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4351.

When alcohols are converted to alkyl chlorides by thionyl chloride in presence of pyridine the intermediate formed is ________.

Answer»

sulphonium ION
chlorosulphonic ACID
ALKYL chlorosulphite
chlorosulphite

ANSWER :C
Discussion
4352.

Which of the following, upon treatment with tert-BuONa followed by addition of bromine water, fails to decolourize the colour of bromine

Answer»




Solution :With , alkene can not be produced with t-BuONa. HENCE the product will not decolourise the BROMINE WATER.
Discussion
4353.

The two structures written below represent ,

Answer»

pair of diastereomers
pair of enantiomers
same molecule
both are optically INACTIVE

Solution :
Since `180^(@)` ROTATION converts STRUCTURE [I] to [II] THEREFORE I and II represents the same molecule, i.e., option (C ) is correct.
Discussion
4354.

Which of the following compounds is formed when a mixture of K_(2)Cr_(2)O_(7) and NaCl is heated with conc. H_(2)SO_(4)?

Answer»

`CrO_(2)Cl_(2)`
`CrCl_(2)`
`Cr_(2)(SO_(4))_(3)`
`Na_(2)CrO_(4)`

Solution :`K_(2)Cr_(2)O_(7)+4NaCl +5H_(2)SO_(4)RARR K_(2)SO_(4)+4NaHSO_(4)+underset("chloride")underset("Chromyl")(2CrO_(2)Cl_(2))+3H_(2)O`
Discussion
4355.

Which of the following will not decolourise acidified KMnO_(4) ?

Answer»

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

SOLUTION :(A), (B) and (C) are REDUCING AGENT while (D) is not
Discussion
4356.

Which of the following is a branched polymer?

Answer»

LOW DENSITY POLYTHENE
POLYESTER
NYLON
PVC

Answer :A
Discussion
4357.

Which of the following is an example of a fractional order reaction?

Answer»

`NH_(4)NO_(2)toN_(2) + 2H_(2) O`
`NO + O_(3) to NO_(2) + O_(2)`
`2NO + Br_(2) to 2NOBr`
`CH_(3) CHO to CH_(4) + CO`

Solution :`CH_(3)CHO to CH_(4) + CO`
RATE `= k [C_(3)CHO]^(3//2)`
Discussion
4358.

Which compound most readily forms hydrogen bonds between its molecules in the liquid state:

Answer»

HCl
HBr
HI
HF

Answer :D
Discussion
4359.

What kind of isomerism exists between [Cr(H_(2)O)_(6)]Cl_(3) (violet) and [Cr(H_(2)O)_(5)Cl]Cl_(2).H_(2)O (greyish green) ?

Answer»

LINKAGE ISOMERISM
solvate isomerism (HYDRATE)
POLYMERISATION isomerism
co-ordination isomerism

Answer :B
Discussion
4360.

The product 'B' is

Answer»




SOLUTION :
Discussion
4361.

Which of the following substance is a food preservative?

Answer»

ASPARTAME 
ASCORBIC acid
The SALTS of sorbic acid
Caramel

Answer :C
Discussion
4362.

Which one of the following is called as inorganic benzene?

Answer»

`B_(2)H_(6)`
`BN`
`H_(2)B_(4)O_(7)`
`B_(3)N_(3)H_(6)`

ANSWER :D
Discussion
4363.

What are characteristic parameters of a unit cell ?

Answer»

Solution :(i) A basic REPEATING structural unit of a crystalline solid is CALLED a unit cell.
(ii) A unit cell is characterised by the THREE edge lengths or LATTICE CONSTANTS a,b and e and the angle between the edges `alpha,beta and gamma`.
(iii)
Discussion
4364.

Under the influence of an electric field, the particles in a sol migrate cathode. The coagulation of the same sol is studied using NaCl, Na_(2)SO_(4) and Na_(2)PO_(4)solutions. Their coagulating values will be in maximum for :

Answer»

`NaCl`
`Na_(2)SO_(4)`
`Na_(2)PO_(4)`
same for all

Solution :The sol particles MIGRATE towards cathode.
So they are positively charged. Hence, anions would be effective in COAGULATION.
Greater is the VALENCE of effective ion, smaller will be its coagulation value.
Discussion
4365.

