Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

4101.

When r,P and M represent rate of diffusion, pressure and molecular mass respectively, then the ratio of the rates of diffusion ( r_(A) //r_(B)) of two gases A and B , is given as :

Answer»

<P>`( P_(A) //P_(B)) ( M_(B)//M_(A)) ^(1//2)`
`( P_(A) //P_(B))^(1/2) ( M_(B)//M_(A))`
`( P_(A) //P_(B)) ( M_(A)//M_(B)) ^(1//2)`
`( P_(A) //P_(B))^(1/2) ( M_(A)//M_(B))`

Solution :`R PROP (p )/( SQRT(d))` or `prop ( p )/( sqrt( M ))`
`:. ( r_(A))/( r_(B)) = ( p_(A))/( p _(B)) = sqrt((M_(B))/( M_(A)))`
Discussion
4102.

When an aqueous solution of sodium chloride is electrolysed using platimun electrodes, the ion discharged at the electrodes are

Answer»

sodium and HYDROGEN
sodium and chloride
hydrogen and chloride
hydroxyl and chloride

Solution :`Nacl HARR Na^(+)+Cl^(-)`
`H_(2)O hArr UNDERSET(DARR^(E^(-)))(H^(+))+OH^(-)`
`underset(("At cathode"))((1)/(2)H_(2)) larr H, Cl^(-) rarr Cl rarr underset(("At anode"))((1)/(2))Cl_(2)+e^(-)`
Reduction potential of H is more than Na.
Discussion
4103.

Which of the following is not a natural polymer ?

Answer»

STARCH
CELLULOSE
NYLON
Protein

Solution :Nylon
Discussion
4104.

What happens when (i) Conc. H_(2)SO_(4) is added to CaF_(2). (ii) SO_(3) is passed through water?

Answer»

Solution :(i) It forms hydrogen fluoride.
`CaF_(2)+H_(2)SO_(4)RARR CaSO_(4)+2HF`
(II) It dissolved `SO_(3)` to GIVEN `H_(2)SO_(4)`
`SO_(3)+H_(2)Orarr H_(2)SO_(4)`.
Discussion
4105.

Which of the following ion is likely to form white complexes

Answer»

 `CD^(2+)`
`Ti^(3+)`
 `CR^(3+)`
none of the above

Answer :A
Discussion
4106.

Which of the following is not lewis base

Answer»

`NH_(3)`
`PH_(3)`
`(CH_(3))_(3)N`
`HN_(3)`

SOLUTION :Hydrazoic ACID `(HN_(3))` is a Lewis acid.
Discussion
4107.

Which of the following compound will not undergo acid catalysed hydrolysis ?

Answer»




ANSWER :B
Discussion
4108.

Which of the following 0.1M aqueous solution will have lowest freezing point?

Answer»

POTASSIUM sulphate
Sodium chloride
Urea
Glucose

Answer :A
Discussion
4109.

Which of the following precipitate does not dissolve even in large excess of NH_(4)OH

Answer»

AgCl
AgBr
AgI
None of these

Solution :AgCl and AgBr DISSOLVE in `NH_(4)OH` and form complexes but AgI doesn’t react with `NH_(4)OH`. E.g.,
`AgCl+2NH_(4)OH to UNDERSET("COMPLEX")([Ag(NH_(3))_(2)])Cl+2H_(2)O`
Discussion
4110.

Xenon difluoride reacts PF_5they give which pair of ions

Answer»

`[XEF]^(+) [PF_6]^-`
`[XeF_3]^(+) [PF_6]^-`
`[XeF_5]^(-) [PF_6]^+`
`[XeF_7]^(-) [PF_6]^+`

ANSWER :A
Discussion
4111.

Two isomeric halo alkenes (A) and (B) have molecular formula C_(5)H_(9)Cl. (A) gives optically inactive compound whil (B) give optically active compound in hydrogenation. The two iosmers respectively are:

Answer»

3-chloro-1-pentane and 4-chloro-2-pentene
4-chloro-1-pentene and 2-chloro-2-pentene
3-chloro-2-pentene and 1-chloro-2-pentene
1-chloro-1-pentene and 5-chloro-1-pentene

Answer :A
Discussion
4112.

Which one of the following is most basic ?

Answer»

`F^(-)`<BR>`CL^(-)`
`Br^(-)`
`I^(-)`

ANSWER :A
Discussion
4113.

Which of the following statements concerning covalent bond is false ?

Answer»

The electrons are shared between atoms
The bond is non - DIRECTIONAL
The strength of the bond DEPENDS upon the EXTENT of overlapping
The bond formed may be polar or non - polar.

ANSWER :B
Discussion
4114.

Which of the following is obtained on hydrolysis of sucrose ?

