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.

21751.

Which of the following is very strongly acidic oxide?

Answer»

<P>`P_(2)O_(5)`
`Al_(2)O_(3)`
`Cl_(2)O_(7)`
`B_(2)O_(3)`.

Answer :C
Discussion
21752.

When isobutyl bromide in dry ether is treated with absolute ethyl alcohol, the products formed are

Answer»

`CH_3-UNDERSET(CH_3)underset|CH-CH_2OH` and `CH_3CH_2MgBr`
`CH_3-undersetunderset(CH_3)|CH-CH_2-CH_2-CH_3` and Mg(OH)Br
`CH_3-underset(CH_3)underset(|)CH-CH_3` and `CH_3-CH_2OMgBr`
`CH_3-undersetunderset(CH_3)|CH-CH_3, CH_2=CH_2` and Mg(OH)Br

Solution :`CH_3-undersetunderset(CH_3)(|)CH-CH_2-Mg-Br+C_2H_5OH to underset"ISOBUTANE"(CH_3-undersetunderset(CH_3)(|)CH-CH_3)+underset"ETHOXY magnesium bromide"(C_2H_5OMgBr)`
Discussion
21753.

Zeolites :

Answer»

Are microporous aluminosilicates
Have general formula `M_(x//n) [(A//O_2)_x(SiO_2)_4] mH_2O`
Have PORE size between 260 PM to 740 pm
All

Answer :D
Discussion
21754.

Which forms interstitial compounds ?

Answer»

Fe
Co
Ni
All

Answer :D
Discussion
21755.

Which of the following is allylic halide ?

Answer»

Benzyl CHLORIDE
(1-bromo ethyl) BENZENE
1-bromo benzene
3-chloro CYCLO hex-1-ene

ANSWER :D
Discussion
21756.

When bromination of anilineis carried out byprotecting -NH_(2). The product is

Answer»

o-bromonailine
2,4,6- TRIBROMOANILINE
m-bromoaniline
p-bromoanilie

ANSWER :D
Discussion
21757.

Which is the most basic of the following oxides:

Answer»

`Na_2O`
BAO
`Al_2O_3`
`As_2O_3`

ANSWER :A
Discussion
21758.

Which loses weight on exposure to the atmosphere ?

Answer»

CONC. `H_2SO_4`
NaOH
Anhyd.`AlCl_3`
SATURATED AQUEOUS SOLUTION of `CO_2`

ANSWER :D
Discussion
21759.

Write IUPAC names of the following compounds and classify them into primary, secondary and tertiary amines. {:("(i) "(CH_(3))_(2)CHNH_(2), " (ii) "CH_(3)(CH_(2))_(2)NH_(2)), ("(iii) "CH_(3)NHCH(CH_(3))_(2)," (iv) "(CH_(3))_(3)CNH_(2)), ("(v) "C_(6)H_(5)NHCH_(3)," (vi) "(CH_(3)CH_(2))_(2)NCH_(3)), ("(vii) "m-BrC_(6)H_(4)NH_(2).," "):}

Answer»

Solution :IUPAC names ALONGWITH the classification (primary, secondary and tertiary) of the compounds are given below :
(i) Propan-2-amine `(1^(@))`, (II) Propanamine `(1^(@))`, (III) N-Methylpropan-2-amine `(2^(@))`, (iv) 2 Methylpropan-2-amine `(3^(@))`, (V) N-Methylbenzenamine or N-Methyllaniline `(2^(@))`, (vi) N-Ethyl-N-methylethanamine `(3^(@))`, (vii) 3-Bromobenzenamine or 3-Bromoaniline `(1^(@))`.
Discussion
21760.

Which one of the following pairs gives effervescence with aq. NaHCO_(3)?

Answer»

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

Answer :A
Discussion
21761.

Which shows inert pair effect ?

Answer»

B
Al
Tl
Sc

Answer :C
Discussion
21762.

Write the principle of method used for the refining of germanium.

Answer»

Solution :Refining of germanium is DONE by zone refining. The principle of the METHOD is the impurities are more soluble in the melt than in the solid state of the method. A circular mobile heater is moved along the impure metal rod. As the heater MOVES forward, the pure metal CRYSTALLISES out of the melt.
Discussion
21763.

tripositive actinides ions are

Answer»

with three PROTONS
with three NEUTRONS
with three electrons
with three electrons less than its atomic NUMBER

Answer :D
Discussion
21764.

What is the function of anhydrous ZnCl2 in Lucas test for distinction between 1^(@) , 2^(@) and 3^(@) alcohols?

