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10151.

The term invert sugar refers to an equimolar mixture of

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D-GLUCOSE and D-galactose
D-glucose and D-fructose
D-glucose and D-mannose
D-glucose and D-ribose

Solution :Since SUCROSE is dextrorotatory while HYDROLYSIS product of sucrose, having equimolar MIXTURE of glucose and fructose, is leovorotatory. Hence the hydrolysed product of sucrose is known as inversion.
Discussion
10152.

Which of the following monomers can unergoes radical, cationic as well as anionic polymerisation with equal ease?

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`CH_(3)- UNDERSET(CH_3) underset( |)C-=CH_(2)`
`C_6H_5-CH=CH_2`
`CH_2=CH-CN`
`CH_2=CH_2`

ANSWER :B
Discussion
10153.

Which solutionis used by policeto test that a person is drunk ? How is it done ?

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Solution :Acidified potassium DICHROMATE solution is used which has organge colour. The PERSON is asked to breathe into the solution taken in a test tube. If the person has consumed alcohol, the organge colour will change into GREEN colour due to oxidation of alcohol and reduction of acidified potassium dichromateto green COLOURED chromium SULPHATE.
Discussion
10154.

What is the maximum covalency of oxygen ? Give examples.

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Solution :Oxygen usually forms two bonds. Its valency cannot be expanded DUE to lack of VALENCE d orbitals. However, the maximum COVALENCY of oxygen is three, due to an additional dative bond formed by oxygen using one of its lone PAIRS.
Hydronium ion, `H_(3)O^(+)` has two COVALENT bonds and one coordinate covalent bond formed by oxygen atom. Oxonium ion, `(C_(2)H_(5))OH^(+)` also has three bonds formed by oxygen.
Discussion
10155.

The units of K_(b) are

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`K mol^(-1)kg^(-1)`
`K kg^(-1)`mol
K Kg `mol^(-1)`
`Kg mol^(-1)`

Answer :A::C
Discussion
10156.

Which of the following option is the correct order for the basic strength of metallic hydroxides?

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`AL(OH)_(3) lt Lu(OH)_(3) lt Ce(OH)_(3) lt CA(OH)_(2)`
`Ca(OH)_(2) lt Al(OH)_(3) lt Lu(OH)_(3) lt Ce(OH)_(3)`
`Lu(OH)_(3) lt Ce(OH)_(3) lt Al(OH)_(3) lt Ca(OH)_(2)`
`Lu(OH)_(3) lt Ce(OH)_(3) lt Ca(OH)_(2) lt Al(OH)_(3)`

ANSWER :A
Discussion
10157.

Which of the following processes is NOT used to preserve the food?

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Irradiation
ADDITION of SALTS
Addition of HEAT
Hydration

Solution :On hydration ENZYMATIC action on food increases.
Discussion
10158.

Which acid of each pair shown here would you expect to be stronger ? CH_(2)FCH_(2)CH_(2)CO_(2)H or CH_(3)CHFCH_(2)CO_(2)H.

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SOLUTION :`CH_(3)-overset(F)overset(|)CH-CH_(2)COOH`.
Discussion
10159.

Write the reaaction PCl_(5) with water.

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SOLUTION :`PCl_(5)_ 4H_(2)O overset(Delta)to HPO_(4)+5HCl`
Discussion
10160.

Which alkene on ozonolysis gives CH_3CH_2CHO and CH_3undersetOunderset"||"C CH_3

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`CH_3CH_2CH=CHCH_2CH_3`
`CH_3CH_2CH=CHCH_3`
`CH_3-underset(CH_3)underset|C=CHCH_3`

SOLUTION :
Discussion
10161.

Which of the follwinghas the highest boilingpoint?

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`C_(3)H_(7) Cl`
`C_(4) H_(9) Cl`
`CH_(3)CH(CH_(3))CH_(2)Cl`
`(CH_(3))_(3)C - Cl`

Solution :More the number of `C` atoms (highmolecular MASS) and HIGHER the boiling POINTS.
Discussion
10162.

Which one of the following is the heterocyclic compound?

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PYRENE
Thiophene
Phenol
ANILINE

ANSWER :B
Discussion
10163.

What is the role of builder in synthetic detergents ?

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Solution :It removes hardness producing ion VIZ `CA^(2+) & MG^(2-)` ion.
Discussion
10164.

Which of the followingstatementis false ?

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Raoult's law STATES that vapour PRESSURE of COMPONENT over a solutiin is propertional to its mole fraction.
Osmotic pressure is given by the expression `PI=`MRT where,is molarity
The correct order of osmotic pressures of `0.01` M aqueous solution of each compound is `BaCl_(2) gt KCl gt CH_(3) COOHgt` sucrose.
Two sucrose solutions of same molarity prepared in different solvents will have same freezingpoint depressions.

