Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Which is not a nucleophilic addition reaction :

Answer»

`RCHO + NaHSO_3 rarr RCH(OH)SO_3Na`
`RCHO + 2H rarr RCH_2OH`
`RCHO + HCN rarr RCH(OH)CN`
`RCHO + NH_3 rarr RCH(OH)NH_2`

Answer :B
Discussion
2.

Which aldehydes are formed by the reductive ozonolysis of penta, -1, -3, - diene ?

Answer»

SOLUTION :Formaldehyde, ACETALDEHYDE and GLYOXAL are formed by the OZONOLYSIS of penta-1,3-diene
`CH_(2) = CH- CH= CH- CH_(3) + O_(3) underset(Zn)overset(H_(2)O)rarr CH_(2)O + OHC CHO + CH_(3)CHO`
Discussion
3.

which one is soluble in NaOH :-

Answer»

N-ETHYL benzensulphonamide
N-N, DI ethyl benzensulphonamide
N-ethyl aniline
N-methl ETHANAMINE

ANSWER :A
Discussion
4.

Which one of the following statements is incorrect in the case of heterogeneous catalyst ?

Answer»

The catalyst lowers the energy of activation
The catalyst ACTUALLY forms a compound with the REACTANT
The surface of the catalyst plays a very IMPORTANT role
There is no change in the energy of activation.

Answer :D
Discussion
5.

When H_2S is passed through an ammoniacal salt solution X, a dirty white precipitate is obtained. The X can be a

Answer»

cobalt salt
nickel salt
MANGANESE salt
zinc salt

Solution :Zinc salt solution on passing `H_2 S` in PRESENCE of `NH_4OH` GIVES a WHITE or dirty white ppt. of ZnS.
Discussion
6.

Write the name of coordination compound [Co(NH_3)_5Cl] Cl_2.

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SOLUTION :Chloropentamine COBALT (III) CHLORIDE.
Discussion
7.

Which one of the following is not a compound ?

Answer»

MARBLE
Ozone
Carborundum
Quicklime

Answer :B
Discussion
8.

According to kinetic theory of gases, for a datomic molecule.

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The root mean square VELOCITY is inversely proportional to the temperature
The pressure exerted by the GAS is proportional to the root mean square velocity of the molecules
The mean translational kinetic ENERGY of the molecules is proportional to the ABSOLUTE temperature
The pressure exerted by the gas is proportional to themean velocity of the molecules

Answer :D
Discussion
9.

Write equation for the synthesisof Buna - S .

Answer»

Solution :Buna - S is prepared by additionpolymerisationof buta - 1, 3- diene and STYRENE.
`UNDERSET("Buta-1,3-diene")(nCH_(2))=CH- CH_(2) +underset("Styrene")underset(C_(6)H_(5))underset(|)(nCH) = CH_(2) OVERSET(Na) to underset("Buna-S")((-CH_(2) - CH =CH-CH_(2) - underset(C_(6)H_(5))underset(|)(CH) - CH_(2)-)_(n)`
Discussion
10.

Which of the following reactions with yield 2,2-dibromopropane?

Answer»

`CH_(3)-C-=CH+2HBr to`
`CH_(3)C-=CH+HB R to`
`CH-=CH+2HB RTO`
`CH_(3)C-=CBr+HB rto`.

SOLUTION :
Discussion
11.

Which of the following bicarbonate can not exist in solid state :-

Answer»

`LiHCO_(3)`
`RB(HCO_(3))`
`NaHCO_(3)`
`KHCO_(3)`

ANSWER :A
Discussion
12.

Which of the following is an example of octahedal complex?

Answer»

`[FeF_(6)^(-)]^(3-)`
`[ZN(NH_(3))_(4)]^(3+)`
`[Ni(CN)_(4)]^(2-)`
`[Cu(NH_(3))_(4)]^(3+)`

ANSWER :A
Discussion
13.

Write the structures of A,B and C in the following: CH_(3)-Cl overset(KCN)to A overset(LiAlH_(4))to B overset(CHCl_(3)+alc." KOH")toC

Answer»

Solution :`underset("Chloromethane")(CH_(3)Cl) underset("Nacleophilic substitution (-KCl)")overset(KCN)to underset("Ethanetrile (A)")(CH_(3)-CN) underset(("Reducaton"))overset(LiAlH_(4))to underset("ETHANAMINE (B)")(CH_(3)-CH_(2)NH_(2)) underset(("Carbylamine reaction"))overset(CHCl_(3)+acl." "KOH,DELTA)to underset("Ethyl carbylamine (C)")(CH_(3)CH_(2)-N overset(to)(=)C)`
Discussion
14.

