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 of the followjng statements are incorrect ?

Answer»

0.2 moles of `KMnO_(4)` will oxide one mole of ferrous ions ferric ions in acidic MEDIUM.
1.5 moles of `KMnO_(4)` will oxidise 1 mole of ferrous OXALATE in acidic medium.
0.6 moles `KMnO_(4)` will oxidise 1 mole of ferrous oxalate to one mole of ferric ion and carbon dioxide in acidic medium.
1 mole of `K_(2)Cr_(2)O_(7)` will oxidise 2 moles of ferrous oxalate to ferric ions and carbon dioxide in acidic medium.

Answer :b
Discussion
2.

Describe the setting of plaster of Paris.

Answer»

monohydrate
orthorhombic GYPSUM
MONOCLINIC gypsum
DEAD BURNT plaster.

Solution :monoclinic gypsum
Discussion
3.

Which of the following statements about H_3BO_3 is not correct ?

Answer»

It is a strong tribasic acid.
It is prepared by ACIDIFYING an aqueous solution of borax.
It has a LAYER structure in which planar `BO_3` units are joined by hydrogen bonds.
It does not act as proton donor but acts as a Lewis acid by accepting a LONE pair of electrons.

Solution :`H_3BO_3` is a weak monobasic acid.
Discussion
4.

Which is (are) disproportionation reaction(s)?

Answer»

`2RCHOoverset("Al(OEt)"_3)rarrRCOOCH_2R`
`4H_(3)PO_3overset(DELTA)rarr3H_3PO_4+PH_3`
`PCl_(5)rarrPCl_(3)+Cl_(3)`
`RCHOoverset(KOH)rarr"RCOOK" +RCH_2OH`

SOLUTION : Disproportionation reactions are
`2RCHO overset(Al("OEt")_3)rarr RCOOCH_2R`
`4H_3PO_3 overset(Delta)rarr3H_(3)PO_(4)+PH_3`
`RCHO overset(KOH)rarrRCOOK + RCH_2OH`
In disproportionate reaction the same substance is simultaneously oxidised and reduced . While one atom of the substance acts as oxidant and ANOTHER atom of the substance acts as reductant.
Discussion
5.

Which of the relation of K_p and K_c at equilibrium in N_2O_(4(g)) hArr 2NO_(2(g)) ?

Answer»

`K_p=K_c`
`K_p LT K_c`
`K_p GT K_c`
`K_p/K_c=6`

ANSWER :C
Discussion
6.

Which ordering of compounds is accrding ot decreasing order of the oxidation state of nitrogen?

Answer»

`HNO_(3),NO,NH_(4)CL,N_(2)`
`HNO_(3),NO,N_(2),NH_(4)Cl`
`HNO_(3),NH_(4)Cl,NO,N_(2),`
`NO,HNO_(3),NH_(4)Cl,N_(2)`

Solution :`Hoverset(+5)(NO_(3)),overset(+2)(NO),overset(0)N_(2),overset(-3)NH_(4)Cl`
Discussion
7.

Which of the following statements are true ?

Answer»

Mercury poisoning causes a disease called minamata.
Quality water should he clear and turbidity should be LESS than 100 PPM.
The `F^(-)` ions make the enamel on teeth much harder.
Excessive lead cause TOXIC to heart.

Answer :A::B::C
Discussion
8.

What islight ?

Answer»

SOLUTION :Inearlierdayslightwassupposedtobe madeof particles in 19the centry
LIGTH isthe FORMOF radiationMaxwell wasagainthe firsttoreveal that ligh wavesareassociatedwithoscillating electricand magneticcharacter.
Discussion
9.

Which one of the following compounds shows the presence of intramolecular hydrogen bond ?

Answer»

`H_(2) O_(2)`
HCN
Cellulose
Concentrated acetic acid

Solution :`H_(2)O_(2)HCNand CH_(3) COOH` have only
intermolecular hydrogen bonding whereas
cellulose has intramolecular hydrogen BONDS
Discussion
10.

The surface tension of which of the following liquid is maximum

Answer»

`H_(2)O`
`C_(6)H_(6)`
`CH_(3)OH`
`C_(2)H_(5)OH`

ANSWER :A
Discussion
11.

What will happen to volume of a bubble of air found under water in a lake where temperature is 15^(@)C and the pressure is 1.5 atm, if the bubble rises to the surface where the temperature is 25^(@)C and the pressure is 1.0 atm?

Answer»

Its VOLUME will become greater by a factor of 2.5
Its volume will become greater by a factor of 1.6
Its volume will become greater by a factor of 1.1
Its volume will become SMALLER by a factor of 0.70

Solution :`(P_(1)V_(1))/(T_(1))=(P_(2)V_(2))/(T_(2))`
`(1.5"atm"xxV)/(288" K")=(1"atm"xxV_(2))/(298" K"):. V_(2)=1.6" V"`
Discussion
12.

