in your exams and enhance your understanding of crucial chemistry concepts. Chemistry is a fascinating subject that explores the building blocks of matter, and with the right tools, you can confidently master it. Whether you're revisiting a chapter, clarifying doubts, or deepening your knowledge, Vedantu's comprehensive Q&A page is here to support your learning journey.

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Class 12 Chemistry Question Answers

What is standard hydrogen electrode ?

Molecular mass of Benzene is ……………..g\/molA. 72B. 78 C. 79D. 77

Evaporation is a surface phenomenon. Explain.

Nylon is an example of thermoplastic$(a){\\text{ True}} \\\\{\\text{(b) False}} \\\\ $

What is the geometry of the chromate ion?A. TetrahedralB. OctahedralC. Trigonal planarD. Linear

In the Castner process for the extraction of sodium the anode is made up of ………… metal.a.) Copperb.) Carbonc.) Sodiumd.) Nickel

Explain why Nitrolim is used as a fertiliser.

Which of the following is not a Noble gas?A. HeliumB. NeonC. ArgonD. Hydrogen

The conductivity of an electrolytic solution decreases on dilution due to:a.) Decreases in number of ions per unit volumeb.) Increases in ionic mobility of ions c.) Increase in percentage ionizationd.) Increase in number of ions per unit volume

The type of glass used in making lenses and prisms is:a.) A flint glassb.) Jena glassc.) Pyrex glassd.) Quartz glass

Identify the Number of pi bonds in the cyclic structure of $S_3$$O_9$.

Give simple chemical tests to distinguish between the following pairs of compounds.a.) Propanal and Propanoneb.) Acetophenone and Benzophenonec.) Phenol and Benzoic acidd.) Benzoic acid and Ethyl benzoatee.) Pentan-2-one and Pentan-3-onef.) Benzaldehyde and Acetophenoneg.) Ethanal and Propanal

\"Middle row anomaly\" is related with: This question has multiple correct options A. Stability of transition metal oxides B. Stability of alkali metal oxides C. Instability of halogen oxides D. Stability of alkaline earth metal oxides

The correct chemical formula of ammonium phosphate is:a.) \\[{N_2}{H_6}P{O_4}\\]b.) \\[{(N{H_3})_3}P{O_4}\\]c.) \\[{(N{H_4})_3}P{O_4}\\]d.) \\[{(N{H_4})_2}P{O_4}\\]

What does soda water contain?(A). Carbonic acid(B). Sulphuric acid(C). Carboxylic acid(D). Nitrous acid

Phenolphthalein in acid shows: a.) blue b.) red c.) pink\/purple d.) colorless e.) orange

AgCl and NaCl are colourless. NaBr and NaI are colourless but AgBr and AgI are coloured. This is because:a.) \\[A{g^ + }\\] polarises \\[B{r^ - }\\] and \\[{I^ - }\\]b.) \\[A{g^ + }\\] has unpaired d – orbital.c.) \\[A{g^ + }\\] depolarises \\[B{r^ - }\\] and \\[{I^ - }\\]d.) None of the above is correct

Sulfuric acid is produced by lead chamber process with following exothermic reaction$2\\text{S}{{\\text{O}}_{2}}+{{\\text{O}}_{2}}\\overset{\\text{NO}}{\\leftrightarrows}2\\text{S}{{\\text{O}}_{3}}\\overset{\\text{ }{{\\text{H}}_{2}}\\text{O }}\\longrightarrow{{\\text{H}}_{2}}\\text{S}{{\\text{O}}_{4}}$ What is the role of NO in the given exothermic reaction?(a) Oxidising agent(b) Reducing agent(c) Catalyst(d) None of these

Which of the following will react most readily with HI?a.) $\\text{C}{{\\text{H}}_{\\text{3}}}\\text{OH}$b.) ${{\\left( \\text{C}{{\\text{H}}_{\\text{3}}} \\right)}_{\\text{3}}}\\text{COH}$c.) $\\text{C}{{\\text{H}}_{\\text{3}}}\\text{C}{{\\text{H}}_{\\text{2}}}\\text{OH}$d.) ${{\\left( \\text{C}{{\\text{H}}_{\\text{3}}} \\right)}_{\\text{2}}}\\text{CHOH}$

Name two gases which can be used in the study of the fountain experiment.A. Ammonium chloride and hydrogen chloride gas.B. Ammonia and hydrogen chloride gas.C. Ammonia gas and chlorine gas.D. Ammonia gas and hydrogen gas.

