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9451.

Which of the following compounds have approximately the same dipole moment?

Answer»




Solution :In option (d), the dipole moment of the two para Cl ATOMS CANCEL each other, THEREFORE, its dipole moment is the same as that of 1,3-dichlorobenzene. But the dipole moment of 1,3-dichlorobenzene is the same as that of chlorobenzene due to parallelogram law of FORCES.
.
Discussion
9452.

Which of the following is an insulator ?

Answer»

Graphite
Aluminium
DIAMOND
Silicon

SOLUTION :Diamond is an INSULATOR .
Discussion
9453.

Which of the following is /are false ?

Answer»

1M NaCl solution has HIGHER freezing point than 1 M glucose solution
1M glucose solution has same boiling point as 1M glucose solution
Molecular WEIGHT ACETIC acid in benzene will be double than expected
Van't Hoff factor `I GT 1` if SOLTE undergoes association

Answer :A
Discussion
9454.

Which one of the following reactions of xenon compounds is not feasible ?

Answer»

`XeO_(3) + 6HF to XeF_(6) + 3H_(2)O`
`3XeF_(4) + 6H_(2)O to 2Xe + XeO_(3) + 12HF + 1.5O_(2)`
`2XeF_(2) + 2H_(2)O to 2Xe + 4HF + O_(2)`
`XeF_(6) + RbF to Rb [XeF_(7)]`

ANSWER :A
Discussion
9455.

Which among the following is likely to have Schottky defect.

Answer»

agci
naci
TICI
`mgci_(2)`

Answer :B
Discussion
9456.

When chlorobenzene is treated with NH_(3) in presence of Cu_(2)O in xylene at 570K. The product obtained is

Answer»

Benzylamine
DIAZONIUM salt
Schiff's base
Aniline

Solution :`2C_(6)H_(5)Cl+2NH_(3)UNDERSET("In xylene 570K")RARR`
`C_(6)H_(5)NH_(2)+Cu_(2)Cl_(2)+H_(2)O`
Discussion
9457.

The time required to decompose half of the reactant for an nth-order reaction is inversely proportional to (a is the initial concentration)

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`a^(N)`
`a^(n-2)`
`a^(n-1)`
`a^(n+1)`

ANSWER :C
Discussion
9458.

What would be the value of van't Hoff factor for dilute aqueous solution of K_(2)SO_(4)?

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SOLUTION :`K_(2)SO_(4) RARR 2K^(+) +SO_(4)^(2-)""therefore""i=3.`
Discussion
9459.

Which of the following reaction is/are possible

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`CH_3-CHClCH_2NEt_2overset(OH^(THETA))toCH_3CH(Net_2)CH_2-OH`
ETHER `CH_3-undersetunderset(OH)(|)CH-CH_2-SE t or CH_3CH(sET)CH_2OHoverset(HCL)toCH_3CHClClCH_2SEt`

Solution :
Discussion
9460.

What are enantiomers ?

Answer»

Solution :A PAIR of optically ACTIVE isomers which ARC non-super IMPOSABLE mirror IMAGES of each other.
Discussion
9461.

Wash or wort possesse ----- percentage of ethyl alcohol

Answer»

0.95
1
0.669
`6 - 10%`

ANSWER :D
Discussion
9462.

What we can say about condensation polymer of polyamide category. Write down any two example of it.

Answer»

Solution :These polymers possessing AMIDE linkages are important examples of synthetic fibres and are TERMED as nylons.
The GENERAL method of preparation consists of the condensation polymerization of diamines with dicarboxylic acids or condensation of amino acids or their lactams.
Example : (i) NYLON-6,6
(ii) Nylon -6
Discussion
9463.

Which statement are true about osmotic pressure (pi), volume (V) and temperature (T)? {:("Solution (A)","Solution (B)"),(FeCl_(3),K_(4)Fe(CN)_(6)):}

Answer»

`pi prop(1)/(V)` if T is CONSTANT
`pi prop T` if V is constant
`pi prop V` if T is constant
`pi V` is constant if T is constant.

