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 2-methylcyclopent-3-ene-1-carboxylic acid.

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SOLUTION :
Discussion
2.

During nuclear explosion, one of the products is .^(90)"Sr"with half-life of 28.1 y. If 1mug " of "^(90)"Sr" was absorbed in the bones of a newly born baby instead of calcium, how much of it will remain after 10y and 60y if it is not lost metabolically.

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Solution :Given, DECAY constant of `.^(90)"Sr"=(0.693)/(t_(1//2))=(0.693)/(28.1)`
`"" =2.47xx10^(-2)y^(-1)`
Amount LEFT after 10t: `K=(2.303)/(t)log.(a)/(a-x)`
Given, `a=1,t=10y,k=2.47xx10^(-2)y^(-1)`
`therefore2.47xx10^(-2)=(2.303)/(10)log.(1)/(a-x)`
or, `log(a-x)=-0.1072" or, " (a-x)=0.7813mug`
Amount left after 60y `2.47xx10^(-2)=(2.303)/(60)log.(1)/(a-x)`
or, `log(a-x)=-0.6435" or, " (a-x)=0.2272mug`
Discussion
3.

During nitration of benzene with a mixture of concentrated nitric aciid and concentrated sulphuric acid, nitric acid acts as a base. Explain.

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Solution :Both `HNO_(3) and H_(2)SO_(4)` are strong acids but `H_(2)SO_(4)` is a stronger acid than `HNO_(3)`. Therefore, during nitration, `H_(2)SO_(4)` acts as an acid RELEASING a proton. `HNO_(3)`, on the other hand, accepts this proton and thus acts as a base. the protonated NITRIC acid then loses a proton to form nitronium ION which then brings about the nitration.
.
Discussion
4.

Draw the structure, give IUPAC names and indicate primary,secondary and tertiary amines in the following: Five isomeric amines of formula C_7H_9N having one benzene ring

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Solution :FIVE isomeric amines of FORMULA `C_7H_9N` that CONTAIN a BENZENE ring are :
Discussion
5.

During monoalkylation of benzene with CH_(3)CI in presence of anhydrous AICI_(3) an excess ofC_(6)H_(5) nmust be used because this will

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increase the chance for collision between `CH_(3)^(+)`and `C_(6)H_(6)`
decrease collision between `CH_(3)^(+)` and `C_(6)H_(5)CH_(3)`
increase the collision between `CH_(3)^(+)` and `C_(6)H_(5)CH_(3)`
decrease the chance for collision between `CH_(3)^(-) ` and `C_(6)H_(6)`

Answer :A, B
Discussion
6.

During manufacture of chlorine from brine -

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`DELTAG^(@)` of the overall REACTION is `-ve`
`DeltaG^(@)` of the overall reaction is `+ve`
the value of `DeltaE^(@)` of the overall reaction is `-ve`
the value of `DeltaE^(@)` of the overall reaction is `+ve`

ANSWER :B::C
Discussion
7.

Draw the structure, give IUPAC names and indicate primary,secondary and tertiary amines in the following: Eight isomeric amines of formula C_4 H_(11) N

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Solution : Eight ISOMERIC amines of formula `C_4 H_(11) N` are :
1. `CH_3 CH_2CH_2CH_2NH_2` (butan-1-amine, primary)
2.` CH_2 CH_2 CH(NH_2) CH_3`(butan-2-amine, primary)
3. `CH(CH_3)_2CH_2NH_2`(2-methylpropan-1-amine, primary)
4. `C(CH_3)_2 NH_2` (2-methyl-propan-2-amine, primary)
5. `CH_3 CH_2CH_2 NHCH_3` (N-methylpropanamine , secondary)
6. `CH(CH_3)_2NHCH_3` (N-methylpropan-2-amine , secondary)
7. `CH_3 CH_2 NHC_2 H_5` (N-ethylethanamine, secondary)
8. `CH_3 CH_2 N(CH_3)_2 `(N,N-dimethylethanamine: tertiary).
Discussion
8.

During Lassaigne's test, N and S present in an organic compound changes into

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`Na_2S and NACN`
`NASCN`
`Na_2SO_4` and NaCN
`Na_2S and NaCN`.

ANSWER :A
Discussion
9.

