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3801.

What is the % dissociation of CH_(3)COOH, if equivalent conductivity at this dilution and at infinite dilution are 148 and 398 S cm^(2)//mol respectively

Answer»

`37.18%`
`47%`
`48.78%`
`10.8%`

SOLUTION :Degree of dissociation, `alpha`
`=("Equivalent conductance at concentration C")/("Equivalent conductance at INFINITE dilution")`
`=(148)/(398)=0.3718`
i.e., `CH_(3)COOH` is 37.18% DISSOCIATED.
Discussion
3802.

Which of the following ion is easily oxidised

Answer»

`SM ^(2+)`
`Ce ^(4+)`
`ND^(4+)`
`Ce ^(3+)`

Answer :A
Discussion
3803.

Which of the following alcohols will give the positive iodoform test ?

Answer»

SOLUTION :`CH_3-underset"OH"underset|CH-` GIVE IODOFORM TEST
Discussion
3804.

Which of the following is narcotic drug?

Answer»

Asprin
BHA
Ibuprofen
Codeien

ANSWER :D
Discussion
3805.

Using the required bond-energies data from the above problems, calculate the heat of hydrogenation of ethene to ethane.

Answer»


ANSWER :(-29.7 KCAL)
Discussion
3806.

When phenol is treated with CHCl_(3) and NaOH, the major product formed is

Answer»

o-hydroxybenzaldehyde
p-hydroxybenzaldehyde
o-hydroxybenzoic acid
p-hydroxybenzoic acid

Answer :A
Discussion
3807.

Which of the following is an isotonic pair

Answer»

`._(19)^(40)K, ._(20)^(40)Ca`
`._(19)^(39)K, ._(20)^(40)Ca`
`._(18)^(33)Ar, ._(18)^(40)Ar`
`._(18)^(40)Ar, ._(20^(40)Ca`

Solution :Isotones have same number of neutrons
Discussion
3808.

Which of the following structures represents 2-bromo-6-isobutyl-4-methyldec-3-en-1-ol?

Answer»




ANSWER :D
Discussion
3809.

Write the free radical mechanism for the polymerisation of ethene.

Answer»

SOLUTION :Refer to POINT VI of "Chapter AT A GLANCE"
Discussion
3810.

The species which can best serve as an initiator for the cationic polymerization is

Answer»

`HNO_3`
`AlCl_3`
BuLi
`LiAIH_4`

SOLUTION :CATIONIC polmyerization is INITIATED by USE of strong protonic acid such as `H_2SO_4` or Lewis acids such as `AICI_3,BF_3`, etc. Thus , option (B) is correct.
Discussion
3811.

Total volume of atoms present in a face centered cubic unit cell of a metal is

Answer»

`12/3 PIR^(3)`
`16/3 pir^(3)`
`(20)/sqrt(3)pir^(3)`
`24/3 pir^(3)`

Answer :B
Discussion
3812.

When an ideal gas expands in vacuum, no cooling is observed because the molecules

Answer»

have ELASTIC collisions
do work EQUAL to loss in kinetic energy
do not have MOLECULAR attractions
are at REST in vacuum

Answer :C
Discussion
3813.

Which of the following is used to demineralise water?

Answer»

PERMUTIT
COMMON salt
ION EXCHANGE RESIN
Charcoal

Solution :Ion exchange resin
Discussion
3814.

The time required by a certain volume of oxygen of diffuse through a small hole is 3600 seconds. Calculate the time required by the same volume of chlorine to diffuse through the same hole.

Answer»


ANSWER :5360 s
Discussion
3815.

What is refining process?

Answer»

Solution :GENERALLY the METAL extracted from its ore contains some IMPURITIES such as unreacted oxide ore ,other metal,nonmetal etc.Removal of such impurities associated with the isolated crude metal is called refining process.
Discussion
3816.

Which of the following compounds is found abundantly in nature?

Answer»

Fructose
Glucose
Starch
Cellulose

ANSWER :D
Discussion
3817.

The sodium extract on acidification with acetic acid and then adding lead acetate solution gives a black precipitate. The organic compound contains:

Answer»

Nitrogen
Halogens
Sulphur
Phosphorus

ANSWER :C
Discussion
3818.

When H_2S reacts with halogens, halogens:

Answer»

are oxidised
are reduced
form SULPHUR halides
none

Answer :B
Discussion
3819.

