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.

What is the importance of Le-chatelier's principle ?

Answer»

Solution :From the factors affecting to equilibrium LIKE temperature, pressure, concentration any ONE change than the reaction proceed in which direction can be predicted.
Equilibrium constant is independent of initial concentration but in equilibrium system Le chatelier.s PRINCIPLE is useful to PREDICT the concentration of COMPONENTS in new equilibrium and equilibrium moves in which direction by change of concentration, temperature, pressure etc.
Discussion
2.

What volume of carbondioxide is obtained at STP by heating 8g of 50% pure limestone?

Answer»


ANSWER :0.896
Discussion
3.

When benzene is treated with DCl at low temperatures a compound C_(6)H_(6)DCl, is formed. On warming the reactants, C_(6)H_(6) and DCl are re-formed. However, in the presence of AlCl_(3) an isomer of C_(6)H_(6)DCl is produced, which on warming, gives mainly C_(6)H_(5)D and HCl. Explain.

Answer»

Solution :Since D is not incorporated into the BENZENE I ring in the absence of `AlCl_(3)` isomer C has no C-D `sigma` bond. Instead, the D end of DC is attracted to the `pi` cloud of benzene to form a loosely BOUND `pi` complex, indicated by an arrow in the structural formula. `pi` complexes are also called charge -transfer complexes, because the electron-rich benzene ring,t he donor molecule transfers some electron density to the electron-poor D of DCl, ACCEPTOR molecule. wit the catalyst `AlCl_(3)`, exchange of `D^(+)` for `H^(+)` occurs o WARMING. this exhange requires the formation of a C-D bond to give the `sigma` complex. with `D^(+)`. the benzene ring is reformed by losing an H rather than the D because the C-H bond is weaker than the C-D bond.
Discussion
4.

Which of the following exhibits geometrical isomerism ?

Answer»

1,2-Dibromopropene
2,3-Diemthylbut-2-ene
2,3-Dibrobut-2-ene
2-Methylbut-2-ene

Solution :Only in 1,2-dibromopropene `(CH_3CBr=CHBr)` both the CARBON atoms of the double bond have DIFFERENT SUBSTITUENTS and HENCE shows geomerical isomerism.
Discussion
5.

Which of the following conformations of meso 2,3-dibromobutane will give bromoalkene with alcoholic KOH ?

Answer»

GAUCHE form
Anti form
Partial ECLIPSED form
Fully eclipsed form

Solution :
Discussion
6.

Write formulas for the following compounds : Nickel (II) sulphate

Answer»

SOLUTION :`NiSO_(4)`
Discussion
7.

Which of the following pair functional groups represents ambident nucleophiles?

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`-SH &- OH`<BR>`-CN & - NO_2`
`-Br & -Cl`
`-O-& - CHO`

Solution :`-CN & - NO_2`
Discussion
8.

Write the energy level diagram of hydrogen molecule.

Answer»

Solution :Atomic number of hydrgen is 1=1s.

(a) ELECTRONIC configuration of hydrogen molecule is `SIGMA1S^(2)sigma^(**)1s^(@)`
(b) Bond order `=(2-0)/(2)=1`
(3) MAGNET property =DIAMAGNETIC.
Discussion
9.

What is the binding force between molecules, if a substance is a gas under ordinary conditions of temperature and pressure ?

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SOLUTION :VAN DER WAALS FORCES
Discussion
10.

Which of the following is mainly responsible for depetion of ozone layer?

Answer»

METHANE
CARBON DIOXIDE
Water
Chlorofluoro CARBONS

Answer :A
Discussion
11.

Which of the following containing the positive resonance effect ?

Answer»

`-NH_(2)`
`-OH`
`-NO_(2)`
A and B both

Answer :D
Discussion
12.

Which element among the following canot exhibit variable electrovalency?

Answer»

`""_(29)Cu`
`""_(50)SN`
`""_(25)Mn`
`""_(38)SR`

ANSWER :D
Discussion
13.

Which of the following element's outermost orbits Ist electron has magnetic quantum number m = 0 ?

Answer»

`NA`
`O`
`CL`
N

Answer :A
Discussion
14.

Which of the following is used for the seperation of ZnS and PbS during the froth floatation process ?

