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11101.

The stability of lyophilic colloids is due to which of the following?

Answer»

Charge on their particles
Large size of their particles
Small size of their particles
A LAYER of dispersion MEDIUM

Solution :The STABILITY of LYOPHILIC COLLOIDS is due to layer to dispersion medium around sol particles.
Discussion
11102.

Which of the following is Hofmann mustard oil reaction ?

Answer»

Reaction of primary amine with `CHCl_(3)`
Reaction of primary amine with `CHCI_(3) + KOH`
Reaction of primary amine with `CS_(2) + HgCl_(2)`
Reaction of aromatic amine with iodoform.

Answer :C
Discussion
11103.

Which of the following is kept in water

Answer»

WHITE phosphorus
sodium
potassium
calcium

SOLUTION :Phosphorous is kept in WATER DUE to INERT pair effect.
Discussion
11104.

Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

Answer»

Solution :The CHEMICAL reactions involved are :
`4Au(s)+8CN^(-)(aq)+2H_(2)O(aq)+O_(2)(g) to 4[AU(CN)_(2)]^(-)(aq) +4OH^(-)(aq)`
`2[Au(CN)_(2)]^(-) (aq) +Zn(s) to 2Au (s) +[Zn(CN)_(4)]^(2-) (aq)`
Zinc acts as a reducing AGENT in this reaction.
Discussion
11105.

Which of the following ores cannot be concentrated by froth floatation process ?

Answer»

BAUXITE
Cinnabar
Galena
Copper pyrite

Answer :A
Discussion
11106.

Type of isomerism Pair of examples{:("A) Ionisation","a) "[Pt(NH_3)_3Cl]_2[PtCl_4]&[Pt(NH_3)_2Cl_2]),("B) Linkage","b) "[Cr(NH_3)_6][Co(CN)_6]&[Co(NH_3)_6][Cr(CN)_6]),("C) Coordination","c)"[Co(NH_3)_5(NO_2)]Cl_2&[Co(NH_3)_5(ONO)]Cl_2),("D) Polymerisation","d) "[Co(SO_4)(NH_3)_5]Br&[Co(Br)(NH_3)_5]SO_4):}

Answer»

`{:(A,B,C,D),(a,b,c,d):}`
`{:(A,B,C,D),(b,a,d,c):}`
`{:(A,B,C,D),(d,c,b,a):}`
`{:(A,B,C,D),(d,b,c,a):}`

ANSWER :C
Discussion
11107.

Which of the following statements about vitamin B_12 is incorrect?

Answer»

It has a cobalt atom
It ALSO occurs in plants
It is also present in rain water
lt is NEEDED for human body in very small amounts

Solution :It is found in liver, egg, milk, MEAT, and fish. Minute are amounts are probably present in all ANIMAL CELLS. Peculiarly, unlike other vitamins, `B_12` is foundin significant amounts in green plants.
Discussion
11108.

Time taken to completely decompose 36 g of water by passing 3 A current is

Answer»

`35.8" hr"`
40 hr
`51.8" hr"`
`22.5" hr"`

Solution :`UNDERSET(36g(2 mol))(2H_(2)O) to 4H^(+)+O_(2)+underset((4F))(4e^(-))`
Now `Q=Ixxt` or `t=(Q)/(I)`
`t=4xx((96500" AS"))/((3A)):. 1.C=AS`
`=(128667s)/((3600 s))=35.8 hr`
Discussion
11109.

Write the monomers of Buna-N.

Answer»

SOLUTION :`underset(1,3"Butadiene")(H_2C = CH - CH)=CH_2+ H_2C =underset("ACRYLONITRILE")underset(CN)underset(|)(CH)`
Discussion
11110.

What is the effect of catalyst on the activation energy ? Why ?

Answer»

Solution :A catalyst LOWE down the activation energy. It provides an ALTERNATE path to the reaction. It FORMS an unstable intermediate which READILY changes into products .
Discussion
11111.

Which one of the following statement for order of reaction is not correct ?

Answer»

Order can be DETERMINED experimentally
Order of reaction is equal to SUM of the powers of concentration terms in different RATE LAW equation
It is not affect with stoichiometric coefficient of the reactants
Order can not be fracitonal

Answer :D
Discussion
11112.