Answer»

`ALPHA`-D-(+)-GLUCOSE and `BETA`-D-(-)-FRUCTOSE
`beta`-D-(+)-Glucose and `alpha`-D-(-)-Fructose
`alpha`-D-(+)-Glucose and `alpha`-D-(-)-Fructose
`beta`-D-(+)-Glucose and `beta`-D-(-)-Fructose

SOLUTION :`alpha`-D-(+)-Glucose and `beta`-D-(-)-Fructose
Discussion
4115.

What structural difference is there between a-glucose and B-glucose ?

Answer»

SOLUTION :The TWO COMPOUNDS DIFFER in the CONFIGURATION at C-1.
Discussion
4116.

Which of the following compounds will have C_(2) axis of symmetry?

Answer»




ANSWER :A::B::C::D
Discussion
4117.

Which one of the following characteristics apply to both ethene and ethyne

Answer»

Explode when MIXED with chlorine
Decolourise Baeyer's REAGENT giving brown PRECIPITATE
Rapidly ABSORBED by cold conc `H_2SO_4`
Form white precipitate with silver nitrate solution

Solution :`CH_2=CH_2+underset"ALK."(KMnO_4)underset(H_2O)overset"[O]"to undersetunderset(OH)(|)CH_2-underset"Colour less"undersetunderset(OH)(|)(CH_2)+underset"Brown"(MnO_2)`
`CH-=CH+underset"alk."(KMnO_4)overset"[O]"to underset"Oxalic acid"undersetunderset"COOH""|""COOH"+underset"Brown"(MnO_2)`
Discussion
4118.

Which of the following has 3C-4e^(-) bond? Al_(2),Cl_(6),Al_(2)Br_(6),I_(2)Cl_(6),Fe_(2)Cl_(6),BCl_(3),BF_(3),Si_(2)H_(6),Si_(2)Cl_(6),C_(2)Cl_(6) [If your answer is 2 then write the answer as 0002.]

Answer»


Solution :`AL_(2)Cl_(6),Al_(2)Br_(6),I_(2)Cl_(5),Fe_(2)Cl_(6)`
Discussion
4119.

Write the rate equation for the reaction 2" A"+" B"to"C" if the order of the reaction is zero.

Answer»

SOLUTION :RATE `=K[A]^(0)[B]^(0)=k.`
Discussion
4120.

Which of the compound is correctly matched?

Answer»

`CH_(3)-CH=CH-CH=CH-C_(2)H_(5)4`
`CH_(3)-(CH=CH)_(4)-CH_(3) 2`
`H_(2)C=CH-CH=CH_(2)2^(3)+2^(1)=10`
`CH_(3)(-CH=CH)_(5)-CH_(5) 2^(4)+2^(2)=20`

Answer :A::D
Discussion
4121.

Which of the following has d_(c-o) (Carbon-oxygen bond length) longer than that of free CO molecule ?

Answer»

`NI(CO)_(4)`
`Fe(CO)_(5)`
`CR(CO)_(6)`
All of these

Solution :B.L`uarr` due to SYNERGIC bonding
Discussion
4122.

What are the differences between Schottky and Frenkel defects ?

Answer»

SOLUTION :The important DIFFERENCES between Schottky and FRENKEL defects are given below:
Discussion
4123.

Which of the following biphenyl is optically active-

Answer»




SOLUTION :In biphenyl system, due to the steric interaction between the bulky substituents at the ortho positions of the biphenyl rings,the compound becomes non - planar which MAKES this type of molecules OPTICALLY active.
Discussion
4124.

What happens when the external pressure applied becomes more than the osmotic pressure of the solution?

Answer»

Solution :When the external pressure applied becomes more than the OSMOTIC pressure of the solution, then the solvent molecules from the solution pass through the semipermeable membrane to the solvent SIDE. The PROCESS is CALLED REVERSE osmosis.
Discussion
4125.

Which sugar is present in DNA?

Answer»

DEOXYRIBOSE
RIBOSE
D-fructose
D - GLUCOSE

ANSWER :A
Discussion
4126.

What is K_b, if 0.5 g of solute ( molar mass 100g/mol) in 25g of solvent showed an elevation of 1^@C in B.P.

Answer»


ANSWER :`K_b`=5
Discussion
4127.

What type of flux is used when the sugarcane is acidic ?

Answer»

Acidic
Basic
Neutral
Alcoholic

Answer :B
Discussion
4128.

Which of the following 5f-series elements has fully filled 5f-orbitals ?

Answer»

Only NOBELIUM and americium
Only nobelium and lawrencium
Only americium and lawrencium
Only americium and CURIUM

Answer :B
Discussion
4129.

Which of the following parameters cannot be estimated by using Born-Haber cycle?

Answer»

Hydration ENERGY of ion
Electron gain enthalpy
lattice enegy
Electronegativity

Solution :Electronegativity ANND hydration energy cannot be estimated by USING born-haber CYCLE.
Discussion
4130.