Solution :`pi=(N)/(V)Rt.`
Discussion
9464.

Which of the following salt on dissolution in water absorbs heat

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`NH_(4)Cl`
`CaO`
`Na_(2)SO_(4)`
`Na_(2)CO_(3)`

Solution :Generally ENTHALPY of solution is positive but here in this question, the three other compounds have -ve enthalpy of solution.
Discussion
9465.

What is TEL ? Write its use.

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SOLUTION :TETRA ETHYL lead (TEL). It is widely used as an ANTIKNOCK compound.
Discussion
9466.

Which of the following does not provide any calories and stable even at cooking temperature ?

Answer»

SURCOSE
Sucralose
Aspartame
Sodium benzoaate

Solution :Sucralose is more STABLE even at COOKING TEMPERATURE
Discussion
9467.

Which of the following aqueous solution has the highest freezing point ?

Answer»

0.1 M NaCl
0.1 M SUCROSE
`0.01 M Na_(2)SO_(4)`
0.01 M NaCl

Answer :D
Discussion
9468.

When vapours of an alcohol are passed over hot reduced copper, it gives an alkene. The alcohol is

Answer»

primary
secondary
tertiary
none of these.

Solution : Tertiary alcohols when PASSED over HEATED copper undergo DEHYDRATION to GIVE alkenes.
Discussion
9469.

Which of the following alcohols on dehydration with conc. H_(2)SO_(4) give but-2-ene?

Answer»

2-Methylpropan-2-ol
Butan-1-o
2-Methylpropan-1-ol
Butan-2-ol

Solution :`CH_(3)underset(OH)underset(|)overset(CH_(3))overset(|)C CH_(3)overset(H^(+))toCH_(3)-underset(+)overset(CH_(3))overset(|)C-CH_(3)tounderset("2-Methylpropene")(CH_(3))-overset(CH_(3))overset(|)C=CH_(2)`
`CH_(3)CH_(2)CH_(2)CH_(2)OHoverset(H^(+))toCH_(3)underset((1^(@)))(CH_(2))CH_(2)CH_(2)^(+)overset(H^(-)"shift")toCH_(2)underset((2^(@)))(CH_(2))underset(+)CHCH_(3)toCH_(3)underset("But-2-ene")(CH=CHCH_(3))`
`CH_(3)CH_(2)underset(OH)underset(|)CHCH_(2)OHoverset(H^+)toCH_(3)underset((1^(@)))underset(CH_(3))underset(|)(CH)-CH_(2)^(+)overset(H^(-)"shift")toCH_(3)-underset(CH_(3))underset(|)overset(+)C-CH_(3)toCH_(3)-underset("2-Methylpropene")underset(CH_(3))underset(|)C=CH_(2)`
`CH_(3)CH_(2)underset(OH)CHCH_(3)overset(H^(+))toCH_(3)CH_(2)underset(+)CHCH_(3)toCH_(3)underset("But-2-ene")(CH)=CHCH_(3)`
Discussion
9470.

Which bond has the greatest polarity:

Answer»

H-Cl
H-Br
H-I
H-F

Answer :D
Discussion
9471.

What is oxidation state of Fe in fools gold

Answer»


SOLUTION :Fols gold is `CuFeS_(2)` OXIDATION STATE of Fe in FOOLS gold is +2
Discussion
9472.

Which of the following drugs reduces fever?

Answer»

Analgesic
Antipyretic
Antibiotic
Tranquilliser

Answer :B
Discussion
9473.

Which of the following on treating with zinc gives 2–butene?

Answer»

`CH_(3)-"CH(BR)-CH(Br)"-CH_(3)`
`CH_(3)CHBr_(2)`
Both of these
None of these

Answer :C
Discussion
9474.

What is polymer ?

Answer»

Micro MOLECULES
MACRO molecules
MEDIUM molecules
NONE of these

SOLUTION :Macro molecules
Discussion
9475.

