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
E-Store
test by me
