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.

In fire extinguisher, pyrene is

Answer»

`CO_(2)`
`C Cl_(4)` is non-inflammable
`CS_(2)`
`CHCl_(3)`

Solution :`C Cl_(4)` is STABLE to red HEAT. Its vapours are highly non-inflammable i.e., do not catch fire. It is because of this property a fire extinguisher is RESTRICTED because with water vapours, it forms highly poisonous phosgene gas.
`C Cl_(4)+H_(2)O to underset("Phosgene")(COCl_(2))+2HCl`
Discussion
2.

In finklestein reaction alkyl chloride is converted in to

Answer»

R-F
R-I
R-Br
R-OH

Answer :B
Discussion
3.

In fibrous proteins, polypeptide chains are held together by …………………

Answer»

VAN dar Waal's FORCES
Disulphide linkage
Electrostatic forces of attraction
Hydrogen bonds

SOLUTION :(B) and (D)
The polypeptide chains in FIBROUS proteins are held by disulphide linkages and H-bonds.
Discussion
4.

In fibrous proteins, polypeptide chains are held together by........ .

Answer»

a.van der Waals FORCES
b.electrostatic forces of attraction
c.hydrogen bonds
d.covalent bonds.

Solution :Polypeptide CHAINS in FIBROUS proteins are HELD TOGETHER by disulphide and hydrogen bonds.
Discussion
5.

In ferrocene, hybridisation state of iron is

Answer»

`SP^(3)d^(2)`
`d^(2)sp^(3)`
`DSP^(3)`
`sp^(3)d^(3)`

SOLUTION :`d^(2)sp^(3)`
Discussion
6.

In fibreous proteins polypeptide chains are held together by ........

Answer»

van der WAALS FORCES
disulphide linkage
ELECTROSTATIC forces of attaraction
HYDROGEN bonds

SOLUTION :Disulphide linkages and H-bonds.
Discussion
7.

In [Fe(H_(2)O)_(6)]^(3+), [Fe(CN)_(6)]^(3-), [Fe(Cl)_(6)]^(3-) species, the hybridisation states of the Fe atoms are, respectively

Answer»

`d^(2)SP^(3), d^(2)sp^(3), sp^(3)d^(2)`
`sp^(3)d^(2),d^(2)sp^(3),d^(2)sp^(3)`
`sp^(3)d^(2),d^(2)sp^(3),sp^(3)d^(2)`
NONE of these

Solution :FE ATOM `(3d^(6)4s^(2))`
Discussion
8.

In fermentation by zymase , alcohol and CO_(2) are obtained from the following sugar

Answer»

Glucose
Invert sugar
Fructose
All of these

Solution :`underset("Glucose")(C_(6)H_(12)O_(6))overset("ZYMASE")to underset("ETHYLALCOHOL")(2C_(2)H_(5)OH)+2CO_(2)`
Discussion
9.

In fermentation by zymase, alcohol and CO_2 are obtained from :

Answer»

Glucose
Invert sugar
Fructose
All

Answer :A
Discussion
10.

In [Fe(edta)]^(-) number of 5 membered rings is

Answer»


SOLUTION :`x=5`
Discussion
11.

In Fe(CO)_5," the " Fe larr CO a bond results by the overlap between filled sp hybrid orbital of C - atomof CO molecule and vavant :

Answer»

`d^2 sp^3`
`sp^3`
`dsp^3`
`dsp^2`

ANSWER :C
Discussion
12.

In Fe(CO)_(5), the Fe-C bond possesses

Answer»

ionic character
`sigma`-character only
`pi`-character
both `sigma and pi` character

Solution :Due to some BACKBONDING by SIDEWISE overlapping between d-orbitals of METAL and p-orbital of carbon, the Fe-C BOND has 0 and `pi` character.
Discussion
13.

In Fe(CO)_(5), the F-C bond possesses :

Answer»

`PI-CHARACTER` only
both `SIGMA" and "pi` characters
ionic character only
`sigma -character` only

Answer :B
Discussion
14.

In Fe(CO)_5 , Fe-C bond possess

Answer»

SIGMA character only
Pi character only
both sigma and pi character
IONIC character

ANSWER :C
Discussion
15.

In Fe_3O_4 [Fe^(II) Fe_2^(III) O_4] O^(2-). Ions are arranged on ccp arrangement. If Fe^(2+)ions are arranged on tetrahedral voids and Fe^(3+) ions are arranged on octahedral voids, then how much portion of tetrahedral and octahedral voids occupied respectively?

