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.

Two volatile liquids A and B differ in their boiling points by 15K. The process which can be used to separate them is

Answer»

FRACTIONAL DISTILLATION
STEAM distillation
distillation under REDUCED pressure
simple distillation

Answer :A
Discussion
2.

Which of the following is not cyclic compound?

Answer»

Benzene
Napthalene
Neopentane
Aniline

Answer :C
Discussion
3.

When 2-butyne is treated with dil. H_2SO_4//HgSO_4, the product formed is

Answer»

butanol-1
butanol-2
2-butanone
butanal

Solution :`UNDERSET"2-Butyne"(CH_3-C-=C-CH_3+H_2O) OVERSET(H_2SO_4 // HgSO_4)to underset"2-Butanone"(CH_3COCH_2H_3)`
Discussion
4.

Which are the various steps of electrophilic substitution of benzene ?

Answer»

Solution :Electrophilic (E) Substitution (S), reactions of benzene are shortly KNOWN as aromatic `S_(E)`. Aromatic `S_(E)` REACTION occurs in three steps :
(i) Steps involve in formation of electrophile
(ii) Steps involve in formation of intermediate which is a slow STEP.
(iii) Step involve in liberation of PROTON from intermediate carbocation (`sigma`-complex) and produce substituted product This step is fast and is not rate determining.
Discussion
5.

Which of the following structures is the most perferred and hence of lowest energy for SO_(3) ?

Answer»




Solution :Generally, the LOWEST energy strcuture is the one
having the smallest FORMAL charges on ehgt ATOMS.
Hence , option (d) is correct . Alternatively , (d) has
maximum NUMBER of covalent bonds .
Discussion
6.

Which of the following has the lowest boiling points?

Answer»

2-Methylbutane
2-Methylpropane
2,2-Dimethylpropane
n-Pentane

Solution :For the compounds with same molecular mass, BOILING POINT decreases with INCREASE in BRANCHING. Boililng point also INCREASES with increase in molecular mass.
Discussion
7.

Which coordinated numbered complexes are formed by EDTA with most metal ions in solution

Answer»


SOLUTION :EDTA is an EXAMPLE of Hexadentate legand `MG^(2+)` and `Ca^(2+)` FORM six coordenated complexes with EDTA
Discussion
8.

Which of the following changes is not realised in the laboratory?

Answer»

Absoption OS NO by alkaline sodium SULPHITE to from a compound
Combustion of metallic Mg in `CO_(2)`
Heating hydrated magnesium chloride to GET the anhydrous salt

Answer :3
Discussion
9.

Which type of covalent bond is form by hybrid orbitals ?

Answer»

SOLUTION :SIGMA type COVALENT BOND is formed.
Discussion
10.

Which of the followings is not true about the ionic solids ?

Answer»

BIGGER ions form THECLOSE packed STRUCTURE.
Smaller ions occupy either the tetrahedral or the OCTAHEDRAL voids depending upon their size.
Occupation of all the voids is not necessary
The fecation of octahedral or tetradheral voids occupied depneds upon the radii of the ions occupying the voids.

Solution :Tetrahedral voids are alwaysdouble than octahedral, VOID. Hence (d) is not true.
Discussion
11.

which of the following statements are true?

Answer»

flocculation value is inversely proportional to the coagulating power.
colloidal silica is a PROTECTIVE colloid
alum is USED for cleaning MUDDY water.
gelatin is added in ice CREAM. It acts as emulsifier.

Answer :A,C,D
Discussion
12.

Which one of the following pairs gives effervescence with aq. NaHCO_(3)? I. CH_(3)COCl II. CH_(3)COCH_(3) III. CH_(3)COOCH_(3) IV. CH_(3)COOCOCH_(3)

Answer»

I and II
I and IV
II and III
I and III

Solution :Both `CH_(3)COCL` and `CH_(3)COOCOCH_(3)` react with `H_(2)O` to produce acid and hence GIVE effervescence with aqueous `NaHCO_(3)`
Discussion
13.

Which one of the following has only primary hydrogen atom?

Answer»

isobutane
propanamide
cyclohexane
2, 3-dimethyl-2butene

Solution :`H_(3)C-UNDERSET(underset(CH_(3))(|))(C )=underset(underset(CH_(3))(|))(C )-CH_(3)`
Discussion
14.

