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19651.

What happens to the solubility of a gas in a liquid on increasing temperature.

Answer»

SOLUTION :It DECREASES because the PROCESS is EXOTHERMIC.
Discussion
19652.

Which of the following is an anionic detergent .

Answer»

SODIUM STEARATE
sodium lauryl SULPHATE
cetyl TRIMETHYL AMMONIUM bromide
Glycerol oleate

Answer :B
Discussion
19653.

Which of the oxide shows appearance like metallic copper ?

Answer»

`TiO_(2)`
`CrO_(2)`
`ReO_(3)`
`VO_(2)`

ANSWER :C
Discussion
19654.

When acetone undergoes reduction in presence of Zn -HCl / Hg, it is known as

Answer»

WOLF Kishner's REDUCTION
Rosenmund's reduction
Cleammanson's reaction
Gatterman's reaction

Answer :C
Discussion
19655.

What happens when the bond formed between an enzyme and an inhibitor is a strong covalent bond ?

Answer»

Solution :If a strong covalent bond is FORMED between the enzyme and the inhibitor which cannot be broken EASILY then the enzyme is blocked permanently. The body then degrades the enzyme-inhibitor COMPLEX and SYNTHESISES the NEW enzyme.
Discussion
19656.

The reduction potential is the tendency of an eleCtrode to

Answer»

SOLUTION pressure
get oxidized
lose electrons
accept electrons

Solution :REDUCTION POTENTIAL is DUE to reduction REACTION.
Discussion
19657.

Use of which of the following solvent in dry cleaning will result in less harm to ground water ?

Answer»

`Cl_(2)C=C Cl_(2)`
LIQUID `CO_(2)`
`H_(2)O_(2)`
NONE of these

Solution :Replacement of earlier used tetra chloroethene as solvent for dry cleaning by liquid `CO_(2)` RESULTS in less harm to ground water.
Discussion
19658.

Which of the following is an analgesic?

Answer»

STREPTOMYCIN
Chloromycetin
ASPRIN
Penicillin

SOLUTION :Asprin
Discussion
19659.

Two half cell reactions are given as : (i) Fe_(aq)^(2+)+2e^(-) to Fe_((s)),E^(@)=-0.44" V " (ii) 2H_((aq))^(+)+(1)/(2)O_(2)(g)+2e^(-) to H_(2)O(l),E^(@)=+1.23" V " The E^(@) for the reaction Fe_(s)+2H^(+)+(1)/(2)O_(2)(g) to Fe_(aq)^(2+)+H_(2)O_(l) is

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`+1.67" V "`
`-1.67" V "`
`+0.79" V "`
`-0.79" V "`

Solution :(a) Subtract EQUATION (i) from equation (ii) to GET equation (III) `E^(@)=(+1.23)-(-0.44)=+1.67" V "`.
Discussion
19660.

Which one of the following reactions involves disproportionation ?

Answer»

<P>`2H_(2)SO_(4)+CutoCuSO_(4)+2H_(2)O+SO_(2)`
`As_(2)O_(3)+3H_(2)StoAs_(2)S_(3)+3H_(2)O`
`2KOH+Cl_(2)toKCl+KOCl+H_(2)O`
`Ca_(3)P_(2)+6H_(2)Oto3Ca(OH)_(2)+2PH_(3)`

Solution :
Discussion
19661.

Which one of the following is used as catalyst in homogeneous and heterogeneous catalysis?

Answer»

enzymes
zeolite
NANO CATALYST
coenzyme

Solution :nano catalyst
Discussion
19662.

What will be the product of the following reaction Ph-underset(Me)underset(|)(C)-Me overset(RCO_(3)H)to ?

Answer»

`Ph-UNDERSET(Me)underset(|)(C)H-O-underset(O)underset(||)(C)-Me`
Ph-CH
PhCH(Me)OCOOMe
None of these

Solution :
Discussion
19663.

Which of the following oxy acid of sulphur has +6 oxidation state for sulphur?

Answer»

Sulphurous ACID
Peroxy disulphuric acid
Sulphuric acid.

Solution :Peroxydisulphuric acid, `H_(2)S_(2)O_(8)` has `+6` OXIDATION state of S.
Discussion
19664.

Which of the following is a state function and also an extensive property ?

Answer»

INTERNAL energy
Pressure
Molar HEAT capacity
Temperature

Answer :A
Discussion
19665.

Which of the following will exhibit optocal isomerism ?

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`[Cr(EN)(H_(2)O)_(4)]^(3+)`
`[Cr(en)_(3)]^(3+)`
trans-`[Cr(en)(Cl_(2))(NH_(3)_(2)]^(+)`
`[Cr(NH_(3))_(6)]^(3+)`

Solution :`[Cr(en)_(3)]^(3+)` exhibit optical isomerism. When an OCTAHEDRAL complex contains three bidentate GROUPS, it SHOW optically activity and exist in two enantonmeric forms.
Discussion
19666.

