CBSE practice Questions

CBSE Class 12 Chemistry Sample Paper [PDF]

cbse class 12 chemistry

This practice CBSE class 12 chemistry question paper includes questions based on latest 12 CBSE Board Chemistry exam pattern.

1 MARK QUESTIONS

Question: Name the two components of starch.

Question: How many octahedral voids are there in one mole of a compound having ccp structure?

Question: What is an elementary reaction?

Question: Give the IUPAC name of CH3CH(CH3)CH2C(CH3)2COCH3

Question: Window glass of old building look milky, why?

Question: Write two advantage of fuel cell.

Question: Two liquids A and B on mixing produces warm solution. Which type of deviation from Raoult’s law does it show?

Question: Explain multi molecular colloids with the help of example.

Question: What is the covalence of  nitrogen in N2O5?

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Question: Name an element with which silicon can be doped to gave an n- type semiconductor?

Question: Haw much electricity is required in coulomb for the following oxidation 1 mole  to Mn2+?

Question: Define pseudo first order reaction with example.

Question: Define pyrometallurgy.

Question: Why a mercury cell gives constant voltage throughout its life?

Question: What is meant by term Broadspectrum antibiotic, Give example?

Question: What is the co-ordination number of hcp crystals ?

Question:  Which will be  adsorbed more readily on the charcoal surface and why : NH3 or CO2?

Question: What would be the value of Van,t Hoff factor for a dilute solution of K2SO4 in water?

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Question: (i) Out of (a) 200 ml of 2 M NaCl Soln and (b) 200 ml of 2 M glucose Soln. which one has higher osmotic pressure?

Question: Iodine form I3 but Fluorine does not form F3 why?

Question: What is the function of cryolite in the extraction of Aluminium?

Question: Express the relation between the half life period of a reaction of the nth order.

Question: Define Van’t Hoff factor?

Question: What is the role of graphite rod in the electrometallurgy of aluminium?

Question: How many effective sodium ions are located at the centres of the faces of a unit cell in sodium chloride crystal?

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Question: Arrange the following monoxides of transition metals on the basis of decreasing basic character TiO, VO, CrO, FeO.

Question: Write structure of the compounds whose IUPAC name is:- Cyclopent-3-en-1-ol

Question: Why Amine are more basic than comparable alcohols?

Question: Draw the structure of Pent-2-enal.

Question: Write the noble gas species that is iso-structural with BrO3.

Question: A galvanic cell is prepared, but there is no flow of current. What may be the reason?

Question: What is Hardy-Schulze rule?

Question: State Henry’s law.

Question: Ortho nitrophenol is more acidic than ortho methoxyphenol. Why?

Question: When proteins said to be denatured?

Question: Give the IUPAC name of  CH3NHCH(CH3)2.

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Question: How much electricity is required in coulomb for the following oxidation 1 mole Cr2O7 2- to Cr 3+?

Question: What do you observe when Red Blood corpuscles are placed in  (i) 1% NaCl Solution, (ii) 0.5% NaCl Solution?

Question: A plot of rate of reaction (y-axis) versus concentration of reaction (x-axis) gives a line parallel to x-axis. What is the order of the reaction?

Question: Write the formula for tetraamineaquachloridocobalt(III)chloride.

Question: Draw the structure of  Hex-2-en-4-ynoic acid.

Question: Write the structures of the monomer of the following polymer (1)Dactron (2)Buna-N

Question: Name a narcotic analgesic.

Question: What is fuel cell? Give one example.

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Question: Name the reagent which is used to convert phenol into picric acid.

Question: An element has a body centred cubic structure with a cell edge of 288 pm. The density of the element is 7.2 g/cc. How many atoms are present in 208 g of the element?

Question: Window glass of old building is thick at bottom, why?

Question: What happen when mango is placed in dilute aqueous soln. of HCl ?

2 MARK QUESTIONS

Question: Which colligative property is preferred for the molar mass determination of macro molecules? Why ?

Question: (i) With the help of structure write the basicity of H3PO3.
(ii) What happens when H3PO3 is heated?

Question: Atoms of element B form hcp lattice and those of element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

Question: Write condition for reverse osmosis and also write one application of it.

