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.

851.

Which of the following having a highest boiling point ?

Answer»

Ethane
Butane
Pentane
Butane-2-ol

Solution :In ALCOHOL, there is a FORMATION of H-bond, while in ALKANE H-bond is not POSSIBLE.
Discussion
852.

Which of the following compounds do not exist?N_(4), P_(4), PCI_(5), NCI_(3), P_(2)O_(5) ,NO_(2), PO_(2)

Answer»

`N_(4)` ,`NCI_(5)`, `NO_(2)`
 `N_(4)`, `NCI_(5)`, `PO_(2)`
 `PCI_(5)`, `NCII_(5)`, `PO_(2)`
All of these

Answer :B
Discussion
853.

What happens when aniline is treated with bromine ?

Answer»

SOLUTION :ANILINE DECOLOURISES BROMINE water with the formation of while precipitate which is 2,4,6 - TRIBROMO aniline.
Discussion
854.

Which of the following indicators is used in the titration of Na_(2)S_(2)O_(3) against CuSO_(4) solution?

Answer»

Starch
Barium diphenylamine sulphonate
Cresol red
Iodine solution

Solution :At the end point of an iodine TITRATION with sodium THIOSUPHATE, the iodine is all converted to iodide ions. Thus the bluish colour produced by the starch indicator with iodine disappears and the solution becomes colourless.
If the indicater turns BLUE again. This is because some atmospheric oxidation has taken place forming `I_(2)`, which reacts with the starch to give the blue colour again.
`2I^(-)+1/2 O_(2)+2H^(+) rarr I_(2)+H_(2)O`
The end point of the titration is usually taken as being when the colour disappears and the solution remains colourless for half a minute.
Discussion
855.

Whichof the folloiwng aminecan notbe perparedby Gabrielphtalinamidesynthesis ?

Answer»

METHYL AMINE
n-butyl amine
ETHYL amine
ANILINE

ANSWER :D
Discussion
856.

Which of the following ceramics possesses good strength, translucency and very low porosity

Answer»

whiteware
earthenware
stoneware
bricks and tiles

Solution :WHITE ware POSSESSES good STRENGTH, translucency, and LOW POROSITY.
Discussion
857.

Which of the following process is not respondible for the presence of electric charge on the sol particles ?

Answer»

Electron capature by sol particles
ADSORPTION of ionic SPECIES from SOLUTION
Formation of Helmhorltz electrical DOUBLE layer
Absorption of ionic species from solution

Solution :Charge on sol particles is not due to absorption but due to adsorption of ionic species from solution. Hence, (d) ID incorrect.
Discussion
858.

What would be electronic configuration of the following in the absence of Aufbaug rule? (a) Sr^(2+) (b) Rb^(+)

Answer»

Solution :(a) `Spr^(2+)-1S^(2)2S^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)`
(b)`Rb^(+)-1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)`
Discussion
859.

What is the effect of dilution on the equivalent conductance of strong electrolyte

Answer»

DECREASE on dilution
Remains unchanged
INCREASE on dilution
None of the above

Solution :The equivalent conductance of STRONG electrolyte is increased by dilution, because its value is EQUAL to the MULTIPLE of `K_(v)` and the volume of solution. By making dilution the volume of solution increases which also increase the value of equivalent conductivity.
Discussion
860.

Which of the following are anionic detergents ?

Answer»

SODIUM salts of sulphonated LONG chain alcohol.
Ester of stearic acid and polyethylene glycol.
Quarternary AMMONIUM salt of amine with ACETATE ion.
Sodium salts of sulphonated long chain hydrocarbons. 

Answer :A::D
Discussion
861.

Yellow ammonium sulphide solution is a suitable reagent for the separation of:-

Answer»

HgS and PbS
PbS and `Bi_(2)S_(3)`
`Bi_(2)S_(3) and CuS`
`CdS and As_(2)S_(3)`

Solution :`Cd^(+2)` belongs to II A group while `As^(+3)` to II B. All The SULPHIDES of II B are soluble in yellow ammonium sulphide but those of II A are insoluble.
Discussion
862.

Which will give a yellow precipitate with iodine and alkali:

Answer»

2-hydraxypropane
Benzophenone
methyl acetate
Acetamide

Answer :A
Discussion
863.

Which of the following halide is most reactive towards Nucleophilic substitution reactions ?

Answer»

`H_(3)C-CH_(2)-F`<BR>`H_(3)C-CH_(2)-CL`
`H_(3)C-CH_(2)-Br`
`H_(3)C-CH_(2)-I`

ANSWER :D
Discussion
864.