Which of the following are square planar complexes ? (i) [AuCl_(4)]^(-) (ii)[PtCl_(4)]^(2-) (iii)[Mn(Br)_(4)]^(2-) (iv) [Cu (NH_(3) )_(4) ]^(2+) Select the correct answer using the codes given below: -

Answer»

i and II only
ii and III only
ii and IV only
i, ii, and iv only

Answer :D
Discussion
15.

Toluene di-isocyanate is used to prepare:

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Ployesters
Polyamides
Ploycarbonates
Ployurethanes

Answer :D
Discussion
16.

Which of the following crystal has unit cell such that aa neb ne c and alphane beta ne gamma ne 90^(@)

Answer»

`NaNO_(3)`
`K_(2)SO_(4)`
`KNO_(3)`
`K_(2)Cr_(2)O_(7)`

Answer :D
Discussion
17.

Which one of the following is not formed when a mixture of methyl bromide and bromobenzene is heated with sodium metal in the presence of dry ether ?

Answer»

ETHANE
DIPHENYL
PROPANE
TOLUENE

SOLUTION :
Discussion
18.

What happens when benzene diazonium chloride is heated with water ?

Answer»

Solution :`to` When phenol is reacted with benzene DIAZONIUM CHLORIDE, phenol is OBTAINED.
Discussion
19.

Which one is a monomer of natural rubber ?

Answer»

`(CH_(3))_(2)-C=CH-CH_(3)`
`CH_(3)-CH=CH-CH_(3)`
`CH_(2)=underset(CH_(3))underset("|")"C "-CH=CH_(2)`
`CH_(2)=underset(CH_(3))underset("|")"C "-underset(CH_(3))underset("|")"C "=CH_(2)`

ANSWER :C
Discussion
20.

What type substances would make better permanent magnets, ferromagnetic or ferrimagnetic ?

Answer»

SOLUTION :FERROMAGNETIC SUBSTANCES.
Discussion
21.

What type of substance is phenylalanine hydroxylate ? What is its importance for us?

Answer»

SOLUTION : It is an ENZYME whose DEFICIENCY CAUSES MENTAL retardation.
Discussion
22.

The vapour pressure of pure liquid A at 300K is 577 Torr and that of pure liquid B is 390 Torr. These two compounds form ideal liquid and gaseous mixtures. Consider the equilibrium composition of a mixture in which the mole fraction of A in the vapour is 0.35. Calculate the total pressure of the vapour and the composition of the liquid mixture.

Answer»

<P>

Solution :A and B volatile liquids, given `P_(A^(0)=575` Torr, `P_(B^(0)=390` Torr
let mole fraction of `A` in solution `=X_(A)`
HENCE, `P_("total")=P_(A^(0)X_(A)+P_(B)^(0)(1-X_(A))`
also `X_(A)=` ,p,e fraction of A in the vapour `=0.35`
`X_(A)=(P_(A)^(@)X_(A))/(P_(A)^(@)X_(A)+P_(B)^(@)(1-X_(A))=0.35`
`=(575X_(A))/(575X_(A)+390(1-X_(A))`
this GIVES `X_(A)=0.27`
hence, total pressure
`P_("total")=575xx0.27+390xx0.73`
`=440` Torr
Composition of liquid MIXTURE,
`A=27` mol `%,B=73` mol `%`
total pressure `=440` Torr
Discussion
23.

The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 308 K.If the value ofA is 4xx10^(10)S^(-1).Calculate k at 318 K and E_(a)

Answer»

Solution :`T_(1)`=298,time =`t_(1)`
If initial concentration =`[R]_(0) mol L^(-1)`
The reaction is COMPLETE 10% ,so 90% reactant will be reamain.
`therefore[R]_(t)=0.9[R]_(0) mol L^(-1)`
`therefore` log `k_(298)=(2.303)/(t_(1)) log [R_(0)]/(0.9 [R]_(0))=(2.303)/(t_(1))` log `(1)/(0.9)`
`therefore t_(1)=(2.303)/(log k_(298))xx0.04575`
`therefore t_(1)=(0.1054)/(log k_(298))`
Inintial concentration =`[R]_(0) mol L^(-1),T_(2)`=308 K .
The 25% reaction is complete in t time.
`therefore` The concentration after completion of 75%
reaction=75% of `[R]_(0)`
`therefore [R]_(t)=0.75[R]_(0) mol L^(-1)`
`k_(308)=(2.303)/(t_(2))xxlog ([R]_(0))/(0.75 [R]_(0))`
`(2.303)/(t_(2))xxlog 1.3333=(2.303xx0.1249)/(t_(2))`
`therefore t_(2)=(0.2878)/(log k_(308))`........(2)
But `t_(1)=t_(2)`
`therefore (0.1059)/(k_((298)))=(0.2878)/(k_((308)))`
`therefore (K_((308)))/(k_((298)))=(0.2878)/(0.1059)=2.717` ..........(3)
Calculation of `E_(a)` :`=4XX10^(10)s^(-1)` so, at 318 K temperature k=(?)`E_(a)` (?)
`therefore (log K_(2))/(log k_(1))=(E_(a))/(2.303xx8.314)((308-298)/(308xx298))`
`therefore` log 2.717=`(E_(a))/(2.303xx8.314)xx(10)/(308xx298)`
`therefore E_(a)=75990.0 J mol^(-1)` Calculation of k at 318 k temperature:
logk=log A-`(E_(a))/(2.303 RT)`
`=log 4xx10^(10)-(75990 mol^(-1))/(2.303xx8.314 JK^(-1) mol^(-1)xx318 K)` `therefore`=Anilog 2.218=`1.327xx10^(-2)s^(-1)`
`therefore` k=0.013267 `s^(-1)~~0.013 s^(-1)`
Discussion
24.

