XII- TEST PAPER OF PHYSICAL CHEMISTRY-FOR 2018

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                                                       XII CHEMISTRY-Physical test-2
  • TIME 1;30 hrs                                                                                                      mm 45                                              
  • Q1.(a)Give the significance of a ‘lattice point’.                                                     (1)
  • Q2.compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?                         (2)
  • Q3.A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3rd of tetrahedral voids. What is the formula of the compound?                                   ( 2)
  • Q4.An element with molar mass 2.7×10-2 kg mol-1 forms a cubic unit cellwith edge length 405 pm. If it)s density is 2.7×103 kg-3, what is thenature of the cubic unit cell?                                                           (2)      
  • Q5.A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong?                                                                              (2)
  • Q6.Silver crystallises in fcc lattice. If edge length of the cell is 4.07 × 10–8cm and density is 10.5 g cm–3, calculate the atomic mass of silver.                                                                                                           (2)
  • Q7.Analysis shows that nickel oxide has the formula Ni 0.98O1.00 What fractions of nickel exist as  Ni +2Ni+3 ions?                                                                                                                                                 (2)
  • Q8.Classify the miture when            
  •  (i) Ge doped with In 
  • (ii) B doped with Si.                                   (2)
  • Q9.If NaCl is doped with 10–3 mol % of SrCl2, what is the concentration of cation vacancies?      (2)
  • Q10. Write short notes on 
  •  (a) Azeotropic mixture      
  •   (b) Kholrausch law                                       (4)

  •  (c) Write advantage of Fuel cell            
  • (d) Ferromagnetism
  •   (c)Write only chemical reaction dor lead storage battery during discharging                              (2)
  •        (d) How molar conductivity change with change in diution.                                                          (2)
  • Q12.(a)Write example for non ideal solution showing negative deviation.                                        (2)
  •          (b)What happen when RBC is putted in 0.8% aqueous solution.                                               (2)
  •         (c) Write three difference between schottky and frenkel defect.                                                    (2)
  •         (d) What do you mean by F-center..                                                                                      (2)
  • Q14. (i) 5% Aqueous solution of glucose is isotonic with 1% aqueous solution of unkown. Find molecular mass of solution.                                                                                                                  (2)
  • (ii)19.5 gm of CH 2FCOOH  were dissolve in 500 ML of water and depressed F.P by 10c. Calculate its degree of dissociation if  kf = 1.86 m/mol.                                                                                     (2)
  • Q15.    (a) Cr/Cr3+ (1M)//Fe2+ (2M) /Fe      if E0CELL = 0.30 Find out its elecromotive force.              (2)
  • (b)How much faraday will be required to deposit 27 gm of aluminium from Alcl3.                                       (2)
  • Q16. 90% of a reaction complete in 5 min. how much time it will take to comlete 99%.                  (2)
  • Q17.Conductivity of 0.00241 M acetic acid is 7.896x10-5s cm-1 . Calculate its molar conductivity.If molar conductivity standardis 390.5 s cm2 mol-1.. Calculate its dissociation constant.?                  (2)
  • (b)Define standard electrode potential.                                                                                                    (2)

Comments

  1. DR SUDHIR TOMAR7 August 2017 at 21:13

    SOLVE IT AND ASK FOR ANSWER.THESE ARE IMPORTANT QUESTION FOR CBSE-2018 BOARD ALSO

    ReplyDelete

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