1)  Niobium crystallizes in body centred structure.  if density is 8.55 gm/cm^3  ,then atomic radius of niobium given that its atomic weight is 92.9  is
    a             0.143nm
    b)          0.143angstrom unit
    c)        0.0143angstrom unit
    d)none of these


2)     A metal cystalizes into 2 cubic phases   ,fcc and bcc  ,whose unit cell lengths are 3.5   and 3.0  angstrom
the ratio of their densities is
   a)1.26
   b)2.52
   c)0.63
d)none

3) the crystal ab has molecular weight 6.023 y amu  where t is an arbitary number  .if minimum  distance between cation and anion is y^1/3  nm   ,then type of defect is

a)  interstitial
b)  frenkel
c)   frenkel and schotky
d)  schotky



4)the molal frezing poimt depression constant of benzene is 4.90K Kg/MOL   ,selenium is a polymer Sx   with 3.26  gm of selenium   dissolved   in 226  g of benzene .  the freezing point deprseion is 0.112Clower than for pure benzene.  molecular formula of Sx is then
a)  Sx8     b)Sx10     c)  SX9      d)Sx7



5)2.0  g of benzoic acid dissolved in 25  gm of benzene shows a depression in frezing point equal to 1.62  K  .  if Kf is 4.9K Kg /Mol  ,then  %association of acid solution is 
a)99.2  b)98.1   c)94.3  d)none of these



6)  2 student use stock of solution of CuSO4 .  the emf os one cell is 0.03 v higher,  with concentration 0.5m

then concentration of CuSO4 solution in other cell is
a)0.05   B)  0.07     c)  0.7     d)0.007



7)the standard potentail of following cell is 0.23v  at  15C  and 0.21  at 35  C
  
  Pt  /  H2(g)  /HCl(aq)  /AgCl3(s)/Ag(s)
.
the solubility of AgCl in water at 25 C if atandard reduction potential of  Ag+(aq)  /  Ag(s)  couple is 0.80 v at 25 is

a)  1.24   *10^ -5               mol/l
b)1.24  *10^  -4                 mol/l
c)  1.36   *10^  -4              mol/l
d) 1.36 *  10^  -5               mol/l




8)  for galvanic cell  Ag  /AgCL  (s)  /KCl (0.2m) //  KBr (0.001  m)  /AgBr  (s)    /Ag

emf of cell at 25 C  for spontaneous raection is  if
Ksp (AgCl)  =2.8  *  10  ^  -10
Ksp  (AgBr)  =3.3  *10^  -13

a)0.04            b)0.004            c) 0.4      d) 0.44


9)Rate of reaction quadrapel when temp changes from 293 k to 313 k  . activation energy is
    a)52.8   
    b)64.8
    c)54.7
    d)60.6
all option in si unit



10)in first order reaction conc of reaction decreses from 800ml/lit  to   50ml/lit    in   2*10^4 sec    ,then rate constant is

a)2*10^4
 b)3.45*10^-4
c)1.3  *10^-4
d)2*10^-4





11)the catalytic decomposition  of N2O  by gold at 900 C  and an initial pressure of 200mm is 50%  completes in 53.min  &73%  in 100  min
then amount of it decompose in 100 min  at same temp  but initail pressure of 600mm is
a)73%  b)50%  c)64%   d)100%


12)a liquid is found to scatter a beam of light ,but leaves no residue when passed through filter paper  .then liquid is
           a)suspension  B)oil  c) colloidal  d)true solution


13)the best co agulant   for participation of ferric hydroxide  is 
a)Na3PO4    b)NaNO3   c)KCl   d)  MgSO4



14) the outer most electronic configuration of most electronegative elememnt is

a)  ns2  np3    B)  ns2np4   c)ns2np5   c)  ns2np6




15) a compound   x on heating give co2 gas  and residue which mixed with water gives  y on  passing co2 in excess  to obtain  z  in clear solution which  on boiling gives  x
then x is

a)  Na2CO3    b)  K2CO3    c)   Ca(HCO3)2    d)   CACO3





16)the geomatry of Ni(co)4  and  NI(pph3)2cl2 are

a)both are square planer
b)tertrahedral  and square planer
c)both tetrahedral
d)square planer  andtetrahedral



17) an alkyl halide  x  on treatment with potassium tertiary butoxide give 2 isomeric alkenes  y and z  .both on hydrogenation give 2  3-dimethyl butanethen major product iduring first reaction is
a)2 3 dimethy but2ene
B)2 3dimethyl but1ene
c)2 3 dimethyl prop2 ene
d)  2 3 dimethyl  prop1ene



18)in reaction with   p chlorobutane  with KNH2 in liquid ammonia  ,major product obtained is
a)o tuluidene
b) m toludine
c)p toludine
d) p chloraanilline


19) resorcinol  and phloroglucinol  are
a)1 , 3 dihydroxybenzane  and benzene  1,3,5 triol
b)1 ,2 dihydroxybenzene  &benzene  1,2,5 triol
c)  1,4 dihydroxybenzene  &1,2,3 triol
D) 1,4 dihydroxybenzen  &benzene  1,2,4 triol



20)cyclamate  is
a)  iso Cyclohexyl sulphamete
b)  N  cyclohexyl  sulphamate
c)  ter cyclohexyl   sulphamate
d)   iso cyclohexyl sulphamate


21)  activated amino acids are pased through in t rna
a)  d arm
b)  b arm
c)  acceptor arm
d)none