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.

In which of the compounds, the oxidation state of hydrogen is -1

Answer»

`H_2O`
`CaH_2`
`HBR`
`H_2S`

ANSWER :B
Discussion
2.

In which of the following reaction 3^(@) alcohol will be obtained as a product ?

Answer»

MGBR(EXCESS)+`H-overset(O)overset(||)C-Clrarrunderset(H^(+))RARR`
PhMgBr(excess)+`CH_(3)-overset(O)overset(||)C-Clrarrunderset(H^(+))rarr`
`CH_(3)MgBr("excess")+CH_(3)-overset(O)overset(||)C-O-overset(O)overset(||)C-CH_(3)rarrunderset(H^(+))rarr`
`CH_(3)MgBr("excess")+CL-overset(O)overset(||)C-O-Etrarrunderset(H^(+))rarr`

Solution :N//A
Discussion
3.

In which of the compounds given below is there more than one kind of hybridisation (sp,sp^(2),sp^(3)) for carbon ? (i) CH_(3)CH_(2)CH_(2)CH_(3) (ii) CH_(3)-CH=CH-CH_(3) (iii) CH_(2)=CH-CH_(2)-CH_(3) (iv) H-C-=C-H.

Answer»

(ii)
(III) and (IV)
(i) and (iv)
(ii) and (iii)

Solution :(i) `CH_(3)CH_(2)CH_(2)CH_(3)"(all "SP^(3)" C atoms)"`
(ii) `CH_(3)-CH=CH-CH_(3)"("sp^(3)" and "sp^(2)" C atoms)"`
(iii) `CH_(2)=CH-CH_(2)(sp^(2) " and "sp^(3)" C atoms")`
(iv) `HC-=C-H" (all sp C atoms)"`
Correct answer (D) : (ii) and (iii)
Discussion
4.

In which of the following reaction alcohol is not formed-

Answer»

`R-CH=CH_(2)+H_(2)OUNDERSET("high pr".)OVERSET(H^(+))to`
`R-COCl+2H_(2)overset(LiAlH_(4))to`
`(R-CO)_(2)O+4H_(2)+4H_(2)overset(LiAlH_(4))to`
`R-CH_(2)-CH_(3)+H_(2)Ounderset("High pr")overset(H^(+))to`

ANSWER :D
Discussion
5.

In which of the following properties may enantiomers differ?

Answer»

Refractive index
Odour
Solubility
Melting POINT

Solution :Chiral molecules can SHOW their different handedness in many ways, including the way they affect human beings. One enantiomeric form of a compound called LIMONENE is primarily responsible for the oror of oranges and the other ENANTIOMER for the odour of lemons. One enantiomer of a compound called carvone is the essence of caraway and the other essence of SPEARMINT.
Discussion
6.

In which of the above reactions does the rate fo SN^(2) reactionsdecreases with an increases in solvent polarity?

Answer»

`(I)`
`(II)`
`(III)`
`(IV)`

SOLUTION :If the recatant and/or nucleophilic are changed, increasing the POLARITY of the solvent stablises any charged GROUND STATE speicesand decreases the RATE of `SN^(2)` reaction with an increase with the increases in polaityof the solvent.
Discussion
7.

In which of thc following pairs are both the ions coloured in aqueous solution ? (At no: Sc=21, Ti=22, Ni=28, Cu=29, Co=27)

Answer»

`Ni^(2+),Cu^(+)`
`Ni^(2+),TI^(3+)`
`SC^(3+),Ti^(3+)`
`Sc^(3+),CO^(2+)`

ANSWER :B
Discussion
8.

In which of following reactions, electrophilic aromatic substitution take place on left hand side phenyl ring?

Answer»




ANSWER :B::C
Discussion
9.

In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic ?

Answer»

`NO to NO^(+)`
`N_(2) to N_(2)^(+)`
`O_(2) to O_(2)^(2-)`
`O_(2) to O_(2)^(+)`

Solution :Magentic NATURE
`NOrarrNO^(+)B.O rArr 2.5 rarr3"Paramagnetic "rarr"DIAMAGNETIC"`
`{:(N_(2)rarrN_(2)^(+)"B.O."rArr3rarr2.5),(O_(2)rarrO_(2)^(2-)"B.O."2rarr1):}]B.O.darr`
`O_(2)rarrO_(2)^(+)"B.O."2rarr2.5"Paramagnetic"rarr"Paramagnetic"`
`"So,"NOrarrNO^(+)` is CORRECT answer
Discussion
10.