Write the structure of the major organic product in each of the following reaction : CH_(3)CH_(2)CH = CH_(2) + HBr overset("peroxide") to

Answer»

SOLUTION :REACTIONS giving the structure of main organic product, are as under :
`underset("But -1-ene") (CH_(3)CH_(2)CH ) = CH_(2) + HBr underset(" Anti-Markovnikov addition") OVERSET("PEROXIDE") to underset("1-Bromobutane") (CH_(3)CH_(2)CH_(2)CH_(2)Br) `
Discussion
9476.

What do we call those carbohydrates that give Fehling solution test?

Answer»

SOLUTION :REDUCING SUGARS
Discussion
9477.

This reaction takes place between two molecules of esters (same or different). One ester should have atleast one alpha-hydrogen atom which behaves as a reagent. The reaction is catalyzed by strong bas elike C_(2)H_(5)barONa^(+) in presence of C_(2)H_(5)OH. The product of this reaction is beta-ketoster: Which of the following esters will undergo Claisen condensation to form acetoacetic ester ?

Answer»

`CH_(3)COOC_(2)H_(5)`
`C_(6)H_(5)COOC_(2)H_(5)`
`HCOOC_(2)H_(5)`
None of these

Answer :A
Discussion
9478.

This reaction takes place between two molecules of esters (same or different). One ester should have atleast one alpha-hydrogen atom which behaves as a reagent. The reaction is catalyzed by strong bas elike C_(2)H_(5)barONa^(+) in presence of C_(2)H_(5)OH. The product of this reaction is beta-ketoster: When one ester has alpha-hydrogen and other has no alpha-hydrogen then Claisen condensation will give:

Answer»

1 Product molecule
2 product MOLECULES
3 product molecules
4 product molecules

ANSWER :A
Discussion
9479.

What are fillers and what role these fillers play in soap ?

Answer»

Solution :Substances which are added to soaps to change their properties in order to make them more useful for a PARTICULAR application, are called fillers. Some important EXAMPLES are given below,
(i) SODIUM rosinate, sodium silicate, borax and sodium CARBONATE are added to laundry soap to increase their lather forming ability
(ii) glycerol is added to shaving soaps to prevent them from rapid drying.
(iii) In medicated soaps, substances of medicinal values are added.
Discussion
9480.

This reaction takes place between two molecules of esters (same or different). One ester should have atleast one alpha-hydrogen atom which behaves as a reagent. The reaction is catalyzed by strong bas elike C_(2)H_(5)barONa^(+) in presence of C_(2)H_(5)OH. The product of this reaction is beta-ketoster: When two esters having alpha-hydrogen are subjected to Claisen condensation then we get:

Answer»

4 cross PRODUCTS
2 simple and 2 cross products
3 cross products and 1 simple products
4 simple products

ANSWER :B
Discussion
9481.

Whattypesoforesareroasted ?

Answer»

SOLUTION :Sulphideores areroastedto convertthem intotheir correspondingoxidessinceoxidesaremoreeasilyreducedto metalsthansulphides.
Discussion
9482.

What is the chemical composition of Nicol's prism?

Answer»

`Al_(2)O_(3)`
`CaSO_(4)`
`CaCO_(3)`
`Na_(3)AIF_(6)`

Solution :Nicol prism is MADE from `CaCO_(3)`. It is also KNOWN as calcite or ice LAND spar.
Discussion
9483.

The resistance of a conductivity cell containing 0.001 M KCl solution at 298 K is 1500 Omega. What is the cell constant if conductivity of 0.001 M KCl solution at 298 K is 0.146xx10^(-3)S" "cm^(-1).

Answer»

SOLUTION :* Given,
CONDUCTIVITY, `k=0.146xx10^(-3)" S "cm^(-1)`
Resistance, `R=1500Omega`
`THEREFORE` Cell CONSTANT=`kxxR`
`=0.146xx10^(-3)xx1500`
`=0.219" S "cm^(-1)`
`=0.219cm^(-1). . . (becauseS=Omega^(-1))`
Discussion
9484.

Which linkage binds the monosaccharide units in polysaccharides?