What happens to freezing point of benzene when nephthalens is added ?

Answer»

increases with increases in temperature.
DECREASES
remians unchanged
first decreases and then increases.

Solution :FREEZING POINT temperatue of BENZENE decreases.
Discussion
25.

Which are correct statements

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REVERSE osmosis is used desalination of sea water
Vant Hoff's factor decreases UPON dilution
OSMOTIC pressure associated with the fluid inside the blood cell is EQUIVALENT to that of `0.9%`(w//v) NaCl solution
Units of `K_(f) and K_(b)` are same and it is K `"Kgmol"^(-1)`

Answer :A::C::D
Discussion
26.

Two electrolytic cell are attached in series and current is passing through them. First electrolytic cell X(NO_(3))_(3(aq)) and second electrolytic cell posses Y(NO_(3))_(2) and molecular mass of X and Y are 1:2 respectively. Hence what is the ratio of lierated mass ?

Answer»

`3:2`
`1:2`
`1:3`
`3:1`

Solution :OXIDATION STATE of X and Y are `X^(3+) and Y^(2+)` respectively,
Molecular MASS ratio=1:2 and so EQUIVALENT mass`=(1)/(3):(2)/(2) or 1:3`.
Discussion
27.

What type of bonding helps in stabilising the alpha-helix structure of proteins ?

Answer»

SOLUTION :The `alpha`-helix STRUCTURE of PROTEINS is STABILIZED by intramolecular H-bonding between `C=O` of one amino acid RESIDUE and the `N-H` of the fourth amino acid residue in the chain.
Discussion
28.

Which of the followingd blockelementhas halffilledpenultimate d subshellas well as halffilledvalencesubshell ?

Answer»

CR
PD
PT
NONE of these

ANSWER :A
Discussion
29.

Which of the following will reduce alcohol ?

Answer»

<P>RED P
Black P
White P
None of these

Solution :Red P
Discussion
30.

The strongest base among the following is :

Answer»

`CH_3^-`
`F^-`
`NH_2^-`
`OH^-`

ANSWER :A
Discussion
31.

Which of the following will have the highest boiling point at 1 atm pressure:

Answer»

0.1 M NaCl
0.1 M Sucrose
0.1 M `BaCl_2`
0.1 M Glucose

Answer :C
Discussion
32.

Which of the following statements are correct : (A) The coordination number of each type of ion in CsCl is 8. (B) A metal that crystallises in BCC structure has a coordination number 12. (C) A unit cell of an ionic crystal shares some of its ions with other unit cells (D) The length of the unit cell in NaCl is 552 pm.[r_(Na^(+))=95pm,r_(cl^(-))=181pm]

Answer»

SOLUTION :`r_(+) + r_(–) = a//2`
(95 + 181)=` a//2`
`implies a = 276 x× 2`
a = 552 pm.
Discussion
33.

When SO_2 gas is passed through acidified K_2Cr_2O_7 solution, the colour of the solution changes to

Answer»

RED
BLACK
ORANGE
GREEN

SOLUTION :Green
Discussion
34.

Write the role of the following : (i) NaAlF_(4) in the extraction of Aluminium (ii) CO in the refining of Ni.

Answer»

Solution :(i) `NaAIF_(4)` in the extraction of Aluminium
`NaAlF_(4)` lowers the meelting point of `Al_(2)O_(3)` and increases CONDUCTIVITY to speed up the deposition of aluminium.
(ii) CO in the refining of Ni
CO forms a VOLATILE complex named NICKEL tetracarbonyl. This complex is decomposed at higher temperature to obtain pure nickel.
Discussion
35.

