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.

15301.

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49u. Molecular mass of B will be :

Answer»

50.00u
12.25u
6.50u
25.00u

Solution :`(r_(A))/( r_(B)) = sqrt(( M_(B))/( M_(A)))`
`( V//20)/( V//10) = sqrt((M_(B))/( 49))`
`(1)/(2) = sqrt((M_(B))/(49)) :. M_( B) = 49 xx (1)/( 4) = 12.25 `
Discussion
15302.

When water is cooled to ice its entropy

Answer»

Increases
Decreases
Remains same
Becomes zero

Solution :When water freezes to FORM ICE, the randomness or DISORDERLINESS decreases i.e., entropy decreases.
Discussion
15303.

Which of the following equation shows relation between DeltaG^@ and equilibrium constant K?

Answer»

`DeltaG^(@) = RT lnK`
`DeltaG^(@) = -RT lnK`
`DeltaG^(@) = (RT)/(N) K`
`K = (DeltaG^(@))/(RT ln)` 

ANSWER :B
Discussion
15304.

Which of the following elements is a lanthanide (Rare-earth element)

Answer»

Cadmium
Californium
Cerium
Cesium

Answer :C
Discussion
15305.

Which of the carbon atom present in the molecule given below are asymmetric.

Answer»

1,2,3,4
2,3
1,4
1,2,3

Answer :B
Discussion
15306.

What kind of solids show electrical conductivity in solid as well as molten states ?

Answer»

SOLUTION :METALLIC SOLIDS
Discussion
15307.

Which of the following graphs is correct for a zero order reaction?

Answer»




Solution :Zero order reaction :`RtoP`
differential rate law :`(d[R])/(dt)=k`
For zero order reaction
Integrated rate law:`KT=[R]_(0)-[R]`
`thereforeunderset(y)underset(uarr)[R]=underset(m)underset(uarr)-k underset(x)underset(uarr)t+underset(c)underset(uarr)([R]_(0))`
This equation (i) is LIKE y=mx+c
so ,`[R]tot` graph linear and the value of slope is NEGATIVE .This is option (D).
`kt=[R]_(0)-[R]`
`therefore-kt[R]-[R]_(0)`
`therefore ([R]-[R]_(0))/(t)=-kt^(0)`
`therefore` Rate `prop t^(0)`
So rate `to` TIME graph is option (A).
Discussion
15308.

Which of the following concentration of matals in drinking water is not prescribed-

Answer»

FE 0.2 PPM
Cu 3.0 ppm
CD 2.0 ppm
Zn 5.0 ppm

Answer :C
Discussion
15309.

What are the ferromagnetic substances ?

Answer»

Solution :These are the substances which arc strongly ATTRACTED towards the magnetic FIELD.
Discussion
15310.

Which one of the following is an example for mixed ether?

Answer»

Methoxy methane
Phenoxy BENZENE
Methoxy benzene
Ethoxy ETHANE

SOLUTION :Methoxy benzene
Discussion
15311.

When phenol reacts with acid chloride/acid anhydried in presence of anhydrous AlCl_(3), gives phenolic ketone. This process is known as……..

Answer»

LUCAS TEST
FRIES REARRANGEMENT
Williamson's process
Tollen's test

SOLUTION :Fries rearrangement
Discussion
15312.

Which gives violet colour with borax?

Answer»

Fe
Pb
Co
Mn

Answer :d
Discussion
15313.

When moist coloured flowers are added into SO_(2) gas the flowers are decolourised because

Answer»

`SO_(2)` absorbscolouring matter
`SO_(2)` oxidised vegetable colouringmatter
`SO_(2)` REDUCES VEGETALE COLOURING matter
`SO_(2)` gives clourless PRODUCT

Answer :C
Discussion
15314.

Which one statement about sulphur dioxide gas is incorrect

Answer»

It has an ANGULAR shape
it DECOLOURISES acidified POTASSIUM permanganate solution
Two S-O bonds are EQUAL
It is a dehydrating agent

Solution :`SO_(2)` is not a dehydrating agent.
Discussion
15315.