What is the effect of Frenkel defect on the density of ions solids?(a) The density of the crystal increases.(b) The density of the crystal decreases.(c) The density of the crystal remains unchanged.(d) There is no relationship between density of a crystal and defect present in it.

An example of secondary battery cell is:A.Edison Alkaline cellB.Daniel cellC.Lechanche cellD.Bunsen cell

An aqueous solution contains an unknown concentration of \\[B{{a}^{+2}}\\]. When 50 mL of a 1 M solution of \\[N{{a}_{2}}S{{O}_{4}}\\] is added \\[BaS{{O}_{4}}\\] just begins to precipitate. The final volume is 500 ml. The solubility product of \\[BaS{{O}_{4}}\\] is \\[1\\times {{10}^{-10}}\\]. Find the concentration of \\[B{{a}^{+2}}\\]in the original solution?\\[a)~~~~1.1\\times {{10}^{-9}}M\\]\\[b)\\text{ }1.0\\times {{10}^{-10}}M\\]\\[c)~~~~5\\times {{10}^{-9}}M\\]\\[d)~~~2\\times {{10}^{-9}}M\\]

The insecticide Gammexane is:A. DDTB. Benzene hexachlorideC. ParathionD. Chloral

The ease of dehydrohalogenation of alkyl halide with alcoholic KOH is:A. \\[{3^0} {2^0} {1^0}\\]B. \\[{3^0} {2^0} {1^0}\\]C. \\[{3^0} {2^0} {1^0}\\]D. \\[{3^0} {2^0} {1^0}\\]

How can ethanol be converted to propanone?

The IUPAC name of $[Ni(CO)_4]$ and $[PtCl_4]^{2−}$.

Which one of the following complexes will most likely absorb the visible light?[Atomic numbers: Sc = 21 Ti = 22 V = 23 Zn = 30]A. \\[{[Sc{({H_2}O)_6}]^{ + 3}}\\]B. \\[{[Ti{(N{H_3})_6}]^{ + 4}}\\]C. \\[{[V{(N{H_3})_6}]^{ + 2}}\\]D. \\[{[Zn{(N{H_3})_6}]^{ + 2}}\\]

Which of the following noble gases is used in the treatment of cancer?A. XeB. ArC. RnD. Kr

Ethyne on passing through a red hot iron tube gives:A. MesityleneB. BenzeneC. ButenyneD. None

The coordination number of cation and anion in fluorite $(Ca{F_2}){\\text{ and CsCl}}$ are respectively:$(a){\\text{ 8:4 and 6:3}} \\\\(b){\\text{ 6:3 and 4:4}} \\\\(c){\\text{ 8:4 and 8:8}} \\\\(d){\\text{ 4:2 and 2:4}} \\\\ $

The magnetic behaviour or geometry of the complex $\\left[ {Ni{{\\left( {CO} \\right)}_4}} \\right]$ is-A. Square planar geometry and paramagneticB. Square planar geometry and diamagneticC. Tetrahedral geometry and paramagneticD. Tetrahedral geometry and diamagnetic

A toxic gas with rotten egg-like smell ${{\\text{H}}_2}{\\text{S}}$ is used for qualitative analysis. If the solubility of ${{\\text{H}}_2}{\\text{S}}$ in water at STP is 0.195 m. Calculate Henry’s law constant.