What happens: (a) By persistent dialysis of a sol .

Answer»

SOLUTION :(a) COAGULATION of SOL TAKES PLACE .
Discussion
19667.

van.t Hoff factor for a dilute solution of sodium argento cyanide is:

Answer»

2
0.25
0.5
3

Answer :A
Discussion
19668.

Value of standard electrode potential for the oxidation of Cl^(-) ions is more positive than that of water, even then in the electrolysis of aqueous sodium chloride, why is Cl^(-) oxidised at anode instead of water?

Answer»

Solution :OXIDATION of `H_(2)O` to `O_(2)` is kinetically so slow that it needs some OVERVOLTAGE. Hence, `CL^(-)` is oxidized instead of WATER.
Discussion
19669.

When O_(3) is passed through an aqueous solution of KI, the pH of the resulting solution is

Answer»

7
`6.8`
`2.8`
4

Answer :D
Discussion
19670.

What causes nitrogen to be chemically inert ?

Answer»

Multiple BOND formation
Absence of bond POLARITY
Short internuclear DISTANCE
HIGH bond energy

Answer :A
Discussion
19671.

When a radioactive element emits an electron the daughter element formed will have

Answer»

Mass number one UNIT less
Atomic number one unit less
Mass number one unit more
Atomic number one unit more

Solution :`._(Z)A^(m) RARR ._(Z +1)B^(m) + ._(-1_e^(0)`
Discussion
19672.

Which of the following is purified by vacuum distillation?

Answer»

Glycerine
Glycerol
Propane-1,2,3-triol
All of these

Answer :D
Discussion
19673.

Write structures of the compound whose IUPAC names are as follows : 1-Ethoxypropane

Answer»

SOLUTION :`CH_3CH_2 -O-CH_2 CH_2 CH_3`
Discussion
19674.

Which of the following substances will precipitate the negatively charged emulsions ?

Answer»

KCI 
Glucose 
UREA 
`NaCl`

SOLUTION :`NaCl and KCl` CONTAINS `Na^(+) and K^(+)` which precipitates negatively CHARGED emulsions.
Discussion
19675.

When a metal is to be extracted from its ore, if the gangue associated with the ore is silica, then________.

Answer»

an ACIDIC FLUX is needed
a BASIC flux is needed
both acidic and basic flux are needed
neither of them is needed

Answer :B
Discussion
19676.

Which of the following reactions of benzene proves the presence of three carbon-carbon double bonds in it :

Answer»

Formation of a triozonidewith ozone
Hydrogenation of benzene to cyclohexane
Formation of `C_6H_6Cl_6` by ADDITION of chlorine
Formation of nitrobenzene on heating benzene with a mixture of CONCENTRATED NITRIC acid and sulphuric acid

ANSWER :ABC
Discussion
19677.

What should be the correct IUPAC name for diethylbromomethane ?

Answer»

1-Bromo-1,1-diethylmethane
3-Bromopentane
1-Bromo-1-ethylpropane
1-Bromopentane

SOLUTION :`H-OVERSET(underset(2)(C )H_(2)-underset(1)(C )H_(3))overset("|")underset(underset(4)(C )H_(2)-underset(5)(C )H_(3))underset("|")(underset("3")("C-Br")`
Discussion
19678.

What is the order of reaction if the unit of rate constant is litre mol^(-1) sec^(-1)?

Answer»

SOLUTION :If the UNIT of rate constant is litre`MOL^(-1) sec^(-1)`,then.it is SECOND order REACTION
Discussion
19679.

Which among the following is an alicyclic compound?

Answer»



ANSWER :C
Discussion
19680.

Which of the following compounds will have the highest melting point and why ? o - dichlorobenzene , m - dichlorobenzene and p - dichlorobenzene .

Answer»

Solution :p- DICHLOROBENZENE will have the highest melting point because it FITS into CRYSTAL lattice BETTER than other isomers .
Discussion
19681.

Which of the following is a disinfectant and in a diluted form act as an antiseptic as well?

Answer»

Aspirin
Phenol
Veronal
Salol

ANSWER :B
Discussion
19682.

Which may be consumed in the elemental from by human beings ?

Answer»

Zn
CU
Ag and Cu
Fe

Answer :C
Discussion
19683.

Which will have greater molar conductivity and why? Sol A. 1 mol KCl dissolved in 200 cc of the solution. Sol. B. 1 mol KCl dissolved in 500 cc of the solution.

Answer»

SOLUTION :Solution B will have greater MOLAR conductivity because `wedge_(m)=kappaxxV`. With DILUTION, `kappa` decreases but V increases much more so that product increases.
Discussion
19684.