When propene is treated with aqueous sulphuric acid in presence of mercuric sulphate, the major product is :

Answer»

Propanal
Propyl HYDROGEN sulphate
Propanol
Acetone

ANSWER :D
Discussion
11113.

Which of the followig statements is correct for galvanic cell written in an abbreviated from ?

Answer»

left electrode is cathode
RIGHT ELECTODE is anode
left electrode is POSITIVE terminal
right electrode is positive terminal

SOLUTION :RULES of represent cell.
Discussion
11114.

The strongest base among the following is

Answer»




SOLUTION :SEE A-Level INFORMATION.
Discussion
11115.

Which of the halogen forms the weakest hydracids ?

Answer»

SOLUTION :FLUORINE
Discussion
11116.

Which one of the following is an example for addition polymer?

Answer»

polyethylene
PVC
teflon
all the above

Solution : all the above
Discussion
11117.

Which of the following will show common ion effect and from a buffer solution

Answer»

`CH_(3)COONH_(4)` and `CH_(3)COOH`
`NH_(4)CL + NH_(4)OH`
`H_(2)SO_(4) + Na_(2)SO_(4)`
`NaCl + NaOH`

Solution :(a) is buffer because it contains WEAK acid and its salt and they will also SHOW common ION effect.
(b) Is also a buffer because it contains a weak acid and its salt. They will show common ion effect.
(c) Is not buffer solution because they contains strong acids and its salt. They will not show common ion effect
(d) Is not a buffer solution because it contains strong base and its salt. They will not show common ion effect.
Discussion
11118.

Which of the following pair cannot exist in solution?

Answer»

`NaHCO_(3)andNaOH`
`Na_(2)CO_(3)andNaOH`
`Na_(2)CO_(3)andHCl`
`NaHCO_(3)andHCl`

ANSWER :A
Discussion
11119.

Which crystal is expected to be soft and have low melting point?

Answer»

Covalent
Metallic
Molecular
Ionic

Answer :A
Discussion
11120.

Why aniline dissolves in HCI?

Answer»

Solution :`C_(6)H_(5)NH_(2) + HCI rightarrow [C_(6)H_(5)NH_(3)]^(+)CI^(-).` It DISSOLVES due to its basic nature.
Discussion
11121.

Which of the following is an aryl halide ?

Answer»




ANSWER :C
Discussion
11122.

Which statement is true ?

Answer»

ENDOTHERMIC REACTIONS have higher activation energies than exotlhermic reactions
The specific rate constant for a reaction is independent of the concentration of the reacting SPECIES
There is a single rate determining STEP in any reaction mechanism
None of the above

Answer :B
Discussion
11123.

Which of the following Ziegler -Nata catalyst ?

Answer»

`pd.BaSO_4`+ QUINOLINE
`(C_2H_5)_3Al+TiCl_4`
Phyriniumchlorochromate
zn.Hg+cons.HCl

Answer :B
Discussion
11124.

Which of the following methods is/are correct for the synthesis of

Answer»

a.`PhBr UNDERSET((1) Li(2) CuI (3) PrCOCl)OVERSET((4)Zn-Hg//HCl)(rarr)`
b.`PhCOPr overset(Zn-Hg//HCl)(rarr)`
C. `PhCOPrunderset(overset(ɵ)(O)H, Delta)overset(NH_(2)NH_(2))(rarr)`
d.

Solution :`(a, b, c, d)` All the REACTIONS are correct.
Discussion
11125.

Which one of the following undergoes reaction with 50% NaOH solution to give the corresponding alcohol and acid?

Answer»

BUTANAL
PHENYL METHANAL
Phenol
Ethanal

SOLUTION :Phenyl methanal
Discussion
11126.

Vapour phase nitration of propane follows

Answer»

electrophilic substitution mechanism
free RADICAL substitution mechanism
nucleophilic substitution mechanism
electrophilic ADDITION mechanism.

Solution :`HO-NO_(2) OVERSET(400^(@)C)(rarr) Hoverset(*)(O)+overset(*)(N)O_(2)` ltbr. `R-H+ overset(*)(N)O_(2) overset(overset(*)(O)H)(rarr) RNO_(2)+H_(2)O`
Discussion
11127.

