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 which of the following least stable compound is :

Answer»




SOLUTION : this SPECIES is less stable. Because this compound is Anti - Aromatic and stability ORDER Aromatic `gt` Non - Aromatic `gt` Anti - Aromatic,
Discussion
2.

In voltaic cells, the electrons lost during the oxidation flow from

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CATHODE to anode
anode to cathode
remains as it is in the ELECTROLYTIC SOLUTION
electrons flowfrom electrolytic solution to electrodes

Answer :B
Discussion
3.

In Villages, people often wash their clothes with well water. They have to rub a lot of soap before lather is formed. This is because well water is hard water. Thus, a lot of soap is wasted. However, if they use detergent powder in place of soap, lather is formed easily and wastage is less. Now, answer the following questions : (i) What values are expressed in the above paragraph? (ii) Why soap does not form lather with hard water?

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Solution :(i) The values expressed in the above paragraph are that wherever WATER is hard, we should use detergent powder in place of SOAP for washing of clothes.
(ii) Hard water contains `Ca^(2+)` ions and `Mg^(2+)`ions. Soaps are sodium salts of highers fatty acids, i.e., have the formula RCOONa. Soap first REACTS with `Ca^(2+)` and `Mg^(2+)` ion till they are removed from water
`2 RCOONa + Ca^(2+) rarr (RCOO)_(2)Ca + 2 Na^(+)`
`2 RCOONa + Mg^(2+) rarr (RCOO)_(2)Mg + 2 Na^(+)`
Now, the water BECOMES soft and
Discussion
4.

In vinyl alcohol -OH group is attached to

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SP - hybridised CARBON ATOM
`sp^2` - hybridised carbon atom
`sp^3` - hybridised carbon atom
`sp^2`-d-hybridised carbon atom

ANSWER :B
Discussion
5.

In view of the signs of Delta_(r)G^(@) for the following reactions: PbO_(2)+Pb to 2PbO,Delta_(r)G^(@) SnO_(2)+S to 2SnO, Delta_(r)G^(@) Which oxidation states are more characteristics for lead and tin?

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For LEAD +2, For tin +2
For lead +4, for tin +4
For lead +2, For tin +4
For lead +4, For tin +2

Solution :Negative `Delta_(r)G^(@)` value of indicates that +2 oxidation state is more stable for Pb. Also it is supported by inert pair effect that +2 oxidation state is more stable for Pb and as `Delta_(r)G^(@)` value is POSITIVE in second REACTION it indicates that +4 oxidation state is more stable for Sn i.e., `Sn^(2+)ltPb^(2+), S^(4+)gtPb^(4+)`
Discussion
6.

In which of the following Lanthanoids oxidation state +2 is most stable ?

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Ce
Eu
Tb
Dy

Answer :B
Discussion
7.

In which of the following is bleaching powder not used:

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For BLEACHING PAPER pulp
For WATER sterilisation
For MAKING chloroform
For SUGAR decolourisation

Answer :D
Discussion
8.

In which of the following ions , the colouris not due to d-d transition ?

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`Ti(H_(2)O)_(6)^(3+)`
`CoF_(6)^(3+)`
`CrO_(4)^(2-)`
`[Cu(NH_(3))_(4)]^(2+)`

Solution :In `CrO_(4)^(2-)`, Cr is in `+6` oxidationstate.It has `d^(0)` configuration .The coloure is DUETO charge transferand not DUE to d-d transition
Discussion
9.

In which of the following ions does the metal have an oxidation state +3 ?

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`VO^(2+)`
`AlO_(2)^(-)`
`[Fe(CN)_(6)]^(2-)`
`[CrCl_(2)(H_(2)O)_(4)]^(2+)`

Solution :N/A
Discussion
10.

In which of the following ions, d-d transition is not possible

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`Ti ^(4+)`
`Cr ^(3+)`
`Mn ^(2+)`
`Cu^(2+)`

Solution :Due to absence of d-electron in `Ti^(4+)([Ar], 3D^(0)4s^(0)), d-d transition is not POSSIBLE.
Discussion
11.

In view of the signs of Delta_(r)G^(@)for the following reactions : PbO_(2) + Pb to 2 Pb O , Delta_(r) G^(@) lt 0 SnO_(2) + Sn to 2 SnO , Delta _(r) G^(@) gt 0 , which oxidation states are more characteristic for lead and tin ?

