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.

Select correct order about bond strength

Answer»

`O_(2)gtO_(2)^(+1)gtO_2^(-)gtO_(2)^(2-)`
`O_(2)^(2-)gtO_(2)^(-)gtO_2^(+)gtO_(2)`
`O_(2)^(+)gtO_(2)gtO_2^(-)gtO_(2)^(2-)`
`O_(2)^(2-)gtO_(2)^(-)gtO_2gtO_(2)^(+)`

SOLUTION :`N//A`
2.

Select correct optionhaving majoor product:

Answer»




`Me_(3)C-O-Me OVERSET(HI)RARR Me_(3)C-I+MeOH`

Solution :Major PRODUCT of
3.

Select correct option for True (T) and False (F) (i) In the unit cell of NaCl there are 4Na^(+)Cl^(-) units present. (ii) At very high temperature paramagnetic substance changes to ferromagnetic substance. (iii) CrCO_2 is ferromagnetic and has conductivity as that of metal. (iv) Solid ammonia is molecular solid having low melting point.

Answer»

TFTT
TTTT
FFFT
TFTF

Answer :A
4.

Select correct option for the statements given with reference to electrochemical cell (where T=true and F=false) (i) In external circuit e^(-) flow from cathode to anode (ii) In solution electricity conducted through ions (iii) In external circuit electric current flow from anode to cathode (iv) Anions move from anode to cathode through salt bridge

Answer»

TFTF
FTFF
FFFT
FTTF

Solution :FEATURES of VOLTAIC CELL.
5.

Select correct method to prepare Me_(3)C-COOCMe_(3) :

Answer»

`Me_(3)C-COOH+Me_(3)C-OHoverset(conc.H_(2)SO_(4))to`
`Me_(3)C-COOH+Me_(3)UNDERSET((2)"electrolysis")overset((1)aq.NaOH)to`
`Me_(3)C-COOH+Me_(3)underset((2)I_(2)"CC"l_(4),Delta)overset((1)"moist" Ag_(2)O)to`
`Me_(3)C-underset(O)underset(||)C+CMe_(3)overset(m.CPBA)to`

Solution :A will produce `Me_(3)C-O-Cme_(3)` as a MAJOR product by `A_(AC^(1))`.
6.

Select correct code about complex [Cr(NO_(2)(NH_(3))_(5)][ZnCl_(4)] (P) IUPAC name of the compound is pentaamminentrito-N-chromium (III) tetrachloridozincate (II) (Q) It shows geometrical isomerism (R ) It shows linkage isomerism (S) It shows co-ordination isomerism

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R, S only
P, R and S only
Q, R, S only
P, Q, R and S

Answer :B
7.

Select correct match:

Answer»


SOLUTION :`CO_(3)^(2-),HCO_(3)^(-) overset(CaCl_(2)" sol.")toCaCO_(3)darr(p PT.)+HCO_(3)^(-)("Soluble")overset("Filtrate")toHCO_(3)^(-)`
8.

Select correct matching :-

Answer»

PYROMETALLURGY : EXTRACTION of Fe
Electrometallurgy : Extraction of Al
Hydrometallurgy : Extraction of Au
All above are correct

Answer :D
9.

Select correct diagram about the acidic strength of oxides :-

Answer»




SOLUTION :`N//A`
10.

Select correct conversion:-

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ANSWER :A::C::D
11.

Select compound having maximum solubility in water.

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`P=2P_(0)`
`P=4P_(0)//3`
`N=2P_(0)V_(0)..3RT_(0)`
`n=3P_(0)V_(0)//2RT_(0)`

Solution :
NUMBERS of moles =`(P_(0)V_(0))/(RT_(0)) =x`
`(n_(i)R_(0)T_(0))/(V_(0))=(n_(2)R_(0)2T_(0))/(V_(0))`
`n_(2)=1/3xx2x =1/3 xx2 xx(P_(0)V_(0))/(RT_(0))`
`n_(2)=2/3 (P_(0)V_(0))/(RT_(0))`
`P=n_(2)(R(2T_(0)))/(V_(0)) =(2R_(0)V_(0))/(3RT_(0)) xx(R(2T_(0)))/(V_(0))=(4P_(0))/3`
12.

Selectcorrect code:-(a) In (BeH_2)_n all bond's are 3c - 2e. (b) In (B_2H_6), all H-atom are present in a plane (c) In I_2Cl_6, I-Atom sp^3d^2 hybridised (d) In C_2H_6, C-atom used vacant orbital in a hybridisation

Answer»

T F T T
FT T F
T F T F
T T T T

Answer :C
13.