Answer»

KCl
KCl
`NH_(4)NO_3`
NONE of these.

Answer :(B)
Discussion
15.

Which of the followingchanges decrease the vapour pressure of water kept in a sealed vessel ?

Answer»

Decreasing the quantity of water
Adding SALT to water
Decreasing the volume of the VESSEL to ONE half
Decreasing the temperature of water

SOLUTION :Vapour pressure does not depend upon the quantity of water or size of the vessel. Itdecreases on adding salt to water or decreasing the temperature of water.
Discussion
16.

Which of the following has minimum flocculation value ?

Answer»

`PB^(2+)`
`Pb^(4+)`
`SR^(2+)`
`NA^(+)`

ANSWER :B
Discussion
17.

What is the formula of carbon suboxide ?

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CO
`CO_(2)`
`C_(3)O_(2)`
All

Solution :`C_(3)O_(2)[O=C=C=C=O]` is a CARBON subdioxide
Discussion
18.

What is Isobars?

Answer»

Solution :Atoms of different elements having the same MASS number but different ATOMIC NUMBERS are called isobars.
Discussion
19.

What is thesimilarityin 2p_(x ),2p_(y) and2p_(z) ?

Answer»

SOLUTION :n=2,L =1IS same
Allthreehave samedumbbellshape.
Theirshape sizeand ENERGYIS same.
Discussion
20.

Whichare isoelectronicfrom thefollowing

Answer»

<P>`Cr^(+3), AR`
`SI^(+4),P^(+3)`
`Mg^(2+),Na`
`Ar,CI`

Answer :D
Discussion
21.

Write the general electronic configuration of S-block elements.

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SOLUTION :[Noble gas] `NS^(1 "to" 2)`
Discussion
22.

Write the IUPAC name of

Answer»


ANSWER :4 methyl-pent -2-ene
Discussion
23.

Under the same conditions the rates of diffusion of two gases are in the ratio 1:4. The ratio of their vapour densities is

Answer»

`2:1`
`1:2`
`16:1`
`1:16`

SOLUTION :`(gamma_1)/(gamma_2) = 1/4 SQRT((VD_2)/(VD_1)) IMPLIES (VD_2)/(VD_1) = 1/16`.
Discussion
24.

Which of the following is most stable ?

Answer»

`SN^(2+)`
`GE^(2+)`
`Si^(2+)`
`PB^(2+)`

ANSWER :D
Discussion
25.

The standard enthalpiesof formation ofCO_(2)(g), H_(2)O(l)and glucose (s)at 25^(@)C are-400 kJ //mol, - 300 kJ//mol and-1300kJ//molrespectively.The standard enthalpy of combustion per gram of glucose at25^(@)C is

Answer»

` + 2900kJ`
` -2900kJ`
` - 16.11kJ `
`+16.11 kJ`

Solution :`C_(6)H_(12)O_(6)(s)+ 6O_(2)(g)rarr6 CO_(2)(g) +6 H_(2)O(l)`
`Delta_(r)H^(@)=Delta_(c) H^(@) = [ 6 Delta_(F)(CO_(2)) + 6 Delta_(f)H^(@) ( H_(2)O)]- [ Delta_(f) H^(@) ( C_(6)H_(12)O_(6)) + 6 Delta_(f) H^(@) ( O_(2))]`
`= 6 xx ( - 400) + 6 ( - 300) -( - 1300)`
`= -2900 kJ`
`= - ( 2900)/( 180 ) kJ //g =- 16.11 kJ //g`
Discussion
26.

Which of the following cannot be used in the following raction as L ? B_(2)H_(6)+2Lto[BH_(3).L]

Answer»

`PF_(3)`
`NH_(3)`
`CO`
`(CH_(3))_(3)N`

ANSWER :2
Discussion
27.

Which one of the following pairs is not correctly matched

Answer»

Rutherford-Proton
J.J. Thomson-Electron
J.H. Chadwick-Neutron
Bohr-Isotope

Answer :A
Discussion
28.

Which of theconfigurationof mostelectronegative elements is

Answer»

`[He] 2S^(1)`
`[He] 2s^(2)`
`[XE] 6S^(1)`
`[Xe] 6s^(2)`

SOLUTION :Theheaviestalkalimetal is the mostelectron positiveelement .
i.e.,`CS [He] 6s^(1)`
Discussion
29.

