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4251.

Which of the following are examples of metamerism?

Answer»

ETHOXYETHANE and 1-methoxypropane
pentan-2-one and pentan-3-one
N-Methylpropan-1 AMINE and N-ethylethanamine
All of the above

Answer :D
Discussion
4252.

Which one of the following compounds is not planar?

Answer»

`CH_2 = C = CH_2`
`CH_2= CH_2`
`CH _2= CH - CH = CH_2`
`CH_2 = CH – C H= CH`

ANSWER :A
Discussion
4253.

Which of the following is a weakest base :

Answer»

Ammonia
Methylamine
Dimethylamine
Trimethylamine

Answer :A
Discussion
4254.

The standard electrode potential are for the following reactions : Fe_((s)) rarr Fe_((aq.))^(2+) + 2e , E^(@) = 0.48 V Cr^(3+) + e rarr Cr_((aq.))^(2+) , E^(@) = -0.41 V If excess of Fe_(s) is added to a solution in which [Cr^(3+)] = 1M, what will be maximum value of [Fe^(2+)] when equilibrium is attained at 298 K ?

Answer»


ANSWER :`0.48 ;`
Discussion
4255.

The SI unit of cell potential is ................ .

Answer»

SOLUTION :VOLT (V)
Discussion
4256.

The time for half change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant . How much of A will be left after 180 seconds?

Answer»

Solution :(i) Order of reaction =`1, t_(1//2)= 60, "seconds" , k = ? `
We know that , `k=(2.0303)/(t_(1//2))`
`k = (2.303)/60 = 0.01155s^(-1)`
(II) `[A_0]=100% , t = 180 s, k = 0.01155 " seconds "^(-1) , [A] = ? `
For the FIRST order reaction `k=(2.303)/t log.([A]_0)/([A])`
`0.01155=(2.303)/180log.(100/([A]))IMPLIES(0.1155xx180)/(2.303)=log(100/([A]))`
0.9207=log100-log[A]
log [A] = log 100 - 0.9207
log [A] = 2 - 0.9207
log [A] =1.0973
[A] = antilog of (1.0973)
[A] = 12.5%
Discussion
4257.

What is Deltan_(g) for the combusion of 1 mole of benzene, when both reactants and products are gases at 298K

Answer»

0
1
0.5
1.5

Solution :`C_(6)H_(6)(G)+(15)/(2)O_(2)(g) to 6CO_(2)(g)+3H_(2)O(g)`
`Deltan=6+3-1-(15)/(2)=+0.5`
Discussion
4258.

Which of the following will give a primary amine on reduction with LiAIH_(4) ?

Answer»

Oxime
Alkyl cyanide
Alkyl isocyanide
Nitroparaffin.

Answer :B
Discussion
4259.

Tritum decays by

Answer»

`beta` EMISSION
`alpha` emission
`gamma` radiation
does not DECAY

ANSWER :A
Discussion
4260.

Write the structure of the major organic product expected from each of the following reactions: CH_(3)CH_(2)CHCl_(2)underset("alkali")overset("Boil")to

Answer»

Solution :`CH_(3)CH_(2)CHCl_(2)underset(-2 "NACL ALKALI")OVERSET(BOIL)to (##VMC_NEET_XII_CHE_MOD_05_C20_SLV_026_S01.png" width="80%">
Discussion
4261.

Which of the following does not contain PX_(4)^(+)type cation in solid phase ? (X=halogen atom)

Answer»

`PF_(5)`
`PCl_(5)`
`PBr_(5)`
NONE of these

Answer :A
Discussion
4262.

Which one of the following vitamins deficiency causes rickets:

Answer»

VITAMIN A
Vitamin B
Vitamin C
Vitamin D

Answer :D
Discussion
4263.

The total number of acyclic isomers including the steroisomers (geometrical and optical), with the molecular formula C_(4)H_(7)Cl is:-

Answer»

12
11
10
9

Answer :A
Discussion
4264.

Which one of the following complexes will have four isomers?

Answer»

`[Co(EN)_(3)]Cl`
`[Co(en)_(2)Cl_(2)]Cl`
`[Co(PPh_(3))_(2)(NH_(3))Cl_(2)]Cl`
`[Co(PPh_(3))_(3)Cl]Cl_(2)`

Solution :Complex `[Co(en)_(2)Cl_(2)]Cl` will have four DIFFERENT isomers.
(i) GEOMETRICAL isomers
Discussion
4265.