The stability off K_(2)O,K_(2)O_(2) and KO_(2) is in order K_(2)O lt K_(2)O_(2) lt KO_(2). This increasing stability as the size of metal ion increases is due to stabilisation of

Answer»

larger CATION by smaller anions through lattice ENERGY effects
larger cation by larger anions through lattice energy effects
smaller cations by smaller anions through melting point
smaller cations by larger anions through melting point.

Answer :B
Discussion
15.

Which equation gives the quantitative temperature dependence of equilibrium constant ?

Answer»

HESS LAW
GRAHAM's diffusion
Van't Hoff
Van DAE Waals

Answer :C
Discussion
16.

To get an n-type semiconductor from silicon, it should be doped with a substances with valence _____

Answer»

2
1
3
5

Answer :d
Discussion
17.

Which one is main cause for deforestation?

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URBANIZATION
INDUSTRIALIZATION
Over POPULATION
All of these

Solution :All of these
Discussion
18.

Which statement(s) is correct,

Answer»

<P>`((DELTA H)/(delta T))_(P) - ((delta U)/(delta T))_(V) = R`
`((delta H)/(delta T))_(P) gt ((delta U)/(delta T))_(V)`
`((delta H)/(delta V))_(T)` for ideal gas is zero
All of these

Solution :`((del H)/(del T))_(P) = C_(P) ((del u)/(del T))_(V) = C_(V)`
Discussion
19.

What is meant by intramolecular hydrogen bond? Give one example

Answer»

Solution :INTRA molecular hydrogen bonds are those which occur within ONE single molecule. This OCCURS between two functional groups within a molecule.
Eg :ortho - NITROPHENOL and salicyladehyde.
Discussion
20.

Which of the following is the weakest base ?

Answer»

`Ca(OH)_(2)`
`KOH`
`LiOH`
`Sr(OH)_(2)`

Solution :LiOH is the weakest base since Li is most electronegative among `K^(+) , Na^(+) , MG^(2+) , Ca^(2+)`.
Discussion
21.

Which of the following have least ionization enthalpy?

Answer»

Be
MG
CA
SR

ANSWER :D
Discussion
22.

Which effect is observed in Isothermal graph with temperature ?

Answer»

SOLUTION :Value of K changes with CHARGE with temperature.
SLOPE increases if temperature increases.
Slope : `T_(3)GT T_(2)gt T_(1)` where,
Temperature : `T_(3)gt T_(2)gt T_(1)`
Discussion
23.

Which of the following reagents give white precipitate with MgSO_(4) solution, which is readily soluble on addition of ammonium salts?

Answer»

`NaOH`
`(NH_(4))_(2)CO_(3)`
`Na_(2)CO_(3)`
`Na_(2)HPO_(4)`

Answer :A::B::C
Discussion
24.

Which of the following cannot be used for detecting formic acid ?

Answer»

`NaHCO_(3)`
Fehling solution
bromine water
2, 4-Dinitrophenylydriazine

Solution :DNP REAGENT is USED to detect the PRESENCE of carbonyl GROUP
Discussion
25.

Which of the following molecules has the electronic configuration ? (sigma 1s)^(2) , (sigma^(**) 1s)^(2) , (sigma 2s)^(2) , (sigma^(**) 2s)^(2) (pi 2p_(x))^(2) = (pi 2p_(y))^(2) , (sigma 2p_(z))^(2)

Answer»

CO
NO
`O_(2)`
`F_(2)`

ANSWER :A
Discussion
26.

Which of the following is correct name according to the IUPAC rules?

Answer»

2-Methylcyclohexane
2-Ethyl-2-methylpentane
3,4-Diamethylpentane
3-Ethyl-2methylpentane

Answer :D
Discussion
27.

Which of the following is not an oxo salt of alkali metals?

Answer»

`Na_(2)CO_(3)`
`KNO_(3)`
`CsNO_(2)`
`RbCl`

Answer :D
Discussion
28.

The treatment of ethyl formate with excess of RMgX gives …………………….. .

Answer»

`R - UNDERSET(O)underset(||)C-R`
`R - underset(OH)underset(|)C-R`
`R - CHO`
`R - O - R`

SOLUTION :`R - CHO`
Discussion
29.

