* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Solved Guess Paper – 3 Q1. Define the term molarity . Ans
Asymmetric induction wikipedia , lookup
Acid dissociation constant wikipedia , lookup
Chemical equilibrium wikipedia , lookup
Inorganic chemistry wikipedia , lookup
Nuclear chemistry wikipedia , lookup
Chemical thermodynamics wikipedia , lookup
Green chemistry wikipedia , lookup
Marcus theory wikipedia , lookup
Biochemistry wikipedia , lookup
Electrolysis of water wikipedia , lookup
Nucleophilic acyl substitution wikipedia , lookup
Rate equation wikipedia , lookup
Hydrogen-bond catalysis wikipedia , lookup
Hydroformylation wikipedia , lookup
George S. Hammond wikipedia , lookup
Biosynthesis wikipedia , lookup
Acid–base reaction wikipedia , lookup
Photoredox catalysis wikipedia , lookup
Transition state theory wikipedia , lookup
Process chemistry wikipedia , lookup
Electrochemistry wikipedia , lookup
Metalloprotein wikipedia , lookup
Physical organic chemistry wikipedia , lookup
Chemical reaction wikipedia , lookup
Hofmann–Löffler reaction wikipedia , lookup
Stoichiometry wikipedia , lookup
Petasis reaction wikipedia , lookup
Photosynthetic reaction centre wikipedia , lookup
Strychnine total synthesis wikipedia , lookup
Lewis acid catalysis wikipedia , lookup
2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com Solved Guess Paper – 3 Q1. Define the term molarity . Ans- Molarity is defined as the number of moles of the solute per kilogram of the solvent . Q2. What is the Van’t Haff factor for potassium sulphate in very dilute aqeow solution . Ans- Tha van’t haff factor for potassium is 3 . Q3. Mention the concentration of H+ ions in the solution used in SHE . Ans- 1M or 1 molar concentration of H+ ions in the solution used in SHE . Q4. The unit of rate constant of a reaction is mol-1Ls-1 . What is the order of the reaction . Ans- Second order reaction since the unit of rate constant is mol-1Ls-1 . Q5. Among Al2(SO4)3 and (NH4)3PO4 which is better coagulating agent for a negative sol. Ans- Al2(SO4)3 is the coagulating agent for the negatine sol because Al3+ is more effective than NH4+ . Q6- Name the reducing agent used in the extraction of Zinc from zinc oxide Ans- Coke (carbon) is the reducing agent used in the extraction of zinc from zinc oxide . 7. Name the main commercial source of helium ? Ans- Natural gas is the main source of helium . 8. R X NaI R I NaX. The reaction is known as ....... Ans- Finkelsten reaction . 9. Give reasons ; hydrogen atoms of aldehyde and ketones are acidic ? Ans- Hydrogen atoms of aldehyde and ketons are acidic due to the strong electron withdracing effect of the carbonyle group and reasonance stabilisation of conjugate base . India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com 10. What are non- essential amino acids ? Ans- The amino acids which can be synthesised in the body are known as nonessential amino acids . PART – B 11 a. Mention one consequence of metal excess defect . b. Give an example for molecular solid . Ans- a. Metal excess defect is due to anionic vacancies and extra contains at interstitial site . The anionic sites are occupied by unpaired electrons are called F- centres which imparts colour to the crystal . b. H2, Cl2 , solid SO2 , Solid NH3 etc are the example for molecular solid . 12. Write the symbolic representation of standard hydrogen electrode (SHE) and give its standard potential value . Ans- The symbolic representation of standard hydrogen electrode is Pt(s)/H 2 (g, l bar) | H+ (aq. 1M) The standard electrode potential of SHE is OV . 