Draw the structure and write the hybridisation in (i) [Fe(CO)_(5)] (ii) trans-[Co(NH_(3))_(4)Cl_(2)]^(+) (iii) No(CO)_(4) (iv) cis-[Co(NH_(3))_(4)Cl_(2)]^(+) (v) [NiCl_(4)]^(2-)

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SOLUTION :(i) `DSP^(3)` (trigonal bipyramidal) (ii) `d^(2)sp^(3)` (octahedral) (III) `sp^(3)` (TETRAHEDRAL) (iv) `d^(2)sp^(3)` (octahedral)(V) `sp^(3)` (tetrahedral)
Discussion
10.

Draw the structure and name the product formed if the following alcohols are oxidised. Assume than an excess of oxidising agent is used. (i) CH_(3)CH_(2)CH_(2)CH_(2)OH (ii) 2-butenol (iii) 2-methyl-1-propanol.

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Solution :(i) OXIDATION of saturated alcohols is usually carried out with strong oxidising gents such as `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)` or `KMnO_(4)//OH^-` which first gives the corresponding aldehydes annd then the corresponding acids. For example,
`underset("1-Butanol")(CH_(3)CH_(2)CH_(2)CH_(2)OH) underset([O])overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to underset("BUTANAL")(CH_(3)CH_(2)CH_(2)CHO) underset([O])overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to underset("Butanoic acid")(CH_(3)CH_(2)CH_(2)COOH)`
(ii) Oxidation of unsaturated alcohols such as 2-butenol is carried out with `PC C//CH_(2)Cl` because oxidation with stronger oxidising aents such as `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)` or `KMnO_(4)//OH^(-)` will bring about cleavage at the double bond. further, with `PC C//CH_(2)Cl_(2)`, oxidation stops at the aldehyde stage evenn if excess o the reagent is used.
`underset("2-Butenol")(CH_(3)-CH=CH-CH_(2)OH) underset([O])overset(P C C//CH_(2)Cl_(2))to underset("2-Butenal")(CH_(3)-CH-CHO)`
(iii) `underset("2-Methyl-1-propanol")(CH_(3)-overset(CH_(3))overset(|)(C)H-CH_(2)OH) underset([O])overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to underset("2-Methylpropanal")(CH_(3)-overset(CH_(3))overset(|)(C)H-CHO) underset([O])overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to underset("2-Methylpropanoic acid")(CH_(3)-overset(CH_(3))overset(|)(C)H-COOH)`
Discussion
11.

During leaching of bauxite, hydroxides of which elements are precipitated ?

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Fe and AL 
Fe and TI 
Ti and Cu 
ZN and Ti 

SOLUTION :In presence of NAOH (conc.), the oxides of Fe and Ti are precipitated as hydroxides.
Discussion
12.

Draw the structure and predict the shape of (i) XeO_(3), and (ii) BrF_(3).

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SOLUTION :(i) `XeO_(3)` :
Discussion
13.

During Lassaigne's test N and S present in an organic compound change into

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`Na_(2)S` and `NACN`
`NASCN`
`Na_(2)SO_(4)` and `NaCN`
`Na_(2)S` and `NaSCN`

ANSWER :A
Discussion
14.

Draw the structure and name the product formed if the following alcohols are oxidized. Assume that an excess of oxidizing agent is used. (i) CH_(3)CH_(2)CH_(2)CH_(2)OH (i) 2-butenol (iii) 2-methyl-1-propanol

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Solution :(i) `UNDERSET("BUTANOIC acid")(CH_(3)CH_(2)CH_(2)COOH`
(ii) `underset("But-2-en-1-oic acid or 2-butenoic acid")(CH_(3)-CH=CH-COOH)`
(iii) `underset("2-methyl propanoic acid")(CH_(3)-CH(CH_(3))-COOH)`
Discussion
15.

Draw the structure and IUPAC name of the following compounds. (i) Mesityl oxide (ii) Acetophenone (iii) Benzophenone

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SOLUTION :
Discussion
16.

Draw the structure and IUPAC name of the following compounds. (i) Acrolein (ii) Crotonaldehyde (iii) Glyceraldehyde

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SOLUTION :
Discussion
17.

During isothermal transformation of an ideal gas, internal energy:

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INCREASE as the PRESSURE increases
Decreases as the VOLUME decreases
Decreases as the pressure decreases
remains fixed

Answer :D
Discussion
18.