Which one of the following is reducing sugar ?

Answer»

STARCH
CELLULOSE
GLYCOGEN
FRUCTOSE

ANSWER :D
Discussion
4366.

What is the concentration of sugar (C_(12)H_(22)O_(11)) in mol L^(-1) if its 20 g are dissolved in enough water to make a final volume up to 2 L ?

Answer»

Solution :Molar MASS of sugar `(C_(12)H_(22)O_(11))=12xx12+22xx1+11xx16=342gmol^(-1)`
`"No. of moles in 20 G of sugar "=(20g)/(342gmol^(-1))=0.0585 " mole"`
`"VOLUME of solution= 2 L(Given)"`
`"Molar conentraction "=("Moles of solute")/("Volume of sol in L")=(0.0585mol)/(2L)=0.0293molL^(-1)`
`=0.0293M`
Discussion
4367.

Which one of the following is not a colloidal solution ?

Answer»

smoke
ink
blood
air

Answer :D
Discussion
4368.

Which of the following syntheses could not be doen without involving blocking positions on the ring?

Answer»




Solution :In (c), phenol is `o-` and `p-` directing so both the PRODUCTS would be obtained. Thus to obtain ortho-product exclusively, `p-` POSITION has to be blocked FIRST, and then `Br` intoduced in ortho-postion, FOLLOWED by the removel of group from `p-` postion.
Discussion
4369.

Which of the following having maximum boiling point ?

Answer»

1.1 M glucose SOLUTION
`1.1 M Na_(2)SO_(4)` solution
1.1 M KCl solution
`1.1 M C_(6)H_(12)O_(6)` solution

ANSWER :B
Discussion
4370.

What are the numbers of tetrahedral holes and octahedral holes if the total number of atoms in a solid is N ?

Answer»

Solution :No. of tetrahedral HOLES = 2N
No. of OCTAHEDRAL holes = N
Discussion
4371.

Wurtz reactioninvoles thecondensationoftwo moleculesof alkyl halides in thepresenceof sodiumand dry ether .R-X+2Na+X-Roverset("dry Ether")to R-R+2NaX in this reaction smallamount of alkenais also formedasbyproduct. CH_(3)CH_(2)+CH_(3)CH_(2)Broverset( "Na/dry Ether ") to CH_(3) -CH_(2)-CH_(2)-CH_(3) +H_(2)C= CH_(2) +underset("byproducts")ubrace(CH_(3)-CH_(3)) Tertiary alkyl halides do notgiveWurtz reactio.Franklandreaction is similarbut has certainadvantages overWurtz reactionit is usefulin thesynthesisofsymmetrical alkanesFranlkans reaction is shown by primary , secondary as well as tertiary alkyl haidle. Disproritionationtakes place in :

Answer»

WURTZ REACTION
Frankland reaction
bothof these
NONE of these

ANSWER :A
Discussion
4372.

Wurtz reactioninvoles thecondensationoftwo moleculesof alkyl halides in thepresenceof sodiumand dry ether .R-X+2Na+X-Roverset("dry Ether")to R-R+2NaX in this reaction smallamount of alkenais also formedasbyproduct. CH_(3)CH_(2)+CH_(3)CH_(2)Broverset( "Na/dry Ether ") to CH_(3) -CH_(2)-CH_(2)-CH_(3) +H_(2)C= CH_(2) +underset("byproducts")ubrace(CH_(3)-CH_(3)) Tertiary alkyl halides do notgiveWurtz reactio.Franklandreaction is similarbut has certainadvantages overWurtz reactionit is usefulin thesynthesisofsymmetrical alkanesFranlkans reaction is shown by primary , secondary as well as tertiary alkyl haidle. whichof the followingalkanes is notobtainedfromWurtz reaction ?