When Cl_2 reacts with Fe (or) Cu it does not form

Answer»

`FeCl_(2)`
`CUCL`
`FeCl_(3)andCuCl_(2)`
`FeCl_(2)andCuCl`

ANSWER :D
Discussion
11128.

What are neurologically active drugs ? Give two examples.

Answer»

SOLUTION :Tranquilizers and ANALGESICS are neurologically ACTIVE DRUGS. Example : Equanil, morphine.
Discussion
11129.

Which of the following type of linkagepresent in PHBV ?

Answer»

amide
ESTER
diene
nitrile

SOLUTION :PHBV has `-OVERSET(O)overset(|)C-O-`linkage
Discussion
11130.

Which of the following is least ionic ?

Answer»

NaCl
AgCl
`BaCl_(2)`
CsCl

Answer :B
Discussion
11131.

Two moles of PCI_5 is heated in a closed vessel of 2 litre capacity. When the equilibrium is attained 40% of it has been found to be dissociated . What is the value of K_c in "mol"//dm^3 ?

Answer»

0.532
0.266
0.133
0.25

Answer :B
Discussion
11132.

Why are secondary and tertiary alcohols not suitable for praparing ethers by dehydration with conc. H_(2)SO_(4) ?

Answer»

SOLUTION :Both secondary and tertiary alcohols react wih conc. `H_(2)SO_(2)` according to `S_(N^(1))` mechanism in which carbocation intermediates are FORMED. These intermediates preferbly lose a `H^(+)` ion from `beta` carbon leading to alkenes as a result of elimination rather than taking part in subsitutio reactions forming ethers. For details, consult METHODS of preparation of ethers (section 22)
Discussion
11133.

The silicates which contain discrete tetrahedral units are ___________

Answer»

ORTHO silicates
sheet silicates
pyrosilicates
three DIMENSIONAL silicates

Answer :B
Discussion
11134.

What is osmotic pressure ? Draw a lablled diagream of Berkeley-Hartley method for the determination of osmotic [resire.

Answer»

SOLUTION :For ANSWER CONSULT SECTION 12.
Discussion
11135.

What is the volume of solution containing 1g mole of sugar that will give rise to an osmotic pressure of 1atmosphere at 0^(@)C ?

Answer»


Solution :`pi=1 ATM, n=1"G mol",R=0.0821"L atm K"^(-1)mol^(-1),T=0^(@)C=0+273=273 K`
`pi=n/VRTor V=n/piRT`
`V=((1"gmol")xx(0.0821"L atm K"^(-1)mol^(-1))xx(273 K))/((1"atm"))=22.4 L`.
Discussion
11136.

Which of the following sulphates have the highest solubility in water ?

Answer»

`BeSO_(4)`
`MgSO_(4)`
`BaSO_(4)`
`CaSO_(4)`

ANSWER :A
Discussion
11137.

What causes Brownian movement in colloidal solutions ?

Answer»

Solution :It is due to the UNBALANCED bombardment of molecules of dispersed PHASE by molecules of DISPERSION medium.
Discussion
11138.

Which of the following can be detected by silver mirror test

Answer»

`CH_(3)COCH_(3)`
`CH_(3)COOH`
`C_(2)H_(6)`
`CH_(3)CHO`

ANSWER :D
Discussion
11139.

What do you mean by denaturation of a protein ? How does it affect properties of protein ?

Answer»

SOLUTION :On heatingor on TREATMENTWITH mineralacidselectrolyes ETC . Thewatersolubleglobularproteinsundergo coagulationresultingin thelossof biologicalactivitytogivefibrousproteins. Thisprocessis calleddenaturationoof PROTEINS
Discussion
11140.

What is electrophoresis? How many types of electrophoresis you have studied?

Answer»

Solution :The migration of colloidal PARTICLES under the influence of ELECTRIC FIELD EITHER to anode or cathode is cold electrophoresis.
Discussion
11141.

Which of the following is a local anesthetic?

Answer»

Diazerpam
Procaine
Mescaline
None of these

Answer :B
Discussion
11142.