Which of the following methods can be used to produce phosphine gas ?

Answer»

`Ca_(3)P_(2)+H_(2)O rarr`
`PH_(4)I+KOH rarr`
Heating of `H_(3)PO_(2)`
WHITE `P+NaOH underset("atmosphere")overset("Inert")rarr`

Answer :A::B::C::D
Discussion
15316.

Which of the following is/are correct regarding activation energy?

Answer»

Larger the activation energy, SMALLER is the value of RATE constant.
The higher the `E_a`, higher the value of temperature coefficient, `(k_T+10)/(k_T)`.
At lower temperature, increase in temperature causes more change in the value of k than at higher temperature.
A plot made between INK and `1//T` gives a STRAIGHT line of slope `-(E_a)/(R)`

SOLUTION :As temperatureincreases, rate of reaction also increases and hence `E_a` decreases.
A plot between In k and `1/T` gives straight line.
Discussion
15317.

What is the meant by rate constant k of a reaction?

Answer»

Solution :RATE CONSTANT(k) is the rate of a REACTION when the MOLAR concentration of each reactant is unit or 1 mol `L^(-1)`
Discussion
15318.

What happens when gelatin is mixed with a gold sol?

Answer»

SOLUTION :GELATIN STABILIZES the GOLD SOL.
Discussion
15319.

When carbon monoxide is passed over solid caustic soda heated to 200^(@) C , it forms

Answer»

`HCOONA`
`2CH_(3)COONa`
`Na_(2)CO_(3)`
`NaHCO_(3)`

Solution :When carbon monoxide is passed over solid caustic soda heated to `200^(@)` , it FORMS sodium formate.
`CO+NaOHunderset(200^(@)C)overset(heated)tounderset("Sodium formate")(HCOONa)`
Discussion
15320.

Use Hund's urle to derive the electronic configuration of Ce^(3+) ion and calculate its magnetic moment on the basis of spin only formul .

Answer»

Solution :`._(58)Ce= [Xe]^(54) 4f^(1) 5d^(1) 6s^(2)`
`Ce^(3+) = [Xe]^(54) 4f^(1) , i.e., `THEREIS only ONE unpaired electron, i.e., `n=1`. Hence,
`mu = SQRT(n(n+2)) BM = sqrt(1( 1+2)) = sqrt( 3) BM= 1.73BM`
Discussion
15321.

Which kind of isomerism is possible for 1-chloro-2-nitroethene

Answer»

Functional group isomerism
Position isomerism
E/Z isomerism
Optical isomerism

Solution :`underset("1-1chloro-2-nitroethene")(O_(2)NHC = CHCl)`
For HIGHLY substituted alkenes E and Z system of nomenclature is sued, which is BASED on a POLARITY system developed by Cahn, Ingold and PRELOG.
Discussion
15322.

There is O-O bond in:

Answer»

`S_2O_8^(2-)`
`S_4O_6^(2-)`
`SO_3^(2-)`
`S_2O_7^(2-)`

ANSWER :A
Discussion
15323.

Which of the following solutes will produce the largest total molality of solute particles upon addition to 1kg of water ?

Answer»

`1.0` MOLE `Co(NO_(3))_(2)`
`2.0` mole `KCl`
`3.0` mole `C_(2)H_(5)OH`
`3.0` mole of sugar

Answer :B
Discussion
15324.

What do you mean by the term chemotherapy ?

Answer»

Solution :CHEMOTHERAPY is the TREATMENT of DISEASES with the help of chemicals.
Discussion
15325.

Two organic compounds containing C=62.1%, H = 10.34%,O= 27.6% with KCNand H_2SO_4gave compounds which on hydrolysis gave two isomeric monobasic acids with molecular mass 104. Name the compounds and also the third isomer.

Answer»

SOLUTION :
Discussion
15326.

Which one of the following is an addition polymer ?

Answer»

Bakelite
Nylon-6,6
Polystyrene
Terylene

Answer :C
Discussion
15327.

Write the balanced equation for the following reaction. NaCl is heated with sulphuric acid in the presence of MnO_(2).