Which of the following pairs is correctly matched ?

Answer»

`{:("EXPERIMENTAL","Phenomenon"),("X-ray spectra","CHARGE on the nucleus"):}`
`{:("Experimental","Phenomenon"),(alpha-"particle scattering","Quantized ELECTRON ORBIT"):}`
`{:("Experimental","Phenomenon"),("Emission spectra","Qunatization of energy"):}`
`{:("Experimental","Phenomenon"),("The photoelectric effect","The nuclear atom"):}`

Answer :C
Discussion
13.

The wavelength of line of sodium is 589.6 nm. Express it in Angstromunit.

Answer»


ANSWER :`5896 A`
Discussion
14.

What type of bonds are formed due to orbital overlap?

Answer»

Solution :`sigma`bond is due to HEAD on OVERLAP. `pi` bond is due to LATERAL, or sidewise overlap. Due to FACT that the extent of overlap in bond is GREATER than that in
Discussion
15.

The value of K_(c) = 4* 24 at 800 K for the reaction, CO (g) + H_(2)O (g) hArr CO_(2) (g) + H_(2) (g) Calculate equilibrium concentrations of CO_(2) , H_(2) , CO and H_(2) O " at 800 K, if only CO and " H_(2)Oare present initially at concentration of0*10 M each ?

Answer»

SOLUTION :` {:(,CO(G),+,H_(2)O(g),hArr,CO_(2)(g),+,H_(2)(g)),("Intial conc.",0*1 M,,0*1M,,,,),(" AT . eqm.",0*1-x,,0*1-x,,x,,x):}`
`K_(c) = ([CO_(2)][H_(2)])/([CO][H_(2)O]) :. 4* 24 = x^(2)/(0*1-x)^(2)`
or `x/(0*1 - x)= 2*06 or x = 2*06 (0*1-x) or x= 0*206 - 2*06 x or 3*06 x = 0*206 or x = 0*067`
`:. [CO_(2)]_(eq) = [H_(2)O]_(eq) = 0*067 M, [CO]_(eq) = [H_(2O] _(eq) = 0*1 - 0*067 = 0*033 M`
Discussion
16.

What do you mean by "inversion temperature" in different regions of the atmosphere ?

Answer»

SOLUTION :When we GO from one region of the atmosphere to the next adjoining region, the trend of temperature changes from increase to DECREASE or vice versa. This is CALLED inversion temperature.
Discussion
17.

To measure the quantity of MnCl_(2) dissolved in an aqueous solution, it was completely converted to KMnO_(4) using the reaction.

Answer»


Solution :The CHEMICAL equation involved in the conversion of `MnCl_(2) " to " KMnO_(4)` is :
`MnCl_(2) +K_(2)S_(2)O_(8)+H_(2)O to KMnO_(4)+H_(2)SO_(4)+HCl`
Balanced ionic equation will be :
`2Mn^(2+)+5S_(2)O_(8)^(2-)+8H_(2)O to 2MnO_(4)^(2-) +10SO_(4)^(2-)+16H^(+)`
Ionic equation involved in the oxidation of oxalic acid by `KMnO_(4)` in acid medium is :
`2MnO_(4)^(-)+6H^(+)+5{:(COO^(-),),(|,),(COO^(-),):}to2Mn^(2+)+8H_(2)O+10CO_(2)`
Number of moles of `MnCl_(2)=("Number of moles of oxalic acid")/(2.5)`
`=(0.225//90)/(2.5)=1xx10^(-3)`
Mass of `MnCl_(2)=0.001xx126g`
=0.126 g =126 mg
Discussion
18.

Which of the following pair is disteremoere?

Answer»




All of these

SOLUTION :N//A
Discussion
19.

Which of the following statement(s) is (are) correct ?

Answer»

The co-ordination number of each TYPE of ion in CsCl crystal is 8
A metal that crystallises in BCC structure has a co-ordination number of 12
A unit CELL of anioniccrystal shares some of itsion with other unit cells
The length of unit cell in NaCl is 552 pm. `(r_(Na^+)=95 "pm", r_(Cl^-)= 181 "pm")`

Solution : Co-ordination number of each ion in CsCl is 8.
A unit cell of an IONIC crystalshares some of its IONS with other unit cells.
Discussion
20.

whichof thefollowinghashighestmeltingand boilingpoint?

Answer»

BA
Sr
Mg
Be

Answer :D
Discussion
21.

What is anoxia or asphyxiation ?

Answer»

SOLUTION :Acute oxygen starvation in the BODY (due to CO poisoning) is called ANOXIA or ASPHYXIATION.
Discussion
22.

Which akyl groups can originate from propane ?

