NH 3 , CO2
1. The The vol volum umee of of gase gasess 298 K are in CH 4
CH 4
and
adsorbed by one gram of charcoal at
> CO2 > NH3
1)
NH 3
> CH 4 > CO2
CO2
> NH3 > CH 4
2) NH 3
> CO2 > CH 4
3) 4) 2. n an e!"e e!"eri rim ment, ent, 2##ml 2##ml of #.$ #.$ % o!al o!alic ic acid acid is sha&e sha&en n 'ith 'ith 1# g of activated charcoal and filtered the filtrate is reduced to #.4%. The amount of
adsor"tion 1) #.9
x m÷
is 2) 1.8 log
3. (ra" (ra"h h bet bet'e 'een en
3) #.18
4) #.#9
x
log P log P
m
and
= = 4$#
θ
is a straight line inclined at an angle
.
log k = = #.*99
hen "ressure of #.$ atm and "er g of adsorbent 'ill be be
, the amount of solute adsorbed 1.$ g + g
1 g + g
1)
adsorbent 2.$ g + g
2)
adsorbent #.2$ g + g
3) ad a dsorbent 4) adsorbent 4. yo"hil yo"hilic ic sols are more more stable stable than lyo"ho lyo"hobic bic sols becaus becausee 1) The colloidal "articles have "ositive charge 2) The colloidal "articles have no charge 3) The colloidal "articles are solvated 4) There are strong electrostatic re"ulsions bet'een the negatively charged colloidal "articles hich of the follo'ing statements is not correct1) e"ti/ation is the "rocess by 'hich certain substances are converted into the colloidal state 2) %etal sols of gold, silver and "latinum can be "re"ared by 0redigs arc method 3) m"urities "resent in a solution ma&es it more stable
4) ialysis is a "rocess to remove im"urities of ions and molecules from a sol $. hen a hydro"hilic solute li&e gelatin is subected to electric field, the solute "articles move 1) To'ards cathode at " less the iso5electric "oint 2) To'ards anode at " greater than the iso5electric "oint 3) n neither direction at iso5electric " 4) 6ll of these *. 7or the coagulation of 1##ml of arsenous sul"hide sol 4 ml of 1% al is re:uired. hat 'ould be the flocculation value of al1) 4#
2) 2#
3) *#
4) 8#
BaCl 2
;. 6ddition of 4.# ml of #.##$ % solution to 1*.# ml of arseneous sol ust causes the com"lete coagulation. The ion that is effective in flocculation and its flocculating value are Ba 2+ ,1.2$
Ba 2+ ,1.#
1)
2)
Cl − ,2.$
3)
Cl − ,2.#
4)
8. 6t %, the surfactant molecules does not undergoes 1) 6ssociation
2) 6ggregation
3) %icelle formation
4) oagulation
9. hich one of the sols acts as "rotective colloid Fe ( OH ) 3
As2 S 3
1)
2) (elatin
3) 6u
4)
1#.6 'ea& acid 6 <#.$ molar) is 2#= dissociated in 'ater. f molal elevation constant of acid in 'ater is #.32$ the 0.t of solution is 1### C
1##.12$# C
1)
2)
1##.19$# C
3)
1##.$# C
4)
11.The correct e!"ression relating molality
( M B ) molar mass
of solute is
m=
M
m=
d + MM B
1)
M
m=
d − MM B
2)
d + MM B
m=
M
3)
d − MM B M
4)
12.To a 4 of #.2% solution a>, 2 of #.$% a> are added. The molarity of resulting solution is 1) #.9 %
2) #.3 %
3) 1.8 %
4) #.18 %
13.6 #.2 molal a:ueous solution of a 'ea& acid <?) is 2# "er cent ioni/ed. #
−1
K f = 1.8* Ckg mol
The free/ing "oint of this solution is <(iven 1)
−#.4$# C
#.9## C
2)
for 'ater)
#.31# C
3)
#.$3# C
4)