13. Drive the example for half- life of zero order reaction . Ans- Half- life of zero- order reaction . The integral rate equation for zero order reaction is [R] kt [R]0 ....(1) If t t1/ 2 , [R] [R]0 2 Substituting in eqn. (1) [R]0 kt1/ 2 [R]0 2 kt1/ 2 [R]0 kt1/ 2 [R]0 2 2[R]0 [R]0 2 India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry kt1/ 2 Solved Guess Paper - 3 www.SimpleLecture.com [R]0 2k [R]0 t1/ 2 2k Half- life period of zero order reaction is directly proportional to initial concentration . 14. Give an example for heteroleptic complex . Ans- when more than one type of ligands are present , then the complex is called as hetroleptic complex . Ex :[Pt(NH3 )2 Cl 2 ];[CO(NH3 )4 Cl(NO2 )] ,[CoCl 2 (CN)2 ] etc. 15. A carbonyl compound (p) with the formula C2H4O reacts with CH3MgX followed by hydrolysis to form an alcohol (Q). Name the alcohol . Write the chemical equation of the reaction . Ans- The product obtained is proponol . H H O/ H | 2 CH 3 C O CH 3MgX CH 3 C_ OMgX CH 3 CH 2 CH 2 OH CH 3 H | X Mg OH 16. write the chemical equation for the reaction b/w dilute NaOH and acetaldehyde , mention in the name of the product formed . Ans – The chemical equation is : β α dil.NaOH 2CH 3CHO CH 3 CH CH 2 CHO CH 3 CH CH CHO H 2O | OH 17. What are food preservatives ? Give one example . Ans- Food preservations ; The substances that is added to food to prevent spilage due to microbial growth . Ex.- Sodium chloride , Sodium benzoate India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com 18. What are artificial are the chemicals that sweeten food and does not add colories to our body . Ex – Saccharin , Sucrolose , Alitame PART – C 19. On the basis of Ellingham’s diagram explain the principle of extraction iron from its iron oxide . Ans- Extraction of iron from iron oxide are The reduction of iron oxide to iron is explained using ellingham’s diagram . The reduction of Fe2O3 to F2O taking place and in the other , e is being oxidized to CO . 1 FeO(s) Fe(s) O2 (g) G (feO,fe) 2 1 C(s) O2 (s) CO G[C3CO) 2 When both the reaction takes place to yield the net libbs free energy change becomes G(C,CO) G(feo,fe) rG The reactions takes places when the above reaction is negative . In G 0 is T plot representing reactions . If the plot goes upward which represents the change C CO (C,CO) goes downward . At temperature above 1073k the C, Co line comes below fe, feo line so in this range coke will be reducing the FeO and will itself oxide to CO . FeO C Fe CO 20 . Draw the flow chart for the manufacture of sulphuric acid by contact process . Give one example of interhalogen compounds . Ans- Flow chart for the manufacturing of sulphuric acid . Dust Tyndall SO2 O2 Drier S O2 chamber box India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com Fu min g catalytic SO3 absorption SO2 chamber chamber H S O 2 2 7 b). Example for interhalogen compounds are ClF, ClF3 , Icl , etc. 21. How does phosphorous reacts with limited amount of chlorine ? Give equation . Write the structure of sulphurous acid . Ans- Phosphorous reacts with limited amount of chlorine to form phosphorous trichloride . 2P4 12cl 2 8Pcl 3 Structure of sulphurous acid [H2SO3] HO S| O OH 22. Complete the reaction . (a). SO3 conc.H2SO4 ? Mno ? (b). 2KclO3 2 ? ? (c). Zn dilute HNO3 Sol.- (a). SO3 conc.H2SO4 H2S2O7 MnO 2Kcl 3O2 (b). 2KclO3 2 (c). Zn dilute HNO3 Zn(NO3 )2 3O2 23. write ionic equation for the reaction of dichromate ions with i). Hydroxide ions ii). Fe 2+ ions in acidic medium . In which one of the above two reactions will the oxidation number of chromium remains unchanged ? Ans- K 2Cr2O7 2KOH 2K 2Cr2O4 H2O (ii). K 2Cr2O7 7H2SO4 6FeSO4 K 2SO4 Cr2 (SO4 )3 3Fe2 (SO4 )3 7H2O India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com In the reaction of dichromate ions with hydroxyl the O, N of chromium remains unchanged . 