Answer»

SOLUTION :n-propyl and sec-propyl
Discussion
23.

Which of the following is very much volatile ?

Answer»

Diamond
Sodium chlorde
Calcium
Dry ice

Answer :D
Discussion
24.

Whichone of the following is a polynuclear aromatic hydrocarbon

Answer»

anthraceen
PHENOL
TOLUENE
NAPHTHALENE

ANSWER :a
Discussion
25.

What is the reason, why the degree of hydrolysis is not present in CH_3COONH_4 solution ?

Answer»

Solution :It is a salt of WEAK ACID `CH_3COOH` and weak base `NH_4OH` solution is neutral then
`h=sqrt((K_w/(K_a+K_b)))`
Discussion
26.

Which of the following arrangements represent increasing aoxidation number of the central atom?

Answer»

`CrO_(2)^(-),CIO_(3)^(-),CrO_(4)^(2-),MnO_(4)^(-)`
`CIO_(3)^(-),CIO_(4)^(2-),MnO_(4)^(-),CrO_(2)^(-)`
`CrO_(2)^(-),CIO_(3)^(-),MnO_(4)^(-),CIO_(3)^(-)`
`CrO_(2)^(2-),MnO_(4)^(-),CrO_(2)^(-),CIO_(3)^(-)`

Solution :`O.N of Cr "in" CrO_(2)^(-)=+3`
`O.N of CI "in" CIO_(3)^(-)=+5`
`O.N of Cr "in" CrO_(4)^(2)=6`
`O.N of MnO_(4)^(2)=+7`
Discussion
27.

Which of the following statement is not true about NaCl structure ?

Answer»

Each unit CELL CONTAINS 4 NACL MOLECULES
`Cl^(-)` ions has coordination number six
`Na^(+)` ions has coordination number four
`Cl^(-)` ions are in fcc arrangement

Solution :`Na^(+)` and `Cl^(-)` ions both have six coordination number.
Discussion
28.

Which of the following statements best explain the greater acidity of terminal alkynes (RC-=CH) compared with monosubstituted alkenes (RCH=CH_(2))?

Answer»

The sp-hybridized carbon atoms of the alkynes are LESS ELECTRONEGATIVE than the `sp^(2)` CARBONS of the alkene.
The TWO `pi` bonds of the alkyne are better able to STABILIZE th negative charge of the anion by resonance.
The sp-hybridized carbons of the alkyne are more electronegative than the `sp^2` carbon of the alkene.
The question is incorrect-alkenes are more acidic than alkynes.

Answer :C
Discussion
29.

Whatwould be theIUPACnamesand symbolsfor elementswithatomicnumbers 122, 127, 135 149and 150 ?

Answer»

Solution :FROMTHE Table3.6page`3//12` therootsfor 2, 7 , 5 , 9and oare biseptpentennand nilrespectively Thereforetheirnamesand symbolsare :
`{:(Z,," NAME ",," Symbol "),(122,,"Unbibium ",,UBB),(127,,"Unbiseptium ",,Ubs),(135,,"Untripentium ",,UTP),(149,,"Unquadennuium ",,Uqe),(150,,"Unpentnilium ",,Upn):}`
Discussion
30.

What is the value of Planck's constant in S.I units ?

Answer»

SOLUTION :`6.62 XX 10^(-34)JS`
Discussion
31.

Which carbocation is the most stable ?

Answer»




ANSWER :D
Discussion
32.

What is covalent bond ? Givesuitable examples to represent single , double and triple covalent bonds.

Answer»

Solution :The type of mutual sharing of one or more PAIRS of electrons between TWO combining ATOMS results in the formation of a chemical bond called a covalent bond. If two atoms SHARE just one pair of electron a single covalent bond is formed as in the case of hydrogen molecule . If two or THREE electron pairs are shared between the two combining atoms, then the covalent bond is called a double bond or a triple bond, respectively.
Discussion
33.

The standard conditions for G^0 are ____

Answer»

SOLUTION :1 ATM / 298 K
Discussion
34.

Total number of following reagents, which can be used to distinguish with visile change between SO_(2) and CO_(2) gases: FeCI_(3)-solution, Br_(2)-water, CI_(2)-wate, H_(2)O_(2), (KMnO_(4)+H_(2)SO_(4)), (strach-IO_(3)^(-)),(K_(2)Cr_(2)O_(7)+H_(2)SO_(4)),Ca(OH)_(2)

Answer»


SOLUTION :NONE have peroxy LINKAGES.
Discussion
35.

Which set of quantum numbers is possible for the last electron of Mg^(+) ion

Answer»

n=3,l=2,m=0,s=+1/2
n=2,l=3,m=0,s=+1/2
n=1,l=0,m=0,s=+1/2
n=3,l=0,m=0,s=+1/2

Answer :D
Discussion
36.