Using the data provided, calculate the multiple bond energy (kJ mol^(-1)) of a C-=C bond in C_(2)H_(2). That energy is (take the bond energy of a C-H bond as 350 kJ mol^(-1))2C(s)+H_(2)(g)rarrC_(2)H_(2)(g)""DeltaH=225 kJ mol^(-1)2C(s)rarr2C(g)""DeltaH=1410kJ mol^(-1)H_(2)(g)rarr2H(g)""DeltaH=330kJ mol^(-1)

Answer»

1165
837
865
815

Solution :
`THEREFORE DeltaH=+1410 + 330 -(350xx2)-epsilon_(C-=C)=+225`
`therefore epsilon_(C-=C)=1740-1700-225=+815 kJ//mol`.
Discussion
11143.

When rate of evaporation and condensation become equal in a closed container containing a liquid.

Answer»

Cooling will be caused
The amounts of the SUBSTANCE in the liquid and vapour states BECOME equal
The amounts of the substance in the liquid and vapour states become constant
Some liquid starts SOLIDIFYING.

ANSWER :C
Discussion
11144.

Which of the following is FALSE regarding diethyl ether ?

Answer»

The oxygen atom contains one LONE PAIR of electrons.
It is sparingly SOLUBLE in water
It is used as an INERT medium for many organicreactions.
It is highly inflammable.

Answer :A
Discussion
11145.

Which of the following is weakest base in water ?

Answer»

Aniline
p - nitroaniline
Trimethylaniline
Ammonia.

Answer :B
Discussion
11146.

When borax is heated in a platinum loop, the transparent bead formed contains

Answer»

`Na_(2)B_(4)O_(7)`
SODIUM metaborate +`B_(2)O_(3)`
Water
CaO

Solution :`UNDERSET("Borax")(Na_(2)B_(4)O_(7)).10H_(2)O overset(DELTA)to underset("sodium metaborate")(2NaBO_(2))+underset("Boric anhydride")(B_(2)O_(3))`
Discussion
11147.

When an alkyl halide is treated with ethanolic solution of KCN, the major product is alkyl cyanide where as if alkyl halide is treated with AgCN,the major product is alkyl isocyanide?

Answer»

SOLUTION :REFER NCERT
Discussion
11148.

Which of the following proposed reactions would take place most quickly under mild conditions ?

Answer»

`CH_(3)–CO–NH_(2) + NaCl to CH_(3)COCL + NaNH_(2)`
`C_(6)H_(5)-CO-Cl+CH_(3)NH_(2) to C_(6)H_(5) - overset(O)overset(||)C-NH-CH_(3)`
`CH_(3)–CO–Cl+CH_(3)NH_(2) toCH_(3)–CO–NH–CH_(3)`
`CH_(3)-COO-C_(2)H_(5)+HOH overset(NaOH)to CH_(3)-COONa+C_(2)H_(5)OH`

ANSWER :C
Discussion
11149.

What reagents could you use for te following conversions. (a). MeCO(CH_(2))_(2)CO_(2)EttoMeCHOH(CH_(2))_(2)CO_(2)Et (b). HO_(2)C(CH_(2))_(4)COCl to HO_(2)C-(CH_(2))_(4)CH_(2)OH (c). O_(2)N(CH_(2))_(2)CNtoO_(2)N(CH_(2))_(2)CH_(2)NH_(2) (d). O_(2)N(CH_(2))_(2)CH=CH_(2)toH_(2)N(CH_(2))_(2)CH=CH_(2) (e). Me_(2)CHCOCltoMe_(2)CHCHO (f). O_(2)N(CH_(2))_(3)CHOtoO_(2)N(CH_(2))_(3)CH_(2)OH (g). O_(2)N(CH_(2))_(2)CH=CH_(2)toO_(2)N(CH_(2))_(3)CH_(3)

Answer»

Solution :(a) `NaBH_(4)`
(B). `NaBH_(4)`
(c). `Na+C_(2)+C_(2)H_(5)OH`
(d). `LiAlH_(4)`
(E). `H_(2)-Pd//BaSO_(4)`
(f). `NaBH_(4)`
(G). `N_(2)H_(4)+H_(2)O_(2),Delta`
Discussion
11150.

What will be the nature of existence of an amino acid (containing one amino and one carboxylic acid group) in solution of pH lt pK_(a_(1))?

Answer»

It EXISTS an anion
It exists as cation
It exists as ZWITTER ion
It exists as NEUTRAL SPECIES with no charge

Answer :B
Discussion