Answer»

SOLUTION :GLYCOSIDIC
Discussion
9485.

In the metallurgy of aluminium,

Answer»

SOLUTION :(i) Aluminium is OBTAINED by electrometallurgical process by CARRYING out an electrolysis of fused alumina `Al_(2)O_(3)` in cryolite `Na_(3)AlF_(6)`.
(ii) This MIXTURE hasa very high melting point and relatively less electrical CONDUCTIVITY.
(iii) To lower the melting point of the mixture and increase the electrical conductivity `CaF_(2)` is added.
Discussion
9486.

Using the data given below find out the strongest reducing agent E_(Cr_(2)O_(7)^(2-))^(@)Cr^(3+)=1.33V," "E_(Cl_(2)//Cl^(-))^(@)=1.36V E_(MnO_(4)^(-))^(@)//Mn^(2+)=1.51V, E_(Cr^(3+)//Cr)^(@)=-0.74V

Answer»

CR
`Cr^(3+)`
`Cl^(-)`
`MN^(2+)`

Answer :A
Discussion
9487.

This reaction takes place between two molecules of esters (same or different). One ester should have atleast one alpha-hydrogen atom which behaves as a reagent. The reaction is catalyzed by strong bas elike C_(2)H_(5)barONa^(+) in presence of C_(2)H_(5)OH. The product of this reaction is beta-ketoster: Which among the following is the most reactive towards Claisen condensation ?

Answer»

`HCOOC_(2)H_(5)`
`CH_(3)COOC_(2)H_(5)`
`C_(2)H_(5)COOC_(2)H_(5)`
`HCOOCH_(3)`

Answer :B
Discussion
9488.

The total number of unpaired electrons in Rf (Z=104) are

Answer»

2
zero
3
5

Solution :Ha: `5f^(14)6D^(3)7s^(2)`, THREE UNPAIRED electrons.
Discussion
9489.

Write the possible isomers for the formula C_2H_4O, write their IUPAC names and structures.

Answer»

Solution :`C_4H_10O- 7` Isomers
1. `CH_3-CH_2-CH_2-CH_2OH`-BUTAN - 1 - ol
2. `CH_3- underset(OH)underset(|)CH-CH_2 - CH_3`- Butan -2 -AL
3. `CH_3 -underset(CH_3)underset(|)CH - CH_2OH`- 2-methyl propan - 1 -ol
4. `CH_3 - underset(CH_3)underset(|)overset(CH_3)overset(|)C - OH`- 2 - methyl propan - 2-ol
5. `CH_3 - CH_2 - O - CH_2 - CH_3`- Ethoxy ethane
6. `CH_3 - CH_2 - CH_2 - O - CH_3`-1-methoxy propane
7. `CH_3- overset(CH_3)overset(|)CH - O - CH_3`- 2 methoxy propane
Discussion
9490.

Which of the followin compounds will show optical activity?

Answer»




ANSWER :C::D
Discussion
9491.

This reaction takes place between two molecules of esters (same or different). One ester should have atleast one alpha-hydrogen atom which behaves as a reagent. The reaction is catalyzed by strong bas elike C_(2)H_(5)barONa^(+) in presence of C_(2)H_(5)OH. The product of this reaction is beta-ketoster: Which of the following esters will not undergo classin condensation?

Answer»

`CH_(3)-overset(O)overset(||)C-OC_(2)H_(5)`
`CH_(3)CH_(2)-overset(O)overset(||)C-OCH_(3)`
`C_(2)H_(5)-overset(O)overset(||)C-OC_(2)H_(5)`
`C_(6)H_(5)-COOC_(2)H_(5)`

ANSWER :D
Discussion
9492.

The unit cell in a body centred cubic lattice is given inthe figure. Each sphere has a radius 'r' and the cube has side 'a'. What fraction of the total cube volume is empty?

Answer»

`1-8/3 (pir^3)/a^3`
`8/3 (pir^3)/a^3`
`r/a`
`2-4/3 (pir^3)/a^3`

Solution :FRACTION of OCCUPIED space
`="Occupied volume"/"TOTAL volume" =8/3 (pir^3)/a^3`
Fraction of EMPTY space = `1-8/3 (pir^3)/a^3`
Discussion
9493.