Select correct about the complex salt formed by the combination of cation of tris(ethylenediamine)platinum(IV)chloride and Anion of sodium tetrachoridolplatinate(II).

Answer»

It is `[Pt(NH_(2)CH_(2)CH_(2)NH_(2))_(3)][PtCl_(4)]`
It is `[Pt(NH_(2)CH_(2)CH_(2)NH_(2))_(3)][PtCl_(6)]`
COORDINATION number of METAL is SIX in cation and four in anion
IUPAC name of SALT = tris(ethylenediamine)platinum(IV) tetrachloridoplatinate(II)

SOLUTION :`[Pt("en")_(3)]^(4+)+2[PtCl_(4)]^(2-) to [Pt("en")_(3)][PtCl_(4)]_(2)`
14.

Select correct about covelent character

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`SnCl_(4) gt SnCl_(2)`
`SbCl_(5) gt SbCl_(3)`
`UF_(6) gt UF_(4)`
`CaCl_(2) gt ZnCl_(2)`

Solution :With INCREASE in charge on CATION COVALENT characterincreases.
15.

Select 'cis' isomer among the following

Answer»




ANSWER :A::B
16.

Select and write the most appropriate answer from the given alternatives for each sub-question : What is natural rubber?

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Cis-1, 4-polyisoprene
Neoprene
Trans-1, 4-polyisoprene
Butyl rubber

Solution :cis-1, 4-Polyisoprene
17.

Select and write the most appropriate answer from the given alternatives for each sub-question : Which among the following reducing agent is 'not' used to reduce acetaldehyde to ethyl alcohol?

Answer»

Na-Hg and water
Zn-Hg and conc. HCl
`H_(2)`-Raney `Ni`
`Li-AlH_(4)//H^(+)`

Solution :Zn-Hg and conc. HCl because it reduce ALDEHYDE into their CORRESPONDING alkane.
18.

Select branched polymer of glucose :

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Amylopectine
Cellulose
Glycogen
Amylose

Solution :N//A
19.

Select and write the most appropriate answer from the given alternatives for each sub-question : C_(2)H_(5)-Br+NaI overset("dry acetone")rarr C_(2)H_(5)-I+ NaBr The above reaction is :

Answer»

WURTZ reaction
Balz-Schiemann reaction
Swarts reaction
Flinkelstein reaction

Answer :A::C::D
20.

Select and write the most appropriate answer from the given alternatives for each sub-question : Acetaldehyde, when treated with which among the following reagents does 'not' undergo addition reaction?

Answer»

Ammonia
Hydroxyl AMINE
AMMONICAL SILVER NITRATE
Semicarbazide

Solution :Ammonical silver nitrate
21.

Select and write the most appropriate answer from the given alternatives for each sub-question: The hybridisation of phosphorus in phosphorus pentachloride is :

Answer»

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

Solution :In `PCl_(5)`, PHOSPHORUS undergoes `sp^(3)d` hybridization and has trigonal bipyramidal geometry.
22.

A polymer which containsester linkage is :

Answer»

Teflon
Buna-N
Dextron
Neoprene

Answer :C::D
23.

Select and write the most appropriate answer from the given alternatives for each sub-question :

Answer»

`CrO_(2) Cl_(2)`
`CrOCl_(2)`
`CrCl_(3)`
`Cr_(2)Ocl_(2)`

SOLUTION :`CrO_(2)Cl_(2)`
24.

Seiect the incorrect statement(s) about benzene amongst the following

Answer»

because of UNSATURATION BENZENE easily UNDERGOES addition
there are two types of C - C bonds in benzene molecule
there is CYCLIC delocalisation of rc-electrons in benzene
monosubstitution of benzene gives THREE isomeric products.

Answer :A::B::D
25.

Select a ferromagnetic material from the following

Answer»

Dioxygen
Chromium (IV) oxide
Benzene
Dihydrogen monoxide

Solution :Compounds or ions or ELEMENTS which are strongly attracted towards magnetic FIELD are ferromagnetic (maximum paramagnetic) upaired electrons in valence sheel more the number of unpaired electrons more tha paramagnetic character i.e., ferromagnetic character.
According to MOT dioxygen `(O_(2))` contain ONE unpaired electron. Hence it is paramagnetic. Chromium (IV) oxide `(CuO_(2))` contain two unpaired electrons in d-orbitals. Hence it is ferromagnetic i.e. maximum paramagnetic. Dihydrogen monoxide `(H_(2)O)`: it is DIAMAGNETIC Benzene `(C_(6)H_(6))`: It is diamagnetic
26.