Answer»

MEHTANE
ETHANE
PROPANE
Butane

Answer :A
Discussion
4373.

Unit cells can be broadly classified into 2 categories primitive and centred unit cells. The unit cell dimension of a particular crystal system is a = b = c, α = β = γ = 90°. ldentify the crystal system.Give one example for the above crystal system.

Answer»

SOLUTION :NACL(ROCK SALT STRUCTURE)
Discussion
4374.

Wurtz reactioninvoles thecondensationoftwo moleculesof alkyl halides in thepresenceof sodiumand dry ether .R-X+2Na+X-Roverset("dry Ether")to R-R+2NaX in this reaction smallamount of alkenais also formedasbyproduct. CH_(3)CH_(2)+CH_(3)CH_(2)Broverset( "Na/dry Ether ") to CH_(3) -CH_(2)-CH_(2)-CH_(3) +H_(2)C= CH_(2) +underset("byproducts")ubrace(CH_(3)-CH_(3)) Tertiary alkyl halides do notgiveWurtz reactio.Franklandreaction is similarbut has certainadvantages overWurtz reactionit is usefulin thesynthesisofsymmetrical alkanesFranlkans reaction is shown by primary , secondary as well as tertiary alkyl haidle. A mixtureof ethyl iodineandmethyl iodineis subjected tothe Wurtz reaction,theproducts formed are :

Answer»

ETHANE
butane
PROPANE
2- methylpropane

ANSWER :A,B,C
Discussion
4375.

What type of bonds do chalcogens from in +4 and +6 oxidation states?

Answer»

SOLUTION :COVALENT BONDS.
Discussion
4376.

Wurtz reactioninvoles thecondensationoftwo moleculesof alkyl halides in thepresenceof sodiumand dry ether .R-X+2Na+X-Roverset("dry Ether")to R-R+2NaX in this reaction smallamount of alkenais also formedasbyproduct. CH_(3)CH_(2)+CH_(3)CH_(2)Broverset( "Na/dry Ether ") to CH_(3) -CH_(2)-CH_(2)-CH_(3) +H_(2)C= CH_(2) +underset("byproducts")ubrace(CH_(3)-CH_(3)) Tertiary alkyl halides do notgiveWurtz reactio.Franklandreaction is similarbut has certainadvantages overWurtz reactionit is usefulin thesynthesisofsymmetrical alkanesFranlkans reaction is shown by primary , secondary as well as tertiary alkyl haidle. whichamongthe following compounts willgive Wurtz reaction ?

Answer»

`CH_(2)=CH-BR `
`C_(6)H_(5)-Br`
`H_(2)C=CH_(2)-Br`
none of these

Answer :C
Discussion
4377.

What is the name of the following reaction?

Answer»

SOLUTION :Fitting.s REACTION.
Discussion
4378.

Which one of the following is NOT a ligand ?

Answer»

`PH_(3)`
NO
`Br^(-)`
`BF_(3)`

ANSWER :B::C::D
Discussion
4379.

Wurtz reactioninvoles thecondensationoftwo moleculesof alkyl halides in thepresenceof sodiumand dry ether .R-X+2Na+X-Roverset("dry Ether")to R-R+2NaX in this reaction smallamount of alkenais also formedasbyproduct. CH_(3)CH_(2)+CH_(3)CH_(2)Broverset( "Na/dry Ether ") to CH_(3) -CH_(2)-CH_(2)-CH_(3) +H_(2)C= CH_(2) +underset("byproducts")ubrace(CH_(3)-CH_(3)) Tertiary alkyl halides do notgiveWurtz reactio.Franklandreaction is similarbut has certainadvantages overWurtz reactionit is usefulin thesynthesisofsymmetrical alkanesFranlkans reaction is shown by primary , secondary as well as tertiary alkyl haidle. whichof thefollowingcompoundscannotbe preparedbyWurtz reaction ?

Answer»

ETHANE
Iso-butane
N- Butane
neopentane

ANSWER :B,D
Discussion
4380.