Which of the following has same Vant Hoff factor

Answer»

`KCl, 50 %`ionised
`K_(2)SO_(4), 40%` ionised
`FeCl_(3), 30%` ionised
`SnCl__(4), 20%`inoised

Answer :B::D
Discussion
865.

Which of the following metals continue to burn in nitrogen gas

Answer»

Li
Mg
Zn
Pb

Solution :Li and Mg reacts with Nitrogen to form NITRIDES because of high REACTIVITY of ALKALI and ALKALINE earth metals.
`6Li+N_(2)rarrunderset("LITHIUM nitride")(Li_3N),3Mg+N_(2)rarrunderset("Magnesium nitride")(Mg_(3)N_2)`
Discussion
866.

Thermoplastics are

Answer»

LINEAR polymer
Highly cross-linked
both (a) and (B)
CRYSTALLINE

ANSWER :A
Discussion
867.

Which moieties of nucleosides are involved in the formation of phosphodiester linkages present in dinucleotides ? What does the word diester in the name of linkage indicate ? Which acid is involved in the formation of this linkage ?

Answer»

SOLUTION :A nucleoside is FORMED by the linkage of BASE to 1. position of SUGAR. When a phosphoric acid is attached to 5. position of sugar moiety, nucleotide is obtained. Two nucleotides are joined together by phosphodiester linkage between 5. and 3. carbon of pentose sugar. The linkage resembles with two ester groups joined together and THUS, it is called diester linkage.
Discussion
868.

Which of the following pairs of complexes are isomerric with each other but their aqueous solution exhibit different molar conductivities?

Answer»

`[PtCl_(2)(NH_(3))_(4)]Br_(2) and [Pt Br_(2)(NH_(3))_(4)]Cl_(2)`<BR>`[CoCl_(2)(NH_(3))_(4)]NO_(2) and [CoCl(NO_(2))(NH_(3))_(4)]Cl`
`[Co(NO_(2))(NH_(3))_(5)]Cl_(2) and [Co(ONO)(NH_(3))_(5)]Cl_(2)`
`[CoBr(NH_(3))_(5)]SO_(4) and [Co(SO)_(4))(NH_(3))_(5)]Br`

Solution :`[CoBr(NH_(3))_(5)]SO_(4) hArr [CoBr(NH_(3))_(5)]^(2+)+SO_(4)^(2-), "Total CHARGES"=4`
`[Co(SO_(4))(NH_(3))_(5)Br hArr [Co(SO_(4))(NH_(3))_(5)]^(+)+Br^(-),"total charges"=2`
Hence, both have DIFFERENT molar CONDUCTIVITIES.
Discussion
869.

Write IUPAC name of coordination isomer of [Co(NH_(3))_(6)][Cr(CN)_(6)].

Answer»

Solution :Coordination isomer is `[CR(NH_(3))_(6)][CO(CN)_(6)]`. Its name is hexaamminechromium(III) hexacyanocobaltate(III).
Discussion
870.

The time taken for 10% completion of a first order reaction is 20 min . Then for 19% completion the reaction will take :

Answer»

40 MINS
60 mins
30 mins
50 mins

Solution :(A)`K= (2.303)/(20) "log" (100)/(81) `
`k = (2.303)/(x) "log" (100)/(81)`
since (i) = (II)
`(2.303)/(20)"log" (100)/(90) = (2.303)/(x) "log" (100)/(81)`
`x= (20 "log"(100)/(81))/("log" (100)/(90))`
`= (20xx0.0915)/(0.046) = 40 ` min
Discussion
871.

Which one is not equal to zero for an ideal solution ?

Answer»

<P>`DELTA H_(MIX)`
`Delta S_(mix)`
`Delta V_(mix)`
`Delta P=P_("observed")-P_("Raoult")`

Solution :For an ideal solution `Delta S_(mix)GT 0`
Discussion
872.

What type of aldehydes undergo Cannizaro reaction?

Answer»

Solution :ALDEHYDES that do not have `alpha` - hydrogen ATOM undergo CANNIZARO reaction.
Eg: HCHO, `C_(6)H_(5)CHO`.
Discussion
873.

