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.

Which among the followings shows maximum oxidation state ?

Answer»

V
FE
Mn
Cr

Solution :`OVERSET(+7)(KMnO_4)`
Discussion
2.

underset(("Hydrated salt"))((A))underset("heated")overset("Strongly")rarr ubrace(B+C)_("Transparent glassy bead") H_(2)BO_(3) overset("Strongly")underset("heated")rarr C+D Find the number of water of crystallization in (A):

Answer»

4
5
10
24

Answer :C
Discussion
3.

What are thermochemical equation ?

Answer»

Solution :A thermochemical EQUATION is a balanced STOICHIOMETRIC chemical equation that includes the ENTHALPY CHANGE `(DeltaH)`.
Discussion
4.

The saponification number of fat or oil is defined as the number of mg of KOH required to saponify 1 g oil or fat. A sample of peanut oil weighing 1.5763 g is added to 25 mL of 0.421 M KOH. After saponification is complete, 8.46 mL of 0.2732 M K_(2)SO_(4) is needed to neutralise excess of KOH. What is the saponification number of peanut oil ?

Answer»


SOLUTION :N//A
Discussion
5.

What is Hunsdiccker reaction?

Answer»

SOLUTION :SILVER salts of fatty acids when refluxed with BROMINE in `C Cl_(4)` gives bromo ALKANE.
.
Discussion
6.

Toughenedbearings are madeusing____ alloy

Answer»

`Na-PB`
`LI -pb`
`Li-Al`
`Li -MG`

ANSWER :B
Discussion
7.

Which of the following is an element present in the d-block, but not a transition element?

Answer»

Cd
Cu
Ca
Cr

Answer :A
Discussion
8.

Why alkali metals exhibit +1 oxidation state only in their compounds?

Answer»

Solution :UNIPOSITIVE ions of alkali metals POSSESS stable inert gas ELECTRONIC configuration. Thus second ionisation potential of alkali metal is very high and they exhibit `+1` oxidation STATE only in their compounds.
Discussion
9.

What are carbocations?

Answer»

Solution :(i) Let us CONSIDER the hetrolytic fission of the bond C-X present in organic molecule. If the ATOM X has greater ELECTRONEGATIVITY than the carbon atom, the former takes away the bonding electron pair and becomes negatively charged while the carbon will lose its electron and thus acquire a positive charge.
(ii) Such a cationic species CARRYING a positive charge on carbon are known as carbocation orcarbonium ion.
Discussion
10.

The structure of isoburtyl group in an organic compound is :

Answer»

`{:(""CH_(3)),("|"),(CH_(3)-C-),("|"):}`

`CH_(3)-OVERSET(CH_(3))overset(|)(CH)-CH_(2)-CH_(3)`
`CH_(3)-CH_(2)-CH_(2)-CH_(2)-`

SOLUTION :It is the correct
Discussion
11.

Which of the following elements will have the highest electronegativity ?

Answer»

CHLORINE
Nitrogen
Cesium
FLUORINE

ANSWER :d
Discussion
12.

Which of the following does not exist ?

Answer»

`SiCl_(6)^(2-)`
`SiF_(6)^(2-)`
`GeF_(6)^(2-)`
`PbF_(6)^(2-)`

Answer :A
Discussion
13.

The value of Rydberg constant is

Answer»

`109677 CM^(-1)`
`109700 cm^(-1)`
`10968 cm^(-1)`
10970 m

Answer :A
Discussion
14.

Which of the following halides undergoes hydrolysis on warming with "water" // "aqueous" NaOH?

Answer»




Solution :The PRESENCE of electron WITHDRAWING groups LIKE `-NO_(2)` at o- and p-positions increase the REACTIVITY of chlorobenzene. Larger the number of such groups at o- and p-positions w.r.t. halogen, more reactive is the HALOARENE.
Discussion
15.

Write the resonance structure of CO_2 .

Answer»


Discussion
16.

Very slight decrease in atomic radius occurs in a transition series when compared with that in representative series. This is due to

Answer»

Shielding effect
PENETRATING effect
COMPTON effect
Inert pair effect

ANSWER :A
Discussion
17.