Question: Non- stoichiometric cuprous oxide Cu2O can be prepared in the laboratory. In this oxide, copper to oxide ratio is slightly less than 2:1 Can you account for the fact that this substance is a p- type semiconductor?

Question: (i) What is shape selective catalysis?
(ii) Give one example of water in oil emulsion.

Question: The conductivity of 0.20 M solution of KCl at 298K is 0.0248 S/cm.Calculate its molar conductivity.

Question: Write cell reactions of lead storage cell.

Question: Illustrate, elevation in boiling point with the help of vapour pressure – temperature curve of a solution. Show that elevation in boiling point is a colligative property.

Question: (i) An alkaline medium inhibits the rusting of iron. Why?
(ii) Define molar conductivity.

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Question: Distinguish between dettol and a 1% solution of phenol. Also name the antiseptic added in soaps.

Question: What are lyophilic & lyophobic colloids. Give one example of each.

Question: Why do the transition elements exhibit higher enthalpies of atomization?

Question: Draw the structure ofchromate and dichromate ions?

Question: In which of the following does adsorption take place and why?
(i) Silica gel placed in the atmosphere saturated with water.
(ii) Anhydrous CaCl2 placed in the atmosphere saturated with water.

Question: Write the mechanism of hydration of ethene to yield ethanol.

Question: If radius of octahedral void is r & of atom in close packing is R, derive relationship between r & R.

Question: Write cell reactions of Dry cell.

Question: (i) Out of (a) 200 ml of 2 M NaCl Soln and (b) 200 ml of 2 M glucose Soln. which one has higher osmotic pressure?
(ii) Define Mole fraction

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Question: Name the monomer from which Nylon – 6 is manufactured.

Question: Describe the principle involved in each of the following process:
(i) Refining of metal by liquation.
(ii) Concentration of ore by hydraulic washing.

Question: Write the principles of refining of metals by the following methods: (i) Zone refining (ii) Electrolytic refining

Question: (a) Distinguish between order and molecularity of a reaction.
(b) What is meant by pseudo first order reaction? Give an example of it.

Question: A mixed oxide of iron and chromium is fused with sodiumcarbonate in the presence of air to form a compound A, which on treatment with sulphuric acid gives an orange compound B. Write equations to show the conversions.

Question: (i) Out of 1 M urea & 1 M KCl which has high elevation in b.pt.
(ii) Define Molarity.

Question: Draw the structure of
(i) Pyrophosphoric acid
(ii)  peroxodisulphuric acid

Question: (i) Give the equations of reactions for the preparation of phenol from cumene.
(ii) There are two  -NH2 group in semicarbazide ,but only one is involved in the formation of semicarbazone.Why?

Question: A primary alkyl halide C4H9Br reacted with alcoholic KOH to give a compound A, this compound reacted with HBr to give B which is an isomer of the parent compound. Write the reaction for the conversion of A to B and the structures of the isomers.

Question: Arrange the following in order of the property indicated:
(i) F2 Cl2 BrI2  (increasing order of bond energy)
(ii) NH3  PH3 AsH3 SbH3 BiH3 (increasing order of bond angle)

Question: In the mineral spinal; having the formula MgAl2O4. The oxide ions are arranged in CCP, Mg2+ ions occupy the tetrahedral voids. While Al3+ ions occupy the octahedral voids.

Question: Explain the difference between Buna – N and Buna – S.

Question: Explain the following terms (i) Coagulation (ii) Dialysis

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Question: The resistance of a conductivity cell with 0.1 M KCl solution is 200 ohm. When the same cell is filled with a 0.02 M NaCl solution, the resistance is 1100 ohm. Given that the conductivity of 0.1 M KCl solution is 1.29 ohm-1 m-1. Calculate the conductivity of 0.02 M NaCl solution.

Question: Atoms of element B form hcp lattice and those of element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

Question: Draw figure to show the splitting of d-orbitals in an octahedral crystal field.

Question: What is meant by the rate constant? If the concentration is expressed in mol/l & time in seconds what would be the unit of rate constant first order reaction?

Question: Distinguish between:
(i) Hexagonal Close packing and cubic close packing.
(ii) Tetrahedral void and Octahedral void.