Whenlimestone isheated,CO_ 2is givenoff.Themetallurgical operationis

Answer»

SMELTING
reduction
calcination
roasting

Answer :C
Discussion
4266.

Which type of hybridisation is possible in [Ni(CN)_(4)]^(2-) and [Pt(NH_(3))_(4)]^(2+) ?

Answer»

`dsp^(2)`
`dsp^(3)`
`SP^(3)d`
`sp^(3)d^(2)`

ANSWER :A::B::D
Discussion
4267.

Van Arkel method can be applied for the purification of:

Answer»

B
Zr
Ti
all of these

Answer :D
Discussion
4268.

Which one is Isoprene ?

Answer»

`CH_(2) = CH_(2)`
`CF_(2) - CF_(2)`
`CH_(2)=C=CH_(2)-CH_(3)`
`CH_(2)=OVERSET(CH_(3))overset("|")"C "-CH=CH_(2)`

Solution :`CH_(2)=overset(CH_(3))overset("|")"C "-CH=CH_(2)`
Discussion
4269.

what is the shortest wavelength line in Paschen series of Li^(2+)ion (R is Rydberg constant)

Answer»

`1/R`
`3/R`
`16`/`7R`
4R

Answer :A
Discussion
4270.

Which of the reactions represented in these diagram will show the greatest increase in rate for a given increase in temperature ?

Answer»

REACTION I foraward
Reaction I reversed
Reaction II foraward
Reaction II reversed

Answer :B
Discussion
4271.

What is natural rubber?

Answer»

cis-1, 4-polyisoprene
NEOPRENE
Trans-1, 4-polyisoprene
BUTYL RUBBER

ANSWER :A
Discussion
4272.

Which substance is added in chloroform before the use of it as anesthetic ?

Answer»

Methyl ethyl ketone
Ethyl alcohol
Acetone
Methylene chloride

Solution :Chloroform in presence of LIGHT and air oxidizes to poisonous GAS PHOSGENE `(COCl_(2))`. To prevent, the formation of phosgene, ethanol is added to it. `2CHCl_(3)+O_(2)overset(" Light ")rarr underset("Phosgene")(2COCl_(2))+2HCl`
Discussion
4273.

What are the units of the rate constant of a reaction in which the half life is doubled by halving the initial concentration of reactants.

Answer»

`M-s^(-1)`
`M^(-1)s^(-1)`
`SEC^(-1)`
`M^(-2)s^(-1)`

ANSWER :B
Discussion
4274.

Which of the folowing set of molecules have same shape but different hybridisation ?

Answer»

`XeO_(4), SF_(4)`
`XeO_(3), BrF_(3)`
`H_(2)O, SnCl_(2)`
`I_(3)^(-), I_(3)^(+)`

ANSWER :C
Discussion
4275.

When CH_(3)COOH reacts with CH_(3)-Mg-X

Answer»

`CH_(3)COX` is formed
Hydrocarbon is formed
Acetone is formed
Alcohol is formed

Solution :`CH_(3)COOH+CH_(3)-Mg-XtoCH_(3)-CH_(3)`.
Discussion
4276.

The source from where most of helium is obtained at present is

Answer»

SUN
Sea water
Minerals
Natural gas

Solution :Sun has VAST AMOUNT of He
Discussion
4277.

What chemical principle isinvolvedin choosing a reducingagent for gettingthe metalfrom itsoxideore ? Considerthe metaloxides Al_2O_3 andFe_2O_3 , andjustifythe choiceof thereducingagent.

