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.

During charging of a lead storage battery, the following reaction occurs at the cathode

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`Pb-2E^(-) to Pb^(2+)`
`Pb^(2+)+2e^(-) to Pb`
`Pb^(2-)+SO_(4)^(2-) to PbSO_(4)`
`PbSO_(4)+2H_(2)O to 2PbO_(2)+4H^(+)+SO_(4)^(2-)+2e^(-)`

Solution :During charging of lead ACCUMULATOR , REVERSE reaction takes place . `therefore` Pb plates become cathode.
Discussion
2.

Draw structure Marshall's acid (H_(2)S_(2)O_(8))

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Discussion
3.

During bleaching of chlorine an antichlor is used to

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ENHANCE BLEACHING action
Eliminate LAST traces of bleaching agent
Remove GREASES from the fibre
Liberate oxygen

Answer :B
Discussion
4.

Draw structure Hyponitrous acid (H_(2)N_(2)O_(2))

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Discussion
5.

During beta- decay

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An ATOMIC electron is ejected
An electron which is already present with in the nucleus is ejected
A NEUTRON in the nucleus decays EMITTING an electron
A part of BINDING of the nucleus is converted into an electron

Answer :C
Discussion
6.

Draw structure H_(2)S_(2)O_(4)

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Discussion
7.

Draw structure HClO_(4)

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Discussion
8.

During bessemerisation of copper, the reaction taking place in the bessemer convertor is:

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`Cu_2S + 2Cu_2Orarr 6Cu + SO_2`
`Cu_2S + FES RARR Cu_2S + FEO`
`FeO + SiO_2 rarrFeSiO_3`
None

Answer :A
Discussion
9.

Draw structure H_(2)SO_(4)

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Discussion
10.

Draw structure H_(2)PO_(3)^(-)

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Discussion
11.

During bessemerisation of copper, the reaction taking place in the bessemer conventor is

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`Cu_(2)S+2Cu_(2)O to 6Cu+SO_(2)`
`Cu_(2)O+Fes to Cu_(2)S+FeO`
`FeO+SiO_(2) to FeSiO_(3)`
None of these

Solution : During the bessemerisation of copper, the REACTION TAKING place in the bassemer CONVERTER is auto REDUCTION and slag formation.
`Cu_(2)S+2Cu_(2)O to 6Cu+SO_(2) , FiO+SiO_(2) to FeSiO_(3)`
Discussion
12.

Draw structure H_(2)P_(2)O_(5)^(2-)

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Discussion
13.

During an isothermal expansion of an ideal gas its

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INTERNAL energy increases
Enthalpy decreases
Enthalpy REMAINS unaffected
Enthalpy REDUCES to zero

Solution :During isothermal EXPANSION of idea gas, `DeltaT=0`
`DeltaH=DeltaE+PDeltaV=DeltaE+nRDeltaT=0+0=0`.
Discussion
14.

Draw structure Dithionate ion (S_(2)O_(6)^(2-))

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Discussion
15.

During an electrolysis of conc. H_(2)SO_(4) perdisulphuric acid (H_(2)S_(2)O_(6)) and O_(2) form in equimolar amount. The amount of H_(2) than will form simultaneously at other electrode will be (2H_(2)SO_(4)toH_(2)S_(2)O_(8)+2H^(+)+2e^(-))

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thrice that of `O_(2)` in moles
twice that of `O_(2)` in moles
equal to that of `O_(2)` in moles
half of the of `O_(2)` in moles

Solution :Anode `{{:(2H_(2)SO_(4)toH_(2)S_(2)O_(8)+2H^(+)+2e^(-)),(2H_(2)OtoO_(2)+4H^(+)+4e^(-)):}}`
`underline(" Cathode")""{2H_(2)OtoH_(2)+2OH^(-)-2e^(-)}3)`.
Net: `2H_(2)SO_(4)+8H_(2)OtoH_(2)S_(2)O_(8)+O_(2)+3H_(2)+6H^(+)+6OH^(-)`
HENCE ratio of `n_(O_(2))` and `n_(H_(2))` is `1:3`
Discussion
16.

Draw structure CuSO_(4).5H_(2)O

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Discussion
17.

