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.

Draw the, structure of maltose.

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SOLUTION :
Discussion
2.

During the decomposition of a gas on the surface of a solid catalyst, the pressure of the gas at different times was observed to be as follows : {:(t//s,,,""0,,,""100,,,""200,,,""300),(p//Pa,,,5*00xx10^(3),,,4*20xx10^(3),,,3*40xx10^(3),,,2*60xx10^(3)):} Calculate order, rate constant and half-life period of this reaction.

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Solution :Let us FIRST calculate rates of reaction during different intervals of time
`{:("Interval",,,,"Rate of reaction"),(0-100" s",,,,-((4.20-5*00)xx10^(3)PA)/(100s)=8Pa" s"^(-1)),(100-200" s",,,,-((3*40-4*20)xx10^(3)Pa)/(100s)=8Pa" s"^(-1)),(200-300" s",,,,-((2*60-3*40)xx10^(3)Pa)/(100s)=8Pa" s"^(-1)):}`
As the rate of reaction constant THROUGHOUT, therefore, the reaction is of zero order.
Alternatively, let us test it by integrated rate equation
`{:(t(sec),,,,k=(1)/(t)[P_(0)-P]),(100,,,,k=(1)/(100s)(5*00-4*20)xx10^(3)Pa=8" Pa "s^(-1)),(200,,,,k=(1)/(200s)(5*00-3*40)xx10^(3)Pa=8" Pa "s^(-1)),(300,,,,k=(1)/(300s)(5*00-2*60)xx10^(3)Pa=8" Pa "s^(-1)):}`
As k cmes out to be constant, the reaction is of zero order.
Rate constant, `k=8" Pa "s^(-1)`
Half-life period, `t_(1//2)=([P_(0)])/(2k)=(5*00xx10^(3)Pa)/(2xx8Pa" s"^(-1))=312*5` s.
Discussion
3.

During the decomposition of H_2O_2 to given dioxygen , 48 g O_2 is formed per minute at certain point of time . The rate of formation of water at this point is .......

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`0.76 "MOL min"^(-1)`
`1.5 "mol min"^(-1)`
`2.25 "mol min"^(-1)`
`3.0 "mol min"^(-1)`

Solution :`H_2O_2rarrH_2O+1//2O_2`
RATE = `(-d[H_2O_2])/(dt)=(d[H_2O_2])/(dt)=(d[H_2O])/(dt)=(2D[O_2])/(dt)`
No. of MOLES of oxygen = `(48/32)=1.5mol`
Rate of FORMATION of oxygen `=2x1.5 `
`3 " mol min"^(-1)`
Discussion
4.

Draw the structure of isomers if any and write the names of the following complexes? i) [Cr(NH_(3))_(4)Cl_(2)]^(+) ii) [Co(en)_(3)]^(3+)

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SOLUTION :i) tetraamminechloridochromium (III) ION.
II) tris (ethane-1, 2-diamine) cobalt (III) ion.
Discussion
5.

During the decomposition of a gas on the surface of a solid catalyst, A to Products, which is a zero order reaction, the initial pressure of 200 atm of 'A' is reduced to 100 atm in 100 seconds. The rate constant of the reaction is

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1 atm `s^(-1)`
2 atm `s^(-1)`
4 atm `s^(-1)`
8 atm `s^(-1)`

Solution :`t_(1//2)= 100sec`
For ZERO reaction , `t_(1//2)= [A]_0/(2k)`
`or k =(2t_(1//2))/[A]_0=(2 XX 100s)/(200" atm")= 1atm s^(-1)`
Discussion
6.

During the cyanide leaching of gold, the insoluble gangue formed is

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GOLD cyanide
ALUMINOSILICATE
gold silicate
gold aluminosilicate

Solution :aluminosilicate
Discussion
7.

Draw the structure of monomers of each of the polymer : Nylon-6

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SOLUTION :
Discussion
8.

During the curdling of milk, what happens to sugar present in it ?

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Solution :The milk SUGAR LACTOSE is converted to lactic ACID during the CURDLING.
Discussion
9.

During the conversion: C_(6)H_(5)CH_(2)CH_(3)overset((a))rarrXoverset((b))rarrC_(6)H_(5)CH=CH_(2) the reagents (a) and (b) are respectively

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`SOCl_(2)`, alc. KOH
`Cl_(2)//HV, H_(2)O`
`SO_(2)Cl_(2)`, aq. KOH
`SO_(2)Cl_(2)`, alc. KOH

SOLUTION :`C_(6)H_(5)CH_(2)CH_(3)underset(-SO_(2),-HCl)overset(SO_(2)Cl_(2)(a))rarrC_(6)H_(5)underset(Cl)underset(|)(C)HCH_(3)underset(-HCl)overset("alc. KOH(b)")rarrC_(6)H_(5)CH=CH_(2)`
Discussion
10.

Draw the structure of major mono halo product in each of the following reactions : (i)

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SOLUTION :(i)
Discussion
11.

Draw the structure of (i) procaine (ii) Lidocaine

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SOLUTION :
Discussion
12.

During the complete combustion of methane CH_(4), what change in hybridisation does the carbon atom undergo ?

