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.

Result of 3.421-0.12 is

Answer»

3.301
3.33
3.3
3

Answer :B
Discussion
2.

Respiration involves "_________________" reaction.

Answer»

only OXIDATION
only reduction
redox
neutralization

Answer :C
Discussion
3.

Resonating structures of a molecule should have

Answer»

IDENTICAL arragmentof atoms
Nearly the same ENERGY content
The same number of PAIRED electrons
The same number of UNPAIRED electrons

Solution :(concept of resonance theory)
Discussion
4.

Resonance structures of propenat are give below. Which of these resonating structures is more stable? Give reason for your answer. underset((I))(CH_(2)=CH-CH=O)harr underset((II))(overset(oplus)(C )H_(2)-CH=CH- overset(Θ)(O))

Answer»

SOLUTION :STRUCTURE (I) is more STABLE because,
Discussion
5.

Resonance structures of propenal are given below. Which of these resonating structures is more stable ? Give reason for your answer. underset(I)(CH_(2)=CH-CH=O) harr underset(II)(overset(o+)(C)H_(2)-CH=CH-overset(Θ)(O))

Answer»

Solution :Resonance STRUCTURES of PROPENAL are shown below :

Structure II INVOLVES separation of +ve and -ve charges. Furthermore, the terminal carbon has only a sextet of electrons. Due to these two FACTORS, structure (II) is less stable than structure (I).
Discussion
6.

Resonance structures of a molecule should have

Answer»

IDENTICAL arrangement of atoms
nearly the same energy content
same NUMBER of paired electrons
identical bonding

Answer :A::B::C
Discussion
7.

Resonance structure of the molecule does not have

Answer»

higher ENERGY than their HYBRID structure.
identical ARRANGEMENT of atoms.
the same number of PAIRED electrons.
always EQUAL contribution to the resonance hybrid.

Answer :D
Discussion
8.

Resonance phenomenon is generally involved when single valence bond structure could not represent the actual structure of the molecules or species. Based on the actual bond lengths, bond energies etc, of the molecules or species, resonance phenomenon will help to achieve at the correct structure of the species or molecules. Which of the following is correct

Answer»




All the above

Answer :D
Discussion
9.

Resonance is not exhibited by

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PHENOL
ANILINE
NITROBENZENE
CYCLOHEXANE

ANSWER :D
Discussion
10.

Resonance involves :

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DELOCALIZATION of `PI`-electrons along a CONJUGATED system.
Delocalization of lone PAIR along a conjugated system.
Delocalization of negative charge along a conjugated system.
All are correct.

Answer :D
Discussion
11.

Resonance in benzene is accompanied by delocalisation of pi electrons. Each pi electron is attached with

Answer»

FOUR CARBON electrons
TWO carbon electrons
THREE carbon electrons
NONE of the above

Answer :D
Discussion
12.

Resonance energy per benzene ring is maximum for

Answer»

BENZENE
Naphthalene
PHENANTHRENE
Anthracene

Solution :For benzene, resonance energy is 151 KJ/mole, naphthalene 255, anthracene 351 and phenanthrene it is 375 KJ/mole respectively. So per benzene RING resonance energy is more for benzene
Discussion
13.

Resonance energy will be more if

Answer»

canonical strutures are equivalent than if canonical STRUCTURES are non-equivalent.
molecule is aromatic than if molecule is not aromatic.
more number of p-bonds are involved in resonance than less number of p-bonds are involved.
Resonance with 2p-2p OVERLAPPING than resonance with 3p-2p overlapping.

Solution : A) canonical structures are equivalent than if canonical structures are non-equivalent.
B) molecule is aromatic than if molecule is not aromatic.
C) more number of p-bonds are involved in resonance than less number of p-bonds are involved.
D) Resonance with 2p-2p overlapping than resonance with 3p-2p overlapping.
Discussion
14.

Resonance energyof benzene is

Answer»

canonical strutures are equivalent than if canonical STRUCTURES are non-equivalent.
MOLECULE is aromatic than if molecule is not aromatic.
more number of p-bonds are involved in resonance than less number of p-bonds are involved.
Resonance with 2p-2p OVERLAPPING than resonance with 3p-2p overlapping.

Answer :A::B::C::D
Discussion
15.

Resonance bring down the stability of molecule. State true or false.

Answer»


ANSWER :F
Discussion
16.