24. Give reasons (a). Most of the transition metals have high melting point and boiling point . b). 2nd ionization enthalpy of Cu is exceptionally high . 25(a). Calculate the packing efficiency in a Fcc/HCP/CCP (b). What is ferromagnetism ? Give an example for ferromagnetic substance . Ans (a). Packing efficiency of FCC Edge length = a Face diagonal = b In ABC AC2 AB 2 BC2 b2 a2 a2 b 2 2a 2 b 2a In ‘r’ is the radius of the sphere b 4r 2a a 2 2r India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com Volume of the sphere , v a5 (2 2r)5 Packing efficiency of FCC volumeoccupiedby 4sphere 100 total volumeof thesphere 4 4 πr 3 3 100 (2 2π)3 = 74% (b). Ferromagnetism are strongly attracted by the magnetic field . They acts as permanent magnets . Ex: Iron, Cobalt , nickel 26(a). A 4% solution of a non – volatile solute is isotonic with 0.72% urea solution . Calculate the molar mass of the non- volatile solute . (Molar mass of urea = bog mol-1) (b). Plot a graph of vapour pressure against mole fraction of the two volatile liquids forming an ideal solution / non- ideal solution with +ve derivation / non ideal solution with negative derivation . (a). For isotonic solution w1 w 2 M1 M 2 Where w1 = 0.702g , w2 = 4g, M1 = 60 M2 M2 w 2 M1 w1 40 60 341.8g mol 1 7.02 (b). Volutile liquids formingideal solution . India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Position deviation : Solved Guess Paper - 3 www.SimpleLecture.com Negative deviation : 27 a. Write the reaction taking place at anode and cathode during corrosion of iron . b. Write the anodic and cathodic half –cell reactions taking place in Daniel cell . Ans- a). Corrosion of iron . At cathode India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com 2Fe 2Fe2 4e It occurs in the presence of water and air at a particular spot of iron called anode . At cathode : O2 4H 4e 2H2O Electron moves from anodic spot through the metal and goto the another spot on the metal and reduce oxygen in the presence of H+ . This spot behaves as cathode . b). Half cell reaction At anode Zn(s) Zn2 (aq) 2e At cathode cu2 2e cu 28 a. Show that for first order reaction t87.5% = t30% b). The rate of a reaction increases by 4 times when the temperature of the reaction is raised from 340k to 360k . Calculate the energy of activation of the reaction . Given R = 8.314 J/k/mol Ans- (a). Expression for k when 87.5% of reactant is reacted . k 2.303 100 log t 87.5% 12.5 k 2.303 log 8 t 87.5% k 2.303 0.9031 ....(1) t 87.5 k [R]0 2.303 log t [R] [R]0 100 [R] = 100 – 87.5 = 12.5 Expression for k when 50% of reactant is reacted . [R]0 = 100 , t = t50% India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com [R] = 100 – 50 = 50 k 2.303 100 log t 50% 50 k 2.303 log 2 t 50% k 2.303 0.3010 ....(2) t 50% Divides eqn. (1) by (2) 2.303 0.9031 t 87.5% 2.303 k 0.3010 t 50% k t t 50% 0.9031 t 87.3% 0.3010 t 87.5% t 50% 3 t 87.5% 3t 50% (b). Given T1 = 340k , Ea = ? T2 = 360k K=4 log Ea T2 T1 k1 k 2 2.303R T1T2 log 4 Ea 360 340 2.303 8.314 360 340 India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com Ea 360 340 log 4 2.303 8.314 360 340 Ea 20 0.6021 19.147142 122400 0.0001634 Ea 0.6021 19.147142 0.6021 19.147142 0.0001634 11.5285 Ea 0.0001634 Ea 70554J (or) 70.554KJ Ea 29(a). What are the effect of the electron with drawing and electron donating groups on acidity of carboxylic acid . b. How does ketone react with ethylene alchole . Write chemical equation for the reaction . Ans- (a). Effect of electron with drawing group on carboxylic acid . Electron withdrawing group increases acidity of carboxylic acid by conjugate base through resonance or inductive effect . Ex: ClEffect of electron donating group on carboxylic acid electron donating group decrease the acidity of conjugate base . Ex.