Which of the following is correct about H- bonding is DNA ?

Answer»

A- T, G-C
A-G, T-G
G-T, A-C
A-A, T-T

Solution :In DNA, adenine (A) forms two hydrgen bonds with THYMINE (T) and guanine (G) forms three HYDROGEN bonds with cytosine (C )
Discussion
3820.

Which one of the following compounds has similar structure to that of graphite ?

Answer»

Boron NITRIDE
Boron CARBIDE
ALUMINIUM Carbide
Aluminium Oxide

ANSWER :A
Discussion
3821.

Which is the incorrect statement-

Answer»

density decreases in case of crystals with SCHOTTKY DEFECT
NaCl(s) is insulator, silicon is SEMICONDUCTOR, silver is conductor, QUARTZ is piezo-electric crystal
Frenkel defect is favoured in those ionic compounds in which sizes of cation and ANIONS are almost equal
`FeO_(0.98)` has non-stoichiometric metal deficiency defect

Solution :In Frenkel defect, the radius of cations are smaller than that of anions present in unit cell.
Discussion
3822.

Which of the following is dependent on temperature ?

Answer»

Molality
Molarity
Mole fraction
Weight percentage

Answer :B
Discussion
3823.

When ozone reacts with an olefin, the cleavage of the olefin across the double bond leads to the formation of:

Answer»

ALDEHYDE
Ketone
Both (a) and (B)
Acid

Answer :B
Discussion
3824.

which of the following sdoes not show optical isomerism ?

Answer»

`[Co(NH_(3))_(3)Cl_(3)]`
`[Co(EN)Cl_(2)(NH_(3))_(2)]^(+)`
`[Co(en)_(3)]^(3+)`
`[Co(en)_(2)Cl_(2)]^(+)`
(E = ethylenediammine)

Solution :Complexes of the type `MA_(3)b_(3)` donot show any optical isomerism. THEREFORE, `[Co(NH_(3))_(3)Cl_(3)]` will not have any optical ISOMER.
Discussion
3825.

The S_(N)2 reaction involves back - side attack and therefore results in a ''Walden Inversion.'' For which one of the substrates shown would you be able to demonstrate that such back - side attack with ''Walden Inversion'' has infact occurred?

Answer»

1 - bromopropane
2 - bromobutane
3 - bromopentane
Methyl bromide

Answer :B
Discussion
3826.

Which of the nucleoside? following is not present in

Answer»

PHOSPHORIC acid
cytosine
uracil
guanine

Answer :A
Discussion
3827.

Which of the following is a protein fibre ?

Answer»

COTTON
RAYON
SILK
POLYESTER

SOLUTION :Silk
Discussion
3828.

Which of the following has highest electrode potential

Answer»

Li
Cu
Au
Al

Answer :C
Discussion
3829.

Write the IUPAC names of : (i) CH_(3)CH_(2)CH_(2)underset(CH_(3))underset(|)(C)HCH_(2)CHO (ii) CH_(3)COunderset(C_(2)H_(5))(C)HCH_(2)CH_(2)Cl (iii) (iv) (v) CH_(3)-underset(CH_(3))underset(|)(C)H-overset(O)overset(||)(C)-underset(CH_(3))underset(|)(C)H-OC_(2)H_(5) (vi) CH_(3)-underset(CH_(3))underset(|)(C)H-CO-underset(CH_(3))underset(|)(C)H-CH_(3) (vii) CH_(3)-underset(C_(6)H_(5))underset(|)(C)H-overset(O)overset(||)(C)-underset(CH_(3))underset(|)(C)HOCH_(2)CH_(3) (viii) CH_(3)-underset(CH_(3))underset(|)(C)H-overset(O)overset(||)(C)-underset(CH_(3))underset(|)(C)H-Br (ix) OCH.CHO (x) (xi) CH_(3)-underset(NH_(2))underset(|)(C)H-underset(OH)underset(|)(C)H-underset(O)underset(||)(C)-C_(2)H_(5) (xii) CH_(3)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)CHO (xiii) (xiv) CH_(3)-underset(CH_(3))underset(|)(C)H-CH_(2)-CH_(2)-underset(O)underset(||)(C)-CH_(2)Cl (xv) (xvi) CH_(3)-CH_(2)-CH=CH-overset(O)overset(||)(C)-H