Question: A certain reaction is 50% complete in 20 minutes at 300 K and the same reaction is again 50% complete in 5 minutes at 350 K. Calculate the activation energy if it is a first order reaction.

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Question: Write short note on any two polyhalogen compounds.

Question: A reaction is first order in A & second order in B . How is the rate affected
(i) on increasing  the concentration of B three times.
(ii) when  the concentrations of both A & B three times.

Question: (i) What percentage of tetrahedral voids is occupied by Mg2+ ions?
(ii) What percentage of octahedral voids is occupied by Al3+ ions?

Question: A mixed oxide of iron and chromium is fused with sodiumcarbonate in the presence of air to form a compound A, which on treatment with sulphuric acid gives an orange compound B. Write equations to show the conversions.

Question: Define thermoplastics and thermosetting polymers with two examples of each.

Question: How will you bring about the following conversions:-
(i) Ethanol to 3-Hydroxybutanal
(ii) 3-Methylaniline to 3-nitrotoluene.
(iii) Ethyl magnesium chloride to  Propan-1-ol.

Question: Explain why:
(1) The dipole moment of chloroform is lower than that of cyclohexyl chloride?
(2) Grignard reagents should be prepared under anhydrous conditions?

3 MARK QUESTIONS

Question: Write the cell notation for a cell having magnesium anode and copper cathode. Also calculate the emf of this cell where concentration of magnesium ions is 0.001 M and copper ions is 0.0001 M. The standard emf of Mg is -2.36 V and Cu is 0.34 V.

Question: Arrange the following in order of the property as indicated:
(i) acetaldehyde, acetone, di tert.butyl ketone, methyl tert. butyl ketone (reactivity toward NH2OH )
(ii) The four isomeric bromo-butanes (reactivity for SN1 or SN2 reaction)
(iii) C2H5NH2 C6H5NHCH3 C6H5NH2 (C2H5)2NH (order of pkb value)

Question: (a) Give the mechanism in forming rusting of iron.
(b) Why molar conductivity of weak electrolyte at infinite dilution cannot be determined directly.
(c) What are the advantages of using fuel cell?

Question: Write the short notes on:- (i) Kolbe,s  reaction (ii) Cannizaro reaction (iii) Hell-Volhard Zelinsky reaction

Question: With the help of chemical equation, describe the following:
(i) Cannizzaro reaction
(ii) Williamson synthesis
(iii) Carbylamine reaction

Question: The resistance of a conductivity cell with 0.1 M KCl solution is 200 ohm. When the same cell is filled with a 0.02 M NaCl solution, the resistance is 1100 ohm. Given that the conductivity of 0.1 M KCl solution is 1.29 ohm-1 m-1 Calculate the cell constant and molar conductivity of 0.02 M NaCl solution.

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Question: Why do KCl and acetic acid show abnormal molar mass? What do we infer when Vant Hoff’s factor is unity.

Question: Account for the following:
(i) Aniline does not undergo Friedal-Crafts reaction
(ii) H2SO4 is not used during the reaction of alcohols with KI for iodo derivative preparation.
(iii) There are two –NH2 group in semicarbezide, only one is involved in the formation of semicarbazone

Question: What is Kraft temperature? Distinguish between lyophilic and lyophobic colloides with an example each.

Question: Explain the following: (a) Transition metals exhibit variable oxidation of states. (b) Chromium metal has high melting point. (c) Transition metals form coloured ions.

Question: What are food preservatives? Give one examples.

Question: Give a chemical test to distinguish between the following:
(i) acetophenone and benzophenone
(ii) aniline and methyl amine
(iii) Methanic acid and Ethanoic acid

Question: For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.

Question: Niobium crystallizes as bcc structure. If its density is 8.55 gm/cm3 Calculate the atomic radius of niobium (atomic mass of niobium = 93 u)

Question: Arrange the following in the order of property indicated for each set:
(i) F2, Cl2, Br2, I2 – increasing bond dissociation enthalpy.
(ii) HF, HCl, HBr, HI – increasing acid strength.
(iii) NH3, PH3, AsH3, SbH3, BiH3 − increasing basic strength.

Question: What happens when D-glucose is treated with: (a) HI, (b) Bromine water (c) Nitric acid.