Which of the following statements is true for the reaction given below ?

Answer»

P is a meso COMPOUND of 2,3-butanediol FORMED by syn addition.
P is a meso compound of 2,3-butanediol formed by anti addition.
P is a racemic MIXTURE of d-and I-2,3-butanediol formed by anti addition.
P is a racemic mixture of d-and I-2,3-butanediol formed by syn addition.

Answer :A
Discussion
30.

Which of the following reacts with metal by displacing the hydrogen atom?

Answer»

`CH_4`
`C_2H_6`
`C_2H_4`
`C_2H_2`

ANSWER :D
Discussion
31.

To a 25 ml H_(2)O_(2) solution, excess of acidified solution of potassium iodide was added. The iodine liberated required 20 ml of 0.3 N sodium thiosulphate solution. The volume strength of H_(2)O_(2) solution is

Answer»

`1.344`
`0.672`
`2.688`
`0.896`

SOLUTION :Eq `H_(2)O_(2)` = Eq `I_(2)` = Eq `NA_(2)S_(2)O_(3)`
`(25)/(1000)XXN=(20xx0.3)/(1000)`
`N=(1.2)/(5)=0.24N=1.344V`
Discussion
32.

Which is the correct product formed from the bromination of nitrobenzene?

Answer»




SOLUTION :ELECTRON WITHDRAWING GROUPS like `NO_2` direct groups to POSITION 3
Discussion
33.

Which of the following compound is not chiral ?

Answer»

1-chloropentane
3-chloro-2-methylpentane
1-chloro-2-methylpentane
2-chloropentane

Solution :1-chloropentane
Discussion
34.

The velocityassociatedwith aprotonmovingin apotentialdifferenceof 100 v is4.37 xx 10^(5) ms^(-1).ifthe hockeyballof mass0.1kg ismovingwith thisvelocity, calculatethewavelengthassociatedwiththisvelocity

Answer»

Solution :`h= 6.626 XX 10^(34)J s=6.625 xx 10^(34)kg m^(2)s^(-10`
`v=4.37 xx 10^(5) ms^(-1)m=-0.1 kg`
Accordingto DEBROGLIE
`lambda= (h)/(mv)= (6.626 xx 10^(34) kg m^(2) s^(1))/(0.1kg 4.37 xx 10^(5) ms^(1))`
`=1.516xx 10^(38)m`
`=1.516 xx 10^(26) pm`
Note, thiswavelengthis least.Sothe BALL with high speeddoes not posseswavenature.
Discussion
35.

Which one of the following has no stereogenic center?

Answer»




SOLUTION :
Discussion
36.

The total number of isomers of C_(4)H_(10)O will be

Answer»

4
5
6
7

Solution :(i) `UNDERSET(("Butanol-1"))underset("n-BUTYL alcohol")(CH_(3)CH_(2)CH_(2)CH_(2)OH)`
(ii) `underset(("Butanol-2"))underset("SECONDARY butyl alcohol")(CH_(3)CH_(2)OVERSET(OH)overset(|)(CH)CH_(3))`
(iii) `underset("2-Methyl propanol")underset("Iso butyl alcohol")(CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)OH)`
(iv) `underset(("2-MEthyl propanol-2"))underset("Tertiary butyl alcohol")(CH_(3)underset(CH_(3))underset(|)overset(CH_(3))overset(|)(CH)OH)`
Discussion
37.

Which of the following can produce hydrogen from water ?

Answer»

Heated stannic oxide
Heated iron
Heated aluminium oxide
Heated copper oxide

Solution :Generally heated oxides do not react with `H_(2)O` to EVOLVE `H_(2)` GAS. Only iron REACTS.
`3Fe+4H_(2)O ("hot")toFe_(3)O_(4)+4H_(2)`
Discussion
38.

Why are liquids and gases categorised as fluids ?

Answer»


ANSWER :liquids and gases are CALLED fluids because they have the propetry to FLOW i.e, their molecules can move pass over one another FREELY.
Discussion
39.