- CH3 is electron donating group . 30 a. Explain Halff mann bromamide reaction with . b). Ketones reacts with ethylene glycol in the presence of HCl to form ethylene glycol ketal . R R R O CH C O CH 2OH R C OCH22 H 2O HCl | CH2OH 31a. Explain Hoffmann bromamide reaction with an example . b. Carbyl amine reaction by taking methyl amine as an example . c. Explain helium reduction with an equation . India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com Ans- a. When an amide is heated with a mixture of bromine and sodium hydroxide , primary amines are formed . This reaction is called as Hoffmann degradation or Hoffmann bromomide reaction . O || Ex : CH 3 C NH 2 Br2 4NaOH H 3C NH 2 Na 2CO3 2NaBr 2H 2O b). Carbylamine reaction : when methyl amine is heated with chloroform and alcoholic potassium hydroxide solution . It gives methyl isocyanide . alcoholic CH3 NC 3KCl H2O Ex:- CH3NH2 CHCl 2 3KOH c). Mendior reaction [Reduction of nitride] The reaction of nitrile using Na in Hg in ethanol gives primary amine called Mendeur’s reaction . NainHg/C H OH R CH2 NH2 Ex.- RCN 2 5 NainHg/C2 H5OH CH3 CN CH3 CH2 NH2 32. What is (i). Tyndall effect (ii). Peptisation (b). Mention two factors which effects adsorption of a gas on a solid . (c). What do you mean by selectivity of a catalyst . Ans- (a). i. The phenomenon of scattering of light by the colloidal particles is called as tyndall effect . 33. Factor affecting absorption of a gas on a sold . Nature of a gas (adsorbate) Nature of the solid (adsorbate) Pressure of the gas Surface area of the solid India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com (c). The ability of catalyst to direct the reaction to produce a particular product in greater yield is called selectivity . 34.a. What is Zuter ion of an amino acid ? Give its general formula b. What are difference b/w DNA and RNA c. Mention the diffenciency of vitamin c Sol.- a. In solution the carbonyl group can be loose a proton and amino group can accept a proton giving rise to the dipolar ion known as Zwitter ion . (b). DNA RNA 1, DNA has double strand helix (i). RNA has a single strand helix structure . structure . (ii). DNA is responsible for identity of (ii). RNA is responsible for the different species , chemical base for synthesis of protein in cell . heredity . (iii). DNA is composed of B-D-2 (iii). RNA is composed B-D- ribosugar dexoyribosugar phosphoric acid and , phosphoric and nitrogen containing nitrogen containing heterocyclic hetrocyclic component . component . c. Deficiency of vitamin c leads to survey (bleeding gums). 37. a. What is vulcanization of rubber . India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses ) 2nd PUC Chemistry Solved Guess Paper - 3 www.SimpleLecture.com b. How is Buna – N prepared. Write its equation . c. Give the lUPAC name of the monomer of natural rubber . Ans- Vuleanization of rubber means heating a mixture of raw rubber with sulphuric acid at a temperature tange b/w 373k – 415k . Thus the rubber gets solvent soft to the stiffin [hand]. b. Buna –N is obtained by w-polymerisation of 1,3 buta –dine airylonite in the presence of periodic catalyst . c. The iUPAC name of isoprene is . 2- methyl -1, 3 –Buta diene . India’s Leadings smart learning campus for 10th 11th 12th , IIT ,AIEEE, AIPMT ( All Engineering and Medical Entrance courses )