What are the hybridizations of ${\\text{ICl}}_2^ - $ and ${\\text{ClO}}_4^ - $ respectively?${\\text{A}}{\\text{. s}}{{\\text{p}}^3}{{\\text{d}}^2}{\\text{ s}}{{\\text{p}}^3} \\\\{\\text{B}}{\\text{. s}}{{\\text{p}}^2}{\\text{ s}}{{\\text{p}}^3}{\\text{d}} \\\\{\\text{C}}{\\text{. s}}{{\\text{p}}^3}{\\text{d s}}{{\\text{p}}^3} \\\\ $${\\text{D}}{\\text{.}}$ None of these

Which of the following are the demerits of the Mendeleev periodic table?(a) No proper position of hydrogen is given(b) Grouping of chemically dissimilar elements(c) Position given to isotopes(d) Presence of anomalous pairs

Which of the following is not an example of thermite reaction?(a) $\\text{C}{{\\text{r}}_{2}}{{\\text{O}}_{3}}+2\\text{Al}\\to \\text{A}{{\\text{l}}_{2}}{{\\text{O}}_{3}}+2\\text{Cr}$(b) $\\text{3M}{{\\text{n}}_{3}}{{\\text{O}}_{4}}+8\\text{Al}\\to \\text{4A}{{\\text{l}}_{2}}{{\\text{O}}_{3}}+9\\text{Mn}$(c) $2\\text{HgO+HgS}\\to \\text{3Hg+S}{{\\text{O}}_{2}}$(d) $2\\text{C}{{\\text{u}}_{2}}\\text{S+3}{{\\text{O}}_{2}}\\to 2\\text{C}{{\\text{u}}_{2}}\\text{O+S}{{\\text{O}}_{2}}$

Alcoholic KOH is used for:(A) Dehydration(B) Dehydrogenation(C) Dehydrohalogenation(D) Dehalogenation

Cooking gas is a mixture of:A. Carbon monoxides and carbon dioxideB. Butane and propaneC. Methane and ethylene D. Carbon dioxide and oxygen

Gatterrmann reaction is given by:A. \\[{{C}_{6}}{{H}_{6}}\\]B. \\[{{C}_{6}}{{H}_{6}}-C{{H}_{3}}\\]C. \\[{{C}_{6}}{{H}_{6}}-Cl\\]D. All of these

Which of the following has the highest boiling point?A.1-ChloropentaneB.2-chloropentaneC.3-chloropentaneD.All have equal boiling point

What is the IUPAC nomenclature of $Ni{\\left( {CO} \\right)_4}$ ?(A) Tetracarbonyl Nickel (I)(B) Tetracarboxy Nickel (0)(C) Tetracarbonyl Nickel (0)(D) None of these

Milk is an emulsion in which :A . a gas is dispersed in water B . lactose is dispersed in waterC . milk fat is dispersed in waterD . a solid is dispersed in water

If the radius of \\[N{{a}^{+}}\\]is 95 pm and that of \\[C{{l}^{-}}\\]is 181 pm then:A. coordination number of \\[N{{a}^{+}}\\]is 6B.coordination number of \\[C{{l}^{-}}\\]is 8C.length of the unit cell is 552 pm D.length of the unit cell is 380 pm

Write the IUPAC names of the following components and classify them into primary and tertiary amines-(A) ${\\left( {C{H_3}} \\right)_2}CHN{H_2}$(B) $C{H_3}{(C{H_2})_2}N{H_2}$(C) $C{H_3}NHCH{(C{H_3})_2}$(D) ${\\left( {C{H_3}} \\right)_3}CN{H_2}$(E) ${C_6}{H_5}NHC{H_3}$(F) ${\\left( {C{H_3}C{H_2}} \\right)_2}NC{H_3}$(G) $m - Br{C_6}{H_4}N{H_2}$

Define chemical twins. Write the general electronic configuration of actinoids.

