MATHEMATICS-24-12- 11th (PQRS) Code-A WA

REVIEW TEST-7/6 Class : XI (P,Q,R,S & J) PAPER CODE : A Time : 2 hour Max. Marks : 130 INSTRUCTIONS 1. The question paper contains 12 pages and 3-parts. Part-A contains 20 objective questions, Part-B contains 3 "Match the Column" questions and Part-C contains 4 "Subjective" questions. All questions are compulsory. Please ensure that the Question Paper you have received contains all the QUESTIONS and Pages. If you found some mistake like missing questions or pages then contact immediately to the Invigilator. PART-A (i) Q.1 to Q.15 have only one correct alternative and carry 3 marks each. There is NEGATIVE marking and 1 mark will be deducted for each wrong answer. (ii) Q.16 to Q.20 have one or more than one correct alternative(s) and carry 5 marks each. There is NO NEGATIVE marking. Marks will be awarded only if all the correct alternatives are selected. PART-B (iii) Q.1 to Q.3 are "Match the Column" type which may have one or more than one matching options and carry 8 marks for each question. 2 marks will be awarded for each correct match within a question. There is NEGATIVE marking. 0.5 Marks will be deducted for each wrong match. Marks will be awarded only if all the correct alternative(s) is/are selected. PART-C (iv) Q.1 to Q.4 are "Subjective" questions and carry 9 marks each. There is NO NEGATIVE marking. Marks will be awarded only if all the correct bubbles are filled in your OMR answer sheet. 2. Indicate the correct answer for each question by filling appropriate bubble in your OMR answer sheet. 3. Use only HB pencil for darkening the bubble. 4. Use of Calculator, Log Table, Slide Rule and Mobile is not allowed. 5. The answer(s) of the questions must be marked by shading the circles against the question by dark HB pencil only. PART-B For example if correct match for (A) is P, Q; for (B) is P, R; for (C) is P and for (D) is S then the correct method for filling the bubbles is P Q R S (A) (B) (C) (D) PART-C Ensure that all columns (4 before decimal and 2 after decimal) are filled. Answer having blank column will be treated as incorrect. Insert leading zero(s) if required after rounding the result to 2 decimal places. e.g. 86 should be filled as 0086.00 USEFUL DATA Atomic weights: Al = 27, Mg = 24, Cu = 63.5, Mn = 55, Cl = 35.5, O = 16, H = 1, P = 31, Ag = 108, N = 14, Li = 7, I = 127, Cr = 52, K=39, S = 32, Na = 23, C = 12, Br = 80, Fe = 56, Ca = 40, Zn = 65.4, Pt = 195, Useful constant : g = 9.8 m/sec2, h = 6.626 × 10–34 Js PART-A Select the correct alternative. (Only one is correct) [15 × 3 = 45] There is NEGATIVE marking and 1 mark will be deducted for each wrong answer. Q.1 Choose the only incorrect statement (A) K.E of photo electron does not depend upon wavelength of incident radiation and its value ranges from zero to KEmax (B) Photoelectric current depends on intensity of incident radiation and not on frequencywhereas stopping potential depends on frequency of radiation & not on intensity. (C) If the accelerating potential V eV is applied on photo electron in discharge tube, then the value of KE of photo electrons vary from V eV to (a–b+V) eV where a & b are energy of incident radiation and work function in eV respectively with a > b. (D) None of these Q.2 Statement 1: If the number of -particles observed in Rutterford experiment are 150 at 90° then the number of particles scattered under similar experimental conditions at 120° are approx 67. Statement 2 : Ionisation energy of deuterium atom is slightly lesser than that of hydrogen atom. Statement 3 : The difference in total energy always remain same between any two electronic shell in hydrogen atom irrespective of any reference value of potential energy assigned to n = . Select the correct statement. (A) Statements 1, 2 and 3 (B) Statements 1 and 2 (C) Statements 1 and 3 (D) Statements 2 and 3 ROUGHWORK Q.3 30 ml of CH3OH (d = 0.8 gm/cm3) is mixed with 60 ml of C2H5OH (d = 0.92 gm/ cm3) at 25°C to form a solution of density 0.88 gm/cm3.Select the correct option. (A) Molarity & molality of resulting solution are 6.33 & 13.59 respectively. (B) The mol fraction of solute and molality are 0.385 and 13.59 