Represent the potential energy/enthalpy change in the following processes graphically. (a) Throwing a stone from the ground to roof. (b) (1)/(2) H_(2) (g) + (1)/(2) Cl_(2) (g) hArr HCl (g) Delta_(r) H^(Θ) = - 92.32 kJ mol^(-1) In which of the processes potential energy/enthalpy change is contributing factor to the spontaneity ?

Answer»

Solution :Representation of potential energylenthalpy change in the following PROCESSES
(a) Throwing a stone from the ground to roof.

(b) `(1)/(2) H_(2) (g) + (1)/(2) Cl_(2) (g) hArr HCl (g) , Delta_(f) H^(Θ) = - 92.32 kJ MOL^(-1)`

Energy increases in (a) and it decreases in (b) PROCESS. Hence, in process (b), enthalpy change is the contributing FACTOR to the spontaneity
Discussion
17.

Representative elements are those which belong to

Answer»

<P>s and d- blocks
s and p- blocks
p and d- blocks
d and F- blocks

Answer :B
Discussion
18.

Representation of the orbital with quantum numbers n = 3,1 = 1 is

Answer»

3s
3d
3p
1s

Answer :C
Discussion
19.

Represent the three type of electron movement in organic reaction

Answer»

SOLUTION :(i) The electron from `pi` bond to ADJACENT bond position

(ii) Electron PAIR from the `pi` bond SHIFT on that atom

(III) From the atom (Y) on its conjugated bond
Discussion
20.

Represent the potential energy // enthalpychange in the followingprocesses graphically : (a) Throwing astone from the ground to roof. (b)(1)/(2)H_(2)(g)+(1)/(2)Cl_(2)(g)hArr HCl(g) Delta_(r)H^(c-) = - 92.32kJ mol^(-1) In which of the following processpotential energy // enthalpy change is contributing factor to the spontaneity ?

Answer»

Solution :
ENERGY INCREASES in (a) and it decreases in (b). HENCE, in process (b), ENTHALPYCHANGE is the CONTRIBUTING factorto the spontaneity.
Discussion
21.

Represent the potential energy / enthalpy change in the following processes graphically. (a) Throwing a stone from the ground to roof. (b) (1)/(2) H_(2(g)) + (1)/(2) CI_(2(g)) hArr HCI_((g)) Delta_(r) H^( Theta ) - 92.32 "kJ mol"^(-1) In which of the processes potential energy/ enthalpy change is contributing factor to the spontaneity ?

Answer»

Solution :Representation of potential energy/ENTHALPY CHANGE in the following process :
(a) Throwing as stone from the ground to roof.

(B) `(1)/(2) H_(2(g)) + (1)/(2) CI_(2(g)) hArr HCI_((g)) , Delta_(R) H^( Theta ) = -92.32 "kJ mol"^(-1)`

Energy is increased in (a) and it is decreased in (b) process. Hence, in process (b), enthalpy change is the contributing factor to the spontaneity.
Discussion
22.

Represent the single electron movement of CH_(3)- Cl bond

Answer»

Solution :The movement of SINGLE electron is indicated by a single BARBED fish hookd (i.e., half headed curved arrow). The curved arrow starts fro the point from where an electron PAIR is SHIFTED and it ends at a location to which the pair of electron MAY move
Discussion
23.

Represent the inductive effect in: (a) CH_(3)COOH, (b) C Cl_(3)COOH and (c ) CH_(3)COOH

Answer»

Solution :(a) `CH_(3)COOH`
There is ELECTRON denoting INDUCTIVE effect (+I) of `-CH_(3)` group
(b) `ClCl_(3)COOH`:
There is three `-Cl` are electron attractive group so electron is AWAY from `-COOH`
There is electron attractive effect of TWO `-Cl`. So, `C-COOH` electron density is more, away from `-COOH`
Discussion
24.

Represent the following equation in ionic form K_(2)Cr_(2)O_(7)+7H_(2)SO_(4)+6FeSO_(4)=3Fe(SO_(4))_(3)+Cr_(2)(SO_(4))_(3)+7H_(2)O+K_(2)SO_(4)

Answer»

SOLUTION :In this equation except, `H_(2)O`, all ionic in NATURE. Representing these compounds in ionic forms,
`2K^(+)+Cr_(2)O_(7)^(2-)+14H^(+)+7SO_(4)^(2-)+6Fe^(2+)+6SO_(4)^(2-)to6Fe^(3+)+9SO_(4)^(2-)+2Cr^(3+)+3SO_(4)^(2-)+2K^(+)+SO_(4)^(2-)+7H_(2)O`
`2K^(+)` ions and `13SO_(4)^(2-)` ions are common on both SIDES, so these are cancelled. The desired ionic equation reduces, to
`Cr_(2)O_(7)^(2-)+14H^(+)+6Fe^(2+)=6Fe^(3+)+2Cr^(3+)+7H_(2)O`
Total charge are equal on both sides, thus, the balanced ionic equation is the same as above.
Discussion
25.