Answer»

SOLUTION :(i) 3-Methylhexanal
(ii) 5-Chloro-3-ethylpentan-2-one
(iii) (4-Chlorophenyl) ethanal
(iv) 2-(2-Bromophenyl) ethanal
(V) 2-Ethoxy-4-methylpentan-3-one
(vi) 2,4-Dimethylpentan-2-one
(vii) 2-Ethoxy-4-phenylpentan-3-one.
(viii) 2-Bromo-4-methylpentan-3-one.
(ix) Ethanedial.
(x) 2-Phenylpropanal
(XI) 4-Amino-3-hydroxypentan-2-one
(XII) 3-Methylpentanal
(xiii) 3,7-Dimethylocata-2, 6-diental
(XVI) 1-Chloro-5-methylhexan-2-one
(xv) 3-Hydroxy-2, 2 ,4-trimethylpentanal
(xiv) Pent-2-enal
Discussion
3830.

The value of x in the complex H_(x)Co(CO)_(4) on the basis of EAN rule is

Answer»


SOLUTION :`x=36-27-8=1`
Discussion
3831.

Which of the following is primary amine?

Answer»

t-butyl amine
aniline
sec. butylamoine
N-methyl methanamine

Answer :A::B::C
Discussion
3832.

What is 'X' in given reaction ?

Answer»

2, 4- dinitrophenol
4 - NITROPHENOL
2,4,6 - trinitrophenol
BENZOPHENONE

Answer :B
Discussion
3833.

When hydrogen sulfide reacts with sulfur dioxide to give sulfur and water,

Answer»

Both `H_2S` and `SO_2` are oxidised
Both `H_2S` and `SO_2` are REDUCED
`H_2S` is oxidised and `SO_2` is reduced
`H_2S` is reduced and `SO_2` is oxidised

Solution :`H_2S` is oxidised and `SO_2` is reduced
Discussion
3834.

The total number of optical isomers in open-chain aldohexose (such as glucose) is

Answer»

8
8
16
2

Answer :C
Discussion
3835.

Wrought iron is the purrest form of iron. Write a reaction used for the preparation of wrought iron from cast iron. How can the impurities of sulphur, silicon and phosphorus be removed from cast iron?

Answer»

Solution :The equation for the conversionof `Fe_(2)O_(3)" to " FE` is
`Fe_(2)O_(3) +3C to 2Fe+3CO`
Limestone is added as FLUX. Sulphur, SILICON and phosphorus change to their OXIDES and pass into the slag.
Discussion
3836.

Which of the following on oxidation gives an acid containing two carbon atoms

Answer»

ETHYL amine
Ethyl nitrile
Ethanamide
Ethanol

Answer :D
Discussion
3837.

Which one of the following is incorrect for ideal solution?

Answer»

`DeltaH_("MIX")=0`
`DeltaU_("mix")=0`
`DeltaP=P_("obs")-P_("calculated by Raoult's LAW")=0`
`DeltaG_("mix")=0`

SOLUTION :For ideal solution, `DeltaH_("mix")=0,DeltaU_("mix")=0, DeltaS_("mix")ne0`
As `DeltaG_("mix")=DeltaH_("mix")-TDeltaS_("mix")-therefore DeltaS_("mix") ne 0`
Discussion
3838.

Two aqueous solutions S_(1) and S_(2) are separated by a semi-permeable membrane. S_(2)has lower vapour pressure than S_(1). Then

Answer»

more SOLVENT will FLOW from `S_(1) to S_(2)`
more solvent will flow from `S_(2) to S_(1)`
solvent from `S_(1) and S_(2)` will flow at equal rates
no flow will TAKE place.

Solution :Higher the CONCENTRATION, lower is the vapour presure. Thus, `S_(1)` has lower conc. Than `S_(2)`. More solvent will flow from `S_(1)` to `S_(2)`.
Discussion
3839.

Which of the following is not synthetic rubber?

Answer»

POLY 1,3-butadiene acrylonitrile
poly 1,3 butadiene styrene
BUTYL rubber
POLYISOPRENE

Answer :D
Discussion
3840.