Which of the following option is correct for the given equation ? 4NH_(3(g)) + 5O_(2(g)) to 4NO_((g)) + 6H_(2) O_((g))

Answer»

`Delta H = Delta U`
`Delta H LT Delta U`
`Delta U gt Delta U`
`Delta H NE Delta U`

Answer :C
Discussion
30.

Which statement is incorrect about diastereomers

Answer»

They are non-mirror images
Physical PROPERTIES are different
Both may or may not be OPTICALLY acitve
Both possess IDENTICAL optical rotation

Solution :Both possess identical rotation
Discussion
31.

What is the rate of reaction with Cl_(2), Br_(2) and I_(2) with CH_(2) -= CH_(2).

Answer»

Solution :Reactivity order `Cl_(2) gt Br_(2) gtI_(2)`. Rate of REACTION of ALKYNE with iodine `(I_(2))` is so SLOW hence special condition is required to ARRANGE EQUILIBIRUM.
Discussion
32.

What is homologous series ? Give example

Answer»

Solution :A group or a series of ORGANIC compounds each forms a HOMOLOGOUS series and the members of the series are called homologous.
(i) The members of a homologous series can be represented by general molecular formula.
(ii) The successive members differ from each other in molecular formula by a `-CH_(2)` UNIT.
(iii) All compounds of homologous series are CONTAIN same functional group.
(iv) The compounds of homologous series are MADE by general method and containing game geneal properties.
(v) The physical properties homologous series are successively change.
Discussion
33.

Value of R in SI units is

Answer»

`8.315 xx 10^7erg K^(-1) " mole"^(-1)`
`8.315 JK^(-1) "mole"^(-1)`
`0.0823 " lit.Atm K^(-1) "mole"^(-1)`
2 CAL `K^(-1) "mole"^(-1)`

Answer :B
Discussion
34.

Using your knowledge of electronegativity, tell whether each of the following bonds will be ionic. (a) H-H , b) O-CI c) Na-F , d) C-N , c) Cs - F , f) Zn CI

Answer»

Solution :(a) covalent (B) covalent (C) Ionic (d) Covalent(E) ionic(F) covalent
Discussion
35.

The type of hybrid orbitals used by chlorine atom in ClO_(3)^(-) is

Answer»

`sp^(3)`
`sp^(2)`
sp
none of these .

Solution :E.C. of Cl-atom in excited state
`1S^(2) 2s^(2) 2p^(6) 3s^(2)underset(sp^(3) "hybridisation")ubrace(3s^(2)3P_(x)^(1)P_(y)^(1)P_(Z)^(1) )3d ^(1) 3d^(1)`
STRUCTURE of `ClO_(3)^(-)` is
Discussion
36.

What is the significance of the terms-'isolated gaseous atom' and 'ground state' while defining the ionization enthalpy and electron gain enthalpy?

Answer»

SOLUTION : Isolated gaseous atom means that the atom should be FEE from other atom in the gaseous state.
No ENERGY should be required to SEPARATE it further from other atoms.
GROUND state means the lowest energy state possible for that atom. These terms are used for comparison purposes.
Discussion
37.

Which of the following species will have the largest and the smallest size Mg, Mg^(2+), Al, Al^(3+)?.

Answer»

Solution :Atomic radii decrease across a period. Cations are smaller than their parent atoms. AMONG isoelectronic ions, the one with the large positive nuclear charge will have a smaller radius.
Hence the largest species is Mg, the smallest one is `Al^(3+)`The SIZE of an ANION greater while that of the cation is smaller than that of its parent ATOM, e.g. `F^(-) = (1.36 Å) gt F (= 0.72 Å) , CL^(-) (=1.81 Å) gt Cl (=0.99 Å) , Na^(+) =(0.95 Å) lt Na (=1.90 Å) , Ca^(2+) (=0.99 Å) lt Ca(=1.97Å)`
Discussion
38.

What is green house effect?

Answer»

SOLUTION :Atmosphere traps the sun.s HEAT near the earth.s surface and keeps it warm. This is CALLED natural green house effect.
Discussion
39.

What type of cleavage occurs in a compound containing non polar covalent bond formed between atoms of similar electronegativity ?

Answer»

Homolytic CLEVAGE
Heterolytic clevage
Homelyfit FISSION
Heterolytic fission

SOLUTION :N/A
Discussion
40.