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For LEAD + 2, for tin + 2
For lead + 4, for tin+ 4
For lead+ 2, for tin + 4
For lead+ 4, for tin + 2

Answer :C
Discussion
12.

In which of the following ionization processes, the bond order has increased and the magnetic character has changed ?

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`NO to NO^(+)`
`O_(2)to O_(2)^(+)`
`N_(2)to N_(2)^(+)`
`C_(2)to C_(2)^(+)`

Solution :(A) NO (B.O. = 2.5, PARAMAGNETIC)
`RARR NO^(+)`(B.O. = 3, diamagnetic)
(B) `O_(2)` (B.O. = 2, paramagnetic)
`rarr O_(2)^(+)` (B.O. = 2.5, paramagnetic)
(C ) `N_(2)`(B.O. = 3, diamagnetic)
`rarr N_(2)^(+)`(B.O. = 2.5, paramagnetic)
(D)`C_(2)`(B.O. = 2, diamagnetic)
`rarr C_(2)^(+)`(B.O. = 1.5,paramagnetic)
Correct ANSWER is (A).
Discussion
13.

In which of the following ionic radii of chromium would be smallest

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`K_(2)CrO_(4)`
`CrO_(2)`
`CrCl_(3)`
`CrF_(2)`

Solution :Oxidation number of Cr in OPTIONS a, b, c and d are `+6,+4, +3, +3` RESPECTIVELY.
In given options (a) has high oxidation number therefore its radii with be low. Atomic radii decreases with increase in oxidation no.
Discussion
14.

In viewof thesigns ofDelta _r G^(@)forthefollowingreactions:PbO_2+Pb to2 PbO, Delta_ rG^(@) lt0SnO_ 2+Snto2 SnO,Delta_ r G^(@) gt0 whichoxidation states are morecharacteristicforleadandtin ?

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Forlead` +4`, fortin + 2
Forlead+2, for tin+ 2
Forlead+4, fortin+4
Forlead +2, for in+4

Solution :Since`DELTA _rG^(@) `is- veforfirstreaction,THEREFORE, +2oxidationstate of Pb is morestable. Further since` Delta _r G^(@) ` is+ ve for SECONDREACTION,therefore,+4oxidationstateof SN is morestable. Thus, option (d) iscorrect.
Discussion
15.

In which of the following ion/molecules, the 'S' atom does not assume sp^(3) hybridization ?

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`SO_(4)^(2-)`
`SF_(4)`
`SF_(2)`
`S_(8)`

ANSWER :A
Discussion
16.

In view of the signs of DeltaG^(ө) for the following reactions, PbO_(2)+Pb to 2PbO,Delta_(r)G^(ө) lt 0, SnO_(2)+Snto 2SnO,Delta_(r)G^(ө) gt 0 Which oxidation states are more characteristic for lead and tin?

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For lead +4, for TIN +2
For lead +2, ffor tin +2
For lead +4, for tin +4
For lead +2, for tin +4

Solution :`overset(+4)(Pb)O_(2)+overset(0)(Pb) to 2 overset(+2)(Pb)O`
Since, `Delta_(r)G^(@) lt 0`, HENCE +2 state of lead is favourable.
`overset(+4)+(SN)O_(2)+overset(0)(Sn) to 2 overset(0)(Sn)O`
Since, `Delta_(r)G^(@)gt0` it means forward reaction is not spontaneous.
`2overset(+2)(Sn)O+overset(+4)(Sn)O_(2) to 2overset(0)(S)n`
`Delta_(r)G^(@) lt0`, thus +4 state of tin is favourable.
Discussion
17.

In which of the following ion the value of magentic moment (spin only) is sqrt(3) BM and outer d-orbitals is used in hybridization.

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`[Mn(CN)_(6)]^(4-)`
`[FE(NH_(3))_(6)]^(3+)`
`[Co(CO)_(4)]`
`[CU(H_(2)O)_(6)]^(2+)`

Answer :D
Discussion
18.

In view of the signs of Delta_rG^@for the following reactions : PbO_2 +Pb rarr 2PbO,Delta_rG^@ lt 0 SnO_2 +Sn rarr 2SnO, Delta_rG^@ gt 0 Which oxidation states are more characteristic for lead and tin ?

Answer»

For lead +2 for TIN +2
For lead +4, for tin +4
For lead +2, for tin +4
For lead +4 ,for tin +2

Solution :`DeltaG^@ lt 0` so that `Pb^(4+) rarr Pb^(2+)`
or `Pb^(2+) ` is more stable than `Pb^(4+)`
`DeltaG^@ GT 0` i.e., nonspontaneous
so that `SN^(4+)` is more stable than `Sn^(2+)`.
Discussion
19.