Which of the following os the incorrect name of CH_(3)NC?

Answer»

(1) Methyl ISOCYANIDE
(2) Acetoisonitrile
(3) Methyl carbylamine
(4)Methyl isonitrile

Solution :`CH_(3)NC` on hydrolysis does not give acetic acid, thus, acetoisonitrile is the INCORRECT name.
`CH_(3)NCoverset(H_(2)O)rarrCH_(3)NH_(2)+underset("Formic acid")(HCOOH)`
Discussion
18.

Write the position isomers of diethyl ether. Write their structures and IUPAC names. Can these be also regarded as metamers ?

Answer»

Solution :Two position isomers (I and II) are possible of diethyl ether.
`underset("Diethyl ether")(CH_(3)CH_(2)-O-CH_(2)CH_(3)) "" underset("1-Methoxypropane")(CH_(3)O-CH_(2)CH_(2)CH_(3))``{:(""CH_(3)),("|"),(CH_(3)O-CH-CH_(3)),("2-Methoxypropane (II)"):}`
Both these can ALSO be regarded as METAMERS of diethyl ether because these differ in the number of carbon ATOMS on either side of the ethereal OXYGEN.
Discussion
19.

The wavelength of m^(th) line balmer series for an orbital is 4103Å. What is the value of m?

Answer»


SOLUTION :For the `4^(TH)` spectral line of Balmer SERIES in H-spectrum, the wave length in `4103 A^0` .
Discussion
20.

What is the value of DeltaG fora spontaneous process?

Answer»


ANSWER :`DELTAG=` VESponstaneous.
Discussion
21.

What is the volume strength of 100 ml of aqueous H_2O_2 solution containing 34 gm of H_2O_2

Answer»

`5.6` VOL
`11.2` vol
`22.4` vol
100 vol

ANSWER :B
Discussion
22.

Which of the following compound is known as oil of wintergreen ?

Answer»

<P>METHYL SALICYLATE
Phenyl salicylic
Ethyl salicylate
Ethyl, `p-`hydroxybenzoate

Solution :Methyl salicylate
Discussion
23.

Which one of the following sets of ions represents a collection of isoelectronic species?

Answer»

`Ba^(+2), Sr^(+2), K^(+), CA^(+2)`
`N^(-3), O^(-2), F^(-1), S^(-2)`
`Li^(+), NA^(+), Mg^(+2), Ca^(+2)`
`K^(+), CL^(-1), Ca^(+2), Sc^(+3)`

Answer :d
Discussion
24.

Which of the following is water soluble compound of calcium ?

Answer»

`Ca(HCO_(3))_(2)`
`CaSiO_(3)`
`CaCO_(3)`
`Ca(OH)_(2)`

Answer :A
Discussion
25.

When BeCl_(2) is hydrolysed, white fumes of gas are given out. The intensity of fumesintensifies when a rod dipped in moist ammonia is brought near the mouth of the test tube. The gas which comes out during hydrolysis is

Answer»

`Cl_(2)`
`HCl`
`NH_(4)OH`
`NH_(4)CL`

Solution :`BeCl_(2)+2H_(2)O to Be(OH)_(2)+ UNDERSET(("fumes"))(2HCl)HCl+NH_(3) to underset(("INTENSE fumes"))(NH_(4)Cl)`
Discussion
26.

Which of th following is not true about the voids formed in 3 dimensional hexagonal close packed structure ?

Answer»

A tetrahdral void is formed when a SPHERE of the second layer is present above trinaglar void in the first layer.
All the triangular voids arenot COVERED by the SPHERES of the second layer.
Tetrahedral voids are formed when the traingular voids in the seconds layer lie above the triangular shapes of these boids do not overlap.
Octadrdral obids are fomed when the traingular voids in the second later exactly overlap with similar voids in the first layer.