Answer :D
Discussion
10165.

Which of the following compounds with H_2SO_4 will act as an acid ?

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`CH_(3)COOH`
`HClO_(4)`
`H_(2)O`
`HNO_(3)`

SOLUTION :The order of acidic strength is :
`HClO_4 gtH_2SO_4 gtHNO_3 gtHCl`Stability of conjugate base : `CI^(-) ltNO_3 lt SO_(4)^(2-) lt ClO_(4)^(-)`
Discussion
10166.

Which is dibasic ?

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Orthophosphoric ACID
Pyrophosphoric acid
Orthophosphorus acid
Hypophosphorus acid

ANSWER :A::C::D
Discussion
10167.

Which of the following is least basic ?

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ANILINE
p-Methyl aniline
Diphenylamine
Triphenyl amine

Answer :C
Discussion
10168.

Which of the following transformation least energy is required?

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`F_((g))^(-)to F_((g))+e^(-)`
`P_((g))^(-) to P_((g))+e^(-)`
`S_((g))^(-) to S_((g))+e^(-)`
`Cl_((g))^(-) to Cl_((g))+e^(-)`

Solution :If we consider the oppsite process:
`P_((g))+e^(-) to P_((g))^(-),""DeltaH_(2)`
Order of energy releases is `:DeltaH_(4) GT DeltaH_(1) gt DeltaH_(3) gt DeltaH_(2)`.
so, `P_((g))^(-) to P_((g))+e^(-),`Requires least energy.
Discussion
10169.

Whiuch of the following elements has the lowest electronegativity ?

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P
N
O
F

Answer :A
Discussion
10170.

Which one of the following is wrong about molecularity of a reaction?

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It may be whole NUMBER or fractional.
It is calculated from reaction MECHANISM.
It is the number of MOLECULES of the reactants TAKING part in a single step chemical reaction.
It is always equal to the ORDER of elementary reaction.

Solution :Molecularity cannot be fractional.
Discussion
10171.

There are no S-S bond in

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`S_(2) O_(4)^(2-)`
`S_(2)O_(5)^(2-)`
`S_(2)O_(3)^(2-)`
`S_(2)O_(7)^(2-)`

ANSWER :D
Discussion
10172.

Which of the following are organometallic compounds?

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`Zn(CN)_(2)`
`NI(CO)_(4)`
`K[PtCl_(3)(C_(2)H_(5))]`
`NiCO_(3)`

Answer :B::C
Discussion
10173.

Which of the following phase diagram is/are not correct for water?

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ANSWER :B::C::D
Discussion
10174.

What is false in case of boric acid (H_3BO_3) ?

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It is soluble in hot water
It acts as a TRIBASIC acid
It has a planar structure
It acts as a MONOBASIC acid

Answer :B
Discussion
10175.

The structure of paracetamol is

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ANSWER :B
Discussion
10176.

When glycerol is heated with KHSO_(4)

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`CH_(2)=CH-CH_(3)`
`CH_(2)=CH-CH_(2)OH`
`CH_(2)=CH-CHO`
`CH_(2)=C=CH_(2)`

SOLUTION :
Discussion
10177.

Which of the given compounds on reacting with HBr formes the same product in presence and absence of peroxide

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`CH_3CH=CH_2`
`(CH_3)_2C=CH_2`

ANSWER :C
Discussion
10178.

Whichof the followingamineswillnot givesefferesecen withHNO_(2)

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`CH_(3)NH_(2)`
`C_(2)H_(5)NH_(2)`
`(CH_(3))_(2)NH`
`(CH_(3))_(2)NH`

Answer :D
Discussion
10179.

Which among the following reactions is an example of pseudo first order reaction?

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Inversion of cane sugar
Decomposition of `H_(2)O_(2)`
Conversion of cyclopropane to propene
Decomposition of `N_(2)O_(5)`

Solution :The hydrolysis of `C_(12)H_(22)O_(11)` by using dil HCl is PSEUDO first ORDER reaction.
`C_(12)H_(22)O_(11) + H_(2)O overset("dil" HCl) to C_(6)H_(12) O_(6) + C_(6)H_(12)O`
In thisconc. Of `H_(2)O` is taken as constant HENCE rate law expression is `R=k[C_(12) H_(22)O_(11)]` only.
Discussion
10180.

When the value of the azimuthal quantum number is 3, the magnetic quantum number can have values

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`+1,-1`
`+1,0,-1`
`+2,+1,0,-1,-2`
`+3,+2,+1,0, -1,-2,-3`.

Solution :For a given value of l, m = - l to + l including .0..
Discussion
10181.

