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  NARAYANA One Year Phase Test BATCH: SCCP 4501  for IIT-JEE, 2005 PHASE - I CHEMISTRY Code: OYPTC – 02 Time: 2 Hours Maximum Marks: 60Note: i)Attempt  all questions.ii) Separate answers are to be given on the separate pages.iii)Use of logarithmic table is NOT PERMITTED .iv)Use of calculator is   NOT PERMITTED . Useful Data:Gas Constant R =8.314 J K − 1  mol − 1 = 0.0821 Lit atm K − 1 mol − 1  =1.987 ≈  2 Cal K − 1 mol − 1  Avogadro's Number N a =6.023 ×  10 23 Planck’s constant h =6.625 ×  10 − 34  J ⋅  s = 6.625 ×  10  –27  erg ⋅  s 1 Faraday =96500 Coulomb 1 calorie =4.2 Joule 1 amu = 1.66 ×  10  –27 kg 1 eV= 1.6 ×  10  –19  J  Atomic No: H = 1, D = 1, Li = 3, Na = 11, K = 19, Rb = 37, Cs = 55, F = 19, Ca = 20, He = 2, O = 8, Au = 79, Ni = 28  Atomic Masses: He = 4, Mg = 24, C = 12, O = 16, N = 14, P = 31, Br = 80, Cu = 63.5, Fe = 56, Mn = 55, Pb = 207, Au = 197,  Ag = 108, F = 19, H = 2, Cl = 35.5, Sn = 118.6, Na = 23 Name of the Candidate:   Batch Number :  ᄃ NARAYANA IIT ACADEMY South Delhi Centre: 47B, Kalu Sarai, New Delhi - 110 016. Ph.: 51828300/01/02, 30946351 West Delhi Centre: 2/40, A!a e#$ %e#$ral &ar'e$, (e)$ Pu#!a*i Ba+h, New Delhi - 110 026. Ph.: 55479790, 30946351 SECTION – A 1.Two substance A and B are present to the extent that the concentration of A is four times thanthat of B. If half life of A is 5 min and that of B is 15 min. Find the time when A and B willhave the same concentration. 2.The initial pressure of cyclopropane ! # $ % in a 5&& cc vessel was '&2.$ mm #( at 5&& ).!alculate the concentration of cyclopropane that remained after '2& sec.* if the specificreaction rate constant for its isomeri+ation was 5.,5 - 1& /  sec 1 . .0hen 1 !# !# is reacted with 1  3a# solution at 254* then what is the p# of thesolution /.A teacher enters a classroom from front door while student from bac6 door. There are 1 e7uidistant rows of benches in the classroom. The teacher releases 3 2  from the front whilethe student releases the weepin( (as ! $ # 1& Br% from the last bench. At which row will thestudent start lau(hin( and weepin( simultaneously 5.If the value of activation ener(y is decreased by 2& )cal at 2,8 6* then what will be the effecton the e7uilibrium constant $.The vander 0aal9s constant for (ases 3 2 *  2 *   and #e are / 2 5 51&*/1&*21&and/1& − − − − × × × ×  in dm  per mole respectively* then arran(e these (ases inincreasin( order of their compressibility.'.0hat will be the effect on the e7uilibrium constant for the exothermic reaction on increasin(the temperature NARAYANA IIT ACADEMY South Delhi Centre: /'B* )alu :arai* 3ew ;elhi  11& &1$. <h.= 51828 &&>&1>&2* &,/$ 51 West Delhi Centre: 2>/&* Ad?acent !entral ar6et* 0est <un?abi Ba(h* 3ew ;elhi  11& &2$. <h.= 55/',',&* &,/$ 51 OYPT-Ph-I-CH-2 12  8.For the followin( parallel chain reaction* 12  1& s − − Κ = 2 11  1& s − − Κ = A/B5! then find out the overall halflife of A.,.&.$ 5( of a cupric salt is dissolved in water and excess of )I is added in the solution and theliberated iodine re7uires 2 2 25ml3a:5    ÷    where it converts into  2/ $ : − . 0hat is the @ of copper in the salt1&. .1$ ( of )n /  is completely reactin( with 5$ ml # 2  2  in acidic medium* then what is the volume stren(th of # 2  2   SECTION – B 11.The e7uilibrium constant )   p  for the reaction  3 2  # 2 ˆ ˆ†‡ ˆˆ   23# is 1.$/ ×  1&  /  at /&& & ! and 1.// ×  1&  /  at 5&& & !. !alculate the heat of formation of 3#  inthis temperature ran(e. Clo( &.&8'8 D   1.&5$E12. A solution was prepared by mixin( 2&& m of &.125  propionic acid with 1&& m of &.25 )#. 0hat was the p# of the solution   )  a  D 1. / - 1&  5  %. Clo( /. D &.$ /E NARAYANA IIT ACADEMY South Delhi Centre: /'B* )alu :arai* 3ew ;elhi  11& &1$. <h.= 51828 &&>&1>&2* &,/$ 51 West Delhi Centre: 2>/&* Ad?acent !entral ar6et* 0est <un?abi Ba(h* 3ew ;elhi  11& &2$. <h.= 55/',',&* &,/$ 51 OYPT-Ph-I-CH-3  1 .A 1 st  order reaction is 5&@ complete in & min at 2' & ! and in 1& min at /' & !. !alculate the i% Gate constant for reaction at 2' & ! and /' & !. ii% Hner(y of activation for the reaction. iii% Hner(y of activation for the reverse reaction if heat of reaction is  5& ) mol  1  Clo( D &./''1E1/. A solution of wea6 acid was titrated with base 3a#. The e7uivalence point was reachedwhen $.12 m of &.1 3a# have been added. 3ow 18.&$ m of &.1  #!l were added totitrated solution* the p# was found to be /.,2. 0hat is )  a  of acid Cantilo( /.,2%D1.2 × 1&  5 E15.A mixture of # 2 ! 2  /  and 3a#! 2  /  with impurities wei(hin( 2.82 (m was dissolved in water and the solution made upto 1. 1& m of this solution re7uired .& m of &.13 3a#solution for complete neutrali+ation* and 1& m of same solution in hot dil. # 2 : /  mediumre7uired / m of &.&2  )n /  for complete neutrali+ation. !alculate the amount of # 2 ! 2  /  and 3a#! 2  /  in the mixture.1$.25 m of a mixture of 3a#  3a 2 !  when titrated with  3#!l1& usin( phenolphthaleinindicator re7uired 25 ml #!l to 1 st  end point. At this sta(e methyl oran(e was added andaddition of acid was continued. The IInd end point was reached after further addition of 5 mof the acid. !alculate the amount of 3a 2 !  and 3a# in one litre of the solution1'.0hat amount of activation ener(y in 6cal% is needed for 1&   @ molecule to cross over theactivation barrier at 2'4!18.H7ual moles of A 2 (% and B 2 (% are introduced into a sealed container and heated to certaintemperature where followin( e7uilibria was established=i%A 2 (%  B 2 (% ˆ ˆ†‡ ˆˆ 2AB(%*6   p  D 2 NARAYANA IIT ACADEMY South Delhi Centre: /'B* )alu :arai* 3ew ;elhi  11& &1$. <h.= 51828 &&>&1>&2* &,/$ 51 West Delhi Centre: 2>/&* Ad?acent !entral ar6et* 0est <un?abi Ba(h* 3ew ;elhi  11& &2$. <h.= 55/',',&* &,/$ 51 OYPT-Ph-I-CH-4

Apr May 2010

Jul 23, 2017
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