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 following orders correctly depicts the decreasing order of stability of carbanion?

Answer»


`OHC-underset(CHO)underset(|)overline(C)-CHO gt OHC- overline(C)H-CHO gt H_(3)C- underset(O)underset(||)(C)-overline(C)H-underset(O)underset(||)(C)-CH_(3) gt overline(C)H_(3)-CHO`
`overline(C)H_(2)NO_(2) lt overline(C)H_(2)CN lt overline(C)H_(2)Cl lt overline(C)H_(2)CH_(3)`

ANSWER :B
Discussion
2.

What will be the percentage of dissociation in 1.0 M CH_(3)CO OH at equilibrium having dissociation constantof 1.8xx10^(-5)?

Answer»


SOLUTION :As inProblem `2, K = (C alpha^(2))/(1-alpha), i.e., 1.8xx10^(-5)=(1xxalpha^(2))/(1-alpha)~~ alpha^(2) or alpha = sqrt(1.8xx10^(-5))=4.24xx10^(-3)`
% dissociation `= (4.24xx10^(-3))xx100=0.424`
Discussion
3.

Which of the following is an extensive property?

Answer»

MOLAR volume
Density
Molarity
Entropy

Answer :D
Discussion
4.

White fumes appear around the bottle of anhydrous aluminium chloride. What is the reason ?

Answer»

Solution :Anhydrous `AICI_(3)` is hydrolysed partially with atmospheric moisture to LIBERATE HYDROGEN CHLORIDE gas. Moist `HCl` APPEARS white in COLOUR.
Discussion
5.

What type of organic compounds cannot be Kjeldahlised ?

Answer»

Solution :COMPOUNDS CONTAINING nitrogen atom in the ring and those compounds in which nitrogen is directly LINK either to OXYGEN or to another nitrogen atom such as in nitro `(-NO_(2))` and AZO (-N = N-) compounds.
Discussion
6.

Which of the following statements about petroleum is correct?

Answer»

PETROLEUM is a dark coloured OILY liquid with a characteristic smell
Petrol is HEAVIER than water
Petroleum is insoluble in water
all of the above

Solution :Petroleum is water insoluble in nature
Discussion
7.

What happens when HI reacts with teri-butyl alcohol ?

Answer»

Solution :`CH_(3) underset("Tert, butyl alcohol")(-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-OH)+HI overset(KI)underset(H_(3) PO_(4))(to)CH_(3) underset("Tert. butyl IODIDE") (-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-I) + H_(2)O`
Discussion
8.

What is the work of salt bridge in Denial cell ?

Answer»

SOLUTION :Work : (i) CONNECTING TWO container.
(II) MAINTAIN neutrality of electrolyte.
Discussion
9.

Which of the following statements is not true for Ce^(3+) and Yb^(3+)?

Answer»

Both ABSORB in UV region
Both show f-f transition
Both show 4f to 5d transition
Both ions are colorless

Answer :B
Discussion
10.

Which of the following acid has the same molecular weight and equivalent weight

Answer»

`H_(3)PO_(2)`
`H_(3)PO_(3)`
`H_(3)PO_(4)`
`H_(2)SO_(4)`

ANSWER :A
Discussion
11.

Which of the following variant of hydrogen spectrum results from nuclear spin interaction with that of electron?

Answer»

Fine spectrum
Stark effect
Zemann effect
Hyperfine spectrum

Solution :`lambda = (h)/(SQRT(2mq.v)), (lambda_(alpha))/(lambda_(p)) = sqrt((m_(p)(1).V)/(4m_(p).(2).x)), x = (v)/(8)`
Discussion
12.

Which one of the following law is used to explain gas-solution equilibrium processes?

Answer»

BOYLE's law
GRAHAM's law
Henry's law
CHARLE's law

SOLUTION :Henry.s law
Discussion
13.

Which of the following does not represent the resonating structure of

Answer»




ANSWER :B
Discussion
14.

Which of the following hydroxides is the strongest base.

Answer»

`Ba(OH)_(2)`
`Mg(OH)_(2)`
`Ca(OH)_(2)`
CaOH

Solution :Hydroxide of IA groupelements are more IONIC there by more tendency to GIVE `OH^(-)` IONS when DISSOLVED in water
Discussion
15.

What happenes whenquick lime is heated with silica

Answer»

SOLUTION :`CaO+SiO_2 RARR CaSiO_3`
Discussion
16.

Which elements of group 13, except B, can form tetrahedral and octahedral complex in aqueous medium ?

Answer»

Solution :TETRAHEDRA species : `[m(OH)_4]^(-)`
OCTAHEDRAL species : `[m(H_2O)_4]^(+3)`
Discussion
17.

Which of the following is right for CO_2 ?