In which of following, NH_(3) is not used?

Answer»

NESSLER's REAGNET
Reagent for the ANALYSIS of IV group basic radical
Reagent for the analysis of III group basic radical
Tollen's reagent

Solution :Nessler.s reagnet
Discussion
11.

In which of the following products are in the molte state

Answer»

Calcination
Oxidizing ROASTING
Sulphatizing routing
Smelting

ANSWER :D
Discussion
12.

In which of following sets the carbohydrates are reducing sugar

Answer»

glucose , FRUCTOSE , SUCROSE ,
maltose , LACTOSE , sucrose
cellulose , sucrose , STARCH
maltose , lactose , fructose

Answer :D
Discussion
13.

In which of the following processes, fused sodium hydroxide is electrolysed at 330^(@)C temperature for extraction of sodium

Answer»

Castner's process
Down's process
Cyanide process
Carbon MONOXIDE

Solution :Castner's process USED to obtain Na, by electrolysis of SODIUM hydroxide.
Discussion
14.

In which of following is incorrect

Answer»

Q-2-iv
R-3-iv
P-4-iii
R-1-ii

Answer :C
Discussion
15.

In which of the following processes, electrical energy is converted to chemical energy?

Answer»

PURIFICATION of metals
Generation of gases
Electroplating
All of the above

Answer :D
Discussion
16.

In which of the following process(es) hybridisation of underlined atom does not change?

Answer»

`ul(N)H_(3)+BF_(3)rarrH_(3)N.BF_(3)`
`ul(Si)F_(4)+2F^(-)rarr[SiF_(6)]^(2-)`

`H_(3)ul(B)O_(3)OVERSET(OH^(-))rarr[B(OH)_(4)]^(-)`

Solution :`underset(sp^(3))(ul(Si)F_(4))rarrunderset(sp^(3)d^(2))(ul(Si)F_(6)^(2-))`
Discussion
17.

In which of following first is more acidic than second

Answer»

<P>`N_(2)O_(3) gt N_(2)O_(5)`
`Bi_(2)O_(5) gt Bi_(2)O_(3)`
`P_(2)O_(3) gt P_(2)O_(5)`
`Sb_(2)O_(3) gt Sb_(2)O_(5)`

ANSWER :B
Discussion
18.

In which of the following processes is autocatalysis involved?

Answer»

Oxidation of `FeSO_(4)` with acidified `KMnO_(4)`
COMBUSTION of CO to `CO_(2)`
Oxidation of `FeCl_(3)` to `FE(OH)_(3)`
Conversion of alkanes to alkenes.

Solution :`10 FeSO_(4) + 2KMnO_(4) +8H_(2)SO_(4) to 5Fe_(2) (SO_(4))_(3)+K_(2)SO_(4)+ 2MnSO_(4) + 8H_(2)O`
In this reaction, MnSO4 acts as an autocatalyst.
Discussion
19.

In which of following compound a ppi - dpi bonding is present

Answer»

TRISILYLAMINE
GRAPHITE
Dimethyl AMINE
DIAMOND

ANSWER :A
Discussion
20.

In which of the following processes nitorgen is oxidised ?

Answer»

`NH_4^+ rarrN_2`
`NO_3^- RARR NO`
`NO_2 rarr NO_2^-`
`NO_3 rarrNH_4^+`

ANSWER :A
Discussion
21.

In which of the following coordination entities the magnitude of Delta_(0) (CFSE In octahedral field) will be maximum (at. no. Co=27)?

Answer»

`[Co(CN)_(6)]^(3-)`
`[Co(C_(2)O_(4))_(3)]^(3-)`
`[Co(H_(2)O)_(6)]^(3+)`
`[Co(NH_(3))_(6)]^(2+)`

Solution :`CN^(-)rarr "STRONG field ligand"`
Discussion
22.

In which of the following process, weaking of covalent bond take place :-

Answer»

Boiling of `H_(2)O`
Melting of KCN
Boiling of `CF_(4)`
Melting of `SiO_(2)`

Answer :D
Discussion
23.