Answer»

Solution :Thechemicalprincipleinvolvedin thereducing of metaloxidestometalsis THATAT any giventemperature,any metal will reducetheoxideof othermetalswhich lie aboveit intheEllinghamdiagram. This isbecuasethe standard free ENERGY CHANGE (`Delta_rG^(@)` ) ofthecombinedredox reactionwill be- ve by an amountequal tothe difference in` Delta_f G^(@) `ofthetwometaloxides atthat temperature. It isevident that the`Delta_fG^(@)`curvefor theformationFeO `(or Fe_2O_3` not shownin thediagram )lies above the ` Delta _fG^(@)`curveforthe formation of`Al_2O_3`. Therefore, Al canreduce` FeOor Fe_ 2 O_ 3 ` to
`2Al+2FeOoverset ( Delta ) to Al_2O_3+3Fe or "" 2 Al+ Fe_2O_3 overset (Delta ) to Al_2O_3 +2 Fe`
Febut thereverseis not TRUE, i.e., Fecannotreduce `Al_2 O_3 `to` Al`
` ""2 Fe+Al_2 O_3 toFe_2O_3 +2Al `
Above 1073 K, theC, CO curvelies below Fe, FeO curve,therefore, above 1073, C can reducesFeO toFe.
` FeO+C overset ( gt 1073K) toFe+CO`
In contrast, below 1073 K, the CO, `CO_2 `cuve lies below Fe, FeO curve, therefore,below 1073 K, CO canreduce FeOto Fe.
` "" FeO+COoverset ( lt 1073 K ) toFe+ CO _ 2`
Discussion
4278.

What is activated charcoal ?

Answer»

SOLUTION :It is the CHARCOAL TREATED with superheated STEAM to increase its ABSORPTION power.
Discussion
4279.

Which of the following methods of expressing concentration are independent of temperatuer?

Answer»

Molarity
MOLALITY
Normality
MOLE fraction

Solution :Molality and mole fraction involve only MASSES of the SOLUTE and solvent and no volumes, hence they are independent of temperature.
Discussion
4280.

Which of the following is CORRECT expression of calculating the cell potential of an electrochemical cell ?

Answer»

`E=E^(@)-(RT)/(nF)In([PRO"DUCTS])/([REACTANTS])`
`E=E^(@)+(RT)/(nF)In([pro"ducts])/([reactants])`
`E=E^(@)-(RT)/(nF)In([reactants])/([pro"ducts])`
`E=-(RT)/(nF)In ([pro"ducts])/([reactants])`

Answer :A
Discussion
4281.

Which one of the following is a peptide hormone ?

Answer»

Adrenaline
Thyroxine
Glucogen
Testosterone

Answer :B
Discussion
4282.

Treatment of benzene with CO//HCl in the presence of anhydrous AlCl_(3)//CuCl followed by reaction with Ac_(2)O//NaOAc gives a compound X. Reaction of X with H_(2)//Pd//c followed by treatment with H_(3)PO_(4) gives another compound Y. The compound Y is :

Answer»




SOLUTION :
Discussion
4283.

The solubility of N_(2) in water at 300K at 300K and 500 torr partial pressure 0.01 gL^(-1). The solubility (in g L^(-1) ) at 750 torr partial pressure is :

Answer»

0.0075
0.005
0.02
0.015

Solution :PARTIAL PRESSURE = MOLE FRACTION xx solubilit
`(p_(1))/(p_(2))=(s_(1))/(s_(2))implies500/750=0.01/(s_(2))impliess_(2)=0.015gL^(-1)`
Discussion
4284.

What is the maximum possible van't hoff factor of COC13.. xNH_(3) (assume all ammonia is coordinated)

Answer»


ANSWER :4
Discussion
4285.

Which of the following is purified by sublimation if the impurities are non-volatile ?

Answer»

CANE sugar
Naphthalene
Urea
Acetic acid

Answer :B
Discussion
4286.

Why are carboxylic acids called fatty acids?

Answer»

SOLUTION :Since the higher acids such as palmitic acid, STEARIC acid, oleic acid, etc., were first OBTAINED by SAPONIFICATION of OILS and fats.
Discussion
4287.

The vapour pressure of a solvent is 60 torr while that of its dilute solution is 52 torr. The mole fraction of the solvent is :

Answer»

<P>0.867
0.133
0.902
0.568

Solution :`p^(@)=60` TORR, `p_(s)=52` torr
`(p^(@)-p_(s))/(p^(@))=X`(solute)
`(60-52)/(60)=x` (solute)
or `x` (solute)`=0.133`
`x`(solvent)`=1-0.133=0.867`
Discussion
4288.

Which of the following structures does not contain any chiral C atom but represent the chirality in the structure ?