Draw the structural formulae of the following molecules : (i) XeF_4(ii) H_2S_2O_7

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SOLUTION :STRUCTURES of the COMPOUNDS are GIVEN as under:
Discussion
19.

Draw the structure of hex-1-en-3-ol compound.

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SOLUTION :`CH_(3)-CH_(2)-CH_(2)-underset(OH)underset(|)(C)-CH=CH_(2)`
Discussion
20.

During isothermal transformation of an ideal gas energy

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DECREASES as the PRESSURE decreases
Decreases as the volume decreases
INCREASES the pressure increases
Remains fixed

Answer :D
Discussion
21.

Draw the structural formulae of the following compounds : XeF_4

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SOLUTION :
Discussion
22.

During isothermal expansion of an ideal gas its

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INTERNAL ENERGY increase
enthalpy increase
enthalpy REMAINS unaffected
enthalpy REDUCES to zero

Answer :C
Discussion
23.

Draw the structural formula of the following compounds. (i) 2-methyl -1-nitropropane (ii) 2,2-dimethyl-1-nitropropane (iii) Nitrobenzene

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SOLUTION :(i) `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)NO_(2)""` 2-methyl-1-nitropane
(ii) `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)NO_(2)""`2,2-dimethyl -1- NITROPROPANE
(iii) `""` NITROBENZENE
Discussion
24.

During initial treatment preferential wetting of ore by oil and gangue by water takes place in

Answer»

Levigation
Bessemerisation
LEACHING
Froth FLOTATION

Answer :D
Discussion
25.

Draw the structural formula of the following compounds (i) 2-nitro-1-methyl benzene (ii) 1,3,5-trinitrobenzene (iii) 2-phenyl -1- nitroethane

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SOLUTION :
Discussion
26.

During hydrogenation of oils,higher melting point 'vegetable ghee' is formed because :

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Hydrogen is dissolved in the oil
Hydrogen COMBINES with oxygen of the oil
ESTER of unsaturated FATTY ACIDS are reduced to those of saturated acids
Hydrogen drives off the impurities from the oil

Answer :C
Discussion
27.

Draw the structural formulae of the following compounds : H_4P_2O_5

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SOLUTION :
Discussion
28.

Draw the structural formula of 2 - methylpropan -2- ol molecule.

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SOLUTION :Structrual formula of 2 - methylpropan -2- ol is
`CH_(3)-overset(CH_(3))overset("|")underset(OH)underset("|")"C "-CH_(3)`
Discussion
29.

Draw the structural formula of

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SOLUTION : (i)3-cyano butanoic acid (ii() 2-bromo-3-chloro-3-metyl pentane nitrile
(ii) 2-bromo-3-chloro -3-methyl pentane nitrile `C_(2)H_(5)-UNDERSET(Cl)underset(|)OVERSET(CH_(3))overset(|)(C)-underset(Br)underset(|)(CH_(2))-CN`
Discussion
30.

Draw the structural formula of 2-methylpropan-2-ol molecule.

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Solution :`CH_(3)-underset(CH_(3))underset(|)OVERSET(OH)overset(|)(C)-CH_(3)`
Discussion
31.

During hydrogenation of oils vegetable ghee is formed. In this process :

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Hydrogen is dissolved in the oil
Hydrogen combines with `O_2` of the oil
ESTERS of UNSATURATED fatty ACIDS are REDUCED
to those of saturated acids.
Hydrogen drives off impurities from the oil

Answer :C
Discussion
32.

During hydrogenation of oils, vegetable ghee is formed because:

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HYDROGEN is dissolved in the oil
hydrogen combines with `O_(2)` of the oil
esters of UNSATURATED fatty ACIDS are reduced to those of saturated fatty acids
hydrogen derives of the IMPURITIES from the oil

Answer :C
Discussion
33.

Draw the structural formula of 1 - phenylpropan -1- one molecule.

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SOLUTION :`UNDERSET(3)(CH_(3))-underset(2)CH_(2)-OVERSET(C_(6)H_(5))overset("|")underset("1")"C "=O`
Discussion
34.

Draw the structural formula of 1-phenlypropan-1-one molecule.

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SOLUTION :
`CH_(3)CH_(2)-C=O`
`1-Phenylpropan-1-one
Discussion
35.