Which of the following alkanes give only one mono-chloro derivative

Answer»

2, 3-dimethylbutane
Cyclohexane
2, 2-dimethylpropane
Ethane

Solution :`CH_(3)-UNDERSET(CH_(3))underset(|)OVERSET(CH_(3))overset(|)C-CH_(3)`
give only one MONO chloro Derivative.
Discussion
40.

What are all the advantages of Kjeldahl's method?

Answer»

SOLUTION :Kjeldahl.s METHOD: thismethodis carriedmuchmoreeasilythan theDumsmethodIt isusedlargelyin theanalysisoffoods andfertilizers .
Discussion
41.

The similarity between lithium and magnesium is observed due to...

Answer»

Size
Radius ratio
Electricity
All of above

Answer :D
Discussion
42.

which of thefollowingrepresentsberyllateion?

Answer»

`[Be (OH)_(4) ]^(3-)`
`[Be (OH)_(4) ]^(2-)`
`[Be(OH)_(2)]^(2-)`
`[Be (OH)]^(2-)`

ANSWER :B
Discussion
43.

Which range includes the value of the equilibrium constant, K_(eq), for a system with DeltaG^(circ) lt 0 ?

Answer»

`-1 LT K_(EQ) lt 0`
`0 lt K_(eq) lt 1`
`K_(eq) lt -1`
`1 lt K_(eq)`

ANSWER :D
Discussion
44.

Which of the following sets contain only isoelectionic ions?

Answer»

<P>`Zn^(2+),Ca^(2+),Ga^(3+),Al^(3+)`
`K^(+),Ca^(2+),Sc^(3+),Cl^(-)`
`P^(3-),S^(2-),Cl^(-),Al^(3+)`
`Ti^(4+),AR,Cr^(3+),V^(5+)`

Answer :b
Discussion
45.

Which of the following is not correct?

Answer»

Anhydrous `AICI_(3)` exists as `Al_(2)Cl_(6)`
MONOMERIC trihalide `(AICI_(3))` is Lewis acid 
Anhydrous `AlCl_(3)` fumes in air 
`TlI_(3)` is highly STABLE 

ANSWER :D
Discussion
46.

What is the limitation of framework model?

Answer»

Solution :In framework model. (i) It is not indicate the ATOM (II) This model is not give information about ATOMIC SIZE. (III) This model emphasizes the pattern of bonds of a molecule
Discussion
47.

What is the correct from the following for the reaction H_(2) O_((l)) hArr H_(2) O_((g)) at 100^(@) C and 1 atm. Pressure ?

Answer»

`DELTA E =0`
`Delta H =0`
`Delta H = Delta E`
`Delta H = T Delta S`

Solution :At EQUILIBRIUM `Delta G=0`, therefore `0= Delta H- T Delta S therefore Delta H = T Delta S`
Discussion
48.

To neutralize compltely 20 ml of 0.1 M aqueous solution of phosphorus acid, the volume of 0.1 molal aqueous KOH solution required is

Answer»

10 ml
60 ml
40 ml
20 ml

Solution :EQ of `H_(3)PO_(3)` = Eq of KOH
`2xx0.1xx20=1xx0.1xxV_(2)impliesV_(2)=40ml`
Discussion
49.

What is functional group isomerism? Explain by suitable example

Answer»

Solution :Two or more COMPOUNDS having the same molecular formula but different functional groups are called functional isomers and this phenomenon is termed as functional group ISOMERISM
Expample: The molecular formula `C_(3)H_(6)O` represents an aldehyde and a KETONE.
`CH_(3)- CH_(2) - overset(overset(H)(|))(C )=O and underset("Propanal (Propionaldehyde)")(CH_(3)CH_(2)CHO) and `underset("Propanone (Acetone)")(CH_(3)- underset(underset(O)(||))(C )-CH_(3))`
Discussion
50.

What is a vapour pressure of liquid ? What is relative lowering of vapour pressure ?

Answer»

<P>

Solution :(i) The pressure of the vapour in equilibrium with its liquid is called vapour pressure of the liquid at the GIVEN temperature.
(II) The relative lowering of vapour pressure is defined as the RATIO of lowering of vapour pressure to vapour pressure of pure SOLVENT.
Relative lowering of vapour pressure `=(P _("solvent")-P _("solution"))/(P _("solvent"))`
Discussion