What are the concentration of H_(3) O^(+), HS^(-)and s^(2-) is 0.01MH_(2) Ssolution, given H_(2) S + H_(2) hArr H_(3) O^(+) + HS^(-), K_(a_(1)) = 1.1 xx 10^(-7) HS^(-) + H_(2) O hArr H_(3) O^(+) + S^(-) , K_(a_(2)) = 1.0 xx 10^(- 34 )

Answer»

Solution :By ostwald DILUTION law, `[H_(3) O^(+)]` and `[HS^(-)]` due to first STEP IONIZATION are `[H_(3) O^(+)]= [HS^(-)] = sqrt( Ka_(1) C )`
`= sqrt(1.1 XX 10^(-7) xx 0.1) =1 xx 10^(-4) M `
For second step ionization `HS^(-) + H_(2) O rarr H_(3) O^(+) + S^(2-)`
Since `K_(a_(2)) lt lt lt K_(a)` hence ionization is very-very small and `[HS^(-)]` remains constant
`K_(a_(2)) = ([ H_(3) O^(+)][S^(-2)])/( [HS^(-)])`
`:. 1. 0 xx 10^(-14) = ( 1.0 xx 10^(-14) [ S^(2-)])/(1.0 xx 10^(-4))`
`:. [S^(2-) ] = 1.0 xx 10^(-14) M `
Discussion
10182.

What is the product of the following reaction

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Both A and B
None

Solution :NA
Discussion
10183.

Which of the following is most effective electrolyte in causing the flocculation of a negatively arsenious sulphide sol?

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KCI
`MgCl_(2), `
`K_(3) [FE (CN)_(6)]`
`AlCl_(3).`

SOLUTION :The catin having higher charge `, al ^(3+)`
Discussion
10184.

Which of the following compounds will react faster in S_(N^(1)). Reaction and why?

Answer»

SOLUTION :.
Discussion
10185.

Which kind of isomerism is shown by the complex [Co(NH_(3))_(5)(ONO)]SO_(4) ? (P) Ionisation isomerism (Q) Linkage isomerism (R ) Geometrical isomerism (S) Optical isomerism

Answer»

<P>P, Q, R and S are correct
P, R and S are correct only
P and Q are correct only
Q, R and S are correct only

Solution :`[Ma_(5)b]` does not SHOW GI and OI.
Discussion
10186.

The shape of Fe(CO)_(5) complexis :

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Octahedral with one LONE PAIR
Square pyramidal
Trigonal bipyramidal
Octahedral with TWO lone pairs

Answer :C
Discussion
10187.

Which statement (s ) are correct?

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Activated complec has no physical, individual existance
Activated complex can be isolated
Activated complex maintains EQUILIBRIUM with reactants
AVERAGE ENERGY of activated complex can be LESS than that of products.

Solution :Average energy of activated complex is greater than the energy of products & Reactants.
Discussion
10188.

Which of the following is correct representation of reaction of acidified permanganate solution with sulphurous acid ?

Answer»

`2MnO_4^(-)+5SO_3^(2-)+6H^(+)to5SO_4^(2-)+2MN^(2+)+3H_2O`
`MnO_4^(-)+SO_3^(2-)+2H_2OtoS+Mn^(2+)4H^(+)`
`2MnO_4^(-)+5SO_3^(2-)+2H_2Oto4SO_4^(2-)+S+2Mn^(2+0+4H^(+)`
`3MnO_4^(-)+2SO_3^(2-)+2H_2O to 2S+3Mn^(2+)+4H^(+)`

ANSWER :A
Discussion
10189.

What is the mass of one mole electrons in kg?

Answer»

SOLUTION :`5.5xx10^(-7)`
Discussion
10190.

The volume of H_(2)liberated at 273K and 4 atm pressure by the passage of 1 faraday of electricitythrough HCl solution is

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`4.48 dm^(3)`
`5.6 dm^(3)`
`2.8 dm^(3)`
`112 dm^(3)`

Solution :1F=1 mole of `E^(-)-=1` mole of H ATOM
`-=1//2" mole of "H_2 = 11.2 dm^3 of H_2`
Now,`(P_1V_1)/(T_1) =(P_0V_0)/(T_0)`
`therefore (4xxV_1)/(273)=(1xx11.2)/(273) therefore (4V_1)/(1) =(11.2)/(1)`
`therefore V_1 =2.8 dm^3`
Discussion
10191.

Which of the following statements is (are) correct ?

Answer»

Antimony on reaction with CONC. `HNO_(3)` gives antimonic acid
Manganese on reaction with COLD and dilute `HNO_(3)` gives `NO_(2)` gas
`HNO_(2)` disproportionate to given `HNO_(3) and NO`
`HNO_(3)` on reaction with `P_(4)O_(10) " given " N_(2)O_(5)`

Answer :A::C::D
Discussion
10192.

What isthe effectofdenaturationonthestructure ofproteins ?

Answer»

SOLUTION :There isnochangein theprimarystructureofproteinbuttheiris changeinthesecondary andtertiarystructureofproteins.
Discussion
10193.

