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.

12451.

The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called

Answer»

CRITICAL temperature
Reduced temperature
Boyle's temperature
Inversion temperature

Answer :C
Discussion
12452.

Which of the following expressions is correct for the rate of reaction given below? 5Br^(-)(aq)+BrO_(3)^(-)(aq)+6H^(+)(aq) to 3Br_(2)(aq)+3H_(2)O(l)

Answer»

`(DELTA[BR^(-)])/(Deltat)=5(Delta[H^(+)])/(Deltat)`
`(Delta[Br^(-)])/(Deltat)=(6)/(5)(Delta[H^(+)])/(Deltat)`
`(Delta[Br^(-)])/(Deltat)=(5)/(6)(Delta[H^(+)])/(Deltat)`
`(Delta[Br^(-)])/(Deltat)=6(Delta[H^(+)])/(Deltat)`

Answer :C
Discussion
12453.

The time t_1 and t_2 are time period for 1/3rd and 2/3rd completion of two first orderreactions If the half lives are in the ratio 10:3. then the ratio of t_1 and t_2 will be

Answer»

1.23
0.81
0.11
2.7

Answer :A
Discussion
12454.

Which of the following statement is incorrect about [Fe(H_(2)O)_(5)NO]SO_(4) :-

Answer»

It produces during brown ring TEST for nitrates
OXIDATION STATE of Fe is +1
It exhibits geometrical ISOMERISM
Charge on NO is +1

Answer :C
Discussion
12455.

Which of the following trivalent ion has the largest atomic radii in the lanthanide series?

Answer»

Ce
Pm
La
Lu

Answer :C
Discussion
12456.

Write the structures of XeO_(3), XeF_(6), XeF_(4), XeOF_(4), XeF_(2)

Answer»

SOLUTION :

Discussion
12457.

What is the main constituent of bubble gum ?

Answer»

SOLUTION :Styrene-butadiene COPOLYMER (SBR).
Discussion
12458.

The reagent and intermediate product in Halls process are

Answer»

`NaOH,NaAlO_(2)`
`Na_(2)CO_(3),NaAlO_(2)`
`N_(2)+CO,NH_(3)`
`NaOH,ALN`

Answer :B
Discussion
12459.

Which of the following isresponsible for the inability of meso compound to show optical activity?

Answer»

ABSENCE of chirality center
Presence of more than one chirality CENTERS
Dissymmetric nature of its STRUCTURE
INTERNAL compensation

Answer :D
Discussion
12460.

What are inner transition elements? Decide which of the following atomic number are the atomic numbers of the inner trasitions elements: 29,59,74,95,102,104.

Answer»

SOLUTION :The f-block elements, i.e., in which the last electron enters into f-subshell are called INNER-transition elements. These include LANTHANOIDS `(58-71)` and actinoids `(90-103)`. THUS, elements with atomic numbers, `59,95` and `102` are inner transition elements.
Discussion
12461.

Which one is correct among the following give, the half cell emf'sE^(0) Cu^(+2)//Cu=0.337V and E_(Cu^(+1)//Cu)^(0) = 0.521 V

Answer»

`Cu^(+1)` DISPROPORTIONATES
Cu and `Cu^(+2)` comproportionates
`E_(Cu//Cu^(+2))^(0) + E_(Cu^(+)//Cu)^(0)` is POSITIVE
`E_(Cu//Cu^(+2))^(0) + E_(Cu^(+)//Cu)^(0)` is negative

Solution :
and also
`Cu^(+2) + 2e^(-) to Cu , DeltaG_1^(0) = -2 xx 0.337 , 2Cu^(+1) + 2e^(-) to 2Cu , DeltaG_2^(0) = -2 xx 0.521`
`Cu+ 2Cu^(+1) to Cu^(+2) + 2Cu , DeltaG_3^(0) = -2 xx E^(0) , E^(0) = 0.521 - 0.337 = + (0.184V)`
Discussion
12462.

Which of the following organometallic compound in sigmma and pi bonded

Answer»

`[FE(eta^(5)-C_(5)H_(5))_(2)`
`[PtCl_(3)(eta^(2)-C_(2)H_(4))]`
`[Co(CO)_(5)NH_(3)]^(2+)`
`Al(CH_(3))_(3)`

Solution :Co FORMS both `sigma` and `PI` bonds with metal atoms.
Discussion
12463.

Which element is most metallic:

Answer»

Phosphorus
Arsenic
Antimony
Bismuth

Answer :D
Discussion
12464.