Answer»

Solution :`Cl_(2)` gas is evolved according to following equations :
`{:(""4 NaCl + 4 H_(2)SO_(4) + MnO_(2) overset(DELTA)rarr 4 NaHSO_(4) + MnCl_(2)+2Cl_(2) + 2 H_(2)O),(or""4 NaCl + 2H_(2)SO_(4)+MnO_(2) overset(Delta)rarr 2Na_(2)SO_(4)+MnCl_(2)+2Cl_(2)+2H_(2)O):}`
Discussion
15328.

Which of the following is not used as antacids?

Answer»

`MG(OH)_(2)`
KOH
`AI(OH)_(3)`
MIXTURE of `MG(OH)_(2)` and`AI(OH)_(3)`

Answer :B
Discussion
15329.

Whichof thefollowingaminehas lesstendencyto acceptprotonformacid

Answer»




ANSWER :B
Discussion
15330.

What is mant bythe following terms? Give an example in each case. (i) Cyanohydrin (ii) acetal, (iii) Semicarbazone, (iv) Aldol, (v) Hemiacetal, (vi) Oxime, (vii) Ketal, (viii) Imine, (ix) 2,4-DNP derivative (x) Schiff's base.

Answer»

Solution :(i) Gem-Hydroxynitriles, i.e., compounds POSSESSING hydroxyl and cyano GROUPS on the same carbon ATOM are called cyanohydrins. These are produced by addition of HCN to aldehydes or ketones in weakly basic medium.

Cyanohydrins are useful synthetic reagents because they are used to prepare `alpha`-hydroxyacids. for example,
.
(ii) gen-Dialkoxyalkanes in which the two alkoxy groups are present on the terminal carbon atom are called ACETALS. these are produced by the action of an aldehyde with two equivalents of a monohydric alcohol in presence of dry HCl gas.
.
These are easily hydrolysed by dilute mineral acids to regerate the original aldehydes. therefore, these are used for the protection of aldehyde group in organic synthesis.
(iii) Semicarbazones are derivatives of aldehydes and ketones and are produced by the action of semicarbazide on them in weakly acidic medium.
.
These are used for identification and characterization of aldehydes and ketones.
(iv) Aldols are `beta`-hydroxyalehydes or ketones and are produced bythe condensation of two molecules of the same or one molecule each of two different aldehydes or ketones in presence of a dilute aqueous base. for example.
.
.
(v) `alpha`-Alkoxyalcohols are called hemiacetals. these are produced y addition of one molecule of a monohydric alcohol to an aldehyde in prsence of dry HCl gas.

(vi) Oximes are produced when aldehydes or ketones react with hydroxylamine in weakly acidic medium.

(vii). gem-Dialkoxyalkanes in which the two alkoxy groups are present on the same carbon within the chain are called ketals. these are produced when a ketone is heated with ethylene glycol in presence of dry HCl gas or p-toluenesulphonic acid (PTS).
.
These are easily hydrolysed by dilute mineral acids to regenerate the orginal ketones. therefore, ketals are used for protection of keto groups in organic synthesis.
(viii). Compounds containing group are called imines. these are produced when aldehydes and ketones react with ammonia and its derivatives.

`Z=H,` alkyl, aryl, `-NH,-OH,-NHC_(6)H_(5),-NHCOCH_(2)`, etc.
(ix) 2,4-Dinitrophenylhydrazones (i.e., 2,4-DNP derivatives) are produced when aldehydes or ketones react with 2,4-dinitropheylhydrazine in weakly acidic medium.

2,4-DNP derivatives are used for identification and characterisation of aldehydes and ketones. (x) Aldehydes and ketones react with primary aliphatic or aromatic amines in presence of trace of an acid to form azomethines or Schiff's bases. Schiff's bases may ALSO be regarded as imines.
Discussion
15331.