Which of the following reactions will yield propan-2-ol ? Select the right answer from (a), (b), (c) and (d) I. CH_(2)=CH-CH_(3)+H_(2)O overset(H^(+))(rarr) II. CH_(3)-CHO overset(CH_(3)MgI//H_(2)O)(rarr) III. CH_(2)O underset(H_(2)O)overset(C_(2)H_(5)MgI)(rarr) IV. CH_(2)=CH-CH_(3) overset("Neutral "KMnO_(4))(rarr)

Answer»

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

Answer :A
Discussion
874.

Which one of the following cation will give a blue coloured ash when a piece of filter paper dipped in a solution containing its salt and Co(NO_3)_2 is burned?

Answer»

`Cu^(2+)`
`Mg^(2+)`
`AL^(3+)`
`ZN^(2+)`

SOLUTION :The filter paper ash test is substitute for cobalt nitrate charcoal cavity test. Double oxide `Al_(2)O_(3).CO O` formed is blue in colour.
Discussion
875.

What are enantiomers? Draw the structures of the possible enantiomers of 3-methylpent-1-ene.

Answer»

SOLUTION :
STEREOISOMERS which are non-superimposable mirror IMAGES of each other are called ENANTIOMERS. The enantiomers of 3-methylpent-1-ene are:
Discussion
876.

Which is manufactured by electrolysis of fused NaCl?

Answer»

NaOH
K
Ca
Zn

Solution :SODIUM MANUFACTURED by ELECTROLYSIS of FUSED NACL.
Discussion
877.

What are the uses of phenol?

Answer»

Solution :(i) About half of world production of PHENOL is used for making phenol formaldehyde resin. (Bakelite)
(ii) Phenol is a starting material for the preparation of
drugs such as phenacetin, Salol, aspirin, etc.
phenolphthalein indicator
explosive LIKE pieric ACID.
(iii) It is used as an antiseptic-CARBOLIC LOTION and carbolic soaps.
Discussion
878.

Which of the following representation is correct?

Answer»

<P>`._(6)C^(12)(._(1)H^(1),. _(0)n^(1)) ._(7)N^(13)`
`._(25)Mn^(55) (n,p)._(25)Mn^(56)`
`._(20)Ca^(40)(p,n) ._(21)Sc^(40)`
`._(4)Be^(5)(p,n). _(3)Li^(6)`

Answer :C
Discussion
879.

Unit for radioactive constant is

Answer»

`"Time"^(-1)`
Time
Mole - `"time"^(-1)`
Time - `"mole"^(-1)`

SOLUTION :The rate of disintegrations is EXPRESSED in TERMS of the number of disintegrations PER SECONDS
Discussion
880.

Which of the following will not undergo aldol condensation:

Answer»

Acetaldehyde
Propanaldehyde
Benzaldehyde
Trideutro Acetaldehyde

Answer :C
Discussion
881.

Which of the following gases gives a brown precipitate with FeSO_4 solution

Answer»

`N_2`
`NO`
`NO_2`
`N_2O_4`

Solution :No - GIVES brown preciptate with FRESH `FeSO_4` solution. No forms brown RING with `FeSO_4`
`FesO_4+5H_(2)O+NO rarr [UNDERSET("Brown ring")(Fe(H_2O)_(5)NO^(+))]SO_4`
Discussion
882.

There is no S-S bondin :

Answer»

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

ANSWER :C
Discussion
883.

What is the role of t-butyl peroxide in the polymerization of ethene ?

Answer»

Solution :t-butyl peroxide acts as a radical INITIATOR in the POLYMERIZATION of ethane. The t-butoxide radical formed as a result of THERMAL decomposition of t-butyl peroxide adds to ethene molecule to form growing radical

The growing radical chain (I) combines with more and ethene molecules to form bigger and bigger radical chains which ultimately get TERMINATE EITHER by combination or disproportiontion to yield polythene polyer.
Thus , the role of t-butyl peroxide is to start the process of polymerization.
Discussion
884.

What is inversion of sugar ?

Answer»

SOLUTION :Sucrose is dextrorotatory but on hydrolysis it GIVE an EQUIMOLAR mixture of `D-(+)` - glucose and `D-(-)` -fructose which is laevorotory. This CHANGE of specific rotation from dextrorotation to laevorotation iscalled inversion of SUGAR.
Discussion
885.

Which of the following is homologous of ethylene?

Answer»

`C_2H_2`
`C_3H_6`
`C_3H_8`
`C_3H_4`

ANSWER :C
Discussion
886.

Which of the following contains pungent odour :

Answer»

Esters
Higher ALDEHYDES
LOWER aldehydes
NONE

Answer :C
Discussion
887.