Answer»

`1/4, 1/8`
`1/4 , 1/2`
`1/8, 1/2`
`1/2, 1/4`

ANSWER :C
Discussion
16.

In Fe(CO) is Cr(CO)_(6), how many CO ligands can be replaced by NO?

Answer»

3,3
3,6
6,3
2,4

Answer :D
Discussion
17.

In F.C.C the unit cell is shared equally by how many unit cells ?

Answer»

10
8
6
2

Answer :C
Discussion
18.

In FCC crystal, which of the following shaded planes contains the following type of arrangement of atoms

Answer»




SOLUTION :The SHADED PORTIONIS 111 PLANE
Discussion
19.

In faintly alkaline solution, 4 moles of permanganate anion quantitatively oxidize thiosulphate anions to produce X moles of sulphate anion. The value of X

Answer»

8
6
4
3

Answer :D
Discussion
20.

In Faraday-Tyndall effect the colloidally suspended particles

Answer»

TRACE out the PATH of STRONG BEAM of light
Undergo coagulation
Show electrophoresis
Show brownian movement

Answer :A
Discussion
21.

In face centred cubic unit cell, what is the volume occupied?

Answer»

`4/3pir^3`
`8/3pir^3`
`16/3pir^3`
`(64r^3)/(3sqrt3)`

Solution :The volume occupied by the face CENTRED cubic unit cell is `pi/3pir^3`
Packing fraction or volume occupied brgt `Z_(ett) XX volume of C- atom = `Z_(eff)xx(4/3pir^3)/a^3`
For FCC, `Z_(eff)=4=(4xx4/3pir^3)/a^3`(where,a=1)
Discussion
22.

In face centred cubic unit cell edge length is

Answer»

`(4)/sqrt(3)R`
`(4)/sqrt(2)r`
`2R`
`sqrt(3)/(2)r`

SOLUTION :In FCC
`4r=sqrt(2)arArra=(4r)/sqrt(2)`
Discussion
23.

In F.C.C. the unit cell is shared equally by how many unit cells ?

Answer»

6
4
2
8

Solution :Each unit cell is SURROUNDED by 6 other unit CELLS, SINCE a unit cell has 6 faces.
Discussion
24.

In face centred cubic (fcc) crystal lattice edge length of the unit cell is 400 pm. Find the diameter fo the greatest sphere which can be fitted into the interstitial void without the distortion of lattice.

Answer»

Solution :In fcc unit CELL : `4 R = SQRT(2)a`
`therefore r=(a sqrt(2))/(4)=(400xxsqrt(2))/(4)=141.4p m`
For octahedral void,`2(r + r^(1))=a`
`therefore 2R^(1)=a - 2r`
`= 400-2xx145`
= 117.16 PM
Hence diameter of greatest share = 117.6 pm.
Discussion
25.

Inextractionof metal how many of thefollowingorescalcination process is involved .(i) Dolomite(ii) Malachite (iii) Calcite(iv) Copper pyrities (v) Sylcine(vi) Cryolite (vii) Siderite(viii) Iron pyrite(ix) Ar gentite

Answer»


ANSWER :4
Discussion
26.

In extraction of iron, the reaction taking place in the blast furnace at around 2000 K is ,________.

Answer»

`CaO+SiO_(2) to CaSiO_(3)`
`Fe_(2)O_(3)+3C to 2Fe+3CO`
`CaCO_(3) to CaO+CO_(2)`
`2C+O_(2) to 2CO`

ANSWER :D
Discussion
27.

In extracting out the given solute by a given volume of an extracting liquid , the extraction is more complete if

Answer»

LESS number of installment of EXTRACTING liquid are used in larger volume taken in each installments.
Large numbers of installments of extracting liquid are used in SMALL volumes taken in each installment
Whole extracting liquid is used in ONE operation
Any of the above.

Answer :B
Discussion
28.

In extraction of gold, zinc actsas

Answer»

FLUX
OXIDISINGAGENT
reudcingagent
NONE.

ANSWER :C
Discussion
29.

In extraction of copper, we use _________

Answer»

COPPER glance
Malachite
silver argentocyanide
copper pyrites

Answer :D
Discussion
30.

In extraction of iron, limestone is used for

Answer»

Formation of slag
REDUCTION of FE ore
PURIFICATION of Fe FORMED
Oxidation of Fe ore

Solution :Limestone acts as FLUX
Discussion
31.