What is pH of pure water whose is degree of dissociation 18xx10^(-9)?

Answer»


ANSWER :6
Discussion
12465.

Which of the following can not form oxonium salts with diethyl ether?

Answer»

HCl
HBr
`H_2SO_4`
`HCN`

ANSWER :D
Discussion
12466.

What is the molarity of a solution prepared by dissolving 7.1 gram Na_(2)SO_(4) in 100 mL. water ?

Answer»

0.5 M
2 M
0.2 M
0.05 M

SOLUTION :`M=(w xx 1000)/("MOLECULAR weight"xx"volume")`
`= (7.1xx1000)/(142xx100)=0.5M`
Discussion
12467.

What is vulcanization and when it is done?

Answer»

Solution :Vulcanization is a process in which the natural rubber is heated with sulfur to convert the SOFT, tacky thermoplastic MATERIAL to a strong, temperature stable material. The physicochemical change ARISES out of cross-linking of unsaturated hydrocarbon chain of polyisoprene with sulfur. During the vulcanization, inter- molecular thioetherification of polyisoprene with sulfur takes PLACE. The percentage of S used is 1-3, time is 3 mins at `150^(@)C` and only about 0.2% unsaturation is lost.
Vulcanization is carried out after shaping the article. The shaping is DONE with raw rubber compounded with S and other ingredients such as accelerators, antioxidants, fillers, etc.
Discussion
12468.

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is that no precipitate of copper sulphlde is obtained when H_2S(g) is passed through this solution?

Answer»

Solution :First CUPRIC cyanide is formed which decomposes to give cuprous cyanide and cyanogen gas. Cuprous cyanide dissolves in excess of potassium cyanide to form the complex, `K_3[Cu(CN)_4]`
`CuSO_4+2KCNtoCu(CN)_2+K_2SO_4]xx2`
`2CU(CN)_2toCu_2(CN)_2+(CN)_2`
`underline(Cu_2(CN)_2+6KCNto2K_3[Cu(CN)_4])`
`underline(2CuSO_4+10KCNto2K_3[Cu(CN)_4]+2K_2SO_4+(CN)_2)`
Thus, coordination entity formed `=[Cu(CN)_4]^(3-)`
As `CN^(ɵ)` is a strong ligand, the complex ion is highly stable and does not dissociate/ionise to give `Cu^(2+)` ions. HENCE, no precipitate with `H_2S` is formed.
Discussion
12469.

Which is a best substance for coagulation of gold sol?

Answer»

`KNO_(3)`
`K_(4)[Fe(CN)_(6)]`
`MgCl_(2)`
`K_(3)PO_(4)`

Answer :C
Discussion
12470.

(X) , (X) will be :

Answer»

HCOOH


Answer :B
Discussion
12471.

Which is soluble in H_(2)O?

Answer»

PHENOL
ALKANES
ALCOHOLS
ALKENES

ANSWER :C
Discussion
12472.

Whatis the effect of temperataure on the solubilityof sodiumsulphtaedecahydrate(Na_(2)SO_(4)10,H_(2)O) ?

Answer»

Solution :The SOLUBILTY first inscreases upto `32^(@)8` (Calledtransitiontemperature) and THEDECREASE.
Discussion
12473.

Which reaction cannot give anhydrous AlCl_3 :

Answer»

Passing dry HCL over HEATED aluminium POWDER
Passing dry `Cl_2` over heated aluminium powder
Heating a mixture of ALUMINA and COKE in a current of dry `Cl_2`
Heating of `AlCl_3).6H_2O`

Answer :D
Discussion
12474.

The salicylic acid reacts with both the neutral FeCl_3 solution and in esterification reaction because it contains :

Answer»

Both an ACID groupand an alcoholic GROUP
Both an acid groupand an aldehydic group
Both an acid groupand an phenolic group
Both an acid and ESTER group

Answer :C
Discussion
12475.

Which of the following is a conjugated protein

Answer»

Glucoprotein
Phosphoprotein
Chromoprotein
All are correct

Answer :D
Discussion
12476.

Which of the following is not a solution ?

Answer»

`CH_3COOH+CH_3COONa`
`NH_4OH+NH_4Cl`
`H_2CO_3+NaHCO_3`
`NaOH+NaCl`

ANSWER :D
Discussion
12477.

Whichof the followingvitamins iswatersoluble ?

Answer»

VITAMIN E
Vitamin K
Vitamin A
Vitamin B

Answer :B
Discussion
12478.