respectively. (C) % change in volume and molarity are zero and 13.59 respectively. (D) Molarity & mol fraction of solute are 13.59 & 0.485 respectively. Q.4 Al2(SO4)3 solution of 1 molal concentration is present in 1 litre solution of 2.684 gm/cc. How many moles of BaSO4 would be precipitated on adding BaCl2 in excess. (A) 3 moles (B) 2.684 × 3 moles (C) 6 moles (D) 2 moles Q.5 Number of P–H , P–O–P , P–O–H and P = O bonds in sodiumdihydrogenpyrophosphate respectively are (A) 1, 1, 1, 2 (B) 0, 1, 2, 2 (C) 0, 1, 1, 3 (D) 2, 0, 0, 2 Q.6 The question below consists of an Assertion and the Reason. Mark appropriate option using the given directions. (A) If both assertion and reason are CORRECT, and reason is the CORRECT explanation of the assertion. (B) If both assertion and reason are CORRECT, but reason is not the CORRECT explanation of the assertion. (C) If assertion is CORRECT but reason is INCORRECT. (D) If assertion is INCORRECT but reason is CORRECT. Assertion: Bond energy of F2 is higher than that of Cl2. Reason: According to VBT, 2p-2p overlap is stronger than 3p-3p. ROUGHWORK Q.7 The magnitude of resonance energy of benzene is 39 kcal/mole. It means that (I) the magnitude of experimental heat of hydrogenation is 39 kcal/mol more than that of hypothetical model. (II) 39 kcal/mol would be required to convert 1 mole of benzene into hypothetical 1, 3, 5 cyclohexatriene. (III) the magnitude experimental heat of formation of benzene is 39 kcal/mole less than that of a hypothetical model. (IV) this much amount of energyis involved in the conversion of cyclohexadiene to benzene and hydrogen (A) only (II) is correct (B) (I), (III) & (IV) are correct (C) (I) & (II) are correct (D) none of these Q.8 Which of the following options are written with correct order of polar nature of bonds. (i) NH3 > PH3 > SbH3 > AsH3 (ii) NH3 > AsH3 > SbH3 > PH3 (iii) NH3 > SbH3 > AsH3 > PH3 (iv) H2O > H2S > H2Se > H2Te (v) H2O > H2Te > H2Se > H2S (A) (i) & (iv) (B) (iii) & (iv) (C) (iii) & (v) (D) (ii) & (iv) Q.9 44 gm of a sample on complete combustion gives 88 gm CO2 & 36 gm of H2O. The molecular formula of the compound may be (A) C4H6 (B) C2H6O (C) C2H4O (D) C2H4 Q.10 The hybridization of iodine in ICl , IOCl , IOCl+ is 4 4 4 (A) sp3d, sp3d2, sp3d2 (B) sp3d, sp3d2, sp3d (C) sp3d2, sp3d2, sp3d (D) sp3d2, sp3d, sp3d2 Q.11 Which of the following would have permanent dipole moment. (A) SF4 (B) XeF4 (C) SiF4 (D) BF3 ROUGHWORK Q.12 The correct order of bond angles is (A) H2S < NH3 < BF3 < SiH4 (B) H2S < NH3 < SiH4 < BF3 (C) NH3 < H2S < SiH4 < BF3 (D) H2S < SiH4 < NH3 < BF3 Q.13 The maximum number of 90° angles between bond pair – bond pair is observed in (A) sp3d hybridisation (B) sp3d2 hybridisation (C) sp3d3 hybridisation (D) dsp2 hybridisation Q.14 Which molecular geometry is least likely to result from a trigonal bipyramidal geometry? (A) Trigonal planar (B) See-Saw (C) Linear (D) T-shape Q.15 Ionic conductance (I.C.) is a measure of electrical conductivity of ions in their aqueous solution. Select the option in which the values of ionic conductance given, are correctly matched with ions. Data: (A) Na+  50.1 mho cm2 mol–1, Cl–  65.5 mho cm2 mol–1 & K+  64.5 mho cm2 mol–1 (B) Na+  64.5 mho cm2 mol–1, Cl–  65.5 mho cm2 mol–1 & K+  50.1 mho cm2 mol–1 (C) Na+  50.1 mho cm2 mol–1, Cl–  64.5 mho cm2 mol–1 & K+  65.5 mho cm2 mol–1 (D) Na+  64.5 mho cm2 mol–1, Cl–  50.1 mho cm2 mol–1 & K+  65.5 mho cm2 mol–1 Select the correct alternatives. (One or more than one is/are correct) [5 × 5 = 25] There is NO NEGATIVE marking. Q.16 Select the incorrect statement(s): (A) In PO3 ion, the P–O bond order is 1.33. (B) Covalent bond can be formed by overlapping of py and pz orbitals (C) Bond angle in H2O is lesser than bond angle in OCl2 molecule. (D) SeF4 and CH4 have same shape. ROUGHWORK Q.17 Species having maximum number of lone pairs on the central atom is/are: (A) ClO– (B) XeF— (C) SF4 (D) — Q.18 Which is/are correct statement(s)? (A) The increasing order of carbon-carbon bond length is: Acetylene < Ethene < Benzene < Ethane (B) The increasing order of O–O bond length is: O2 < O3 < H2O2 (C) The decreasing order of O–N–O bond angle is: NO2+ > NO2– > NO3– (D) The decreasing