Various products formed on oxidation of 2, 5-dimethylhexan-3-one are (i)CH_(3)-underset(CH_(3))underset(|)(CH)-COOH(i) CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-COOH (iii) CH_(3)COOH (iv)HCOOH

Answer»

(i)and (III)
(i), (II) and (iii)
(i) , (ii), (iii) and (IV)
(iii) and (iv)

ANSWER :C
Discussion
4381.

Two liquids X and Y boil at 110^@C and 130^@C , respectively. Which of them has higher vapour pressure at 50^@C ?

Answer»

Solution : X has a HIGHER VAPOUR pressure as it is more volatile.
Discussion
4382.

Which of these compounds are aromatic in character?

Answer»




All of these

Answer :D
Discussion
4383.

The set with correct order of acidity is

Answer»

`HClO lt HClO_(2) lt HClO_(3) lt HClO_(4)`
`HClO_(4) lt HClO_(3) lt HClO_(2) lt HClO`
`HClO lt HClO_(4) lt HClO_(3) lt HClO_(2)`
`HClO_(4) lt HClO_(2) lt HClO_(3) lt HClO`

Solution :For oxyacids containing similar central atom, the acid strength increases with the increase in the number of oxygen ATTACHED to the central atom and not attached to any other atom.
Alternatively, higher the oxidation number of the central atom, higher is the acidity of the SPECIES. THUS acidity follows the order
`{:("Oxi. No. of Cl",HClO ,lt,HClO_(2),lt, HClO_(2), lt, HClO_(4)),(,+1,,+3,,+5,,+7):}`
Discussion
4384.

Which is the correct sequence in the following properties? For the correct order mark (T) and for the incorrect order mark (F) : (i) Melting point : NH_(3) gt SbH_(3) gt AsH_(3) gt PH_(3) (ii) Boiling point : NH_(3) gt SbH_(3) gt AsH_(3) gt PH_(3) (iii) Dipole moment order : NH_(3) gt SbH_(3) gt AsH_(3) PH_(3)

Answer»

TFT
FTF
FFT
FFT

Solution :(i) (T), M.P of `NH_(3)` is HIGHEST due to INTERMOLECULAR H-bonding in it. Next lower M.P. will be of `SbH_(3)` followed by `AsH_(3)` due to high mol. Wt. of `SbH_(3)`.
(II) (F), B.P. increase from `PH_(3) " to "SbH_(3) " via "AsH_(3)` due to increase in mol.wt. ` NH_(3)` does not follow this trend due to inter molecular H-bonding.
Increasing B.P. order : `PH_(3) lt AsH_(3) lt NH_(3) lt SbH_(3)`
(T) : VALUE of bond moment decreases.
Discussion
4385.

Which is a good solvent for ionic and polar covalent compounds ?

Answer»

`H_2O`
`CH_3COOH `
`C Cl_4 `
LIQUID `NH_3 `

ANSWER :A
Discussion
4386.

The relationship between equilibrium constant and standard emf of a cell is

Answer»

`E^(@)=0.0591` log K
`0.0591E^(@)=logK`
`NE^(@)=0.0951logK`
`nE^(@)=0.0591logK`

ANSWER :D
Discussion
4387.

What happens to the solubility of a gas in a liquid with increase in temperature ?

Answer»

Solution :It decreases. DISSOLUTION of a GAS in a LIQUID is an EXOTHERMIC PROCESS.
Discussion
4388.

Which phenomenon takes place in chromatography ?

Answer»

ABSORPTION
ADSORPTION 
Desorption
NONE of these 

ANSWER :B
Discussion
4389.

What is the van't Hoff factor for a compound which undergoes tetramerisation in an organic solvent ?

Answer»

SOLUTION : ASSUMING COMPLETE TETRAMERISATION,
` = 1/4`
Discussion
4390.

Total number of conformational isomers obtained by C-C bond rotation of ethane are

Answer»

2
4
5
Infinite

Answer :D
Discussion
4391.