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`SP^(3)` to `sp`
`sp^(3) " to " sp^(2)`
`sp^(2)` to `sp`
`sp^(2) " to " sp^(3)`

ANSWER :A
Discussion
13.

Draw the structure of (i) hex-1-en-3-ol. (ii) 3-aminopentan-2-ol.

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SOLUTION :(i) `UNDERSET("Hex-1-en-3-ol")(OVERSET(6)(C)H_(3)overset(5)(C)H_(2)overset(4)(C)H_(2)-underset(OH)underset(|)overset(3)(C)H-overset(2)(C)H=overset(1)(C)H_(2))`
(ii) `underset("3-Aminopentan-2-ol")(overset(5)(C)H_(3)overset(4)(C)H_(2)-underset(NH_(2))underset(|)overset(3)(C)H-underset(OH)underset(|)overset(2)(C)H-overset(1)(C)H_(3))`
Discussion
14.

During the cleaning action of soap - part of soap dissolves in the dirt and encapsulates to form micelle

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both hydrophyllic and HYDROPHOBIC 
hydrophyllic 
hydrophobic 
CATION

ANSWER :C
Discussion
15.

During the charging of storage cell

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concentration of lead is decreased
lead sulphate concentration is INCREASED
concentration of `H_(2)SO_(4)` is increased
concentration of `PbO_(2)` is decreased

Solution :During the charging of storage CELL following reaction takes PLACE .
`2 PbSO_(4 (S)) + 2H_(2)O (l) to Pb_((S)) + PbO_(2 (S)) + 2 H_(2)SO_(4)`
Concentration of lead sulphate decreases while the concentration of `H_(2)SO_(4) , PbO_(2)` and `Pb ` increases .
Discussion
16.

Draw thestructureof (i)procaine(ii)Lidocaine .

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SOLUTION :
Discussion
17.

Draw the structure of: (i) [Ni(CO)_(4)](ii)[Fe(H_(2)O)_(6)]^(+3)

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SOLUTION :
Discussion
18.

During the charging of lead storage battery, the reaction at anode is represented by:

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`Pb^(2+) +SO_4^(2-) rarrPbSO_4`
`PbSO_4 +2H_2O RARR PbO_2 +SO_4^(2-) +4H^+ + 2E`
`Pb rarrPb^(2+) +2e`
`Pb^(2+)+2e rarrPb`

ANSWER :B
Discussion
19.

During the charging of lead storage battery, the reaction occuring at cathode is represented by

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Formation of `PbSO_4`
REDUCTION of `Pb^(+2)` to Pb
Formation of `PbO_2`
OXIDATION of Pb to `Pb^(2+)`

ANSWER :B
Discussion
20.

Draw the structure of (i) Adenosine (Agonist) (ii) Caffeine (Antagonist)

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SOLUTION :
Discussion
21.

During the bleaching action of SO_(2), it is converted to

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`H_(2)SO_(3)`
`SO_(3)`
`H_(2)S`
`H_(2)SO_(4)`

ANSWER :D
Discussion
22.

Draw the structure of H_(4)P_(2)O_(6) and H_(4)P_(2)O_(7)?

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SOLUTION :(i) `H_(4)P_(2)O_(6)`
`{:("OO"),("||||"),(HO-P-P-OH),("||"),("HOOH"):}`
(ii) `H_(4)P_(2)O_(7)`
`{:("OO"),("||||"),(HO-P-O-P-OH),("||"),("HOOH"):}`
Discussion
23.

During the adsorption of a gas on the surface of a solid , which of the following is true ?

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`DELTA G lt 0 , Delta gt 0 , Delta S lt 0`
`Delta G gt 0 , DeltaH lt 0 , Delta S lt 0`
`Delta G lt 0 , Delta H lt 0 , Delta S lt 0`
`Delta G lt 0 , Delta H lt 0 , DeltaS gt 0`

SOLUTION :In an ADSORPTION process , which is spontaneous , `Delta S ` is negative , `Delta H` is negative (exothermic) acid `DeltaG` is ALSO negative.
Discussion
24.

Draw the structure of H_(3)PO_(2) molecule.

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SOLUTION :
Discussion
25.

During the adsorption of krypton on activated charcoal at low temperature ………..

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`DELTA H GT 0 and Delta S LT 0`
`Delta H lt 0 and Delta S lt 0`
`Delta H gt 0 and Delta S gt 0`
`Delta H lt 0 and Delta S gt 0`

Answer :B
Discussion
26.

During the adiabatic process,

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pressure is maintained constant
gas is isothermally expanded
there is a perssure volume work
The SYSTEM changes HEAT with surrounding

Solution :dq=0, for adiabatic process, which MEANS PERFECT heat insulation.
Discussion
27.

Draw the structure of H_(3)PO_(2) and H_(3)PO_(3)?

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Solution :(i) `H_(3)PO_(2)`
`H-overset(H)overset(|)underset(O)underset(||)P-OH`
(ii) `H_(3)PO_(3)`
`HO-overset(O)overset(||)underset(H)underset(|)P-Oh`
Discussion
28.