Write Nernst equation for the redox reaction occurring in the following galvanic cells. (i) Pt|Fe^(2+),Fe^(3+)||H^(+),Cr_(2)O_(7)^(2-), Cr^(3+)|Pt (ii) Pt|H_(2)("g, p atm")|H^(+)||Cl^(-)|Hg_(2)Cl_(2)(s)|Hg (iii) Ag|AgCl(s)|Cl^(-)||Ag^(+)|Ag (iv) Pt|I_(2)(s)|I^(-)||Br^(-)|Br_(2)(l)|Pt (All at 25^(@)C)

Answer»

SOLUTION :
Discussion
15332.

What is obtained when nitrobenzene is treated sequentially with (i) NH_(4)Cl//Zn dust and (ii) H_(2)SO_(4)//Na_(2)Cr_(2)O_(7)

Answer»

m-chlorobenzene
p-chloronitrobenzene
nitroso benzene
benzene.

Solution :
Discussion
15333.

Two pungent smelling gases bleach a certain sbstances. The gases may be:

Answer»

`Cl_2` and `SO_2`
`Cl_2` and `NH_3`
`NH_3` and `PH_3`
`O_2` and `CO_2`

ANSWER :A
Discussion
15334.

Which of the following compounds would not react wiith Lucas reagent at room temperature?

Answer»

`H_(2)C=CHCH_(2)OH`
`C_(6)H_(5)-CH_(2)OH`
`CH_(3)CH_(2)CH_(2)OH`
`(CH_(3))_(3)COH`

Solution :Benzyl and allyl alcohols react as rapidly as `3^(@)` alcohols. Only `1^(@)` alcohol do not react with Lucas REAGENT at room TEMPERATURE, i.e., option (c) is CORRECT.
Discussion
15335.

Which one of the following has maximum laevorotatory nature ?

Answer»

D-glucose
D-fructose
Sucrose
INVERT SUGAR.

ANSWER :B
Discussion
15336.

What is the major product in the reaction ? CH_(3) - CH = CH_(2) + HBr overset((C_(6)H_(5)CO)_(2)O_(2))rarr

Answer»

`CH_(3) - CH_(2) - CH_(2)BR`
`CH_(3) - underset(Br)underset(|)(CH) - CH_(3)`
`underset(Br)underset(|)(CH_(2))-underset(Br)underset(|)(CH) - CH_(3)`
`underset(Br)underset(|)(CH_(2)) - CH = CH_(2)`

SOLUTION :`CH_(3) - CH = CH_(2) underset("Peroxides")overset(HBr)rarr CH_(3) - underset(H)underset(|)(CH) - CH_(2)Br`
In the presence of peroxides, the reaction PROCEEDS as anti-Markovnikov.s reaction.
Discussion
15337.

Which of the following statements is /are correct?

Answer»

For all VALUES of n, the p-orbitals have the same shape, but the OVERALL size increases as in increase, for a GIVEN atom
The fact that there is a particular direction ALONG which each p-orbital has maximum electron density, plays an IMPORTANT role in determining molecular geometries
The charge cloud of a single electron in `2p_(x)` atomic orbital consists of two lobes of electron density.
None is correct.

Answer :A::B::C
Discussion
15338.

What are the hydrolysis products of (i) Sucrose (ii) Lactose ?

Answer»

SOLUTION :Both sucrose and lactose are dissaccharides. Sucrose on hydrolysis gives one molecule each of glucose and fructose but lactose on hydrolysis gives one molecule each of glucose and galactose.
`underset("Sucrose")(C_12 H_22 O_(11)) +H_(2)Ooverset(H_(3)O^(+))underset("or Invertase")to underset(D-(+)-"Glucose")(C_(6)H_(12)O_(6))+underset(D-(-)-"Fructose")(C_(6)H_(12O_(6))`
`underset("Lactose")(C_12 H_22 O_(11)) +H_(2)Ooverset(H_(3)O^(+))underset("or Lactose")to underset(D-(+)-"Glucose")(C_(6)H_(12)O_(6))+underset(D-(+)-"Galactose")(C_(6)H_(12O_(6))`
Discussion
15339.

Which of the following is an example of a geminal Halide ?

Answer»

1, 2 - dichloropropane
1,4 - DICHLOROBUTANE
2-chlorobutane
1,1-dichloropropane

ANSWER :D
Discussion
15340.