Which is wrong according to kinetic theory

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<P>Average K.E. of molecules is proportional to the ABSOLUTE temperature 
Collisions between molecules are perfectly elastic 
PRESSURE is DUE to collisions between molecules 
There are no ATTRACTIVE forces between the molecules of a gas 

Solution :P is due to collisions between molecules of gas with walls of container.
Discussion
41.

Which of the following represents the absolute mass of .Na. atom?

Answer»

23 gms
23 AMU
`23xx1.66xx10^(-24)gms`
`23xx1.66xx10^(-24)"amu"`

Solution :mass of 1 NA atom = 23 amu
Discussion
42.

Which of the following statements are not true about the following decomposition reaction? 2KCl_(3(s)) rarr 2KCl_((s)) +3O_(2(g))uarr

Answer»

Potassium is undergoing OXIDATION
Chlorine is undergoing oxidation
OXYGEN is REDUCED
None of the SPECIES are undergoing oxidation or reduction

Solution :`2Koverset(+5)(Cl)overset(-2)(O_3)rarr2overset(+1)(K)overset(-1)(Cl)+3overset(0)O_2`
All the statements are incorrect because it is a REDOX reaction in which chlorine is under-going reduction while oxygen is undergoing oxidation.
Discussion
43.

Which group-I element is differ from other elements of same group ?

Answer»

Be
MG
LI
CA

ANSWER :C
Discussion
44.

Write the structure of : (i) (E) penta-1,3-diene "" (ii) (2Z,4E)yhexa-2,4-diene (ii) (2E,4E)-3-ethylhexa-2,4-diene ""(iv) (R)-2-Bromopentane (v) (S)-3-bromo-3-chlorohexane "" (vi) (2S,3R)-2,3-dibromobutane

Answer»


ANSWER :`(##BSL_CHM_ISO_E01_160_A01##)`
Discussion
45.

Which of the following statements about ozone layer is true ?

Answer»

Ozone layer is beneficial to us because ozone CUTS out the ultraviolet radiation of the sun
The conversion of Ozone to oxygen is an endothermic reaction
Ozone is a triatomic linear molecule
Ozone layer is harmful as it cuts out radiation USEFUL for PHOTOSYNTHESIS

Answer :A
Discussion
46.

Which of the following is not correctly matched :

Answer»

LATICE acid `CH_3 - undersetoverset(|)(OH)(C )H - COOH`

Pivaldehyde `CH_3C(CH_3)_2CHO`

Answer :D
Discussion
47.

What feaction (n/N)of the lattice sites are vacent at 298 K for a crystal for which the energy required to make a defect is 1 eV ( 1 eV = 1.602 xx 10^(-19) J) ?

Answer»

Solution :If ` E_(v) , ` is the energy required to CREATE one vacant site, then by Boltzmann formula .
` n/N =e ^(-E _(v)//KT) `( k = Boltzmann constant =` R/N_(0)`
` or In n/N = - (E_(v))/(kT) `
` or log n/N = - ( E_(v))/(2.303 kT) = - ( 1.602 xx10^(-19))/(2.303( 8.314//6.023 XX 10^(23)) xx 298)`
` =- 0.00169185 xx 10^(4) = 16.9185= bar(17) . 0815`
`n/N = " Antilog" bar(17) .0815 = 1.206 xx 10^(-17)`
Discussion
48.

When a substance reacts with water, it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it produces the same gas B on warming but D can produces gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow color to a smokeless flame of Bunsen burner. A, B, C and D respectively are.....

Answer»

`Na,H_2,NAOH,Zn`
`K,H_2,KOH,Al`
`CA,H_2,Ca(OH)_2, Sn`
`CaC_2,C_2H_2, Ca(OH)_2, Fe`

ANSWER :A
Discussion
49.

Which of the following is true according to Charle.s Law ?

Answer»

Pressure - Volume
Pressure - Temperature
Volume - Temperature
Pressure - MOLE

ANSWER :C
Discussion
50.

What inferences do you observe by the values of Q and K_(C) ?

Answer»

Solution :If `Q=K_(C)`, the reaction is in EQUILIBRIUM STATE.
If `QgtK_(C)`, the reaction will PROCEED in the reverse direction i.e., formation of reactants.
If `QltK_(C)`, the reaction will proceed in the forward direction i.e., formation of PRODUCTS.
Discussion