Answer»

It is a LEWIS ACID.
It is a Lewise BASE.
It is a BRONSTED acid.
It is a Bronsted base.

Answer :A
Discussion
18.

Which of the following molecule possess least resonance stability ?

Answer»




Solution :In (D) carbon is `sp^(3)` TYPE, it is not AROMATIC and HENCE it is least stable. While REMAINING are aromatic and hence they are more stable.
Discussion
19.

Which of the following statements is right regarding CH_(3)-, CH_(3)CH_(2)-, (CH_(3))_(2)CH-, (CH_(3))_(3)C-

Answer»

Increasing HYPER conjugation left to right
Decreasing hyper conjugation from left right
Decreasing inductive effect from L to R
Both (a) & (b)

Solution :Hyper conjugation increase by increase of `ALPHA`-H atoms
`-CH_4 to " no " alpha - H`

`CH_3 - UNDERSET(CH_3)underset(|)overset(CH_3)overset(|)C- to ` Has 9 `-alpha - H` atoms
Discussion
20.

Try all possible approaches to justify that the following reactions re redox reaction (a)CuO(s)+H_(2)rarrCu(s)+H_(2)O(g) (b)Fe_(2)O_(3)(s)+3CO(g)rarr2Fe(s)+3CO_(2)(g) (c )4BCI_(3)(g)+3 LiAIH(s)rarr2B_(2)H_(6)(g)+3LiCI(s)+3AICI(s) (d)2K(s)+F_(2)(g)rarr2K^(+)F^(-)(s) (e )4NH_(33)(g)+5O_(2)(g)rarr4NO(g)+6H_(2)O(g)

Answer»

Solution :(a) `CuO(s)+H_(2)(g)rarrCu(s)+H_(2)O(g)`
here O is removed form CuO therefore it is reduced to Cu while o is added to `H_(2)`form `H_(2)` therefore it is oxidised furhter O.N of Cu DECREASES form +2 in CuO to 0 in Cu that of H increases from 0 in `H_(2)` to +1 `H_(2)O` therefore CuO reduceed to Cu but `H_(2)` is oixdised to `H_(2)O` thus this is REDOX reactoin
(b) `Fe_(2)O_(3)(s)+3cO(g)rarr2fe(s)+3 CO_(2)(g)`
here O.N of Fe decreases form +3 is `Fe_(2)O_(3)` to 0 in Fe while that of c increases form +2 in CO to + in `CO_(2)` further oxygen is aremoved from `Fe_(2)O_(3)`and added to CI therefore `Fe_(3)O_(3)` is reduced while CO is oxidised thus this is a redox reaction ltbnrgt (c ) `4B CI_(3)(g)+Li AI H_(4)(s)rarr 2B_(2)H_(6)(g)+3 Li CI (s) + 3AICI_(3)`
here O.N of B decreases form + in `CrCI_(3)` to -3 Li `CI(s) +3 AICI_(3)(s)`
here O.N of b decrease form +3 in `BrCI_(3)` to -3 in `B_(2)H_(6)` while that of H increases from -1 Li `AIH_(4)`to +1 in `B_(2)H_(6)`
(d) `2K(s) +F_(2)rarr2F^(+)F^(-)(s)`
here each k atom has lost one letron to form `K(+)` while `F_(2)` has gained two electrons to form two ions therefore k is oixdised while `F_(2)` is reduced thus it is a redox rection
(e ) `4HN_(3)(g)+5O_(2)(g)rarr4NO(g)+6H_(2)O(g)`
here O.N of N increases from -3 is `NH_(3)` ot +32 is NO while that O decreaess from 0 is `O_(2)` to -2 in NO or `H^(@)O` therefore `NH_(3)` is oxidised while `O_(2)` is reduced
further H been removed has been oxidised while `O_(2)` is reduced thus this isa redox reaction
Discussion
21.

Which of the following pairs of structures donot constitute resonating structures ?

Answer»

SOLUTION :They DONOT CONTRIBUTE TOWARDS RESONANCE.
Discussion
22.

The weakest Lewis acid strength of BF_3 among boron halides can be explained on the basis of

Answer»

the most electronegative NATURE of F
`P pi - P pi` back BONDING
`d pi - p pi` back bonding
bond ENERGY of B - F bond.

Solution :`P pi - P pi` back bonding
Discussion
23.

Write the functional group of (i) thiocyanate (in) isothiocyanate (iii) thiols (iv) thioether

Answer»

Solution :(i) Thio CYANATE -SCN
(II) Isothiocyanate -NCS
(iii) thiols -SH
(iv) THIOETHERS -S-
Discussion
24.

What is vicinal dihalides ? Give examples.

Answer»

Solution :VICINAL dihalide means attachment of two halogen ATOS to ADJACENT (neihgbour) CARBON ATOMS of compound.
e.g.. `CH_(2)Br CHBrCH_(3), CH_(3) CHBrCH_(2)Br`…..
Discussion
25.