Which of the following reacts with water to form very stable product ?

Answer»

`CH_(3)CL`
`C Cl_(4)`
`C Cl_(3)CHO`
`CH_(2)ClCH_(2)Cl`

ANSWER :C
Discussion
15341.

Which of the following is correctly matched ?

Answer»

`CH_3-CH_2-NH-CH_2-CH_3` & `CH_3-NH-CH_2CH_2CH_3`Chain isomers
`CH_3-overset(CH_3)overset|CH-NH_2` & `CH_3-NH_2-CH_3`FUNCTIONAL GROUP isomers

Solution :(1) Metamers
(2) Functional group isomers
(3) Functional group isomers
(4) Functional group isomers
Discussion
15342.

To reduce nitrobenzene to aniline, 20 g of C_(6)H_(5)NO_(2), 30 cc of an alcohol, 250 cc of water , 11 g of HCl and 1g of SnCl_(2).2H_(2)O were placed in the cathode space. After passing current at a rate of 26.5 amp-hour through the lead cathode electrolytic cell, 12-76 g of aniline was produced. Determine the current yield.

Answer»


ANSWER :0.8438
Discussion
15343.

Which is lewis acid ?

Answer»

`CL^`
`NH_3`
`H_2O`
`BF_3`

ANSWER :D
Discussion
15344.

What is crystal field splitting energy ? How does the magnitude of Delta_(0) decide the actual configuration of d-orbitals in a coordination entity ?

Answer»

Solution :When ligands APPROACH a transition metal ion, the d-orbitals split into two sets, one with LOWER energy and the other with higher energy. The difference of energy between the two sets of orbitals is called crystal FIELD splitting energy (`Delta_(0)` for octahedral field).
If `Delta_(0)LTP` (pairing energy), the 4th electron enters one of hte `e_(g)` orbitals giving the configuration `t_(2g)^(3)e_(g)^(1)` thus forming high spin complexes. Such ligands for which `Delta_(0)ltP` are called weak field ligands.
If `Delta_(0)gtP`, the 4th electron pairs up in one of the `t_(2g)` orbitals giving the configuration `t_(2g)^(4)e_(g)^(0)` thereby forming low spin complexes. Such ligands for which `Delta_(0)gtP` are called strong field ligands.
Discussion
15345.

Which of the following coordination compounds would exhibit optical isomerism and it is low spin complex

Answer»

`[Cr(EN)_(3)]^(+3)`
`[NI(gly)_(3)]^(Theta)`
`[PT(BN)_(2)]^(2o+)`
All of these

Answer :C
Discussion
15346.

What is the shape of hexacyanoferrate (II) ion ?

Answer»

SOLUTION :OCTAHEDRAL
Discussion
15347.

Which of the following does not react with O_2 directly Zn, Ti,Pt, Fe?

Answer»

Solution :PT does not REACT directly with `O_2` It is a NOBLE METAL.
Discussion
15348.

The splitting of an ester by an alcohol is known as:

Answer»

Acidolysis
Alcoholysis
Ammonolysis
Hydrolysis

Answer :B
Discussion
15349.

What is the role of Limestone in the extraction of Iron from its oxide Fe_(2)O_(3) ?

Answer»

Solution :In the extraction of iron ,a basic flux limestone is used .Limestone decomposes to form CaO which reacts with silica gangue present in the iron ORE is acidic in NATURE to form calcium silicate (slag).
`CaCotoCaO+CO_(2)`
`underset("flux")(CaO)+SiO_(2)tounderset("slag")(CaSiO_(3))`
Discussion
15350.

When E_(Ag^+//Ag)^(o)=0.8 volt and E_(Zn^(2+)//Zn)^(o)=-0.76 volt, which of the following is correct

Answer»

`AG^(+)` can be reduced by `H_(2)`
Ag can oxidise `H_(2)` into `H^(+)`
`Zn^(2+)` can be reduced by `H_(2)`
Ag and reduce `Zn^(2+)` ion

Solution :Because `H_(2)` has greater reduction potential so it reduced at `Ag^(+)`.
Discussion