Solution :is not TURE because octahedral voids are formed when triangular voids in the second layer lie the triangular voids of the first layer.
(d)is not true because octadedral void is combination of TWO trianglar voids one with vertex upward and the other with vertex downward and not their overlap.
Discussion
27.

Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride.

Answer»

Aniline
Phenol and acetaldehyde
Anisole
Nitrobenzene

Solution :N//A
Discussion
28.

The reducing power of a metal depends on various factors . Suggest the factor which makes Li, the strongest reducing agent in aqueous solution .

Answer»

SUBLIMATION enthalpy
Ionisation enthalpy
Hydration enthalpy
Electron GAIN enthalpy

Solution :Due to SMALL size of the`LI^(+)` , its hydration enthalpy is the highest and hence Li is the strongest reducing agent .
Discussion
29.

What is solubility of salt?Explain classification of salt based on solubility ?

Answer»

SOLUTION :Each salt has its own CHARACTERISTICS . The no. of MOLES of SOLUTE disslove in 1 lit. at definite TEMPERATURE is called solubility of salt.
Discussion
30.

The species with largest ionisation potential

Answer»

`LI^(+)`
`MG^(+)`
`AL^(+)`
`NE`

ANSWER :A
Discussion
31.

Which one of the following is paramagnetic and having 0.5 bond order ?

Answer»

`O_(2)^(-)`
`N_(2)`
`F_(2)`
`H_(2)^(+)`

SOLUTION :`H_(2)^(+)`
Discussion
32.

Which of thefollowingconfiguration representsatom of theelement havingthe highestsecondionizationpotential ?

Answer»

` 1s^(2)2 s^(2)2p^(4)`
`1 s^(2)2S^(2)2p^(6)`
`1 s^(2)2s^(2)2p^(6)3S^(1)`
`1s^(2)2s^(2)2p^(6)3s^(2)`

Solution :Element whichhas oneelectron in thevalenceshellhas highestsecondionizationenergybecause inthiscase 2ndelectronhas to belost FROMTHE INERTGAS core . Thusoption ( c) iscorrect.
Discussion
33.

Two elements 'A' and 'B' (atomic weights 75 and 16 respectively) combine to give a compound having 75.8% of 'A'. The compound has the formula (St. John's)

Answer»

XY
`X_(2)Y`
`X_(2)Y_(2)`
`X_(2)Y_(3)`

ANSWER :D
Discussion
34.

Which one of the following hexachlorocyclohexane is least reactive and which one is most reactive for E2 reaction with a strong base for dehydrohalogenation.

Answer»

I LEAST & II least
II least& I most
III least & I most
III least & II most

SOLUTION :
Discussion
35.

Which statement is correct about photochemical bromination of Butane? CH_(3)-CH_(2)-CH_(2)-CH_(3)overset(Br_(2).hupsilon)to

Answer»

1-Bromobutane and 2-Bromobutanes are formed in equal amounts
2-Bromobutane is formed with fater RATE than 2-chlorobutane in the other experiment of chlorination
The major product is a equimolar mixture of two compounds.
HOMOLYSIS of C-H bond has LOWER activation energy than homolysis of Br-Br bond.

Answer :C
Discussion
36.

What is the formula mass of gypsum?

Answer»

SOLUTION :Formula of GYPSUM is `CaSO_(4)2H_(2)O`
Formula mass of `CaSO_(4)2H_(2)O`=`(6xx12u)+(12xx1u)+(6xx16u)=180u`.
Discussion
37.

Which of the following optionswill have compressibility factor greater than 1?

Answer»

`H_(2)` gas at its CRITICAL condition.
`CH_(4)` gas at room temperature and LOW pressure.
`N_(2)` gas at BOYLE's temperature and low pressure.
He gas at normal temperature and normal pressure.

Answer :d
Discussion
38.

Which of the following orbitals will have zero probability of finding the electron in the pz plane

Answer»

px
py
pz
dyz

Answer :A
Discussion
39.

Which of the following compounds of Be has polymeric structure

Answer»

`BeH_(2)`
`BeCl_(2)`
`Be(OH)_(2)`
`Be(NO_(3))_(2)`

SOLUTION :`BeH_(2)` and `BeCl_(2)` exits as POLYMER with three CENTRED two electron bonds.
Discussion
40.