${\\text{Ethanol}}\\xrightarrow{{{P_4}\/{I_2}}}X\\xrightarrow[{HBr}]{{KOH\\left( {alc.} \\right)}}Y$In this sequence of reaction Y is:a.) Etheneb.) Bromoethanec.) Ethanold.) None of these

Which of the following compounds does not undergo Hell-Volhard-Zelinsky reaction?${\\text{A}}{\\text{.}}$ Ethanoic acid${\\text{B}}{\\text{.}}$ Propionic acid${\\text{C}}{\\text{.}}$ Iso-butyric acid${\\text{D}}{\\text{.}}$ Trichloroacetic acid

Butter of tin is:a.) \\[SnC{{l}_{2}}.5{{H}_{2}}O\\]b.) \\[SnC{{l}_{2}}\\]c.) \\[SnC{{l}_{4}}\\]d.) \\[SnC{{l}_{4}}.5{{H}_{2}}O\\]

Hydrolysis of \\[NC{{l}_{3}}\\] gives \\[N{{H}_{3}}\\] and X. Which of the following is X?a.) \\[HCl{{O}_{4}}\\]b.) \\[HCl{{O}_{3}}\\]c.) HOCld.) \\[HCl{{O}_{2}}\\]

A metal used in storage batteries is:A.\t$Cu$B.\t$Pb$C.\t$Sn$D.\t$Ni$

The bonds present in borazine or inorganic benzene are:A. $12\\sigma ~3\\pi $B. $9\\sigma ~6\\pi $C. $6\\sigma ~6\\pi $D. $9\\sigma ~9\\pi $

During electrolytic refining of zinc it gets:A. Deposited on cathodeB. Deposited on anodeC. Deposited on cathode as well as anodeD. Remains in the solution

Which of the following is not a chemical change?(A) Sublimation(B) Combustion(C) Electrolysis(D) Rusting

An example of lyophilic colloid is:A.colloidal solutions of metalB.sulphur in waterC.gelatinD.$Fe{(OH)}_{3}$

Distinguish between the true solution and colloidal solution.

The order of electronegativity for halogens is A.F Cl Br IB.I Br Cl FC.I Cl Br FD.Cl F Br I

Write the name of two metals that are used in maximum composition in mischmetal?

Which of the following properties is different between two members of a homologous series?(A) General Formula(B) Molecular weights(C) Methods of preparation(D) Chemical properties

Benzyl chloride ${C_6}{H_5}C{H_2}Cl$ can be prepared from toluene by chlorination with :A. $C{l_2}$B. $S{O_2}C{l_2}$C. $SOC{l_2}$D. $NaOCl$

Laughing gas is _______a.) Nitrogen pentoxideb.) Nitrous oxide c.) Nitrogen trioxided.) Nitric oxide

Which of the following is most soluble in water? a.) n-butyl alcoholb.) Iso-butyl alcoholc.) Tertiary butyl alcohold.) None of these

Proteins are the polymers of __________.A. FormaldehydesB. Secondary aminesC. Amino acidsD. Ammonia

Write the definition of Kohlrausch law of independent migration of ions.

The extremely high melting point of diamond (carbon) may be explained by the:A. Network covalent bondsB. Ionic bondsC. Hydrogen bondsD. Van der Waals forcesE. None of the above

The full form of ATP is Adenosine triphosphate. If true enter 1 else enter 0.

Differentiate true solution and colloidal solution.

How is \\[C{{O}_{2}}\\] gas tested in the laboratory?

Dettol is a mixture of:A) Chloroxylenol and terpineol in a suitable solvent.B) Formaldehyde and phenol in the solvent waterC) Tincture of iodine and chloroformD) \\[KMn{{O}_{4}}\\] and iodoform.

Give the structure of sucrose.

A white precipitate insoluble in \\[HN{{O}_{3}}\\] is formed when the aqueous solution of x in NaOH is treated with barium chloride and bromine water. So x is :A. $S{{O}_{3}}$\tB. $S{{O}_{2}}$C. $C{{O}_{2}}$D. None of the above

Question: Geometry of $B{F_3}$ isA: Trigonal planarB: Pentagonal C: LinearD: Tetrahedral

Explain addition polymers with an example?

Which of the following ether is called phenetole?[A]$PhOC{{H}_{3}}$[B]$PhO{{C}_{2}}{{H}_{5}}$[C]$PhO{{C}_{3}}{{H}_{7}}$[D]$p-N{{O}_{2}}-{{C}_{6}}{{H}_{4}}-O{{C}_{2}}{{H}_{5}}$

Glycerine contains which type of one hydroxyl group?A. SecondaryB. PrimaryC. TertiaryD. None of these

Explain HVZ reaction with example.