In which of following ces calcination process is not appliable

Answer»

`CaCO_(3)`
`Al_(2)O_(3)2H_(2)O`
`CuCO_(3).CU(OH)_(2)`
`ZnS`

Solution :CALCINATION is the process generally USED for Carbonate and hydrated ORES like `CaO_(3),Al_(2)O_(3).2H_(2)O and CuCO_(3).Cu(OH)_(2)`
Discussion
24.

In which of the following processes, calcium silicate slag is formed. Extraction of

Answer»

Tin from casierile
Copper from copper pyrite
Zinc from Zinc blende
IRON from hematite

Solution :CALCIUM silicate `(CaSiO_(3))` slag is formed during the extraction of Tin (Sn) from cassiterite and Iron (Fe) from HAEMATITE.
Discussion
25.

In which o the following bond angle around the central atom is maximum ?

Answer»

`NH_3`
`NH_4^+`
`PCl_3`
`SCl_2`

ANSWER :B
Discussion
26.

In which of the following process energy is liberated ?

Answer»

`O^(-) + e to O^(2-)`
`HCl to H^(+) + CL^(-)`
`Cl + e to Cl^(-1)`
`Cl to Cl^(+) + e`

Answer :C
Discussion
27.

In which molecule does the chlorine have the most positive partial charge?

Answer»

`HCl`
`BrCl`
`OCl_(2)`
`SCl_(2)`

SOLUTION :
Discussion
28.

In whichof the following preparations of ether. The configuration about chiral centre is not reatined ?

Answer»



`CH_3underset(OBU)UNDERSET(|)"CH"-underset(CL)underset(|)CHCH_3`

SOLUTION :
Discussion
29.

In which molecule, cleavage by HIO_(4) is not observed?

Answer»




ANSWER :A
Discussion
30.

In which mode of expression, the concentration of solution remains independent of temperature ?

Answer»

Molarity
Normality
Formality
Molality

Solution :SINCE in the expression of molality, we take MOLES of SOLUTE per `1000G` of solvent and the mass is independent of TEMPERATURE
Discussion
31.

In which of the following porcentage of carboni inimum

Answer»

PIG IRON
CAST iron
WROUGHT iron
Pig iron and wrough iron

Answer :A
Discussion
32.

which of the following mode of expressing the concentration is independent of temperature?

Answer»

Molarity
Normality
Formality
molality

Answer :D
Discussion
33.

In which of the following process acetone is one of the final products ?

Answer»

Ozonolysis of ETHYNE
OXIDATION of 2-butene with `KMnO_(4)//H^(+)`
Oxidation followed by HYDROLYSIS of cumene
Dehydrogenation of 1-propanol

Answer :C
Discussion
34.

In which mode of expression the concentration of solution remains independent of temperature ??

Answer»

Normality
Formality
Mole fraction
Molarity

ANSWER :C
Discussion
35.

In which of the following process, a maximum increase in entropy is observed?

Answer»

Melting of ice
Sublimation of naphthalene
Condensation of water
Dissolution of SALT in water

Solution :Sublimation of naphthalene `RIGHTARROW` As sublimation INVOLVES the conversion of solid into gaseous state directly.Therefore there is a larger/maximum increase in entropy as the HIGHLY ordered solid goes to highly (most) disordered gaseous state.Therefore `DeltaS ` = maximu for the sublimation of naphthalene.
Discussion
36.

In which metal vessels aqueous CuSO_(4) solution can be store ? E_(Cu^(2+)//Cu)^(@)=0.34V E_(Fe//Fe^(2))^(@)=0.44V, E_(Al//Al^(3+))^(@)=1.66V E_(Ni//Ni^(2+))^(@)=0.25V,E_(Ag^(+)//Ag)^(@)=0.80V

Answer»

Ag
Ni
Fe
Al

Solution :`E_(Cu^(2+)|Cu)^(THETA)=0.34V`
`E_(Al|Al^(3+))^(Theta)=1.66V and E_(Al^(3+)|Al)^(Theta)=-1.66V`
So, in Al VESSELS, `Cu^(2+)` of `CuSO_(4)` is REACTED.
`2Al_((S))+3Cu^(2+) to 2Al^(3+)+3Cu_((S))`
So reaction of `CuSO_(4)` is occurred with Al vessels so `CuSO_(4)` solution can.t be STORE in Al.
Discussion
37.