Which of the following molecule deviates from Octet rule with respect to central atom

Answer»

`SF_6`
`PCl_5`
`BrCl_5`
All

Solution :`BrCl_5, SF_6,PCl_5` have 10, 12, 10 electrons in the VALENCE shell of central ATOMS
Discussion
37.

Which of the following orbital overlapping is not possible according to VBT?

Answer»




All of these

Answer :D
Discussion
38.

Whichis / arecorrect statement?

Answer»

Insimplecubic closepackedarrangementno octahedralvoidis present at edgecentre.
In fcc unit celloctaherdralvoidandtetrahedralvoidare VACANT .
Packingfraction: simplecubiccell `LT` bcc unitcell `lt ` fcc unitcell.
Sizeof VOID: CUBIC`GT` octachedralvoid` gt`trtrahedralvoid.

Answer :A::B::C::D
Discussion
39.

What is heavy water ?

Answer»

`H_(2)^(18)O`
`H_(2)^(16)O`
`H_(2)O_(3)`
`D_(2)O`

ANSWER :D
Discussion
40.

The percentage of CH_(2)O in CuSO_(4)5H_(2)O is

Answer»

zero
about 28.7
about 50
about 40

Solution :`%Cu_(2)O=(143)/(500)xx100=28.6%`
Discussion
41.

When Cu rod is kept in AgNO_(3) solution, give redox reaction.

Answer»

SOLUTION :`Cu_((s))+2Ag_((aq))^(+)toCu_((aq))^(+2)+2Ag_((s))`
Discussion
42.

The source of energy of Red giant Stars, which are cooler than sun is

Answer»

Fission
Fusion
Burning of coal
Burning of gases.

Answer :B
Discussion
43.

Write which one out of O_(2)^(+)and O_(2)^(2-)is more stable on the basis of bond order calculations .

Answer»

Solution :Bondorder of `O_(2)^(+) = 2.5 `, BOND order of `O_(2)^(-)m = 1.5 . Hence, O_(2)^(+)` is more STABLE than `O_(2)^(-)` .
Discussion
44.

Write the lewis do structure for H_(2) and oxygen molecule.

Answer»

SOLUTION :`H_(2)` molecule.
HYDROGEN atom share one electron pair to acquire octet, then the BOND formed is a single COVALENT bond.
`H..HorH-H`
(b) `O_(2)` molecule
Oxygen atom share two electron paire to acquire octet then the bond formed is a double covalent bond.
`:overset(..)O::overset(..)O:or:overset(..)O=overset(..)O:`
Discussion
45.

What is meant by environmental pollution?

Answer»

Solution :Any undesirable change in our environment that have harmful effects on PLANTS, animals and human BEINGS is called ENVIRONMENTAL POLLUTION
Discussion
46.

What is the correct bond order for given electron configuration ? (sigma_(1s))^(2) (sigma_(1s))^(2) (sigma_(2s))^(2) (sigma_(2s)^(*))^(2) (sigma_(2p_(z)))^(1)

Answer»

0.5
1
0
1.5

Solution :0.5
Discussion
47.

The values of the van der Waals' constant a for some gases are given below. H_2 = 0.245 " atm " L^2 mol^(-2) O_2 = 1.360 " atm " L^2 mol^(-2) CO_2 = 3.590 " atm " L^2 mol^(-2) NH_3 = 4.170 " atm " L^2 mol^(-2) Arrange these gases in the decreasing order of their liquefaction tendencies.

Answer»

SOLUTION :`NH_3 GT CO_2 gt O_2 gt H_2`
Discussion
48.

Under hydrolytic condition, the compounds used for preparation of linearpolymerand forchaingterminationrespectively are

Answer»

`CH_(3)SiCl_(3)` and `Si(CH_(3))_(4)`
`(CH_(3))_(2)SiCl_(2)` and `(CH_(3))_(3)SICL`
`(CH_(3))_(2)SiCl_(2)` and`CH_(3)SiCl_(3)`
`SiCl_(4)` and `(CH_(3))_(3)SiCl`

Solution :`(CH_(3))_(2)SiCl_(2)` for linear polymerizationand `(CH_(3))_(3)SiCl` for chaintermination.
Discussion
49.

Which among the following is a Pseudoalum

Answer»

`(NH_(4))_(2) SO_(4).Fe_(2)(SO_(4))_(3).24H_(2)O`
`MgSO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`
`K_(2)SO_(4).Cr_(2)(SO_(4))_(3).24H_(2)O`
`Na_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`

Answer :B
Discussion
50.

The test used for identifying carbon-carbon double fond in an alkene is

Answer»

Baeyer
Carbylamine
LASSAIGNE
SILVER mirror

Answer :A
Discussion