Represent the bond formation in [Fe(CN)_(6)]^(4-) and BF_(3)-NH_(3)

Answer»


Answer :In ferrocynide ION `[Fe(CN)_(6)]^(4-)` , each cyanide ion `(CN^(-))`donates a pair of ELECTRONS to form a co-ordinate BOND with IRON `(Fe^(2+))` and these electrons are shared by `Fe^(2+)` and `CN^(-)` .
In certain , molecules having a long pair of electrons such as ammonia donates its pair to an ELECTRON deficient molecules such as`BF_(3)*`to form a co-ordinate bond
`(##SUR_CHE_XI_VO2_S_MQP_02_E01_041_A01##)`
`(##SUR_CHE_XI_VO2_S_MQP_02_E01_041_A02##)`
Discussion
26.

Represent the cell corresponding to the following redox reaction and identify the anode and the cathode. Cd(s)+2Ag^(+)(aq)toCd^(2+)(aq)+2Ag(s)

Answer»

SOLUTION :`CD(s)|Cd^(2+)(AQ)||AG^(+)(aq)|Ag`
Discussion
27.

Represent the bond formation in [Fe(CN)_(6)]^(4-)" and " BF_(3) - NH_(3)

Answer»

SOLUTION :In ferrocynide ion `[Fe(CN)_(6)]^(4-)`,eachcyanide ion `(CN^(-))` donates a pair of electrons to form a co-ordinate
BOND with iron `(Fe^(2+))` and these electrons are shared STRUCTURE of Ferrocyanide ion by `Fe^(2+)` and `CN^(-)`.
In CERTAIN cases, molecules having a lone pair of electrons such as ammonia donates its pair to an electron deficient molecules such as `BF_(3)` . to form a co-ordinate bond.
Discussion
28.

Represent hyperconjugation in CH_(3) overset(+)(C )H_(2) and CH_(3)CH= CH_(2) by only figure

Answer»

SOLUTION :
Discussion
29.

Represent structure of the free radical, carbocation and carbanion from methane.

Answer»

SOLUTION :
Discussion
30.

Represent hydrogen bonding between two molecular of (i) acetic acid (CH_(3) COOH)(ii) acetamide (CH_(3) CONH_(2)).

Answer»

SOLUTION :
Discussion
31.

Represent different type of periodic properties in periodic table.

Answer»

Solution : When we go left to right in PERIOD then electron gain ENTHALPY. Ionization enthalpy and ELECTRONEGATIVITY increases.
When atomic number increases atomic RADIUS decreases in period.
In top to BOTTOM atomic radius increases in group.
In top to bottom in group electronegativity ionisation enthalpy, electron gain enthalpy decreases.
When we go left to right in periodic table nonmetallic diagonal properties increases and metallic properties decreases.
Discussion
32.

Represent diagrammatically the bond moments and the resultant dipoJe moment in CO_(2), NF_(3) and CHCl.

Answer»

SOLUTION :
Discussion
33.

Report your answer as XY

Answer»


SOLUTION :
Discussion
34.

Report the volume at STP accupied by(a) 6.022xx10^(22) H_(2)S molecules and (b) 0.25 mol of nitrogen

Answer»


ANSWER :(a)2.24L and (B) 5.6L
Discussion
35.

Report the area of a rectangle to approprite number of significant figures. Given that the edge lengths of the rectangle are 6.221 cm and 5.2 cm.

Answer»


SOLUTION :`6.221xx5.2=32.349=32.4 "CM"^(3)` (after ROUNDING off)
Discussion
36.

Report the value of gas constant in cal K^(-1) molecule

Answer»

SOLUTION :Gas CONSTANT per molecule of a gas is called Boltzmann constant (k). It is GIVEN as
` K= ( R)/(N_0) = ( 1.987)/( 6.023 xx 10^(23)) = ( 19.87 )/( 6.023 ) xx 10^(-24)`
Gasconstantpermolecule
`= 3.3 xx 10^(-24) CALK^(-1)" molecule"^(-1)`
Discussion
37.

Report the prouduct of 4.5 and1.25 in significant figures.

Answer»


ANSWER :5.6
Discussion
38.