Which of the following statements are not true for hydrogen ?

Answer»

It exists as DIATOMIC molecule
It has one electron in the outermost shell
It can lose an electron to form a CATION which can FREELY exist
It forms a large number of ionic compounds by losing an electron.

Solution :`H^+`is never remain free because its always in small size so it EASILY combine with any atom or MOLECULES. It is easily form oxide, halides and sulphide like alkali metal but its high ionisation enthalpy its not contain metallic character in normal case.
Discussion
41.

When the bond form according to VB theory ?

Answer»

SOLUTION :If the ORBITALS of TWO atoms arrange an INTERNUCLEAR axes and overlap then covalent bond is form.
Discussion
42.

The correct increasing order of densities of alkali metals is :

Answer»

`LI lt K lt Na lt Rb`
`Li lt Na lt K lt Rb`
`Li lt Na lt K lt Rb`
`Li lt Na lt K lt Rb`

ANSWER :A
Discussion
43.

Writethe chemical equations for comubstionof propane

Answer»

Solution :Chemicalequationforcombustionof propane:Thegeneralcombustion reactionfor anyalkaneis
`C_(n) H_(2n)+2 + ((3n+1)/( 2)) O_(2)to nCO_(2)+ (n+1)H_(2)O`
`CH_(3) -CH_(2)-CH_(3) + 5O_(2)to 3CO_(2) + 4H_(2) O`
`Delta H^(@) =- 101.6 kj`
Discussion
44.

Which one of the following compounds can be deprotonated by OH fastest ?

Answer»

`HCOOH, pK_(a)=3.8`
`H_(2)S, pK_(a)=7.0`
Toluence , `pK_(a)` =41
`CH_(3)NH_(2), pK_(a)=40`

Answer :A
Discussion
45.

Which one of the following is not a path function

Answer»

Work
Heat
Pressure
Either (a) or (B)

ANSWER :C
Discussion
46.

Which elements having more positive and more negative electron gain enthalpy?

Answer»

SOLUTION :ELEMENTS of noble gas having more POSITIVE and elements of halogens having more negative electron gain enthalpy.
Discussion
47.

What happens when a. Sodium metal is dropped in water? b. Sodium metal is heated in free supply of air? c. Sodium peroxide dissolves in water?

Answer»

Solution :(i) `H_(2)` gas is evolved which catches FIRE due to the exothermicity of the reaction .
`2 Na (s) + 2 H_(2)O (l) to 2 NaOH (aq) + H_(2) (g)`
(ii) `Na_(2)O_(2)` along with a small amount of `Na_(2)O` is formed .
`2 Na(s) + O_(2)(g) to 2 UNDERSET("(minor)") (2 Na_(2)O(s))`
`Na_(2)O(s)+ (1)/(2) O_(2) (s) to underset("(major)")(Na_(2)O_(2)(s))`
(III) `H_(2)O_(2)` is formed
`Na_(2)O_(2) (s) + 2H_(2)O (l) to 2 NaOH (aq) + H_(2)O_(2) (l)`
Discussion
48.

Which d-orbital does not have four lobes and what is its shape called ?

Answer»

SOLUTION :`d_(Z)^(2)` which has dough-nut SHAPE.
Discussion
49.

Which of the S-block element doesn't react with water.

Answer»

K
Na
Be
Ca

Solution :The intences of beryllium towards `H_(2)O` is due to the formation of thin FILM of oxide LAYER on its surface.
Discussion
50.

What are the values of w and DeltaE, when a system absorbs 250Jof heat by expanding from 1 lit to 10 lit against 0.5 atm pressure and at constant temperature.

Answer»

Solution :`W=-P Delta v =- 0.5 (10 -1) =- 4.5 `lit - atm
WOrk DONE, `w =- 4.5 XX 101 J =- 454 .5 J.`
`Delta E =q - w = 250 -454.5 =-204 .5 J.`
Discussion