Which of the following is water repellent ?

Answer»

Silicone
Polythene
Teflon
Bakelite

SOLUTION :SILICON BASES are WATER REPELLENT.
Discussion
26.

Which of the following substances can be used for drying gases ?

Answer»

CALCIUM carbonate
Sodium carbonate
Sodium bicarbonate
Calcium oxide

Answer :D
Discussion
27.

Write the structure of the following compounds (i) 1-Bromo-4-ethyl cyclohexane (ii) 1,4-Dichlorobut-2-ene (iii) 2-Chloro-3-methyl pentane.

Answer»

SOLUTION :(i)
(ii) `H_(2)underset(Cl)underset(|)(C)-CH=CH-underset(Cl)underset(|)(C)H_(2)`
(iii) `H_(3)C-CH_(2)-underset(CH_(3))underset(|)(C)H-underset(Cl)underset(|)(C)H-CH_(3)`.
Discussion
28.

Which of the following molecule does not exist due to its zero bond order?

Answer»

`H_(2)^(-)`
`He_(2)^(+)`
`He_(2)`
`H_(2)^(+)`

ANSWER :C
Discussion
29.

Which one of the following is not a covalent hydride?

Answer»

`CaF_(2)`
MgO
`[FE(CN)_(6)]^(4-)`
KCl

Solution :`[Fe(CN)_(6)]^(4-)`
Discussion
30.

Which of the following statement are correct I) Now -a days syngas is produced from sewage , saedust , scrap wood ,news paper etc. (II) The processs of proucing syngas from coal is called coal gassification .III) The producation of dihdration can be increased by the presence of iron chromate catalyst. IV) 77% of the industrial s=dihyrogen is propduced from perto chemicals

Answer»

I,II
III,IV
I,III
I,II,III,Iv

Answer :4
Discussion
31.

Which is the following is the strongest acid ?

Answer»

3,5-dinitrophenol
2,4-dinitrophenol
phenol
2,4,6-trinitrophenol

Answer :D
Discussion
32.

What are the main features of quantum mechanical model of an atom

Answer»

Solution :(1) The energy of electrons in an ATOMS is quantised.
(2)The EXISTENCE of quantized electrons energy levels is a direct results of the like properties of electrons.The solutions of schrodinger WAVE equation gives the allowed energy levels(orbitals).
(3)According to Heisenberg.s uncertainty principle,the exact position and momentum of an electron cannot be determined with absolute accuracy.As a consequence,quantum mechanics introduced the concept of orbital.Orbital is a three dimensionalspace in which the probality of finding the elctron is maximum.
(4)The solution of Schrodinger wave equation for the allowed energies of an atom gives the wave FUNCTION `Psi`,which represents an atomic orbital.The wave nature of electron present in an orbital can be well defined by the wave function `Psi`.
(5)The wav e function `Psi` itself has no physical meaning.However,the probability of finding the electron in a small volume dx,dy,dz around a point(x,y,z) is proportional to`|Psi(x,y,z)|^(2)`dxdydz`|Psi(x,y,z)|^(2)` is known as probability and is always POSITIVE.
Discussion
33.

Which of the following is correct IUPAC ?

Answer»

1-ethyl-3-isopropyl-5-propyl CYCLO HEXANE
1-propyl-3-isopropyl-5-ethyl cyclo hexane
3-ethyl-5-isopropyl-1-propyl cyclo hexane
1-isopropyl-3-ethyl-5-propyl cyclo hexane

SOLUTION :1-ethyl-3-isopropyl-5-propyl cyclo hexane.
Discussion
34.

What are the conditions under which the relation between 'V' and 'n' are plotted ?

Answer»

<P>At CONSTANT P 
At constant P, V 
At constant T, V 
At constant P, T 

ANSWER :D
Discussion
35.

Which one is used as an purifier in space craft?

Answer»

QUICK lime
Slaked lime
Potassium SUPER oxide
Anhydrous `CaCl_(2)`

ANSWER :C
Discussion
36.

Which is a natural colloidal

Answer»

SODIUM chloride
Urea
Canesugar
Blood

Answer :D
Discussion
37.

Weight of H_(2)O_(2) present in 560 ml. of 20 vol. H_(2)O_(2) solution is approximately

Answer»

69 g
34 g
32 g
3.4 g

Solution :100 VOL _______ 30%
20 vol _______ ?
= 6%
100 ML ________ 6 grams
560 ml _________ ?
= 33.6 GMS
Discussion
38.