Question: Two element A and B form compounds having formula AB2 and AB4 . When dissolved in 20 gm of benzene, 1 gm of AB2 lowers the freezing point by 2.3 K whereas 1 gm of AB4 lowers it by 1.3 K . Calculate atomic mass of A and B (Kf for benzene is 5.1 K Kg/mol)

Question: Write short note and reaction : Cannizaro reaction , Decarboxylation reaction.

Question: An aromatic compound A when reacts with NaOH form B which with CO2 at 450 K form C Compound C treated with HCl gives 2-hydroxy benzoic acid . Identify A,B and C , also write the chemical reaction involved.

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Question: (i) CaCl2 will introduce Schottky defect if added to AgCl crystal.Why?
(ii) In corundum, oxide ions are arranged in hexagonal close packing and Al ions occupy two-third of octahedral voids. What is the formula of corundum?

Question: Distinguish between: (a) Phenol and ethanol, (b) Propanol and 2-propanol (c) Why are phenols more acidic than alcohols?

Question: Answer the following:
(i) What happens when freshly prepared Fe(OH)3precipitate is shaken with dilute FeCl3 solution?
(ii) Alum is added to purify water with suspend impurities. Why?
(iii) What is observed when an emulsion is subjected to centrifugation?

Question: Explain: (a) There is a greater range of oxidation states among the actinoids than lanthanoids. (b) Atomic radii of second and third d- series elements almost same. (c) The highest oxidation state of a metal exhibited in its oxides or fluorides only.

Question: An aromatic compound ‘A’ on treatment with aqueous ammonia and heating forms compound ‘B’ which on heating with Br2 and KOH forms a compound ‘C’ of molecular formula C6H7N. Write the structures and IUPAC names of compounds A,B,&C.

Question: Give one chemical test to distinguish between the following pairs of compounds.
(i) Methylamine and dimethylamine
(ii) Acetophenone and Benzophenone
(iii) Phenol & Benzoic acid

Question: Define the following with relation to proteins: (a) Peptide linkage, (b) Primary structure (c) Denaturation.

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Question: (a) Write short note on Gabriel phtalimide synthesis. (b) Convert aniline to phenol. (c) Draw the structure of the zwitter ion of sulphanilic acid.

Question: Answer the following:
(i) Why is FeCl3 preferred over KCl in case of a cut leading to bleeding?
(ii) Write a chemical equation showing the preparation of a positive sol.
(iii) How does BF3 act as a catalyst in industrial process ?

Question: A Daniell Cell producer a current of 3.5 mA at 1.1 v for 15 min. What is the maximum possible work you can get from it?

Question: Resistance of a conductivity cell filled with 0.1 M KCl solution is 100 ohm. If the resistance of same cell when filled with 0.02 M KCl is 520 ohm. Calculate cell constant, conductivity and molar conductivity of 0.02 M KCl solution. The conductivity of 0.1 M KCl solution is 1.29 S/m

5 MARK QUESTIONS

Question: (a) Show that for a zero order reaction, half life is directly proportional to the initial concentration of the reactant, but in a first order reaction, the half life of the reaction is independent of the initial concentration of reactant. (b) A first order reaction has a rate constant of 0.00115/s.How long will 5 g of this reactant take to reduce to 3 g?

Question: (a) Explain the following :
(i) order of reaction
(ii) molecularity of reaction
(b) The rate of a reaction increases four times when temperature changes from 300 K to 320 K. Calculate the activation energy of reaction.

Question: (i) What is responsible to conduct electricity in Metalic Solids?
(ii) What are 12-16 group compounds?
(iii) An element has bcc structure with cell edge 288 pm, density is 7.2 gm/cm3. How many atoms present in 208 g of the element.

Question: (a) Convert carbondioxide to acetic acid. (b) Convert butanal to butanoic acid. (c) Convert ethylbenzene to benzoic acid. (d) Draw the structure of 4-Chloropentan-2-one. (e) Give the product obtained when benzoic acid is treated with conc.sulphuric acid and conc.nitric acid (Nitrating Mixture).

Question: Give reasons:-
(a) (i) N2 is inert at room temperature
(ii) ICl is more reactive than I2
(iii) Although electron gain enthalpy of F is less negative as compared to Cl. F is a stronger  oxidizing agent than Cl. Why?
(b) Describe the manufacture of H2SO4 by contact process.