The tetrahedral nature of the three bonds in a chlorate ion (ClO_3^-) is due to:

Answer»

The PRESENCE of a LONE pair of electrons
`sp^3`-HYBRIDISATION
`sp^2`-hybridisation
Trigonal bipyramidal SHAPE of ion

Answer :B
Discussion
4392.

Two acids H_(2)SO_(4) and H_(3)PO_(4) are neutralized seqarately by the same amount of an alkali when sulphate and dihydrogen orthophosphate are formed respectively. Find the ratio of the masses of H_(2)SO_(4) and H_(3)PO_(4)? (P = 31)

Answer»

Solution :1 g eq of alkali will neutralize 1 g eq. of `H_(2)SO_(4)` and 1 g eq. of `H_(3)PO_(3)`.
For the given neutralisation reactions
`H_(2)SO_(4)+2NaOHrarr Na_(2)SO_(4)+2H_(2)O`
`"and"H_(3)PO_(4)+NAOH rarr NaH_(2)PO_(4)+H_(2)O`
`"Eq. mass of "H_(2)SO_(4)=("Mol. mass")/(2)=(98)/(2)=49`
and Eq. mass of `H_(3)PO_(4)=("Mol. mass")/(1)=(98)/(1)=98`
As the substances REACT in the RATIO of their equivalent MASSES, hence, the ratio of masses of `H_(2)SO_(4)` and `H_(3)PO_(4)=49:98=1:2`.
Discussion
4393.

What is the IUPAC name of the alcohol: HC-=C-CH_(2)OH?

Answer»

SOLUTION :Prop-2-yn-1-ol.
Discussion
4394.

Which of the following reacts with sodamide in liquid ammonia to form an alkynide ?

Answer»

`CH_(2) = CH_(2)`
`C_(6)H_(6)`
`CH_(3)C -= CH`
`CH_(3)C -= C CH_(3)`

Answer :C
Discussion
4395.

Which of the following is least thermally stable ?

Answer»

`MgCO_(3)`
`CaCO_(3)`
`SeCO_(3)`
`BeCO_(3)`

Solution :`BeCO_(3)` is least thermally stable. We KNOW, for the alkaline EARTH METAL carbonates, thermally tability order is
`BeCO_(3) lt MgCO_(3) lt CaCO_(3) lt SrCO_(3) lt BaCO_(3)`
Discussion
4396.

The roasting of HgS in air produces :

Answer»

HGO
`HgSO_3`
`HgSO_4`
Hg

Answer :D
Discussion
4397.

Which product is obtained by partial hydrolysis of XeF_6?

Answer»

`XeO_(3), XeOF_(4), HF`
`XeOF_(4), XeO_(2), HF`
`XeO_(3), XeO_(2)F_(2), HF`
`XeOF_(4) ,XeO_(2)F_(2), HF`

ANSWER :D
Discussion
4398.

Total number of optically stereoisomers of CH_(3)-underset(overset(|)(CI))(C)H-underset(overset(|)(CI))(C)H-underset(overset(|)(CI))(C)H-CH_(3)

Answer»

2
4
6
8

Answer :A
Discussion
4399.

What is incorrect among the following statements regarding a galvanic call?

Answer»

Decrease in electrical WORK is equal to decrease In free energy
Spontaneous redox reaction takes place
At EQUILIBRIUM: `E_("cell")=0`
GREATER the `E_("cell")^(0),` smaller the magnitude of equilibrium constant

Answer :D
Discussion
4400.

Write the structure sof the following compounds: (i). 2-Chloro-3-methylpentane (ii). 1-Chloro-4-ethylcyclohexane (iii). 2-(2-Chlorophenyl)-1-iodooctane (iv). 4-tert, butyl-3-iodoheptane (v). 1,4-Dibromobut-2-ene (vi). 1-Bromo-4-sec. butyl-2-methylbenzene. (vii). p-Bromochlorobenzene.

Answer»

SOLUTION :
Discussion