During hydrogenation of oils catalyst commonly used is:

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`Pd or CuCl_2`
FINELY DIVIDED Ni
Fe
`V_2O_5`

Answer :B
Discussion
36.

Draw the structural formula and write the IUPAC name of (i) N,N- dimethyl aniline (ii) Benzyl amine (iii) N-methyl benzylamine

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SOLUTION :
Discussion
37.

During Hoope's process for electrolytic refining of Al, the middle layer is of

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pure aluminium
impure aluminium
cryolite and `BaF_(2)`
ALLOYS of Al, Ca, Si

ANSWER :C
Discussion
38.

Draw the structural formula and write the IUPAC name of (i) Methyl isopropyl amine (ii) Diethyl buty amine (iii) Ethyl methyl ispropylamine

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Solution :(i) Methylisopropyl amine: `CH_(3)-overset(..)(N)H-underset(CH_(3))underset(|)(CH)-CH_(3)` N- methyl propan-1-amine
(ii) DIETHYL butyl amine: `C_(2)H_(5)-underset(C_(2)H_(5))underset(|)overset(..)(N)-CH_(2)-CH_(2)-CH_(2)-CH_(3)` N,N-Diethyl butan -1- amine
(iii) Ethyl methyl ispropylamine `CH_(3)-underset(C_(2)H_(5))underset(|)overset(..)(N)-underset(CH_(3))underset(|)(CH)-CH_(3)` N-ethyl-N-methyl propan-2-amine
Discussion
39.

Duringhomolytic fission_____ areformed.

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carbocations
ions
carbonions
free radicals

Answer :D
Discussion
40.

Draw the structrual formula of hex -2- en -4- ynoic acid.

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SOLUTION :`CH_(3)-C-=C-CH=CH-OVERSET(O)overset(||)C-OH`
Discussion
41.

Draw the strictural formula of the alkaene that reacts with ozone followed by dimethyl sulphide to give the following products. C_10H_16overset((i)O_3)underset((ii) CH_3-S-CH_3)rarrCH_3-overset(O)overset(||)C-CH_3+CH_3-overset(O)overset(||)C-CH_3+OHC-CH_2-CHO

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SOLUTION :
Discussion
42.

Draw the simple Fisher projection formulae of D - (+) -glucoseandD -(-)- fructose .

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SOLUTION :The Fishes projection or FISHER projection forula is a conventionused to DEPICT a stereo formula in TWO - dimension without DESTROYING the stereochemical information .

Discussion
43.

Draw the shape of the following molecules: (a) XeF_(4)"" (b) HClO_(4)

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SOLUTION :
Discussion
44.

During heterolytic fission , which species retain shared pair of electron ?

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LESS electronegative ELEMENT
More electronegative element
Electropositive element
EITHER (A) or (C)

Answer :B
Discussion
45.

Draw the seven types of primitive erystal systems.

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SOLUTION :
Discussion
46.

During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can given the best results ?

Answer»

COLOUMN chromatography
Solvent extraction
Distillation
Thin LAYER chromatography

Answer :D
Discussion
47.

Draw the repeating structural units of the step- growth polymers you would expect to obtain from the following reactions. (a) BrCH_(2)CH_(2)CH_(2)Br+HOCH_(2)CH_(2)CH_(2)Ohoverset("Base")to (b) HOCH-(2)CH_(2)OH+HOOC(CH_(2))COOHoverset(H^+)to

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Solution :(a)`-CH_(2)CH_(2)CH_(2)O-`
(II) `-OCH_(2)CH_(2)O-CO(CH_2)_(6)CO-`
Discussion
48.

During glycolysis acetyl co-enzyme is formed from

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Pyruvate with a LOSS of CARBONYL group
Citric acid cycle
Directly from glucose
None of these

Solution :During glycolysis acetyl co-enzyme is obtained from pyruvate with a loss of carbonyl group.
Discussion
49.

Draw the products of the following reaction with organometallic reagent.

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SOLUTION :
Discussion
50.

During galvanization of iron, which metal is used for coasting iron surface?

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Copper
Zinc
Nickel
Tin

Solution :Because zinc get oxidized first when comes in contact with MOISTURE and hence IRON SURFACE is protected from corosion due to NEGATIVE SRP VALUE.
Discussion