order of first ionisation potential is: Ne > Cl > P > S > Mg > Al Q.19 Which of the following represent the equation relating density(d) and pressure(P) for a real / ideal gas at a particular temperature. (A) d = 4P + 0.02P2 (B) d = 4 + 0.02 P2 (C) d = 4P + 0.02 P4/3 (D) d = 4P Q.20 Assuming the bond direction to be z-axis, which of the overlapping of atomic orbitals of two atom (A) and (B) will result in bonding? (A) s-orbital of A and px orbital of B (B) s-orbital of A and pz orbital of B (C) py-orbital of A and pz orbital of B (D) s-orbitals of both (A) and (B) ROUGHWORK PART-B MATCH THE COLUMN [3 × 8 = 24] There is NEGATIVE marking. 0.5 Marks will be deducted for each wrong match. INSTRUCTIONS: Column-I and column-II contains four entries each. Entries of column-I are to be matched with some entries of column-II. One or more than one entries of column-I mayhave the matching with the same entries of column-II and one entryof column-I mayhave one or more than one matching with entries of column-II. Q.1 Column I Column II (A) XeF + (P) Two lone pairs (B) ICl – (Q) Planar (C) TeCl4 (R) Non-planar (D) I3+ (S) sp3d2 (Hybridization of central atom) Q.2 Column - I Column -II (A) NH4Cl (P) Polar covalent bond (B) CuSO4.5H2O (Q) Co-ordinate bond (C) O3 (Resonating structures) (R) Ionic bond (D) Solid N2O5 (Resonating structures) (S) Non Polar Covalent bond ROUGHWORK Q.3 Column - I Column -II (A) Energy of a photon having (P) 3.2 × 10–19 J wavelength 2480 Å is (B) Energy of an e– having (Q) 66.67 eV wavelength 150 pm is (C) Maximum kinetic energy (R) 3.0 × 10–16 J a photoelectron emitted from a metal [work function= 2eV] by a photon of wavelength 310 nm is (D) Energy of a particle of mass 2 amu, (S) 5 eV converted into energy is PART-C SUBJECTIVE: [4 × 9 = 36] There is NO NEGATIVE marking. Q.1 Mr Gupta has to decode a number ABCD. EF, where each alphabet is represented by a single digit. From the following information given about each alphabet. Identify the number. Info A = number of angular nodes of the orbital having 2(r) vs r curve given as Info B = number of subshells having energy between 8s & 8p. Info C = ratio of density of SO2 at 400 K to density of O2 at 800 K at same pressure. Info D = ratio of radius of 2nd Bohr orbit of He+1 to radius of 1st Bohr orbit of Be+3 Info E = number of radial nodes of an orbital whose radial wavefunction is represented as Y(r) = K . r. er / K2 (r2 – 5 K r + 6K2 ) 1 3 3 Info F = ratio of T.E to K.E for 1st orbit of H-atom assuming (T.E) = 27.2 eV Q.2 During preparation of sodium carbonate in the Solvay process CO2 gas is bubbled into the brine solution (NaCl in water) saturated with NH3 giving rise to following equations. NH3 + H2O + CO2  NH4HCO3 NaCl + NH4HCO3  NaHCO3 + NH4Cl Sodium hydrogen carbonate formed precipitate out & is then subjected to photoelectric dissociation to obtain sodium carbonate. 2NaHCO3 h Na2CO3 + CO2 + H2O If 100g of 58.5% brine solution (w/w) is mixed with 34 gm of NH3 & then 49.2 litres of CO2 at 1 atm pressure & 300 K is bubbled into the solution & the sodium bicarbonate is subjected to photochemical  molesof reactant dissociated  dissociation to obtain a quantum efficiency   molesof photons subjected  = 0.75 then what is the  value of total energy subjected in kJ if  of radiation is 1240 nm. Assume no NaHCO3 to be remaining after photochemical dissociation. [Use Avogadro's No. = 6 × 1023] Q.3 Gaseous ethylene, C2H4 reacts with hydrogen gas in the presence of a platinum catalyst to form ethane, C2H6 according to C2H4(g) + H2(g)  C2H6(g). A mixture of C2H4 & H2 known to contain more H2 than C2H4 had a pressure of 60 atm in an unknown volume. After the mixture had passed over platinum catalyst & C2H4 completely reached, the pressure was 100 atm in double the original volume at four times the absolute temperature as was earlier. Find out the mole % of H2 in the original mixture. Q.4 Calculate |H| (kJ) for the following reaction for 1 mole of CH3OH. 3 CH3OH (l) + 2 O2 (g)  CO2 (g) + 2H2O (g) |H| = ? Given: Resonance energy of CO2 = –140 kJ/mol Hvapourisation of methyl alcohol = 35 kJ/mol Bond energy(kJ/mol) C—H  410, O—H  460, C = O  710, C — O  350 & O = O  500