During an adiabatic process:

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PRESSURE is MAINTAINED constant
Gas is isothermally expanded
There is perfect heat insulation
The SYSTEM CHANGE heat with surroundings

Answer :C
Discussion
18.

Draw structure CsH_(2)PO_(2)

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Discussion
19.

During Aluminothermy one mole of Cr_(2)O_(3) reduced to Cr. How many no. of the moles of Al required.

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Solution :Alluminothermite PROCESS is `Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr` thenumber of moles of AL are REQUIRED will be 2.
Discussion
20.

Draw structure Caro's acid (H_(2)SO_(5))

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Discussion
21.

During AgNO_(3) test for detection of halogens. Sodiam extract is boiled with a few drops of conc HNO_(3) to decompose

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NaCN
`NA_(2)S_(g)`
both A and B
None of these

Answer :C
Discussion
22.

Draw structure Cl_(2)O_(7)

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Discussion
23.

During alpha-decay, n/p ratio :

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DECREASES
INCREASES
REMAINS same
may INCREASE or decrease.

Answer :B
Discussion
24.

Draw structure (CN)_(2)

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Discussion
25.

Draw structure Calcium carbide (CaC_(2))

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Discussion
26.

During alcoholic fermentation inorganic salts like ammonium phosphate are added :

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To decrease the freezing point of solution
Which act as FOOD for ferment cells
Which prevent the growth of undersirable becteria
Which PRODUCE DESIRABLE enzymes

Answer :B
Discussion
27.

Draw structure CaCN_(2)

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Discussion
28.

During addition polymerisation of ethene molecules , the initiator like benzoyl peroxide , acetyl peroxide , tert-butyl peroxide , etc ., are added . Their function is to

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ENSURE anti-Markownikoff's addition of molecules to form polymer
GIVE cations during the reaction which join together to form bigger molecules
decrease the temperature of the reaction mixture
generate free radical which ADDS to the monomer to give bigger free radical .

Solution :Free radical is generated by peroxide in the CHAIN initiating step . The free radical join with monomer to PROPAGATE the chain .
Discussion
29.

Draw resonance structures for the following (i) CH_(3)COO^(-) (ii) CH_(3)CONH_(2) (iii) C_(6)H_(5)CHO (iv) C_(6)H_(5)COO^(-)

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SOLUTION :
Discussion
30.

During a seminar a student asked another student, "Can NaCl give flame test?" Write the name of the point which is responsible forthe colour of alkali metal halides having excess metal ions.

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SOLUTION :F-centre ELECTRON TRAPPED ANION vaccancy
Discussion
31.

Draw polygon formulae for C_(5)H_(10)O.

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ANSWER :`(##GRB_ORG_CHM_P1_C03_E02_017_A01##)`
Discussion
32.

Draw structure Ammonium phosphine

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Discussion
33.

During activation of charcoal -

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`O_2` is adsorbed on CHARCOAL 
Moisture is ABSORBED on charcoal
Pre adsorbed material is desorbed
Charcoal is COVERED with inert gas

Answer :C
Discussion
34.

During a seminar a student asked another student, "Can NaCl give flame test?" Write the colour of sodium during flame test.

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SOLUTION :GOLDEN YELLOW
Discussion
35.

Draw other resonating structures related to the given structure and find out whether the functional group present in the molecule is ortho, para directing or meta directing.

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Solution :
The resonating structures for HALOARENES or aryl halide are:
the halogen atom (X) is ortho and para DIRECTING since both these position in the RING get activated DUE to resonance.
Discussion
36.

During a reversible adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratioC_P/C_V for the gas is

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`3//2`
`7//2`
`5//3`
`9//7`

Solution :According to the equation,
`Pprop T^3 ` or `P = kT^3 RARR PT^(-3) = K`…(i)
Now , for reversible adiabatic process
we have `T^GAMMA. P^(1 - gamma)= k`…..(II)
` rArr T^((gamma)/(1 - gamma)) .P = k`....(III)
compare (i) and (iii) , we get
`(gamma)/(1- gamma)=- 3 rArr gamma = 3/2`
Discussion
37.

Draw structure C_(3)O_2

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Discussion
38.

During a seminar a student asked another student, "Can NaCl give flame test?" a) Write your answer.