In which lathanide contraction is seen?

Answer»

Gd
Au
Np
At

Answer :A
Discussion
38.

In which of the following polymers ethylene glycol is one of the monomer units?

Answer»


`(-CH_(2) - CH_(2)-)_(N)`

`(-O-underset(CH_(3))underset(|)(CH) - CH_(2) - underset(O)underset(||)(C) - O-underset(CH_(2)CH_(3))underset(|)(CH) - CH_(2) - underset(O)underset(||)(C) - )_(n)`

Answer :A
Discussion
39.

In which kind of solids dipole-dipole forces are present?

Answer»

POLAR MOLECULAR Solids
Ionic Solids
Hydrogen Bonded
All of the above

Answer :A
Discussion
40.

In which is chlorine not used:

Answer»

As germicide
As oxidant
As CUTTING tool
As disinfectant

Answer :C
Discussion
41.

In which iron has the lowest oxidation state ?

Answer»

`FE(CO)_5`
`Fe_2O`
`K_4Fe(CN)_6`
`FeSO_4(NH_4)_2SO_4 6H_2O`

Answer :A
Discussion
42.

In which of the following polymers ethylene gylcol is one of the monomer units?

Answer»


`-(CH_2-CH_2)_n-`

ANSWER :A
Discussion
43.

In which hybridisation, resulting all orbitals are NOT equivalent-

Answer»

`sp^(3)`
`sp^(3)d`
`sp^(3)d^(2)`
`sp^(2)`

SOLUTION :All BOND length in `sp^(3)d` HYBRIDISATION are not same.
Discussion
44.

In which following statement are correct. (a) Anhydrous hydrogen fluroide is a liquid at ordianry temperature while other halogen acid are gases. (b) Lead acetate does not form any precipitate with HF acid but other halogen acid from precipitates. (c) HF is heated with a mixture of MnO_2 and H_2SO_4, no gas is evolved but In case of HCI, HBr and HI acids evolved gases. (d) HF is not oxidised by strong oxidising agent but other halogen acid are oxidised.

Answer»

(A) a
(B) b
(C) c
d

Answer :A::C::D
Discussion
45.

In which fo the following reactions is the correct major product formed?

Answer»

<P>


SOLUTION :Product (d) is wrong, `Br_(2)` in non-plor solvent and gives `o-` and `p-` PRODUCTS.
Discussion
46.

In which of the following polymers ethylene glycol is one of the monomer units ?

Answer»


`(--CH_(2)-C_(2)--)_(n)`

`(--O-underset(CH_(3))underset("|")"CH"-CH_(2)-underset(O)underset(||)C-O-underset(CH_(2)CH_(3))underset("|")"CH "-CH_(2)-underset(O)underset(||)C--)_(n)`

SOLUTION :Given polymer can be OBTAINED CONDENSATION polymerization of ethylene glycol and phthalic ACID with the elimination of water molecule.
Discussion
47.

In which of the following polymers , ethylene glycol is one of the monomer units ?

Answer»




Solution :MONOMERS of glyptal, i.e., option (a) are ETHYLENE glycol and PHTHALIC ACID.
Discussion
48.

In which of the following polymers ethylene glycol is one of the monomer units-

Answer»


`[--CH_2-CH_2--]_n`

`[--O-underset(CH_3)underset|CH-CH_2-undersetundersetO(||)C-O-underset(""CH_2CH_3)underset|CH-CH_2-undersetOunderset(||)C--]_n`

ANSWER :A
Discussion
49.

In which form of complex, the plationum is dissolved in aqua regia ?

Answer»

`[Pt(NO_(3))_(2)Cl_(2)]`
`[PtCl_(6)]^(2-)`
`[Pt(NO_(3))Cl_(5)]^(2-)`
`[PtCl_(4)]^(2-)`

ANSWER :B
Discussion
50.

In which ofthe following polymerisation newbonds are formed by the elimination of small molecules ?

Answer»

CONDENSATION
ADDITION
SIMPLE
COORDINATION

ANSWER :A
Discussion