Write the chemical name of one antifertility drug.

What is the difference between physisorption and chemisorption?

How is Methoxyethane prepared from:(a) Methyl iodide (b) Diazomethane

The terms order and molecularity are common in chemical kinetics.(A) What do you mean by order and molecularity?(B) (1) Write two factors influencing rate of reaction.(2) Write Arrhenius equation

Ethylene glycol is used as an antifreeze agent. Calculate the amount of ethylene glycol used to be added to ${ 4kg }$ of water to prevent it from freezing at ${ -6 }^{ \\circ }{ C }$ ${ K }_{ f }$ for water = ${ 1.85Kmol }^{ -1 }{ Kg }$

What are the main constituents of dettol?

What happens when? (1) \\[PC{l_5}\\] is heated(2) ${H_3}P{O_3}$ is heated?Write the reaction involved.

2-Bromopentane is treated with an alcoholic KOH solution. What will be the major product formed in this reaction and what is this type of elimination called?(A.) Pent-1-ene $\\beta$- Elimination(B.) Pent-2-ene $\\beta$- Elimination(C.) Pent-1-ene Nucleophilic substitution(D.) Pent-2-ene Nucleophilic substitution

(a) Explain the condensation polymer by an example.(b) Give one example each of thermoplastic and thermosetting polymers.(c) Give the names of monomers used for obtaining Buna-N.

Give preparation and uses of Nylon 6 6.

Correct order of electrophilic substitution reaction?\n \n \n \n \n A. \\[abcd\\]B. \\[dbac\\]C. \\[bacd\\]D. \\[badc\\]

At which temperature chemical adsorption occurs?A. Very low temperatureB. High temperatureC. Low temperatureD. Temperature does not affect

The number of hydrogen bonds between Guanine and Cytosine; and between Adenine and Thymine in DNA are:A.${ 1 2 }$B.${ 3 2 }$C.${ 3 1 }$D.${ 2 1 }$

Write the mechanism of hydration of ethene to yield ethanol.

Enzymes are made up of?(A) Edible proteins(B) Proteins with specific structure(C) Nitrogen containing carbohydrates(D) Carbohydrates

\\[\\text{KMn}{{\\text{O}}_{4}}\\](acidic\/alkaline) is not decolourised by:A. Mohr saltB. Oxalic acidC. BenzeneD. Propene

What is the structural difference between high density polythene (HDP) and low density polythene (LDP)?

Reaction of bromine water phenol gives white ppt of:A. o – bromophenolB. p – bromophenolC. 2 4 6 – tribromophenolD. m – bromophenol

Among the given reactions which is faster and why?i. \\[Me-CHCl-Me\\xrightarrow{alc.KOH}C{{H}_{3}}-CH=C{{H}_{\\begin{smallmatrix}2 \\\\ \\end{smallmatrix}}}\\]ii. \\[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-Cl\\xrightarrow{alc.KOH}C{{H}_{3}}-CH=C{{H}_{2}}\\]

In a catalytic conversion of ${N_2}$ to $N{H_3}$ by Haber's process the rate of reaction was expressed as change in the concentration of ammonia per time is $40 \\times {10^{ - 3}}{\\text{ }}mol{\\text{ }}{L^{ - 1}}{\\text{ }}{s^{ - 1}}$ . If there is no side reaction the rate of the reaction as expressed in terms of hydrogen is:(in $mol{\\text{ }}{L^{ - 1}}{\\text{ }}{s^{ - 1}}$)\\[A.{\\text{ }}60 \\times {10^{ - 3}} \\\\B.{\\text{ }}20 \\times {10^{ - 3}} \\\\C.{\\text{ }}1.200 \\\\D.{\\text{ }}10.3 \\times {10^{ - 3}} \\\\ \\]

Name a salt of a strong acid like \\[HN{{O}_{3}}\\] and a weak base like \\[N{{H}_{4}}OH\\]. Represent the reaction that takes place.