Two important physical evidence support the synergic bonding in non-classical complexes-bond lengths and vibrational spectra. Vibrational spectra is based on the fact that the compression and extension of a bond may be analogous to the behaviour of spring and obeys Hooke's law. overset(-)v=(1)/(2pic) sqrt((K)/(mu))cm^(-1) Where, K=force constant of the bond which is directly proportional to bond strngth mu="reduced mass of ligand" overset(-)v="stretching frequency of the CO bond" C="velocity of light" In compound [M(CO)N]^(z) the correct match for highest M-C bond length for given M, N and Z respectively

Answer»

`{:(M,N,Z),(Ti,6,0):}`
`{:(M,N,Z),(Ti,6,-1):}`
`{:(M,N,Z),(Ti,6,-2):}`
`{:(M,N,Z),(Ti,6,+1):}`

Solution :`[Ti(CO)_(6)]^(z)`
As charge (+ve)`uarr` on CENTRAL ATOM, synergic bonding `darr` and M-C bond length elongates.
Discussion
4131.

The sum of the number of lone pairs of electrons on each central atom in the following species is [TeBr_(6)]^(2-), [BrF_(2)]^(+), SNF_(3) and [XeF_(3)]^(-) (Atomic numbers : N=7, F=9, S=16, Br=35, Te=52, Xe-54)

Answer»


ANSWER :6
Discussion
4132.

Two important physical evidence support the synergic bonding in non-classical complexes-bond lengths and vibrational spectra. Vibrational spectra is based on the fact that the compression and extension of a bond may be analogous to the behaviour of spring and obeys Hooke's law. overset(-)v=(1)/(2pic) sqrt((K)/(mu))cm^(-1) Where, K=force constant of the bond which is directly proportional to bond strngth mu="reduced mass of ligand" overset(-)v="stretching frequency of the CO bond" C="velocity of light" In which of the following, ligand bond order does not change (within ligand) during synergic bonding in their respective complexes ?

Answer»

CO
NO
`CH_(2)=CH_(2)`
`Pet_(3)`

ANSWER :D
Discussion
4133.

Which of the following is the example of disaccharide ?

Answer»

Glucose
Raffinose
Cellulose
Sucrose

Answer :A::D
Discussion
4134.

Two important physical evidence support the synergic bonding in non-classical complexes-bond lengths and vibrational spectra. Vibrational spectra is based on the fact that the compression and extension of a bond may be analogous to the behaviour of spring and obeys Hooke's law. overset(-)v=(1)/(2pic) sqrt((K)/(mu))cm^(-1) Where, K=force constant of the bond which is directly proportional to bond strngth mu="reduced mass of ligand" overset(-)v="stretching frequency of the CO bond" C="velocity of light" In which of the following complex, stretching frquency for C-O bond is least as well as bond energy of M-C bond is highest ?

Answer»

<P>`[(dien)MO(CO)_(3)]`
`[(Et_(3)P)_(3)Mo(CO)_(3)]`
`[(F_(3)P)_(3)Mo(CO)_(3)]`
`[(Cl_(3)P)_(3)Mo(CO)_(3)]`

ANSWER :A
Discussion
4135.

Which of the following carbocation will undergo rearrangemment ?

Answer»



`CH_(3)-UNDERSET(underset(CH_(3))(|))CH-overset(+)C=O`
`CH_(3)-NH-overset(+)CH-underset(underset(CH_(3))(|))CH-CH_(3)`

ANSWER :B
Discussion
4136.

Which of the following statements is incorrect about the order of a reaction?

Answer»

The ORDER of a REACTION is DETERMINED experimentally.
It is the sum of the powers of concentration terms in the rate law expression.
It does not necessarily depend on stoichiometric coefficients.
The order of a reaction can not have a fractional value.

Answer :D
Discussion
4137.

Which of the following carboxylic acids undergo decar boxylation easily?

Answer»

`C_(6)H_(5)CO-CH_(2)COOH`
`C_(6)H_(5)CO-COCOOH`
`C_(6)H_(5)- UNDERSET(OH) underset(|)(CH_(2))-COOH`
`C_(6)H_(5)underset(NH_(2)) underset(|)(CH_(2))-COOH`

Answer :A
Discussion
4138.

Which of the following sulphates are yellow ?

Answer»

`CdS`
`As_(2)S_(3)`
`SnS_(2)`
`ZNS`

ANSWER :A::B::C
Discussion
4139.

The two projection formulae that represent a pair of enantiomers are.

Answer»

I and II
III and IV
I and III
II and IV

Answer :C
Discussion
4140.

What is Van't Hoff factor ? Under what conditions Van't Hoff factor is (i) gt 1 (ii) =1 lt1. Explain .