Answer»

Solution :The REACTION of alcohol with HCl UNDERGOES `SN_2` path way to form chloroalkane. `Cl^(o-)` is not a GOOD nucleophile and in alcohol, -OH is a bad leaving group. Thus, the reaction is carried out in presence of `ZnCl_2` . Since, `ZnCl_2` is a LEWIS acid, it forms a complex with oxygen of alcohol and converts the -OH to a better leaving group, THEREBY leading to the formation of chloroalkane.
Discussion
21765.

Ultraviolet light of 6.2 eV falls on aluminium surface (work function = 4.2 eV). The kinetic energy (in joule) of the fastest electron emitted is approximately:

Answer»

`3xx10^(-21)`
`3xx10^(-19)`
`3xx10^(-17)`
`3xx10^(-15)`

ANSWER :B
Discussion
21766.

Which one of the following types of drugs reduces fever ?

Answer»

Analgesic
Antipyretic
Antibiotic
Tranquilizer

Answer :B
Discussion
21767.

Which of the following do not have tendency to act as ligands during complex formation?

Answer»

`BiH_(3)`
`PH_(3)`
`AsH_(3)`
`SbH_(3)`

Answer :A::C::D
Discussion
21768.

Vapour density of a gas is 22. its molecular weight will be :

Answer»

33
22
44
11

Answer :C
Discussion
21769.

The viscosity of molten sodium is 4.5 xx 10^(-4) Nm^(-2)sat 473 K and 2.12 xx 10^(-4) Nm^(-2) s at 873 K. Calculate the activation energy for the viscous flow. Also, calculate the viscosity at 673 K.

Answer»

Solution :We have,
`log eta_(1)/eta_(2) = E/(2.303 R) ((T_(2)-T_(1))/(T_(1)T_(2)))`
`log(4.5 xx 10^(-4))/(2.12 xx 10^(-4)) = E/(2.303 xx 8.314) ((873-473)/(473 xx 873))`
E=6461 J/mole
=6.461 kJ/mole
Further, let the viscosity at 673 K be `eta_(2)`
Again, we have, `T_(1) = 473 K, eta_(1) = 4.5 xx 10^(-4)`
`T_(2) = 673 K, eta_(2)`= ?
`log (4.5 xx 10^(-4))/eta_(2) = 6461/(2.303 xx 8.314) ((673-473)/(473 xx 673))`
`eta_(2) = (2.76 xx 10^(-4) Nm^(-2)s)`
Discussion
21770.

What is the maximum mass of H_(2)O (in gm) which can be obtained if total 42 gm of propyne & oxygen are subjected to combusion ?

Answer»


Solution :`{:(C_(3)H_(4(G)),+,4O_(2(g)),to,3CO_(2(g))+2H_(2)O_((l))),((40 GM)/(1/4"mole"),,128 gm,,1/2 "mole" =9 gm):}`
168 gm mixture should have 40 gm psopyne
42 gm mixture should have `40/168 xx42=10 gm`
Discussion
21771.

The term (-dC/dt) in rate equation refers to:

Answer»

The CONCENTRATION of a reactant
The DECREASE in concentration of the reactant with time
The VELOCITY CONSTANT of reaction
None

Answer :B
Discussion
21772.

Which of the following reagents could be used to distinguish aniline from methanamine ? Bromine water CHCl_(3) and aqueous KOH Dilute HCl Nitration mixture under heated condition

Answer»

(i) only
(i) and (II)
(i) and (III)
(i) and (IV)

Solution :When bromine water is added to aniline at room temperature decolourisation of the bromine water OCCURS and a white ppt. of 2,4,6-trinbromoaniline is obtained.

White ppt.
Methanamine do not react with bromin water.
Discussion
21773.

Which of the following is an example of nucleophilic addition reaction

Answer»

`CH-=CH+H_(2) OVERSET(Pd//BaSO_(4).S)to CH_(2)=CH_(2)`
`CH-=CH+H_(2)O overset(HG^(2+)//H_(+))to CH_(3)CHO`
`CH-=CH+H_(2)O to CH_(2)-CHBr_(2)`
`CH-=CH+CH_(3)COOH overset((CH_(3)COO)_(2)Mg)to CH_(3)-CH(OOC CH_(3))_(2)`

Solution :Addition of water and acetic acid to acetylene are examples of nucleophilic addition reactions. Addition of `H_(2)(Pd//BaSO_(2)-S)` and HBr to acetylene are EXAMPLE of electolphilic addition reactions.
Discussion
21774.

Which one of the following is the hybridised state of C atoms in carbonyl carbon?

Answer»

SP
`sp^3 d`
`sp^3`
`sp^2`

SOLUTION :`sp^2`
Discussion
21775.

The transition metals have a less tendency to form ions due to

Answer»

HIGH IONISATION energy
Low HEAT of HYDRATION of ion
High heat of sublimation
All of these

Answer :D
Discussion
21776.