In which of the following, intermolecular H-bond is not present ?

Answer»

Alcohol-Alcohol
Phenol-Phenol
Ether-Ether
Ether-Water

Solution :Ether-Ether
Discussion
20.

In view of the sign of DeltaG^@ for the following reactions PbO_2 + Pb to 2PbO, DeltaG^(@) < 0 SnO_2 + Sn to 2SnO, DeltaG^@ > 0 Which oxidation states are more characteristic for lead and tin ?

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For lead + 2, for TIN + 2 
For lead + 4, for tin + 4 
For lead + 2, for tin + 4 
For lead + 4, for tin + 2 

ANSWER :B
Discussion
21.

In which of the following ion d-d transition is not possible?

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`Mn^(2+)`
`Cu^(2+)`
`Ti^(4+)`
`CR^(3+)`

ANSWER :C
Discussion
22.

In which of the following interhalogen compounds the central atom is sp^3d hybridised:

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`ClF_3`
`BrF_3`
BOTH (A) AND(B)
None

Answer :C
Discussion
23.

In Victor Meyer's test no colouration will be observed in case of …………………….. .

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SOLUTION :TERTIARY ALCOHOL
Discussion
24.

In Victor Mayer's method0.2 gmof an organicsubstance displaced 56 ml of air at STP the molecular weight of the compound

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56
112
80
28

Solution :Molecular mass
`= (" WT. of organic substance TAKEN")/(" air displaced at STP") xx 22400`
`= (0.2)/(56) xx 224000 = 80`.
Discussion
25.

In which of the following interconversion of electrical energy into chemical energy and vice versa take place ?

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ELECTROCHEMICAL CELL
ELECTRIC cell
Dynamo
AC generator

Answer :A
Discussion
26.

In very dilute solution the no. of moles of solvent are 10 time more than that of the solute. The V.P. of the solution would be (V.P. of pure solvent = 80mm)

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80mm
88mm
72mm
92mm

SOLUTION :As the solution is very dilute, addcording to RAOULT's law.
`(P_(1)^(0)-P)/P_(1)^(0)=n/N or 1-P/P_(1)^(0)=n/N`
`:. P=(1-n/N)P_(1)^(0)=(1-1/10)80=72mm`
Discussion
27.

In vapour state the molecular weight of CH_(3) COOH becomes doubled . It is due to

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IONIC bond
COVALENT bond
HYDROGEN bond
DATIVE bond

Answer :C
Discussion
28.

In whichof the followingimino group is present.

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SOLUTION :NH GROUPIS iminogroup.
Discussion
29.

In vapour phase refining, the metal is converted into its………….compound which is collected and decomposed to give pure metal.

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SOLUTION :VOLATILE
Discussion
30.

In vapour state, sulphur (S_2) shows paramagnetic behaviour due to

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PRESENCE of one unpaired electron in the antibonding `sigma^**`orbitals
Presence of TWO unpaired ELECTRONS in the bonding PI orbitals
Presence of one unpaired electrons in the bonding `pi^**` orbitals
Presence of two unpaired electrons in the bonding `pi^**` orbitals

Answer :D
Discussion
31.

In which of the following hybridisation state of the central atom would be changed if transformed from monomeric to dimeric or polymeric species. BeCl_(2)(g)toBeCl_(2)(s), AlCl_(3)(g)toAl_(2)Cl_(6)(l) BeH_(2)(g)toBeH_(2)(s), ICl_(3)(g)toI_(2)Cl_(6)

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`SP^(2)` to `sp^(3)`
sp to `sp^(3)`
`sp^(3)d` to `sp^(3)d^(2)`
All of the above

Solution :`N//A`
Discussion
32.

In which of the following, homolytic bond fission takes place?

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FREE radical chlorination of methane
Alkaline HYDROLYSIS of ethyl chloride
Addition of HBR to double bond
Nitration of Benzene

Solution :Free radical formation TAKES place due to homolytic cleavage.
Discussion
33.

In vaporisation of liquids into air, liquid dissolved into air, hence liquid is

Answer»

solution
solute
solvent
mixture

Answer :B
Discussion
34.

In van dor waals gas equation, the term that accounts for the volume occupied by 'n' mole molecules is

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<P>(V - NB)
`FRAC{an^2}{V^2}`
nb
`P + frac{an^2}{V^2}`

ANSWER :A
Discussion
35.