When Br_(2) is mixed with phosphorous, first PBr_(3) is formed till all phosporous has reacted. If Br_(2) still remains, PBr_(5) is formed as far as possible. If equal masses of Br_(2) and P are mixed, which of the following will surely remain in the reaction mixture

Answer»

P
`PBr_(2)`
`PBr_(5)`
`Br_(2)`

Solution :`{:(2P+3Br_(2)rarr,2PBr_(3)),(2xx31,3xx 160),(62,480):}`
If equal MASSES of PHOSPHOROUS and bromine are mixed, phosphorous is excess REAGENT.
Discussion
39.

Which of the following can be used in Friedel Crafts acylation reactions ?

Answer»

`CH_(3)COOCH_(3)`
`CH_(3)CH_(2)COCL`
`CH_(3)CH_(2)CL`
`(CH_(3)CO)_(2)O`

Answer :B::D
Discussion
40.

Which of the following compound does not react with metallic sodium?

Answer»

`CH_(3)CH(OH)CH_(3)`
`CH_(3)-O-CH_(3)`
`CH_(3)COOH`
`C_(2)H_(5)OH`

Solution :ETHERS donot react with metallic SODIUM.
Discussion
41.

Two closed bulbs of equal volume (V) containing an ideal gas initially at pressure P_(i) and temperature T_(1)are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to T_(2). The final pressure P_(f) is :

Answer»

`p_(i) ((T_(1)T_(2))/(T_(1) + T_(2)))`
`2p_(i) ((T_(1))/(T_(1) + T_(2)))`
`2 P_(i) ((T_(2))/(T_(1) + T_(2)))`
`2 p_(i) ((T_(1) T_(2))/(T_(1) + T_(2)))`

Solution :SINCE, vessels are closed
`:.` Initial moles `=` FINAL moles
`(p_(i)V)/(RT_(1)) + (p_(i) V)/(RT_(1)) = (p_(f) V)/(RT_(2)) + (p_(f)V)/(RT_(1))`
`(2p_(i))/(T_(1)) = p_(f) [(1)/(T_(1)) + (1)/(T_(2))]`
`p_(f) = 2p_(i) [(T_(2))/(T_(1) + T_(2))]`
Discussion
42.

Which of the following ratio of volume of positive and negative ions are minimum ?

Answer»

CSI
LIBR
CsF
NaCl

Answer :C
Discussion
43.

Which of the following statement(s) is/areincorrect fora reaction ,A_(2)(g) + B(g) to A_(2) B(g) assuming ideal gas behaviour if Delta H_(R)^(@)=-100 Kcal //"mole"andDelta S_(R)^(@)=- (1)/(3) kcal //" mole"K attemperature T=300 K.

Answer»

The reaction is at EQUILIBRIUM when occuredat 1 BAR pressure of each gas and 300 K.
No non-P V work can be obtainedfrom the REACTIONAT 300 K at standerconditions
In a rigidcontainerthe above reactionwill be spontaneiousat 300 K.
Whenperformedin arigid conatinerthereaction will be endothermic.

Answer :C,d
Discussion
44.

Which salt is significantly more soluble in a strong acid than in water?

Answer»

`PbF_(2)`
`PbCI_(2)`
`PbBr_(2)`
`PbI_(2)`

ANSWER :A
Discussion
45.

Write the products P, Q, R and S in the given reaction sequence.

Answer»


ANSWER :`(##RES_CHM_ROHR_E03_107_A01##)`
Discussion
46.

Which substance are present in industrial effluents ?

Answer»

HEAVY METALS
Plastic
Glass
All of these

SOLUTION :Heavy metals
Discussion
47.

Which of the hydrolysis resction of halides of III - A group elements is correct.

Answer»

`AlCl_(3)+3H_(2)O rarr Al(OH)_(3)+3HCl`
`BCl_(3)+3H_(2)O rarr H_(3)BO_(3)+3HCl`
`BF_(3)+H_(2)O rarr H_(3)BO_(3)+HF`
`AlBr_(3)+H_(2)O rarr Al(OH)_(3)+3HBr`

Solution :`BF_(3)+H_(2)O rarr [(BF_(3))OH]^(-)`
Discussion
48.

Which of the following metal have high reducing power ?

Answer»

LI
NA
K
CS

ANSWER :A
Discussion
49.

What is the effect of reducing the volume on the system described below ? 2 C (s) + O_(2) (g) hArr 2 CO (g)

Answer»

Solution :On reducing the volume, the pressure will increase. By LE Chatelier's PRINCIPLE , equilibrium will SHIFT to the side accompanied by decrease of pressure, i.e., decrease in the number of gaseous MLES, i.e., BACKWARD sirection.
Discussion
50.

Which of the following species has a linear shape ?

Answer»

`NO_(2)^(+)`
`O_(3)`
`NO_(2)^(-)`
`SO_(2)`

Solution :`O=underset(+)N=O` is LINEAR . All others are BENT molecules/ions.
Discussion