Answer»

Solution :Van.t Hoff factor (i) is the rate of NATURAL molecular mass `(M_(a))` to the observed molecular mass `(M_(a))`
`i=(M_(n))/(M_(0))`
(i) Now, i `gt` 1 when `M gt M_(0-)`. This can happen in case of ELECTROLYTES when the solute undergoes dissociation in solution and thus corresponds to lower value of molar mass that is observed fTom MEASUREMENT of colligative property.
(ii) i = 1 when `M_(n) = M_(0)`. This can occur if the solute does not UNDERGO dissociation or association in solution.
(iii) `i lt 1` when `M_(n) lt M_(0)` This can happen if the solute undergoes association in solution so that the value of observed molar mass becomes larger.
Discussion
4141.

Which of the following is maximum soluble in organic solvent :-

Answer»

LIF
LICL
LIBR
LiI

Solution :Covalent CHARACTER increases = solubility in organic SOLVENT `(uarr)`so LiCl is maximum soluble in organic solvent
Discussion
4142.

Which of the following is are present in mica?

Answer»

K
AL
Si
Ca

Solution :Mica`:K_(2)O_(3)Al_(2)O_(3).6SiO_(3)6H_(2)O`
Discussion
4143.

What are X and Y in the following reactions ?

Answer»




Solution :(i) `:. H_(2) O`is HIGHLY polar in nature and anilineis highly reactive towards electrophilicsubstitution
Thus, `Br_(2) "in"H_(2) O`gives : 2, 4 , 6 tribromo aniline as main product i.e.
(ii)On the other hand `CH_(3) COOH`will decrease the REACTIVITY by replacing the H-atom of `-NH_(2)`group with `CH_(3)CO-`group to GIVE .
and as a result only mono-substituted BROMINE at p-position is the major product i.e.,
Discussion
4144.

Which of the following has highest entropy -

Answer»

Water
Graphite
Mercury
Hydrogen

Answer :D
Discussion
4145.

Which of the following configurations are correct in the first excited state?

Answer»

`Cr:[AR]3D^(5)4s^(1)`
`Mn^(2+):[Ar]3d^(5)`
`Fe^(2+):[Ar]3d^(5)4s^(1)`
`Co^(3+):[Ar]3d^(5)4s^(1)`

Solution :`Cr:[Ar]3d^(5)4s^(1)rArr`GROUND state
`Mn^(2+):[Ar]3d^(5)rArr` Ground state
`Fe^(2+):[Ar]3d^(6)rArr` Ground state
`[Ar]3d^(5)4s^(1),rArr` Excited state
`[Co^(3+)] : [Ar]3d^(6)rArr` Ground state,
`[Ar]3d^(5)4s^(1)rArr` Excited state
Discussion
4146.

Tollen's reagent test can be performed to detect :

Answer»

`-CHO` GROUP
`-OH` group

`-COOH` group

ANSWER :A
Discussion
4147.

Under the same reaction condition the initial concentration of 1.386 mol dm^(-3) of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics. Ratio ((K_(1))/(K_(0))) of the ratio constants for first order (K_(1)) and zero order (K_(0)) of the reaction is :

Answer»

`0.5mol^(-1)DM^(-3)`
`1.0mol^(-1)dm^(-3)`
`1.5mol^(-1)dm^(-3)`
`2.0mol^(-1)dm^(-3)`

SOLUTION :`K_(1)=(0.693)/(t_(1//2))=(0.693)/(40)`
`K_(0)=(a)/(2t_(1//2))=(1.386)/(2xx20)`
`:.(K_(1))/(K_(0))=(0.693)/(1.386)=0.5`
Discussion
4148.

Which of the following is incorrectly matched?

Answer»

`{:("Complex","Number of UNPAIRED electrons"),({FeF_(6)]^(3-),5):}`
`{:("Complex","Number of unpaired electrons"),([Cr(en)_(3)]^(2+),2):}`
`{:("Complex","Number of unpaired electrons"),([CO(NH_(3))_(6)]^(3+),4):}`
`{:("Complex","Number of unpaired electrons"),({Mn(H_(2)O)_(6)]^(2+),5):}`

Answer :C
Discussion
4149.

The vapour pressure of a solvent decreased by 10 mm of mercury, when a non-volalite solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in the vapour pressure is to be 20 mm of mercury ?

Answer»

0.2
0.4
0.6
0.8

Answer :C
Discussion
4150.

What are the monomeric repeating units of Nylon-6 and nylon-6,6 ?

Answer»

Solution :The MONOMERIC repeat UNIT of Nylon-6 polymer is :
`[NH - (CH_(2)) _(5) - CO]`
The monomeric repeat unit of Nylon-6,6 polymer is derived from the TWO monomers, hexamethylene diamine and adipic acid.
`[NH - (CH_(2)) _(6) - NH - CO - (CH_(2)) _(4)- CO]`
Discussion