14.0en/ene and toluene form an ideal solution. 3 mole ben/ene and 2 mole toluene are added. @.. of "ure ben/ene and toluene are 3## A 2## mm of g res"ectively. The @.. of the solution is BBB
2) 2$#
3) 2*#
4) 44#
1$.6t a given tem"erature, total va"our "ressure in torr of a mi!ture of volatile
= 12# − ;$ X B
PTotal
com"onents 6 and 0 is given by
hence, va"our "ressure of
"ure 6 and 0 res"ectively < in torr) are 1) 12#, ;$
2) 12#, 19$
3) 12#, 4$
4) ;$, 4$
1*.The correct relationshi" bet'een the boiling "oints of very dilute solutions AlCl3 ( t 1 )
of
and t1
1)
CaCl2 ( t 2 )
, having the same molar concentration, is t1 > t 2
= t 2 2)
t2
3)
> t
t2
1
≥ t 1
4)
1;.The va"our "ressure of a solvent decreased by 1# mm of g 'hen a non volatile solute 'as added to the solvent. The mole fraction of solute in
solution is #.2, 'hat 'ould be the mole fraction of solvent if decrease in va"our "ressure is 2# mm of g1) #.8
2) #.*
3) #.4
4) #.2
18.i:uids 6 and 0 form an ideal solution. The correct one is 1) The enthal"y of mi!ing is /ero 2) The entro"y of mi!ing is /ero 3) The free energy of mi!ing is /ero 4) The free energy as 'ell as the entro"y of mi!ing are each /ero 19.6cetic acid e!ists in ben/ene solution in the dimeric form. n an actual e!"eriment, the @ant off factor 'as found to the #.$2. Then the degree of association of acetic acid is 1) #.48
2) #.88
3) #.9*
4) #.$2
2#.The boiling "oint of an a/eotro"ic mi!ture of 'ater ethanol is less than that of both 'ater and ethnol. Then 1) The mi!ture 'ill sho' negative deviation form Caoults 2) The mi!ture 'ill sho's "ositive deviation from Caoults la' 3) The mi!ture 'ill sho' no deviation from Caoults la' 4) This mi!ture cannot be considered as true solution K
= 18.* K mol −1 1## g
21.The amount of urea to be dissolved in $## m of 'ater < #.18*# C
solvent) to "roduce a de"ression of 1) $g
2) 3g
3) *g
in free/ing "oint is 4) 8g
22.hich of the follo'ing "lots correctly re"resents the behaviour of an ideal binary li:uid solution <6) lot of ! 6
<6) 1 % al has higher free/ing "oint than 1 % glucose solution. <0) 1 % al solution has almost same boiling "oint as 1 % Kl solution, assuming 1##= ionisation. <) 6""arent molecular 'eight of al 'ill be less than $8.$ in 'ater because it undergoes dissociation. <) i D 1 'hen acetic acid is dissolved in ben/ene. 24.To 1# m of 1% 0al 2 solution $ m of #.$ % K 2E>4 is added. 0aE> 4 is "reci"itated out. hat 'ill ha""en<6) 7ree/ing "oint 'ill increase
<0) 0oiling "oint 'ill increase
<) 7ree/ing "oint 'ill lo'er do'n
<) 0oiling "oint 'ill lo'er do'n
2$.K b of solvent ? is #.42 and K f of solvent F is 1.*2, match the follo'ing for "ossible values G Column I
Column II
<6)
Kf of solvent ?
)
#.*2
<0)
K b of solvent F
H)
1.82
<)
0oiling "oint of ?
C)
48I
<)
0oiling "oint of F
E)
$$I
2*.oint out the 'rong statement G hysical adsor"tion is characterised by <6) 6ttraction due to 'ea& @an der aalJs forces <0) rreversible nature of adsor"tion <) %ultimolecular adsor"tion layers <) ecrease in adsor"tion 'ith increase in tem"erature 2;.hich of the follo'ing statements are correct<6) hysical adsor"tion is multilayer, non5directional and non s"ecific.