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ANSWER :YES
Discussion
39.

Duringa beta- decay

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an atomic electron is ejected
an electron which is already present WITHIN the nucleus is ejected
a NEUTRON in the nuclear decays EMITTING an electron
a part of BINDING ENERGY of the nucleus is converted into an electron.

Answer :C
Discussion
40.

Draw other resonance structures related to the following structure and find out whether the functional group present in the molecule is ortho, para directing or meta directing.

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<P>

SOLUTION :
The electron density is more concentrated at o - and p - POSITIONS. THUS, the FUNCTIONAL group is o - and p - directing.
Discussion
41.

During a column chromatography through Al_(2)O_(3) column, a mixture of components A,B and C is passed through the column. On adding eluant, compound 'A' is eluted first then 'B' and in the end 'C'. Which of the following statements regarding the components is correct ?

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The ORDER of adsorption of A, B and C is `C gt B gtA`
The order of adsorption of A,B and C is `A gt B gt C`
The order of adsorption of A,B and C is `B gt A gt C`
The order of adsorption of A, B and C is `B gt C gt A`

Solution :Since compound 'A' COMES out before 'B','B' is more readily adsorbed to the column and 'B' comes out before 'C'. HENCE 'C' is more readily adsorbed than 'B'. Hence , the order of adsorption is `C gt B gt A.`
Discussion
42.

Draw other resonance structures related to the following structure and find out whether the functional fgroup present in the molecule is ortho, para directing or meta directing.

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Solution :Resonance in halobenzene

From the above RESONATING structure it is very CLEAR that electron density is rich at ORTHO and PARA POSITION. Therefore, it is ortho and para directing and not meta directing
Discussion
43.

During a deacay of 952gm ._(92)U^(238) "to" ._(82)Pb^(206) , total 18xx10^(24) alpha-"particle" are emitted , number of half lives completed in this decay are:

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5
4
3
6

Answer :B
Discussion
44.

During a chemical reaction, the concentration of reaction

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increases
DECREASES
remains CONSTANT
FIRST increases and then decreases

ANSWER :B
Discussion
45.

Draw one of the geometrical isomers of thecomplex [Pt(en)_(2)Cl_(2)]^(2+) which is optically inactive . Also write the name of this entity according to the IUPAC nomenclature .

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SOLUTION :
IUPAC name: Dichloridobis (ETHEN -1, 2--daimine ) Platinum (IV) ION .
Discussion
46.

Durig alkaline hydrolysis of 3^(@) alkyl halide, if cencentration of aq. Potash is doubled, the rate of reaction is,

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double
remaine same
tripe
upredictable

Solution :Because RATE of REACTION depends upon concentration of ANLY `3^(@)` ALKYL halide not on concentration of aq. POTASH.
Discussion
47.

Draw one of the geometrical isomers of the complex [Pt(en)_(2)Cl_(2)]^(2+) which is optically inactive.

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SOLUTION :GEOMETRICAL ISOMER
Discussion
48.

Draw one of the geometrical isomers of the complex [Pt(en)_(2)Cl_(2)]^(2+) which is optically active.

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SOLUTION :Geometrical ISOMER of `[Pt(EN)_(2)Cl_(2)]^(2+)`which is OPTICALLY active :
Discussion
49.

Draw neat and labelled diagram of dry cell.

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Solution :A NEAT LABELLED diagram of DRY CELL :
Discussion
50.

Draw neat and labelled diagram of Besemer converter used in the extraction of copper.

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Solution :Bessemer converter used in extraction of copper :
Copper METAL is extracted from molten matte through bessemerisation. The matte is introduced into bessemer converter which uphold by tuyeres.
The air is blown through the molten matte. BLAST of air converts `Cu_(2)S` partly into `Cu_(2)O` which reacts with remaining `Cu_(2)S` to give molten copper.

`2Cu_(2)S+3O_(2)to2Cu_(2)O+2SO_(2)`
`2Cu_(2)O+Cu_(2)Sto6Cu+SO_(2)`
The copper so obtained is called ''Blister copper'' because as it SOLIDIFIES, `SO_(2)` hidden in it escapes out as bubbles producing blister on its surfaces. The blister copper is `99%` pure.
Discussion