Question: Give reason for the following:
(i) Bond angle of PH4+ is higher than PH3 .
(ii) H3PO3 acts as reducing agent.
(iii) SO2 may act as oxidizing as well as reducing agent.
(iv) ICl is more reactive than I2
(v) Fluorine form only one oxo-acid, HOF.

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Question: Give the answer of following:  (1) What is meant by disproportionation  of an oxidation state . Give example. (2) K2PtCl6 is well known compound whereas coorsponding Ni compound is not known why? (3) indicate the steps the preparation of K2Cr2O7  from chromite ore? (4) Explain why transistion element show variable oxidation state and write possible oxidation state  shown by Mn?

Question: (i) What is responsible to conduct electricity in ionic solids?
(ii) What are 13-15 group compounds?
(iii) An element crystallises in hcp structure. 200 g of it has 4.121024 atoms, density is 7.2 g/cm3. Calculate the edge length of the unit cell.

Question: Give reasons:-
(a) (i) Fluorine forms only one oxoacid, HOF.
(ii) Noble gases have very low boiling points.
(iii) In solid state PCl5 behaves as an ionic species.
(b) How is ammonia manufactured by Haber,s process?  Mention the conditions required to maximize the yield of ammonia.

Question: (i) A 0.01 m aq sol of K3(Fe(CN)6) freezes at -0.062oC. What is the apparent % of dissociation? (Kf =1.86 K Kg/ mol)
(ii) Why is the vapour pressure of a solution of glucose in water lower than that of water?
(iii) What is the Van’t Hoff factor for a compound undergoes dimerisation?

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Question: (a) Aldehydes are generally more reactive than ketones in nucleophilic addition reactions. Why? (b) What is Aldol condensation? Explain with example. (c) Explain Cannizzaro’s reaction.

Question: (a) Convert carbondioxide to acetic acid. (b) Convert butanal to butanoic acid. (c) Convert ethylbenzene to benzoic acid. (d) Draw the structure of 4-Chloropentan-2-one. (e) Give the product obtained when benzoic acid is treated with conc.sulphuric acid and conc.nitric acid(Nitrating Mixture).

Question: (a) Give  reasons:-
(i) Aniline does not undergo Friedel Crafts reaction.
(ii) Carboxylic acid is a stronger acid than phenol.
(iii) The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in the presence of alcoholic KOH, alkenes are major products.
(b) Arrange in  increasing order of property indicated :
(i) CH3F, CH3I, CH3Cl, CH3Br (nucleophilic substitution)
(ii) Benzoic acid, 4-Nitrobenzoic acid, 3, 4-dinitrobenzoic acid, 4-methoxy benzoic acid. (acidic strength)

Question: (i) R3P=O exit but R3N=O does not .
(ii) SCl6 is not known but SF6 is known.
(iii) PCl5 in solid state is ionic.
(iv) Sulpher in vapour state is paramagnetic.
(v) Nitrogen does not form pentahalide.

Question: (a) Explain how rusting of iron is envisaged as setting up of an electro-chemical cell.
(b) Zn rod dipped in 0.1 M solution of ZnSO4. The salt 95 % dissociated. Calculate the electrode potential   (E0 Zn 2+ /Zn  = – 0.76 V.)

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Question: (a) State Raoult’s law for solutions containing a non volatile solute. (b) Sodium chloride or calcium chloride is used to clear snow from the roads. Why? (c) 0.5 g of KCl was dissolved in 100 g water and the solution originally at 200C, froze at –0.240C. Calculate the percentage ionization of salt. Kf per 1000 g of water = 1.86 K.

Question: (i) Explain a) abnormal molar mass, (b) azeotropic mixture. (c) negative deviation from Rault,s law. (ii) What are the factors responsible for the solubility of gases in liquid?

Question: (a) Write the mechanism of dehydration of ethanol by H2SO4 at 443 K.
(b) Write chemical equation for the following conversion:
(i) benzaldehyde to acetophenone
(ii) n-propyl amine to ethyl amine
(iii) 1-butene to 1-iodo- butane

Question: (a) Ammonia forms hydrogen bonds but not phosphene. Why? (b) What led Bartlet to carry out reaction between xenon and platinumhexafluoride?
(c) Why are halogens coloured? d) Draw the structure of xenondifluoride and give the equation for its preparation.