During synthesis of 1 molecule of glucose in photosynthesis, the number ATP molecules consumed are

Answer»

18
32
52
108

Answer :A
Discussion
29.

During spontaneous ischage of an electrochemical cell Gibb's free energy will

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Increase
Decrease
Not change
Be infinity

Answer :B
Discussion
30.

Draw the structure of H_(2)S_(2)O_(3) and H_(2)S_(2)O_(4)?

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SOLUTION :(i) `H_(2)S_(2)O_(3)`
`HO-OVERSET(S)overset(||)UNDERSET(O)underset(||)S-OH`
(ii) `H_(2)S_(2)O_(4)`
`HO-overset(O)overset(||)S-overset(O)overset(||)S-OH`
Discussion
31.

During sulphonation, conc. H_2SO_4 is used for

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the INTRODUCTION of `-SO_3H` GROUP in benzene
the introduction of `-SO_4H` group in benzene
the introduction of `-SO_2H` group in benzene
all of these

Answer :A
Discussion
32.

During smelting of copper pyrites, the charge which is introduced in the blast furnace consists of __________.

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ROASTED ORE, COKE and sand
roasted ore, coke and limestone
roasted ore, coke and QUICK lime
roasted ore, coke and sodalime

Answer :A
Discussion
33.

Draw the structure of H_(2)SO_(3) and H_(2)SO_(4)?

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Solution :(i) `H_(2)SO_(3)`
`{:(""O),(""||),(""S),("""/"" ""\"),(HO""OH):}`
(II) `H_(2)SO_(4)`
`HO-overset(O)overset(||)underset(O)underset(||)S-OH`
Discussion
34.

During smelting silica is added to roasted copper ore to remove

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CUPROUS Sulphide
Cuprous Oxide
Ferrous oxide
Ferrrous sulphide

Solution :Extraction of COPPER
Discussion
35.

Draw the structure of H_(2)S_(2)O_(8).

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SOLUTION :
Discussion
36.

During smelting an additional substance is added which combines with impurities to form a fusible product which is known as :

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MUD
slag
flux
gangue

Answer :B
Discussion
37.

Duringsmeltingan additionalsubstance is added which combineswith impurities to formafusiblemass.Theadditionalsubstance iscalled.

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flux
slag
GANGUE
ORE.

ANSWER :A
Discussion
38.

Draw the structure of following molecules: (i) XeF_(4), (ii) HOClO_(3)" (Perchloric acid)" (iii) BrF_(3)

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SOLUTION :(i) `XeF_(4):`
Discussion
39.

Draw the structure of cyclic trimer of acetaldehyde ammonia.

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SOLUTION :
Discussion
40.

Draw the structure of compound (A) having molecular formula C_(5)H_(10)O on the basis of following characteristics: (a) If (A) gives iodoform test and forms isobutyric acid salt and iodoform. (b) If (A) does not reduce Tollen's reagent but gives iodoform test and forms salt of n-Butyric acid.

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Solution :(a) `(A)` is `3`-Methylbutan-`2`-ONE.
`underset(3-"Methylbutan-2-one")(CH_(3)COCH(CH_(3))_(2))overset(I_(2)+KOH)rarrunderset("IODOFORM")(CHI_(3)+(CH_(3))_(2))underset("Isobutyric acid salt")(CHCOOK)`
(b) `(A)` Should be Methyl ketone
`underset("Pentan-2-one "" (A)")(CH_(3)COCH_(2)CH_(2)CH_(3))overset(I_(2)+NAOH)rarrunderset("salt of n-butyric acid")(CHI_(3)+CH_(3)CH_(2)CH_(2)COONa)`
Discussion
41.

During smelting, an additional substance is added which combines with impurities to form a fusible produuct. It is known as :

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Slag
Mud
Gangue
Flux

Answer :D
Discussion
42.

Draw the structure of cis-isomer of [Co(NH_(3) )_(4)Cl_(2)]^(+).

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SOLUTION :STRUCTURE of cis-isomer is GIVEN below :
Discussion
43.

During smelting an additional substanceadded to forma fusibleproduct. It is known as

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Slag
Mud
Gangue
Flux

ANSWER :D
Discussion
44.

During smelting

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slag
mud
gangue
flux

Answer :D
Discussion
45.

Draw the structure of cis-isomer of [Co(NH_3)_4 Cl_2]^+ .

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SOLUTION :
Discussion
46.

During rusting the anode is

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CU
`H_(2)`
Fe
Carbon

SOLUTION :Fe sheet itself acts as an ANODE .
Discussion
47.

During rusting of iron it gets

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oxidised
reduced
Oxidised and hydrated
hydrated

Answer :C
Discussion
48.

During rusting , Fe is

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reduced
oxidised
hydrated
decomposed

Solution :Electromechanism of RUSTING.
Discussion
49.

During rusting, iron gets :

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OXIDIZED
REDUCED
EVAPORATED
decomposed.

Answer :A
Discussion
50.

DuringRoasting of ZnS, it converts to :

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`ZNO`
`ZnSO_4`
`ZnCO_3`
`ZN`

ANSWER :D
Discussion