In exothermic reaction

Answer»

`TRIANGLEE` is ZERO`
`triangleH` is -ve
`TRIANGLES` is zero`
`triangleH` is +ve`

ANSWER :B
Discussion
32.

In exoergic reaction, the total mass of products is ……………………….. than the total mass of reactants.

Answer»


ANSWER :LESS
Discussion
33.

In ethylene angle CCH is:

Answer»

`180^@`
`120^@`
`109^@`
`90^@`

ANSWER :B
Discussion
34.

In ethers, the C - O - C bond angle is

Answer»

`180^(@)`
`90^(@)`
`110^(@)`
`160^(@)`

Answer :C
Discussion
35.

In ether the active group is :

Answer»

OXYGEN
`C_2H_5`
Hydroxyl
None

Answer :D
Discussion
36.

In Etard reaction, conversion of toluene to benzaldehyde is brought about by using ________ as an oxidising agent.

Answer»

alk. `KMnO_(4)`
`KMnO_(4)//H^(+)`
`K_(2)Cr_(2)O_(7)//H^(+)`
`CrO_(2)Cl_(2)`

Answer :D
Discussion
37.

In estrification, concentrated H_(2)SO_(4) acts as:

Answer»

CATALYST
DEHYDRATING AGENT
hydrolysing agent
both as a catalyst and dehydrating agent

Answer :D
Discussion
38.

In estimation of carbonand hydrogen ,the saphnolite resin absorbs :

Answer»

`N_2`
`H_2O_2`
`CO_2`
`CO_2` and `H_2O_2`

ANSWER :C
Discussion
39.

In esterification the reactivity of alcohols is :

Answer»

`3^@gt2^@GT1^@`
`1^@gt2^@GT3^@`
Same in all CASES
None

Answer :B
Discussion
40.

In esterification reaction, the role of conc. H_(2)SO_(4) is

Answer»

To ACT as DEHYDRATING agent
To act as HYDROLYTIC agent
To act as CATALYST
To act as catalyst as WELL as dehydrating agent

Answer :D
Discussion
41.

In esterification reaction the correct order of reactivity of alcohol is ,

Answer»

`1^(0) gt 2^(0) gt 3^(0)`
`3^(0) gt 2^(0) gt 1^(0)`
`1^(0) gt 3^(0) gt ^(0)`
`3^(0) gt 1^(0) gt 2^(0)`

ANSWER :A
Discussion
42.

In esterification , the reactivity of alcohols is

Answer»

`1^(@) GT 2^(@) gt 3^(@)`
`3^(@) gt 2^(@) gt 1^(@)`
Same in all cases
None of these

Answer :A
Discussion
43.

In esterification reaction concentrated H_(2)SO_(4) act as

Answer»

DEHYDRATING AGENT
catalyst
REDUCING agent
OXIDISING agent

ANSWER :A
Discussion
44.

In esterification, OH^(-) ion for making H_(2)O comes from

Answer»

Acids
Alcohols
Ketone
Carbohyrate

Answer :A
Discussion
45.

In esterification, OH^(-) Ion for making comes from

Answer»

ACID
alcohol
ketone
CARBOHYDRATE

Solution :preliminary dehydration of CARBOXYLIC in `H_(2)SO_(4)` yields water. So the -OH group in esterification reaction comes from the carboxylic acid.
Discussion
46.

In esterification of an acid, the other reagent is

Answer»

ALCOHOL
An aldehyde
Amine
WATER

ANSWER :A
Discussion
47.

In esterification of an acid, the other reagent is :

Answer»

ALDEHYDE
Alcohol
Amine
Water

Answer :B
Discussion
48.

,In equlibrium CH_(3)COOH+H_(2)OhArrCH_(3)COO+H_(2)^(+)O The equlibrium constnt may change when

Answer»

`CH_(3)COO^(-)` are added
`CH_(3)COOH` is added
CATALYST is added
Mixture is HEATED

Solution :Equlibrium constant depends UPON temperature.
Discussion
49.

In esterification , concentrated H_(2) SO_(4) acts as

Answer»

CATALYST
DEHYDRATING AGENT
hydrolysing agent
both as a catalyst and dehydrating agent

ANSWER :D
Discussion
50.

In equation XeF_(6)+3H_(2)O rarr, Xe containing product is ………. .

Answer»

`XeOF_(3)`
`XeOF_(4)`
`XeO_(2)F_(2)`
`XeO_(3)`

ANSWER :D
Discussion