Which of the following is the size of the colloidal particle?

Answer»

`100 MU m` DIAMETER - `1000mu m` diameter
`1 m mu `to 1 ` mu m` diameter
`1 m mu ` to `100 mu m` diameter
`1MU m` to `1mu m` diameter

Solution :`1 m mu `to 1 ` mu m` diameter
Discussion
36.

Which statement is true about the most stable Lewis structure for CS_(2) ?

Answer»

There are no LONE pairs in molecule
All bonds are double bonds
The central atom does not have an octet of electrons
A SULFUR atom must be the central atom for the structure to be stable

Solution :
Total lone pairs =4 `"" ` Total double bond=2
All the atoms have COMPLETE octet SULPHUR is the central atom.
Discussion
37.

Which pairs contains both ambidentate and flexidentate?

Answer»

`CO_(3)^(2-),CN^(-)`
`CO_(3)^(2-),NO_(3)^(-)`
`S_(2)O_(3)^(2-),CO_(3)^(2-)`
`CN^(-),NO_(2)^(-)`

ANSWER :A
Discussion
38.

What is D in the following sequence of reactions ?

Answer»




SOLUTION :
Discussion
39.

The substance which possesses zero resistance as 0 K:

Answer»

Conductor
Super conductor
Insulator
Semiconductor

Answer :B
Discussion
40.

Which one of the following is called as Zeise's salt ?

Answer»

`[Pt(NH_(3))_(4)][PtCl_(4)]`
`K[PtCl_(3)(C_(2)H_(4))]`
`K_(4)[Fe(CN)_(6)]`
`[Fe(CO)_(5)]`

Answer :B::C::D
Discussion
41.

Which of following is correct :

Answer»

All ALDEHYDES undergo Cannizzaro's reaction
Aldehydes are less susceptible to oxidation than ketones
Aldehydes are more susceptible oxidation than ketones
Formaldehyde FORMS `CH_3(OH)NH_2` with `NH_3`

ANSWER :C
Discussion
42.

Zinc carbonate is precipitated from zinc sulphate solution by the addition of:

Answer»

`Na_(2)CO_(3)`
`CaCO_(3)`
`MgCO_(3)`
`NaHCO_(3)`

ANSWER :D
Discussion
43.

Which of the following crystal systems does not have body-centred lattice-

Answer»

orthorhombic
tetragonal
monoclinic
cubic

Answer :C
Discussion
44.

Which of the following is a semi synthetic polymer ?

Answer»

CELLULOSE NITRATE
Rayon
Vulcanized RUBBER
All of these

SOLUTION :All of these
Discussion
45.

What type of detergents are used for dish washing ?

Answer»

SOLUTION :NON ionic,i.e., POLYETHYLENE GLYCOL STEARATE or lauryl alcohol ethoxylate.
Discussion
46.

Which among the following statements is INCORRECT ?

Answer»

The atomic radius of a halogen atom is the smallest in its period.
Halogens liberate MINIMUM heat by GAIN of electronsas COMPARED to the elements in the CORRESPONDING periods.
All halogens are coloured
Density of halogens increases on movingdown the group.

Answer :B
Discussion
47.

When HCOONa is heated to 390^@ C, it gives :

Answer»

HCHO
NaOH + CO
Sodium oxalate
Sodium acetate

Answer :C
Discussion
48.

Tin reacts with :

Answer»

HOT CONC, HCI
Conc, `HNO_3`
`HgCl_2` on heating
All of these

Answer :D
Discussion
49.

Which is the correct IUPAC name for CH_(3)-underset(C_(2)H_(5))underset(|)"CH"-CH_(2)-Br?

Answer»

1-Bromo-2-ethylpropane
1-Bromo-2-ethyl-2-methylethane
1-Bromo-2-methylbutane
2-Methyl-1-bromobutane

Solution :`OVERSET(4)(C)H_(3) overset(3)(C)H_(2)-overset(CH_(3))overset(|)(.^(2)C)H-overset(1)(C)H_(2)-Br` 1-Bromo-2-methylbutane.
Discussion
50.

Which among the following equations represents the reduction reaction reaction taking place in lead accumulator at positive electrode, while it is being used as a source of electrical energy ?

Answer»

`PB to Pb^(2+)`
`Pb^(4+) to Pb`
`Pb^(2+) to Pb`
`Pb^(4+) to Pb^(2+)`

SOLUTION :Reaction at positive ELECTRODE is ,
`PbO_(2(s))+4H_((AQ))^(+)+SO_(4(aq))^(2-)+2e^(-) to PbSO_(4(s))+2H_(2)O_((l))`
`therefore Pb^(4+)` is converted into `Pb^(2+)`
Discussion