Which one of the following compounds is most reactive towards nucleophilic addition

Answer»

`CH_(3)CHO`
`PhCOCH_(3)`
`PhCOPh`
`CH_(3)COCH_(3)`

Solution :In nucleophilic addition reaction of carbonyl compounds order of reactivity is

The lower reactivity of ketones over aldehydes is due to `+I` effect of the alkyl group. The aromatic aldehydes and ketones are LESS reactive than their ALIPHATIC analogues. This is due to the `+R` effect of the benzene ring. From the above information, it is clear that INCREASING order of the nucleophilic addition reaction in the following compound will be, `PhCOPh lt PhCOCH_(3) lt CH_(3)COCH_(3) lt CH_(3)CHO`
Discussion
19685.

The group 16 elements are characterised by the electronic configuration:

Answer»

`ns^2 np^4`
`ns^2 np^2`
`ns^1 np^3`
`ns^2 np^5`

ANSWER :A
Discussion
19686.

Which of the following isomerism is not possible for complexes having molecular formulae? (I) Pt(SCN)_(2)*3PE t_(3), (II) CoBr*SO_(4)*5NH_(3) (III) FeCl_(2)*6H_(2)O

Answer»

Optical
Linkage
Ionisation
HYDRATE

Solution :(I) `[Pt(SNC)(3PE t_(3)](SCN)`, Exhibits only linkage ISOMERISM.
(II) `[CoBr(NH_(3))_(5)]SO_(4)`, Exhibits only hydrate isomerism.
(III) `[Fe(H_(2)O)_(6)]Cl_(2),` Exhibits only hydrate isomerism.
Discussion
19687.

Which of the following statements regarding halogens is not true ?

Answer»

Halogens ACT as strong oxidizing agents
Fluorine oxidizes water to oxygen and ozone
Chlorine oxidizes water to oxyge
Bromine DISPROPORTIONATES in water PRODUCING the reaction
`Br_(2)+H_(2)O to HBR +HOBr`

Solution :The reaction of `Cl_(2)` with water is `Cl_(2)+H_(2)O to HCl+HOCl`
Discussion
19688.

The transition element iron belongs to ul"4d-series of transition elements."

Answer»

SOLUTION :3d-series of TRANSITION ELEMENTS.
Discussion
19689.

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

Answer»

2
3
0
1

Solution :`Ba(OH)_(2)` is STRONG electrolyte, so its 100% dissociation occurs in solution
`Ba(OH)_(2)rarr Ba^(+2)+2OH_((AQ))^(-)`
Van.t HOFF FACTOR = total number of ions present in solution i = 3
Discussion
19690.

Total number of organic products formed (major , minor all).

Answer»


SOLUTION :
Discussion
19691.

What does the part '6,6' mean in the name of nylon-6, 6?

Answer»

Solution :It means that both the MONOMERS USED in condensation polymerization LEADING to the formation of nylon-6, 6 CONTAIN six carbons, each.
Discussion
19692.

Which one of the following has the regular tetrahedral structure ?

Answer»

`BF_(4)^-`
`SF_(4)`
`XeF_(4)`
`[Ni(CN)_(4)]^(2-)`

ANSWER :A
Discussion
19693.

What is the total number of compounds having at least one bridging oxo group among the molecules given below ? N_(2)O_(3),N_(2)O_(5), P_(4)O_(6),P_(4)O_(7),H_(4)P_(2)O_(5),H_(5)P_(2)O_(10),H_(2)S_(2)O_(3),H_(2)S_(2)O_(5).

Answer»

SOLUTION :

Discussion
19694.

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

Answer»

Acid HYDROLYSIS of ESTER
Decomposition of HI
Synthesis of `NH_(3)`
All RADIOACTIVE TRANSFORMATIONS

ANSWER :A
Discussion
19695.

Which one out of S_(N)1 and S_(N)2 reactions is more susceptible to steric effect and which one is susceptible to electronic effect?

Answer»

Solution :`S_(N)1` REACTION is more susceptible to electronic EFFECT while `S_(N)2` reaction is more susceptible to steric effect.
Discussion
19696.

When chlorine is passed through propene at 400^(@)C, which of the following is formed?

Answer»

PVC
Allyl chloride
Vinyl chloride
1,2-Dichloroethane.

Answer :B
Discussion
19697.

What is the role of these as food additives? i) Sodium benzoate. ii) Aspartame.

Answer»

SOLUTION :(i) Food preservative.
(ii) ARTIFICIAL SWEETENING agent.
Discussion
19698.

Which one is used as a Lubricating agent ?

Answer»

PVC
PTFE
PAN
SBR

SOLUTION :PTFE
Discussion
19699.

Which will give silver mirror test with Tollen's reagent?

Answer»

`Me-C-=C-H`
`Me-OVERSET(O)overset(||)(C )-CH_(2)OH`
`Me-overset(O)overset(||)(C )-UNDERSET(Me)underset(|)overset(OH)overset(|)(C)-Me`
All of these

Solution :`Me-overset(O)overset(||)(C )-CH_(2)OH` gives SILVER mirror test.
Discussion
19700.

Which of following is an oligosaccharide?

Answer»

Glucose
Fructose
Sucrose
Starch

Answer :C
Discussion