Which of the following molecules possess zero dipole moment?

Answer»

PF_3Cl_2
`SF_4`

ANSWER :B
Discussion
888.

Which of the following alkyl halides is used as a general anesthetic agent?

Answer»

`C_(2)H_(5)`CL
`C_(2)Cl_(6)`
`C_(6)H_(5)`l
`CF_(3)`CHClBr

Answer :D
Discussion
889.

Which of the following statements about ribose is incorrect ?

Answer»

It is polyhydroxy ketone
It is aldehyde sugar
It has FIVE CARBON atoms
It exhibits optical ACTIVITY

ANSWER :A
Discussion
890.

When propyne is treated with aqueous H_(2)SO_(4) in the presence of HgSO_(4), the major product is :

Answer»

propanal
propyl hydrogen sulphate
ACETONE
propanol

Solution :Alkynes undergoes Markovnikov's ADDITION of water in the presence of `H_2SO_4 // HgSO_4 `:
` CH_3- C -= C - H + H_2O underset(HgSO_4) OVERSET(H_2SO_4)to underset("UNSTABLE cool")([CH_3-overset(OH)overset(|)C= CH_2]) IFF underset("acetone")(CH_3-overset(O)overset(||)C-CH_3`
Discussion
891.

Which of the following sulphide(s) is (are) not decomposed with dil. H_(2)SO_(4)?

Answer»

`1`. PbS
`2`. CAS
`3`. NiS
`4`. CoS

Solution :PbS, CaS, NiS are not DECOMPOSED with dil. `H_(2)SO_(4)`
Discussion
892.

What happens when n-propyl benzene is oxidised using H^(+) // KMnO_4?

Answer»

Solution :When n - PROPYL BENZENE is oxidised with`H^(+) // KMnO_4`to gives benzoic ACID.
Discussion
893.

Which of the following elements can be involved in p pi - d pi bonding ?

Answer»

CARBON
Nitrogen
Phosphorus
BORON

Solution :Phosphorus belongs to 3rd period and hence CONTAINS d-orbitals which can FORM `p PI - d pi` bonds.
Discussion
894.

Which of the following complex(s) can not exhibit both geometrical and optical isomerism?

Answer»

`[RU(EN)_(3)]^(3+)`
`[Co(H_(2)O)Cl_(3)]`
`[PtBrCl(H_(2)O)NH_(3)]`
`[FeBr_(2)(en)_(2)]^(+)`

Answer :B
Discussion
895.

Write the IUPAC name and draw the structure of coordination entities of [PtCI(NH_(3))_(5)]Cl_(3).

Answer»

Solution :IUPAC name of the COMPOUND is : Pentaamminechloridoplatinum(IV) chloride. It has octahedral STRUCTURE as shown.
Discussion
896.

Which is correct statement for dextrin ?

Answer»

It cannot be HYDROLYZED
It is WATER SOLUBLE
It is TASTELESS
It is KNOWN as sugar

Solution :It is tasteless
Discussion
897.

The sugar present in DNA and RNA is ……………

Answer»

ALDOPENTOSES
Aldotrioses
Ketopentoses
Ketotrioses

SOLUTION :Aldopentoses
RIBOSE SUGAR is ALDOPENTOSE.
Discussion
898.

Write the formuta of the following coordination compound. Iron (III) hexacyanoferrate (II)

Answer»

SOLUTION :`FE[Fe(CN)_6]_3`
Discussion
899.

The unstable compounds are

Answer»

`MnI_7`
`CrO_3`
`Mn_2O_7`
`CrI_6`

Solution :Mn, CR are STABLE is +7,+6,o.s with oxides
Discussion
900.

When 22.4 litres of H_(2)(g) is mixed with 11.2 litres of Cl_(2)(g), each at S.T.P., the moles of HCl (g) formed is equal to

Answer»

1 mol of HCl (g)
2 mol of HCl (g)
0.5 mol ofHCl (g)
1.5 mol of HCl (g)

SOLUTION :22.4 L of `H_(2)` = 1 mol of `H_(2)`
11.2 L of `Cl_(2)=(11.2)/(22.4)"mol = 0.5 mol of "Cl_(2)`
`UNDERSET("1 mol")(H_(2)(g))+underset("1 mol")(Cl_(2)(g))rarrunderset("2 mol")(2HCl)(g)`
Thus, `Cl_(2)` will be the limiting reagent and HCl formed by reaction of 0.5 mol of `Cl_(2)=1` mol
Discussion