Which is an example of auto catalyst?A. Hydrolysis of ethyl acetateB. Decomposition of TNG C. Oxidation of oxalic acid D. All of the above

Write about Gabriel phthalimide synthesis ?

The Oxidation State and Effective Atomic Number (EAN) of Cobalt in \\[{[Co{F_6}]^{ - 2}}\\]are respectivelyA.3 and 36B.4 and 35C.4 and 37D.2 and 35

The following diagram represents the industrial preparation of nitric acid from ammonia \\[N{H_3} + {O_2}\\] (from excess of air).\\[\\mathop {N{H_3} + {O_2}}\\limits_{(excess{\\text{ }}air)} \\xrightarrow[{(900^\\circ C)}]{{(A)}}NO\\xrightarrow[{Air}]{{(B)}}(C)\\xrightarrow[{water}]{}HN{O_3} + NO\\]Which of the following options correctly describes the reagents products and reaction conditions?A.A – Catalyst and high pressure B – Cool C – \\[N{O_2}\\]B.A – Catalyst B – Cool C – \\[N{O_2}\\]C.A – Catalyst and high pressure B – high pressure C – \\[N{O_2}\\]D.A –high pressure B – Catalyst C – \\[{N_2}{O_3}\\]\t

Differentiate between homogeneous and heterogeneous mixtures with examples?

How will you bring about the following conversions?(1) Ethanol to but-1-yne(2) Ethane to bromoethene(3) Propene to 1-nitropropane(4) Toluene to benzyl alcohol(5) Propene to propyne(6) Ethanol to ethyl fluoride(7) Bromoethane to propanone(8) But-1-ene to but-2-ene(9) 1-chlorobutane to n-octane(10) Benzene to biphenyl

Write the difference between solid, liquid and gas phase?

Why is sulphuric acid not used during the reaction of alcohols with KI?

Write the chemical formulae of the following by criss-cross method:A.Magnesium chlorideB.Calcium oxideC.Copper nitrateD.Aluminium chlorideE.Potassium nitrate

State and prove Raoult's law for non-volatile solute in volatile solvent. Also give any two limitations of the law.

How many states of matter are there in total?\t

What happens when:(A) n- butyl chloride is treated with alcoholic KOH.(B) Bromobenzene is treated with Mg in the presence of dry ether.(C) Chlorobenzene is subjected to hydrolysis(D) Ethyl chloride is treated with aqueous(E) Methyl bromide is treated with sodium in the presence of dry ether.(F) Methyl chloride is treated with KCN.

When dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observation made is:A) The surface of metal turns shining.B) The reaction mixture turns milky.C) The odour of chlorine is observed.D) A colourless and odourless gas evolves with bubbles.

Identify the functional group in the given compound:\n \n \n \n \n

A chemical compound ‘X’ is used in the soap and glass industry. It is prepared from brine.(a) Write the chemical name, common name and chemical formula of ‘X’.(b) Write the equation involved in its preparation.(c) What happens when it is treated with water containing $Ca$ and $Mg$ salts?

Write down the rules of IUPAC Nomenclature.

Give one chemical test to distinguish between ethylamine and aniline.

Draw the chain isomers of hexane (${{C}_{6}}{{H}_{14}}$ ).

How do you convert benzoic acid to benzaldehyde?

Differentiate between lanthanoids and actinoids.

a) Tabulate the differences in the characteristics of states of matter.(b) Comment upon the following: Rigidity, Compressibility, fluidity, filling a gas container, shape, kinetic energy, and density.

Distinguish between esterification and saponification reactions of organic compounds.