Why a person suffering from high blood pressure is advised to take minimum quantity of common salt?

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Solution :OSMOTIC PRESSURE is directly proportional to the concentration of the solutes. Our body fluid contains a number of solutes. On taking large AMOUNT of common salt, `Na^(+)` and `Cl^(-)` ions enter into the body fluid THEREBY raising the concentration of the solutes. As a results, osmotic pressure increases which may RAPTURE the blood cells.
Discussion
10194.

Which reagent is used to reduce acid or ester ?

Answer»

`NaBH_(4)`
`BH_(3)`
`LiAIH_(4)`
All of these

Solution :`LiAIH_(4)` is STRONG reducing AGENT.
Discussion
10195.

{:(underset(("Lab Test"))("Column 1"),underset(("Groups"))("Column 2"),underset(("No . of Stereoisomers"))("Column 3")),((I)"Tollen's Reagent",(i)"Aldehyde",(P)8),((II)"2,4DNP Test",(ii)alpha-"hydroxy ketone",(Q)16),((III)"Schiff Reagent",(iii)"Acetal linkage",(R)4),((IV)NaHSO_3 "Test",(iv)"Glycosidic linkage",(S)2):} A compound (Z), epimer of D-glucose at C_2.Which of the following will be correct for Z.

Answer»

(I)(iv)(Q)
(I)(II)(P)
(I)(i)(Q)
(III)(ii)(S)

SOLUTION :
Discussion
10196.

{:(underset(("Lab Test"))("Column 1"),underset(("Groups"))("Column 2"),underset(("No . of Stereoisomers"))("Column 3")),((I)"Tollen's Reagent",(i)"Aldehyde",(P)8),((II)"2,4DNP Test",(ii)alpha-"hydroxy ketone",(Q)16),((III)"Schiff Reagent",(iii)"Acetal linkage",(R)4),((IV)NaHSO_3 "Test",(iv)"Glycosidic linkage",(S)2):} A reducing sugar (X), monosaccharide, having formula C_6H_12O_6, does not give Br_(2)+H_2O test which will be correct for X.

Answer»

(I)(i)(Q)
(I)(ii)(P)
(I)(i)(S)
(I)(iii)(R)

Solution :
FRUCTOSE having KETONE FUNCTIONAL group AND3 chiral centres
TOTAL stereoisomers =`2^n implies 2^3=8`
Discussion
10197.

{:(underset(("Lab Test"))("Column 1"),underset(("Groups"))("Column 2"),underset(("No . of Stereoisomers"))("Column 3")),((I)"Tollen's Reagent",(i)"Aldehyde",(P)8),((II)"2,4DNP Test",(ii)alpha-"hydroxy ketone",(Q)16),((III)"Schiff Reagent",(iii)"Acetal linkage",(R)4),((IV)NaHSO_3 "Test",(iv)"Glycosidic linkage",(S)2):} Which of the following will be true for D-Glucose.

Answer»

(I)(i)(Q)
(II)(i)(Q)
(I)(ii)(Q)
(I)(iv)(P)

Solution :
Aldehyde GROUP is present in D-glucose and having four CHIRAL centres
Total STEREOISOMERS =`2^n IMPLIES 2^4=16`
Discussion
10198.

Which of the following statement about anhydrous aluminium chloride is correct

Answer»

It EXISTS as `AlCl_(3)` molecules
It is not easily hydrolysed
It sublimes at `100^(@)C` under vacuum
It is STRONG lewis base

Solution :`AlCl_(3)` exists as a dimer `(Al_(2)Cl_(6))`. It is a strong Lewis acid as Al has an incomplete octet and has a tendency to gain electrons. `AlCl_(3)` undergoes hydrolysis easily and FORMS an acidic solution.
`AlCl_3 +3H_(2)O to Al(OH)_(3) + 3HCl`
option (c) is TRUE that `AlCl_(3)` sublimes at `100^(@)C` under vaccume
Discussion
10199.

Which of the following electronic configuration is/are wrong? 1. 1s^2 2s^(2)2p_(x)^(2)2p_(y)^(1) (for nitrogen) 2. 1s^(2)2s^(2)2p_(x)^(2)2p_(y)^(1)2p_(z)^(1)(for oxygen) 3. 1s^2 2s^2 2p^6 3s^(2)3p^(6)3d^(5)4s^(1) (for chromium) 4. 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(6)4s^(2) (for iron)

Answer»

1 and 3
3 and 4
1 only
2 only

Answer :C
Discussion
10200.

What are essential amino acids? Give an example.

Answer»

Solution :AMINO acids which the body cannot SYNTHESIZE are called ESSENTIAL amino acids. For example,phenylalar valine, leucine, etc., Therefore, these must be SUPPLIED in diet.
Discussion