When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH_(3) dissolves O and gives an intense blue solution. The final solution contains

Answer»

`[Pb(NH_(3))_(4)]^(2+)` and `[CoCl_(4)]^(2-)`
`[Al(NH_(3))_(4)]^(3+)]` and `[Cu(NH_(3))_(4)]^(2+)`
`[Ag(NH_(3))_(2)]^(+)` and `[Cu(NH_(3))_(4)]^(2+)`
`[Ag(NH_(3))_(2)]^(+)` and `[Ni(NH_(3))_(6)]^(2+)`

Answer :C
Discussion
21777.

Urea is

Answer»

Monoacidic base
Diacidic base
Neutral
Anmphoteric

Solution :UREA BEHAVES as a monoacidic base and react with NITRIC acid and FORM sparingly coluble NITRATE.
Discussion
21778.

Vapour density of a gas having formula[CO]_x is 70. Find out X

Answer»

3.5
4.5
5
6

Answer :C
Discussion
21779.

Write the IUPAC name of the compound : CH_(3)-underset(OH)underset("|")"CH"-CH_(2)-COOH

Answer»

SOLUTION :IUPAC name of the COMPOUND is
`underset("3 - Hydroxybutanoic acid")(overset(4)(CH_(2))-underset(OH)underset("|")overset(3)("CH")-overset(3)(CH_(2))-overset(1)(COOH))`
Discussion
21780.

The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species ?

Answer»

`[CoCl_(6)]^(4-)`
`[Fe(SCN)_(6)]^(3-)`
`[Fe(C_(2)O_(4))_(3)]^(3-)`
`[Fe(H_(2)O)_(6)]^(3+)`

Answer :C
Discussion
21781.

Whatare differenttypesof RNAwhichor foundin cell ?

Answer»

SOLUTION :RNA molecules areclassifiedaccordingto theirstructureand functioninto three majortypes.
(i) RibosomalRNA(r- RNA)
(ii ) MessengerRNA ( m - RNA)
(III) TransferRNA (t- RNA) .
r- RNA : rRNAis mainlyfoundin cytoplasmand in ribosomes,whichcontain 60 %RNAand 40%PROTEIN. Ribosomesare the sitesat whichproteinsynthesistakes place.
t- RNA : tRNAmolecules havelowestmolecularweightof all nucliecacids . Theyconsist of 73-94 nucleotides in a SINGLECHAIN . The functionof tRNA is to carryanimoacidsot the sitesof proteinsynthesis onribosomes .
m - RNA: mRNAis presentin smallquantityand very short lived. Theyare singlestranded,and theirsynthesistakesplace onDNA . Thesynthesis of mRNA form DNA strandiscalledtransciption . mRNAcarriesgenticinformationform DNAto theribosomes forprotein synthesis.
Discussion
21782.

What are essential and non-essential amino acids ? Give two examples of each.

Answer»

Solution :ESSENTIAL amino acids are those which are not produced in our BODY and required to be supplied from OUTSIDE, e.g., VALINE , leucine.
Non-essential amino acids are those which are produced by our body, e.g., glucine , ALANINE.
Discussion
21783.

When the pressure and absolute temperature of 5L nitrogen are doubled, the gas would have a volume of :

Answer»

10L
5L
15L
20L

Solution :`p_(1) =p`, `p_(2) = 2p`,
`T_(1) = T, T_(2) = 2T`,
`V_(1) = 5L, V_(2) = ?`
`( \p_(1) V_(1))/( T_(1))= ( p _(2) V_(2))/( T_(2))`
or `V_(2) = ( p_(1) V_(1) T_(2))/( T_(1) p _(2))`
`= ( p XX 5 xx 2T )/( T xx 2p ) = 5L`
Discussion
21784.

What happens when KCIO_3 reacts with cone. H_2SO_4?

Answer»

SOLUTION :`ClO_2` GAS is EVOLVED.
`3KClO_3 + 3H_2SO_4 RARR 3KHSO_4+ 2ClO_2 + HClO_4 +H_2O`
Discussion
21785.

which among the following minerals does not contain aluminium?

Answer»

Cryolite
SIDERITE
China clay
Corundum

Solution :Siderite
Discussion
21786.

Which one is oleum?

Answer»

`H_(2)S_(2)O_(7)`
`H_(2)S_(2)O_(5)`
`H_(2)SO_(3)`
`H_(2)S_(2)O_(6)`

ANSWER :A
Discussion
21787.

Write IUPAC name of the following compound: m-NC-C_6 H_4 -NH_2.

Answer»

SOLUTION :3-Cyanobenzenamine or 3-Aminobenzenenitrile.
Discussion
21788.