Write down the IUPAC names of the following compounds :- (A) CH_(3)-underset(C_(2)H_(5))underset(|)(CH)-overset(CH_(3))overset(|)(CH)-underset(OH)underset(|)(CH)-CH_(3)(B)CH_(2)=CH-underset(CH_(2)-OH)underset(|)(CH)-CH_(2)-CN(C) CH_(3)-underset(CH_(3))underset(|)overset(CH_(2)CH_(3))overset(|)(C)-C(CH_(3))_(3)(D)CH_(3)-underset(CN)underset(|)(CH)-overset(CN)overset(|)(CH)-CH_(2)-CH_(3)(E)CH_(2)=CH-underset(C-=C-CH_(3))underset(|)(CH)-CH_(2)-CHO (F)(G)CH_(2)=CH-underset(CH_(3))underset(|)(CH)-C-=CH

Answer»


Answer :(A) 3, 4-Dimethyl hexan-2-ol
(B) 3-Hydroxy METHYL pent-4-enenitrile
(C ) 2, 2, 3, 3-Tetramethyl pentane
(D) 2-Ethyl-3-methyl butane-1, 4-dinitrile
(E) 3-Ethenyl hex-4-ynal
(F) 3, 3-Dibromo-1, 1, 1-trichloro propane
(G) 3-Methyl pent-1-en-4-yne
(H) 5-Methyl hex-2-yne
(I) 2-Hydroxy butanoic ACID
(J) 2-Ethyl-1,1-dimethyl cyclopropane
Discussion
9494.

Which one among the following pairs of ions cannot be separated by H_2 S in dilute hydrochloric acid?

Answer»

`Bi^(3+),SN^(4+)`
`Al^(3+),Hg^(2+)`
`Zn^(2+),Cu^(2+)`
`Ni^(2+),Cu^(2+)`

Solution :Both `Bi^(3+)` and `Sn^(4+)` are PRECIPITATED as SULPHIDE in the PRESENCE of dil. HCl
Discussion
9495.

Which is better reducing agent, C or CO at 710""^(@)C (983K)?

Answer»

Solution :Carbon monoxide is a BETTER reducing agent at `710""^(@)C` than carbon whereas carbon is a better reducing agent at higher temperatures (above 1123K). This can be explained on the basis of ELLINGHAM diagram. `triangleG-T` CURVE for `CO to CO_(2)` LIES below the curve for `C to CO_(2)` below `710""^(@)C (983 K)` but above 1123K, the two curves change their positions.
Discussion
9496.

Which one of the following is known as arrhenisus equation ?

Answer»

NATURE of the reactant
Concentration of the reactants
Surface AREA and TEMPERATURE
PRESSURE

ANSWER :D
Discussion
9497.

Which of the followinghasmore kb value ?

Answer»




SOLUTION :ELECTRON donatinggroupincreasesthe basicityof AMINES . Methylgroupincreasethe basicityof amines . Methylgroupis electrondonating .
Discussion
9498.

Which of the following pair of protein is globular protein ? P-keratin, Q-Insulin, R-myosin, S-albumin

Answer»

<P>P, R
Q, S
R,S
Q,S

Answer :D
Discussion
9499.

Which one of the following salt is most acidic in water

Answer»

`NiCl_(2)`
`BeCl_(2)`
`FeCl_(3)`
`AlCl_(3)`

Solution :`AlCl_(3)` on hydrolysis GIVE WEAK base and strong acidamong all.
Discussion
9500.

Which group will increase the electron density of Alcohol ?

Answer»

`- CH_(3)`
`- C_(2)H_(5)`
`- CH_(2)CH_(2)CH_(3)`
All of these

Solution :In alochol, the alkyl group LIKE, `-CH_(3), C_(2)H_(5)` are electron rich group and hence it INCREASE electron density of -OH-bond.
Discussion