Removal of CO_2from a -COOH group is called decarboxylation.

Answer»


ANSWER :T
Discussion
39.

Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using........

Answer»

GRIT chamber
serubbers
TRICKLING FILTERS
CATALYTIC convertors

Solution :trickling filters
Discussion
40.

Relationship between formed products is :

Answer»

ENANTIOMER
diastereomers
metamer
poditional isomers

Solution :
Discussion
41.

Relationship between different types of speeds.

Answer»

Solution :Most PROBABLE speed `(u_(mp))=sqrt((2RT)/(M))`
Average speed, `(u_(av))=sqrt((8RT)/(pi M))`
ROOT mean square speed, `(u_(RMS))=sqrt((3RT)/(M))`
RELATION between three speeds are as under.
`u_(rms)gt u_(av)gt u_(mp)`

ratio between three speeds are as under,
`{:(,u_(mp),:,u_(av),:,u_(rms)),(,1,,1.128,,1.224),("OR",0.82,,0.92,,1.00):} ""`......(EQ. -i)
`u_(rms)=sqrt((3RT)/(M))=sqrt((3pV)/(M)) = sqrt((3p)/(d)) ""`.....(Eq. -ii)
`u_(av)=0.92133xx u_(rms)`
`u_(mp)=0.816xx u_(rms)`
Discussion
42.

Relation between oxidation numbers and electronegativity is given by

Answer»

PAULING's SCALE
Alfred scale
Mulliken's scale
Slater's scale

ANSWER :B
Discussion
43.

Relation between K_(1)andK_(2) is :

Answer»

`K_(1)=K_(2)`
`K_(1) gtK_(2)`
`K_(2) gtK_(1)`
`K_(1)=K_(2)=1`

Solution :More streic REACTANT easily CONVERT into product.`1/K_(1) lt1/K_(2) "" because K_(1)gtK_(2)`
Discussion
44.

Relation between given pair is :

Answer»

enantiomer
doasterep,er
odemtoca,
strictural isomer

Solution :
Discussion
45.

Relation between 1 L = _____ dm^3

Answer»

1
100
10
1000

Answer :A
Discussion
46.

Reimer Tiemann reaction introduces an aldehyde group, on to the ring of phenol, ortho to hydroxyl group. The reaction involves electro-philic aromatic substitution. This is a general method for synthesis of substituted salicyladehyde as depicted below The structure of the intermediate is

Answer»




SOLUTION :
Discussion
47.

Reimer Tiemann reaction introduces an aldehyde group, on to the ring of phenol, ortho to hydroxyl group. The reaction involves electro-philic aromatic substitution. This is a general method for synthesis of substituted salicyladehyde as depicted below Which one of the following reagents is used in the above reactions

Answer»

aq `NAOH+CH_(3)Cl`
aq `NaOH+CH_(2)Cl_(2)`
aq `NaOH+CH_(3)Cl_(3)`
aq `NaOH+C Cl_(4)`

SOLUTION :`NaOH aq+ CHCl_(3)`
`Cl_(3)C-H UNDERSET(-H_(2)O)overset(OH^(-))rarr Cl_(3)C^(-)`
Discussion
48.

Reimer Tiemann reaction introduces an aldehyde group, on to the ring of phenol, ortho to hydroxyl group. The reaction involves electro-philic aromatic substitution. This is a general method for synthesis of substituted salicyladehyde as depicted below The electrophile in this reaction is

Answer»

`:CHCl`
`OVERSET(+)(C)HCl_(2)`
`:C Cl_(2)`
`overset(.)(C) Cl_(3)`

Solution :In REIMER Tiemann Reaction
`underset("base")(OH^(-))+CHCl_(3) underset(-H_(2)O)rarr : overset(-)(C) Cl_(3)underset(-Cl^(-))rarr underset(("ELECTROPHILE"))underset("chlorocarbene") ( :C Cl_(2))`
Discussion
49.

Regions of the atmosphere showing decrease in temperature with altitude are ___

Answer»

Troposphere
Mesosphere
STRATOSPHERE
THERMOSPHERE

Answer :A::B
Discussion
50.

Regarding the surface tension property of liquids, the correct statements is/are a) surface tension decreases with increase of temperature b) at 20^@ C the surface tension of ethanol is greater than that of water c) the dimensions of surface tension is SI units is Nm^(-1) d) in the fine polishing of the glass, the edges become smooth due to surface tension

Answer»

a and B only
a, C and d only
a and d only
b only

Answer :B
Discussion