In which of the following Hofmann elimination product is more

Answer»

`CH_3-undersetunderset(CH_3)|oversetoverset(CH_3)|C-undersetunderset(OH)|CH-CH_3 undersetDeltaoverset(Conc. H_2SO_4)to`
`CH_3-undersetunderset(CH_3)|oversetoverset(CH_3)|C-undersetunderset(Br)|CH-CH_3 underset"t-butoxide"overset("Potassium")to`

`CH_3-undersetunderset(CH_3)|oversetoverset(CH_3)|C-CH_2-Cl undersetDeltaoverset"alc KOH"to `

Solution :In (B) `CH_3-undersetunderset(CH_3)|CH-CH=CH_2` is FORMED (Hofmann PRODUCT)
In ( c )`CH_3-undersetunderset(CH_3)(|)CH-CH=CH_2` is formed . (Hofmann product)
In (a)`CH_3-undersetunderset(CH_3)(|)C=undersetunderset(CH_3)(|)C-CH_3` is formed . (Saytzeff's product)
In (d)`CH_3-undersetunderset(CH_3)|C=CH-CH_3` is formed . (Saytzeff's product )
Discussion
36.

In which of the following, HCl conducts electricity to a large extent ?

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LIQUID HCL
HCl AQ. SOLUTION
HCl solution in benzene
gaseous HCl

Discussion
37.

In van der Walls equation of state for a non-ideal gas the term that accounts for inter molecular forces is :

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<P>(V-b)
RT
`(P + a/V^2 )`
`(RT)^(-1)`

ANSWER :C
Discussion
38.

In which of the following, halogenated carbon possesses sp^(3) hybridization ?

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`CH_(2)=CH-Cl`

ANSWER :D
Discussion
39.

In van der Waals equation, the constant of accounts for what property of molecules of real gases ?

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1. Average KINETIC ENERGY
2. Size of molecules
3. Intermolecular attractions
4. Elastic collisions.

Answer :C
Discussion
40.

In Van Arkel method of refining metal, impure zirconium is converted to unstable volatile compound by heating it with-

Answer»

OXYGEN
CHLORINE
BROMINE
IODINE

ANSWER :D
Discussion
41.

In which of the following>C=O and>C=C

Answer»

Hydrogenation
Elimination
Oxidation
None

Answer :B
Discussion
42.

In which of the following geometry around metal is tetrahedral and colour is due to charge transfer spectra (LMCT) ?

Answer»

`MnO_(4)^(-)`
`CrO_(4)^(2-)`
`CrO_(2)Cl_(2)`
`Cr_(2)O_(7)^(2-)`

Answer :A::B::C::D
Discussion
43.

In van der Waals equation of state for a non-ideal gas , the term that accounts for intermolecular forces is

Answer»

<P>`V_(m)-B`
`P+(a)/(V_(m)^(2))`
RT
1/RT

Answer :B
Discussion
44.

In which of the following gaseous molecules, the ionic character of the covalent bond is greatest :

Answer»

HCI
HBr
HI
HF

Answer :D
Discussion
45.

In van der Waals equation for a non ideal gas, the term that account for intermolecular forces is :

Answer»

`( V - b)`
RT
`( p + ( a )/( V^(2)))`
`( RT)^(1//2)`

ANSWER :C
Discussion
46.

In which of the following four P-OH bonds are present ?

Answer»

<P>`H_(4)P_(2)O_(6)`
`H_(3)PO_(2)`
`H_(3)PO_(3)`
`H_(4)P_(2)O_(5)`

ANSWER :A
Discussion
47.

In which of the followingfirstis morebasic thansecond

Answer»




SOLUTION :Electronwithdrawing GROUPS decreases the basicityof AMINE.
Morethe electronwithdrawing POWEROF the groupless the basicity .
`-NO_(2)`grouphas moreelectronwithdrawingpowerthan F. Hence p-fluoroanilineis morebasic thep-nitro aniline .
Discussion
48.

In vulcanisation of rubber:

Answer»

Suiphur reacts to from NEW COMPOUND
SULPHUR cross-links are introduced
Sulphur forms a very THIN protective
layer over rubber
All of the statements are correct

Answer :B
Discussion
49.

In USA terylene is known as

Answer»

terene
NYLON
DACRON
cronar

ANSWER :C
Discussion
50.

In which of the following first is more acidic than second ?

Answer»




ANSWER :D
Discussion