How can ethanol and ethanoic acid be differentiated on the basis of their physical and chemical properties?

a. Give chemical tests to distinguish between:1. Propanal and propanone2. Benzaldehyde and acetophenoneb. Arrange the following compounds in an increasing order of their property as indicated:1. Acetaldehyde, acetone, methyl tert butyl ketone (reactivity towards \\[{\\text{HCN}}\\])2. Benzoic acid, 3,4-dinitrobenzoic acid, 4-methoxybenzoic acid (acid strength)3. ${\\text{C}}{{\\text{H}}_{\\text{3}}}{\\text{C}}{{\\text{H}}_{\\text{2}}}{\\text{CH(Br)COOH}}$, ${\\text{C}}{{\\text{H}}_{\\text{3}}}{\\text{CH(Br)C}}{{\\text{H}}_{\\text{2}}}{\\text{COOH}}$, ${{\\text{(C}}{{\\text{H}}_{\\text{3}}}{\\text{)}}_{\\text{2}}}{\\text{CHCOOH}}$ (acid strength)

Write the mechanism of hydration of ethene to yield ethanol.

The principle involved in paper chromatography is:A) AdsorptionB) PartitionC) SolubilityD) Volatility

Define Van’t Hoff factor. How is it related to the degree of dissociation?

Is ammonia a strong or weak ligand?

Ethanol and ethanoic acid can be differentiated based ona.) Melting point b.) Litmus paper testc.) Sodium bicarbonate d.) All of the above.

Calculate the temporary and permanent hardness of water sample having the following the following constituents per litre:\\[Ca{{\\left( HC{{O}_{3}} \\right)}_{2}}=162mg\\],\\[MgC{{l}_{2}}=95=mg\\],\\[NaCl=585mg\\],\\[Mg{{\\left( HC{{O}_{3}} \\right)}_{2}}=73mg\\],\\[CaS{{O}_{4}}=136mg~\\]A.\\[200ppm,\\text{ }150ppm\\]B.\\[100ppm,150ppm\\]C.\\[150ppm\\text{ }200ppm\\]D.\\[150ppm,\\text{ }150ppm\\]

Write the steps to convert methane to ethane.

Calculate the freezing point of a solution containing 60 g of glucose (Molar mass= 180 g\/mol) in 250 g of water.

The correct order of reactivity towards electrophilic substitution is?a.) Benzene phenol benzoic acid chlorobenzeneb.) Phenol benzene chlorobenzene benzoic acidc.) Chlorobenzene benzoic acid phenol benzene d.) Benzoic acid chlorobenzene benzene phenol

Distinguish between tetrahedral voids and octahedral voids.

Ammonia is a base but does not contain hydroxyl groups.

How will you convert aniline to phenol?

What type of defect is shown by NaCl in:(a) Stoichiometric defects, and(b) Non-stoichiometric defects

How is potassium dichromate prepared from a sample of chromite ore? Give a balanced equation for the chemical reactions involved.

An aldehyde as well as a ketone can be represented by the same molecular formula, say ${{C}_{3}}{{H}_{6}}O$. Write their structures and name them. State the relation between the two in the language of science.

How many nodes are present in 3-p orbitals? Represent diagrammatically.

What is the difference between epimers and anomers?

Write the mechanism of acid dehydration of ethanol to yield ethene.

What are the 9 isomers of Heptane?

Why is chloroform kept in dark coloured bottles?

Explain:i) Why do transition elements show variable oxidation state?ii) Give two differences between Lanthanide and Actinide.

What happens when egg-shell is added to nitric acid?

How to convert methanol into ethanol? Write chemical equations only.

How will you bring about the following conversions in not more than two steps?1. Propanone to Propene2. Benzoic acid to Benzaldehyde3. Ethanol to 3-Hydroxybutanal4. Benzene to m-Nitroacetophenone5. Benzaldehyde to Benzophenone6. Bromobenzene to 1-Phenylethanol7. Benzaldehyde to 3-Phenylpropan-1-ol8. Benzaldehyde to $\\alpha - $Hydroxyphenylacetic acid9. Benzoic acid to m-Nitrobenzyl alcohol

How will you convert the following?1.Nitrobenzene into aniline2.Ethanoic acid into methanamine3.Aniline into N-phenylethanamide(Write the chemical equations involved).

Explain with examples (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv)Isobars. Give any two uses of isotopes.

When a copper wire was left in a silver nitrate solution for some time, it was observed that the solution turned bluish green.i)Explain the observation.ii)Write the balanced equation to represent the change taking place

Give a chemical test to distinguish between ethane and ethene.

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