Wroughtiron is :

Answer»

Pure IRON with 0.1 to` 0.2% C`
Pig iron
An ALLOY of steel
Impure SULPHIDE ore of iron

Answer :A
Discussion
12479.

Write the product of the following reaction: CH_(3)-CH=CH-CH_(2)CN underset((ii)H_(2)O)overset((i)DiBAL-H)to

Answer»

Solution :DiBAL-H reduces -CN group to -CHO group but does not REDUCE etthylenic double bond. For example
`UNDERSET("Pent-3-en-1-nitrile")(CH_(3)-CH=CH-CH_(2)CN) underset((ii)H_(2)O)overset((i)DiBAL-H)to underset("Pent-3-en-1-al")(CH_(3)-CH=CH-CH_(2)CHO)`
Discussion
12480.

Which of the following is completely soluble in water?

Answer»

`SrSO_(4)`
`MgSO_(4)`
`CaSO_(4)`
`BaSO_(4)`

ANSWER :B
Discussion
12481.

Which of the following aryl halides on reaction with Mg in ether followed by treatment with water give toluene?

Answer»




SOLUTION :
Discussion
12482.

Which of the following is NOT a disproportiation reaction?

Answer»

`3Cl_(2) + 6OH^(-)(aq) rarr 5Cl^(-)(aq) + ClO_(3)^(-)(aq) + 3H_(2)O(l)`
`2KMnO_(4)(s) underset(("Heat"))overset(Delta)rarr K_(2)MnO_(4)(s) + MnO_(2)(s) + O_(2)(g)`
`3H_(3)PO_(2)(s) underset("(Heat)")overset(Delta)rarr 2H_(3)PO_(3)(s) + PH_(3)(g)`
`P_(4)(s) + 3OH^(-)(aq) + 3H_(2)O(l) overset(Delta)rarr PH_(3)(g) + 3H_(2)PO_(2)^(-1)(aq)`

Solution :(A), (C ) and (D) are disproportiation reactions as these involve both oxidation and REDUCTION of same element. Option (B) is an intramolecular redox reaction.
Discussion
12483.

Which one is correct :

Answer»

Ni desplaces zinc from its solution
Zn desplaces IRON from is solution
Ag DISPLACES COPPER from its solution
Cu displaces nickel from its solution

Answer :B
Discussion
12484.

What is the final product of the following reaction sequence? (CH_(3))_(3) C-C-=C-H overset((i)dil.H_(2)SO_(4)//HgSO_(4))underset({:(,(ii) NaBH_(4)//"ethanol"),(,"(iii) dil . acid"):})to

Answer»

`(CH_(3))_(3)C-OVERSET(OH)overset(|)(CHCH_3)`
`(CH_(3))_(3)-CH=CH_2`
`(CH_(3))_(2)C=C(CH_3)_(2)`
`(CH_(3))_(3)C-CH_(2)-CH_(2)OH`

Solution :`(CH_(3))_(3)C-C-=C-H overset(HG^(2+)//H_(3)O^(+))to(CH_(3))_(3)C-overset(O)overset(||)C-CH_(3)underset((ii)" dil. "H^(+))overset((i)" NABH"_(4))to(CH_(3))_(3)C-overset(OH)overset(|)CH-CH_(3)`
Discussion
12485.

When isopropyl bromide is heated with sodium in the presence of dry ether, we get :

Answer»

isopentane
2, 3-dimethylbutane
n-hexane
Isohexane

Solution :`CH_(3) - UNDERSET(CH_(3))underset(|)(CHBR) underset("ether")OVERSET(Na)rarr underset("2, 3-Dimethylbutane")(CH_(3) - underset(CH_(3))underset(|)(CH)-underset(CH_(3))underset(|)(CH) - CH_(3))`
Discussion
12486.

Which of the following is the strongest conjugate base?

Answer»

`CL^-`
`CH_3COO^-`
`SO_4^(2-)`
`NO_2^-`

Solution :`CH_3COO^-` is the CONJUGATE base of a weak acid
`CH_3COOH LEFTRIGHTARROW CH_3COO^(-)+H^+`
Discussion
12487.

Which of the following ethers is cleaved even by hydrogen chloride at room temperature ?