<0) hemical adsor"tion first increases and then decreases 'ith increase in tem"erature. <) n some cases, solvent may be adsorbed in "reference to the solute on the surface of the adsorbent. <) 6s a result of adsor"tion, there is increase of surface energy. 28.6 solution of "almitic acid <% D 2$*) in ben/ene contains 4.24 g acid "er litre. hen this solution is dro""ed on the 'ater surface, ben/ene eva"orates and "almitic acid forms monomolecular film of the solid ty"e. f 'e 'ish to cover an area of $## cm 2 'ith a monolayer, the volume of solution should be used is y 1# L! cm3. The area occu"ied by one "almitic acid molecule may be ta&en to be
21× 10 −20 m 2 .
The value of ! isL
29.hich of the follo'ing are correct about Tyndall effect<6) True solution do not sho' Tyndall effect due to very small si/e of the "articles. <0) The diameter of the "articles of the dis"ersed "hase must not be much smaller than the 'avelength of light used. <) Tyndall effect is very 'ea& in case of lyo"hobic sols. <) The refractive inde! of the dis"ersed "hase and dis"ersion medium must differ considerably. 3#.hich of the follo'ing is re:uired in lo'est concentration for coagulating a sol having "ositively charged colloidal "article <6) Kl
<0) K2E> 4
<) K3 M7e<)*N <) K4M7e<) *N
31. 6dsor"tion isostere is <6) The curve sho'ing the effect of tem"erature on the e!tent of adsor"tion at a given "ressure <0) The curve sho'ing the variation of "ressure 'ith tem"erature, for a given amount of adsor"tion.
<)
The curve sho'ing the variation of adsor"tion 'ith "ressure at a constant
tem"erature. <) 6 line "arallel to !5a!is.
32. The "rotective "o'er of a lyo"hilic colloid is measured by the "ro"erty called <6) flocculation value
<0)
gold number
<)
<)
"e"ti/ation
ardy5Echul/e rule
33. The 0ro'nian motion is due to <6) tem"erature fluctuation 'ithin the li:uid "hase <0) attraction and re"ulsion bet'een charges on the colloidal "articles <) im"act of the molecules of the dis"ersion medium on the colloidal "articles <) convectional currents 34. orrect order of coagulating "o'er is
K+
> Mg2+ > Ca2+
Al+3
<6)
> Mg2+ > K +
<0)
Sn+4
> Al3 + > Mg2+
Sn+4
<)
> Al3 + = Mg+2
<)
100ml 3$. The coagulation of
of gold sol is com"letely "revented b y addition of #.2$ g of
starch. The gold number of starch is <6) #.#2$
<0) #.2$
<) 2.$
<) 2$
3*. Column – I
Column – II
<6)
6dsor"tion
<")
6ccumulation of molecular s"ecies at surface of solid or li:uid "oisonous gases
<0)
esor"tion
<:)
Eilica gel.
<)
harcoal
Cemoval of adsorbed material substance
<)
7or humidity
>ne of the adsorbents
KEY
1.3
2.3 3.3 4.3 $.4 *.1 ;.2 14.3 1$.3 1*.2 1;.2 18.1 19.3 2*.0 2$. <6L",:)O <0L")O <Lt,r)O <Lr,s) 32.0 33. 34.0 3$. 3*. A→ p
31.0
8.4 2#.2
9.2 21.2
2;.60
B→ r → s
SOLUTIONS
2. %ass of o!alic acid adsorbed by 1#g charcoal 3 = 2## × 1# ( #.$ − #.4 ) × 9# = 1.8 g −
x
1.8
m
1#
∴ =
= #.18
28. P@ litre volume of solution ta&en.
= < 4.24 × @) g
=
6tomic mass
× 6vogadro J s number
umber of molecules
= 4.24@ × *.#23 × 1# 23 2$*
$## × 1# − 4 m 2
= 4.24@ × *.#23 × 1# 23 × 21 × 1# −2# 2$*
6rea D
@ = #.####239 litre =
#.#239 cm
3
D 2.39 1#L2 cm3
3$.1## ml gold re:uires 2$# mg of starch 1# ml of gold re:uires 2$ mg of starch (old number D 2$
1#.3 22.
11.2 12.2 23.0, 28.2 29.60 → :, s
13.1 24.6 3#.