Which doesn't follow Markovnikov's rule

Answer»

`CH_3-CH=CH_2`
`CH_3CH=CHCH_3`
`CH_3-undersetunderset(CH_3)|CH-CH=CH_2`
`CH_3-CH_2-CH=CH_2`

SOLUTION :Markownikoff's RULE cannot be APPLIED for symmetrical ALKENE
Discussion
3841.

Whatmass of Pb^(2+)ion is leftin solution at theend point. (ii) 0.16g ofN_(2)H_(4)is dissolved in waterandthetotalvolumemade up to500 ml.Calculatethe percentageof N_(2)H_(4) that hasreactedwith waterat this dilution . TheK_(b) for N_(2)H_(4) is 4.0 xx 10^(-6) M .

Answer»

SOLUTION :(i) 1165 MG(II) 2%
Discussion
3842.

Which one of the following can act as an inert electrode ?

Answer»

GRAPHITE
COPPER
Platinum
EITHER a (or ) C

Answer :D
Discussion
3843.

Write notes on the following : i)Artificial sweetening agents ii)Food preservativesiii)Antioxidants in food.

Answer»

Solution :i)Artificial sweeterning agents:The chemial substances which are used instead of sucrose (or)sugar are called artificial sweetening agents.
E.g:Aspartame,Alitame,saccharin.

i)These desease the calorific intake and the same time sevral sweeter than sucrose. 2)Artificial sweetening agents are very useful to diabetic persons
3)These are harmless.
4)Aspartame is unstable at cooking tamperature so it's use is limited to cold foods and soft drinks,
5) THe sweetening agent used in the prepration so it is stable at cooking temprature.
6) While using alitame as artificial sweeterner,the control of sweetness of food due to microbial growth are called food preservatives.sodium benzote,`C_(6)H_(5)` COONa is the important food preservative used in limited QUANTITIES and is metabolised by conversion into hippuricacid.Which is finally excreted in the urine salts of sorbiacid,propionic acid are also food presevatives.
iii) Antioxidants: 1)Antioxidants are important and necessary food ADDITIVES. 2)Antioxidants help in food preservation by retarding the action of oxygen on food. 3)Antioxidants are more reactive towards oxygen than the food material which they protecting. 4)The most familiar anti oxidants are butylated hydroxy toluene (BHT) and Butylated hydroxy anisole(BHA).` 5) The ADDITION of BHA to butter increases its shelf life from months to years. 6)BHT and BHA along with CITRIC acid are added to produce more antioxidant effect. 7)`SO_(2)` and sulphits are useful anti oxidants for wine and beer,sugar syrups and cut,peeled (or) dried fruits and vegetables.
Discussion
3844.

Write one chemical reaction equation to show that conc. H_2SO_4 is a strong oxidising agent.

Answer»

SOLUTION :`C + H_2SO_4 ( CONC. ) OVERSET(DELTA)to CO_2 + 2SO_2 + 2H_2O`
Discussion
3845.

Which one of the following is not a state function?

Answer»

Enthalpy
Entropy
Work
Free energy

Solution :Macroscopic PROPERTIES which DETERMINE the STATE of a system are referred as state functions. The CHANGE in the state properties depends only UPON the initial and final state of the system. All thermodynamics functions are state functions except work and heat.
Discussion
3846.

The stability order of following carbocation is

Answer»

i GT II gt IV gt III
iii gt i gt ii gt iv
iv gt ii gt iiigt i
ii gt iv gt iii gt i

ANSWER :D
Discussion
3847.

Which electrolyte is used in Leclanche cell?

Answer»

`ZnSO_4 + CuSO_4`
`NH_4Cl+ ZnCl_2`
`NACL + CuSO_4`
`MnSO_4 - MnO_2`

ANSWER :B
Discussion
3848.

Which of the following pairs will evolve H_(2) gas ?

Answer»

Iron and DIL. `H_(2)SO_(4)`
COPPER and dil. HC1
Sodium and ethyl alcohol
Iron and steam

Solution :Copper does not GIVE `H_(2)` with dil HCL.
Discussion
3849.

Write the structure of the organic compound which reacts with water to yield methanol and hydrogen peroxide.

Answer»

SOLUTION :
Discussion
3850.

When CuSO_4 is mixed with excess of NH_3, a deep blue coloured solution is obtained.Give the oxidation number and coordination number of the central metal atom of the deep blue coloured compound.

Answer»

SOLUTION :Co ordination NUMBER is 4 OXIDATION numer is +2
Discussion