Question: (a) (i) A solution of ethanol and cyclohexane show +ve deviation from Raoult’s law.Why?
(ii) What happens if the pressure greater than osmotic pressure is applied on the solution. The solvent and solution are separated by SPM ?
(b) X g of a non-electrolyte compound (molar mass = 200) are dissolved in 1.0 litre of 0.05 M NaCl aqueous solution. The osmotic pressure of this solution is found to be 4.92 atm at 27oC. Calculate the value of X. assume complsete dissociation of NaCl (R = 0.082 litre atm mol-1 K-1)(Atomic mass Na = 23,Cl = 35.5)

Question: (a) What is the basicity of orthophosphoric acid? (b) The covalency of oxygen is limited to four. Why? (c) Draw the structure of pyrosulphuric acid. (d) Noble gases have very low boiling points. Why? (e) Write a balanced equation for the reaction between xenonhexafluoride and water.

Question: (a) Aldehydes are generally more reactive than ketones in nucleophilic addition reactions. Why? (b) What is Aldol condensation? Explain with example. (c) Explain Cannizzaro’s reaction.

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Question: (a) Ammonia forms hydrogen bonds but not phosphene. Why? (b) What led Bartlet to carry out reaction between xenon and platinumhexafluoride? (c) Why are halogens coloured? (d) Draw the structure of xenondifluoride and give the equation for its preparation.

Question: (a) Give reasons:-
(i) Aldehydes are more reactive than ketones.
(ii) pkb of aniline is more than that of methyl amine.
(iii) R—Cl is hydrolysed to R—OH slowly but the reaction is rapid if a catalytic amount of KI is added to the reaction mixture.
(b) Arrange in  increasing order of property indicated: (i) Benzaldehyde. p-nitrobenzaldehyde, Acetophenone (Reactivity towards HCN)
(ii) (CH3) 3N, (CH3)2NH, CH3NH3, NH3 (basic strength in aq. medium)

Question: (a) The rate constants of a reaction at 500 K and 700 K are 0.02/s and 0.07/s respectively. Calculate activation energy. (R=8.314 J/K/mol) (b) A reaction is first order in A and second order in B.Write the rate law expression and how will the rate be affected if concentration of B is increased three times?

Question: (i) Describe how for weak & strong electrolytes, Molar conductivity changes with concentration of solute.
(ii) Calculate the potential of the following cell
Sn+4 (1.5 M) + Zn → Sn 2+  (0.5 M) + Zn2+  (2 M)
Given   E0 Sn+4/ Sn2+ = 0.13 V. E0 (Zn 2+/ Zn) = – 0.76 V.

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Question: (a) (i) Ethylene glycol is added in the aqueous solution of car radiators in hills. Why?
(ii) Under identical conditions of molar concentration, what is the decreasing order of the colligative properties of the aqueous solutions of urea, NaCl, BaCl2 and Na3PO4
(b) Heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two  liquid components are 105.2 kPa and 46.8 kPa respectively. What will be the vapour pressure of a mixture of 26.0 g of heptane and 35 g of octane? (Atomic mass  C=12,H=1)

Question: (a) Write the mechanism of aldol condensation
(b) Write chemical equation for the following conversion:
(i) aniline to 1,3,5-tri-bromobenzene
(ii) ethyl alcohol to n-propyl alcohol
(iii) nitro-benzene to benzoic acid

Download all 30 questions using link below

Paper 1: https://examsegg.com/downloads/12/cbse-sample-paper-chemistry-class-12.pdf

Paper 2: https://examsegg.com/downloads/12/cbse-sample-paper-chemistry-2014.pdf

Paper 3: https://examsegg.com/downloads/12/cbse-class-12-sample-paper-chemistry.pdf

Paper 4: https://examsegg.com/downloads/12/cbse-12-sample-paper-chemistry.pdf

Paper 5: https://examsegg.com/downloads/12/cbse-chemistry-class-12-practice-paper.pdf

Paper 6: https://examsegg.com/downloads/12/cbse-12-sample-paper-of-chemistry.pdf

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