Answer»

`C_(6)H_(5)-O-CH_(2)CH_(3)`
`CH_(3)CH_(2)-O-CH_(2)CH_(3)`
`(CH_(3))_(3)C-O-CH_(2)CH_(3)`
`(CH_(3))_(3)C-O-C(CH_(3))_(3)`

Solution :
Due to crowding in protonated ether (1), nucleophilic attack by `CI^(-)` ion does not OCCUR. Instead it undergoes cleavage to give `3^(@)`-butyl ALCOHOL and stable `3^(@)`-butyl carbocation which subsequently reacts with `CI^(-)` ion to form `3^(@)`-butyl chloride. Thus, it is the stability of `3^(@)`-carbocation which favours the cleavage of ether EVEN with HCl.
Discussion
12488.

Which does not give alkyl bromide ?

Answer»

`CH_(3)OH+ HBr`
`CH_(3)OH+PBr_(3)`
`CH_(3)=CH_(2)+HBr`
`CH_(3)COOH+PBr_(3)`

Solution :Compounds a,b,c GIVES alkyl BROMIDE but COMPOUND d give acetylbromide.
Discussion
12489.

Which are relateed with Curtius rearrangement?

Answer»

`NaN_(3)`
`R-NH_(2)`
`R-OVERSET(O)overset(||)(C)-Cl`
`R-overset(O)overset(||)(C)-OH`

ANSWER :A::B::C
Discussion
12490.

When acetone reacts with Ba(OH)_(2) it gives

Answer»

acetoxime
UROTROPINE
t-butyl ALCOHL
DIACETONE ALCOHOL

ANSWER :D
Discussion
12491.

Which metal is used to add to gold to make it hard ?

Answer»

Cu
Ag
Ni
Zn

Answer :A
Discussion
12492.

Which of the following alkyl halides is isopropyl chloride?

Answer»

`CH_(3)CH_(2)CH_(2)Cl`
`CH_(3)-underset(Cl)underset(|)(C)HCH_(3)`
`CH_(3)-underset(CH_(3))underset("|")(CH)-CH_(2)Cl`
`CH_(3)underset(Cl)underset(|)(C)HCH_(2)Cl`

Answer :B
Discussion
12493.

Which of thefollowingstatement(s) is(are) correct?

Answer»

The pH of `1.0 xx10^(-8)` M HClsolution is B
The conjugatebaseof `H_(2)PO_(4)` is `HPO_(4)^(-)`
Autoprotolysisconstantof waterincreases with temperature
When a solutinf weakmonoproticacidis titratedagainsta STRONG base at HALF neutralization POINT , `pH = 1/2 pK_(a)`

Answer :B,C
Discussion
12494.

Which one is used as a reagent in iodine titrations ?

Answer»

`NaSO_3`
`H_2SO_3`
`Na_2S_2O_3. 5H_2O`
`NaHSO_3`

SOLUTION :`Na_2S_2O_3. 5H_2O` (HYPO) is USED in IODINE TITRATIONS
Discussion
12495.

Which product of Mn are obtained on heating KMnO_4 at 513K is …...

Answer»

`K_2MnO_4,Mn_2O_3`
`K_2MnO_2,MnO_2`
`Mn_2O_3,MNO`
`Mn_3O_4,MnO_2`

ANSWER :B
Discussion
12496.

Write the unit for magnetic moment.

Answer»

SOLUTION :Bohr mangeton (or) BM is the UNIT for magnetic MOMENT
Discussion
12497.

What will be the electrode potential of that hydrogen electrode which is filled withh HCL solution of pH value 1.0

Answer»

`-59.15V`
`+59.15V`
`+59.15mV`
`-59.15mV`

Solution :`E_(H^(+)//H_(2))=E_(H^(+)//H_(2))^(0)-(0.05915)/(1)"LOG"(1)/([H^(+)])`
`=0+0.05915log[H^(+)]"VOLT"=-0.05915pH`
`=-0.05915xx1=-0.05915V=-59.15mV`.
Discussion
12498.

What is the IUPAC name of the compound [Pt.Cl.NO_2(NH_3)_4]SO_4

Answer»

SOLUTION :IUPAC name of `[Pt.Cl.NO_2 (NH_3)_4]SO_4` is Tetraamine chloronitro-platinum (IV) SULPHATE.
Discussion
12499.

What kind of electronic transition take place in the exhibition of colour by transition metal ions

Answer»

d to s
s to p
d to p
f to s

Answer :C
Discussion
12500.

Therelateivereactivity of 1^(@):2^(@):3^(@) hydrogensto cholrinationis 1:3:8:5respectivityCalculatethepercentageof isomersformedduringmonochlorrinationof2- methybultane.

Answer»

SOLUTION :
Discussion