Answer»

2-Ethyl-3-hexene
2,3-Pentadiene
1,3-Butadiene
Pent-3-en-1-yne

Solution :The MOLECULE 2,3-pentadiene does not have any MIRROR PLANE which MAKES the molecule CHIRAL.
Discussion
4289.

Which of the following is the major product formed when phenol is treated with dilute nitric acid at 293 K?

Answer»

m-Nitrophenol
p-Nitrophenol
2,4,6-Trinitrophenol
o-Nitrobenzene

Answer :B
Discussion
4290.

Which of the following represents the correct order of increasing first ionisation enthalpy for Ca, Ba, S, Se and Ar ?

Answer»

CA S Ba Se Ar
S Se Ca Ba Ar
Ba Ca Se S Ar
Ca Ba S Se Ar

Solution :In a group I.E. decreases and therfore`CagtBa`and `SgtSe`
In a period I.E in general INCREASES from left to RIGHT and therefore.
`ArgtS`and`SegtCa`
Hence correct order is
`BaltCaltSeltSltAr`
Discussion
4291.

Two jars A and B are filled with hydrocarbons. Br_2 in C CI_4 is added to these jars. A does not decolourises whereas B decolourlises. What are A and B:

Answer»

ALKANE and alkene
Alkene and alkane
Both
None of these

Answer :A
Discussion
4292.

Which branched chain isomer of the hydrocarbon with molecular mass 72mu gives only one isomer of mono substituted alky halide ?

Answer»

Tertiary BUTYL chloride
Neopentane
Isohexane
Neohexane

Solution :`underset"neopentane"(H_3C-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-CH_3)underset"MONOHALOGENATION"overset(Cl_2//hv)to "SINGLE product"`
Discussion
4293.

What happens when ethyl iodide is heated with alcoholic KOH.

Answer»

Solution :When ethyl BROMIDE is TREATED with alcoholic KOH solution ETHYLENE is formed.
` underset(ethylbromide)(C_2H_5Br)+KOH_(ALC.) rarr KBR +H_2O+underset(ETHYLENE)(C_2H_4)`
Discussion
4294.

Which of the following regulates the metabolism of sugars

Answer»

Thyroid
Insulin
Hydrocortisone
None

Answer :B
Discussion
4295.

Which by - product is obtained in the manufacture of phenol from cumene ?

Answer»

Acetone
Acetaldehyde
Benzaldehyde
Acetic acid.

Answer :A
Discussion
4296.

Which polymer is used to prepare fishing net ?

Answer»

Nylon-6,6
BAKELITE
DECRON
Nylon-6

Solution :Nylon-6,6
Discussion
4297.

Write down the reaction are involved in the extraction of lead. PbS+2O_(2)rarr A,, 2PbS+3O_(2)rarr B +2SO_(2): PbS+2PbO rarr C + 2SO_(2) .A,B,Crespectively

Answer»

PbS`,PbSO_(4)` PBO
`PbSO_(4),PbO, PB`
`PbSO_(4),Pb, PbO`
`PbS,PbSO_(4) , PbO`

Answer :B
Discussion
4298.

The specific conductance of 0.1N KCl solution at M 23^@C is 0.012 ohm^(-1)cm^(-1). The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

Answer»

`0.142 CM^(-1)`
`0.66 cm^(-1)`
`0.918 cm^(-1)`
`1.12 cm^(-1)`

ANSWER :B
Discussion
4299.

Which of the following structures represents thymine ?

Answer»




SOLUTION :The CORRECT STRUCTURE of THYMINE is
Discussion
4300.

Which of the following change the colour of the aqueous solution of FeCl_(3)

Answer»

`K_(4)[Fe(CN)_(6)]`
`H_(2)S`
`NH_(4)CNS`
`KCNS`

Solution :`FeCl_(3)+K_(4)[Fe(CN)_(6)]to underset("FERRI ferrocyanide (blue)")(Fe_(4)[Fe(CN)_(6)]_(3))`
`2FeCl_(3)+3H_(2)S to Fe_(2)S_(3)+6HCL`
`3NH_(3)CNS+FeCl_(3)to underset(("blood RED"))(Fe(CNS)_(3))+3NH_(4)Cl`
`FeCl_(3)+3KCNSto underset(("Blood red"))(Fe(CNS)_(3))+3KCl`
Discussion