What will be the octane no. of best fuel

Answer»

80
81
74
65

Solution :The BEST fuel is that which has GREATEST OCTANE number and thus (B) OPTION is correct
Discussion
21789.

The surface tension of toluene at 298 K is 0.0284 Nm^(-1)and its density is 0.866 g/cc. What is the largest radius of the capillary that will permit the liquid to rise 2 xx 10^(-4) m? Assume theta =0 .

Answer»


ANSWER :`3.34 XX 10^(-4) m`
Discussion
21790.

The VA group elements are present in the Earth's crust as

Answer»

Nitrates
Phophates
CARBONATES
Sulphates

Solution : Sources of VA group elements in earth.s crust are nitrates and Phophates like `Mg_(3)N_(2), Ca_(3)(PO_4)_2`PHOSPHATE rock.
Discussion
21791.

Which of the following aqueous solutions containing 10g of solute in each case, has highest melting point?

Answer»

NACL solution
KCl solution
SUGAR solution
GLUCOSE solution

Answer :C
Discussion
21792.

The strongest bronsted base is:

Answer»

`CIO^-`
`CIO_3^-`
`CIO_2`
`CIO_4^-`

ANSWER :A
Discussion
21793.

Unit of electrochemical equivalent is kg/Faraday. Is it true or false?

Answer»

SOLUTION :gram/coulomb
Discussion
21794.

To determine the elevation of boiling point more accurately. The solvent area should take

Answer»

higher value of `K_(B)`
LOWER value of `K_(b)`
HIGH molar mass
low molar mass

Solution :The solvent with higher value `K_(b)` will give larger value of `Delta T` for the solution of GIVEN MOLALITY, hence comparatively more accuracy.
Discussion
21795.

Which is not true about the voids formed in three dimensional hexagonal close-packed structure-

Answer»

a tetrahedral void is formed when a sphere of the second layer is PRESENT above TRIANGULAR void in the first layer
all the triangular voids are not covered by the spheres of the second layer
tetrahedral voids are formed when the triangular voids in the second layer LIE above the triangular voids in the first layer and the triangular shapes of these voids do not overlap
octahedral voids are formed when the triangular voids in the second layer EXACTLY overlap with SIMILAR voids in the first layer

Answer :C::D
Discussion
21796.

The reagents A, B and C respectively are

Answer»

`H_(2)//Pd`, PCC, `NaBH_(4)`
`NaBH_(4)`, alk. `KMnO_(4)`, `H_(2)//Pd`
`NaBH_(4)`, PCC, `H_(2)//Pd`
`H_(2)//Pd`, alk. `KMnO_(4)`, `NaBH_(4)`

Solution :(b):
`:.` A = `NaBH_(4)`, B = alk. `KMnO_(4)` and C = `H_(2)//Pd`. `NaBH_(4)` does not REDUCE double bond. However, CATALYTIC hydrogenolysis `(H_(2)//Pd)` reduces both double bond and the carbonyl group.
Discussion
21797.

The sequence of bases on RNA molecules synthesized on the GCATA strand of DNA is :

Answer»

CGUAU
CGTAT
TACGC
AYCGC.

Answer :A
Discussion
21798.

Which of the following is most easily hydrolysed amongst the following

Answer»

`SF_(6)`
`NF_(3)`
`C Cl_(4)`
`TeF_(6)`

SOLUTION :`TeF_(6)` undergoes hydrolysisto form `Te(OH)_(6)`. `SF_(6)` does not HYDROLYSE because ofits compact symmetrical structure.
Discussion
21799.

The toal number of structural isomeric alcohols having the molecular C_(5)H_(12)O is.

Answer»


SOLUTION :Eight (8) ISOMERS are:
(i) `CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)OH(1^(@)),`
(ii) `CH_(3)CH_(2)CH_(2)-CHOH-CH_(3)(2^(@))`,
(iii) `CH_(3)CH_(2)-CHOH-CH_(2)CH_(3)(2^(@)),`
(IV) `CH_(3)CH_(2)-overset(CH_(3))overset(|)(C)H-CH_(2)OH(1^(@))`
(v) `CH_(3)-overeset(CH_(3))overset(|)(C)H-CH_(2)CH_(2)OH(1^(@))`
(vi) `CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(2)CH_(3)(3^(@))`
(vii) `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)OH(1^(@))`
(viii) `CH_(3)-overset(CH_(3))overset(|)(C)H-overset(OH)overset(|)(C)H-CH_(3)(2^(@))`.
Discussion
21800.

Which one of the following compounds is not aromatic -

Answer»





SOLUTION :Cyclooctatetraene is a tub-shaped compound and THUS it is NON -aromatic.
Discussion