[Se(H_2 O)_6]^(3+) ion is

Answer»

colourless and DIAMAGNETIC
coloured and OCTAHEDRAL
colourless and paramagnetic
coloured and paramagnetic

Solution :`Sc=[Ar]3D^(1) , 4s^2`
Oxidation state of Sc in `[Sc(H_2 O)_6]^(3+)` is `Sc^(3+)`
`Sc^(3+) = [Ar] 3d^0 , 4s^(0)`
Thus `Sc^(3+)` does not have unpaired ELECTRON, hence it is diamagnetic and colourless.
27.

Sea weeds are important source of

Answer»

Iron
Chlorine
Iodine
Bromine

Answer :C
28.

Secretion of HCl in the stomach is stimulated by

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Histamine
Dopamine
Noradrenaline
Serotonine

Answer :A
29.

Secondary structure of proteins refers to

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mainly denatured proteins and the structure of the PROSTHETIC group
three DIMENSIONAL structure , especially between amino acid residue that the DISTANT from each other in the polypeptide chain
linear structure of amino acid residues in the polypeptide chain
regular folding patterns of continuous protions of the polypeptide chain

Solution :SECONDARY structure of a protein refers to regular folding patterns of continuous portions of the polypeptide chain.
30.

Secondary structure of proteins refers to:

Answer»

Mainly denatured proteins and structure of prosthetic group
Three DIMENSIONAL structure SPECIALLY the BOND between amino acid residues that are distant from each other in polypeptide chain
Linear sequence of amino acid residue in the polypeptide chain
Regular folding patterns of continuous PORTION of the polypeptide chain

Answer :D
31.

Secondary structure of protein is mainly governed by

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HYDROGEN BONDS
covalent bonds
IONIC bonds
Disulphide bonds

ANSWER :A
32.

Secondary structure of proteins is due to :

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PEPTIDE BOND
HYDROGEN BONDS
COVALENT bond
Co-ordinate bond

Answer :A
33.

Secondary structure of protein refers to

Answer»

Mainly denatured proteins and structure of prosthetic groups
Three-dimensional structure, especially the bond between amino ACID RESIDUES that are distinct from each other in the poly-peptide CHAIN
Linear SEQUENCE of amino acid residues in the polypeptide chain
Regular folding patterns of continuous portions of the polypeptide chain

Answer :D
34.

Secondary pollutant which stops Hill reaction is

Answer»

Aldehydes
Nitric acid
Peroxyacetyl nitrate (PAN)
SULPHURIC acid

Solution :PAN prevents PHOTOLYSIS of water in photosynthesis or hill REACTION
35.

Secondary nitroalkanesreact with nitrious acid to form

Answer»

RED solution
blue solution
green solution
yellow solution

Answer :B
36.

Secondary nitro alkanes react with nitrous acid to form……………..

Answer»

RED solution
blue solution
green solution
yellow solution

Answer :B
37.

Secondary nitro compounds on hydrolysis in acidic medium give

Answer»

ketones
carboxylic acid
nitrolic acid
none of these

Solution :SEE HYDROLYSIS of nitro alkanes with HOT conc. `HCL`.
38.

Secondary and tertiary alcohols always give E_(1) reaction indehydration. Primary alcohols whose beta- carbon is 3^(@)or 4^(@) also give E_(1) reaction. However, the primary alcohols whose beta-carbon is 1^(@) or 2^(@) give E_(2) reaction. Dehydrating agents like conc. H_(2)SO_(4), Al_(2)O_(3), anhydrous ZnCl_(2) are used. The reactivity of alcohols for elimination reaction lies in following sequence : Tertiary alcohol gt secondary alcohol gt primary alcohol Electron attracting group present in alcohols increase the reactivity for dehydration. Greater is the -I effect of the group present in alcohol, more will be its reactivity. Both E_(1) and E_(2) mechanism give the product according to Satzeff's rule, i.e., major product is the most substituted alkene. underset("3-Methylbutan-2-ol")(CH_(3)-underset(CH_(3))underset(|)(C)H-overset(OH)overset(|)(C)H-CH_(3)underset("above 413K")overset("conc." H_(2)SO_(4))(rarr)) underset("2-Methylbut-2-ene(major product)")(CH_(3)-underset(CH_(3))underset(|)(C)=CH-CH_(3))+underset("3-Methylbut-1-ene(minor product)")(CH_(3)-underset(CH_(3))underset(|)(C)H-CH=CH_(2)) Which of the following dehydration products is incorrect ?

Answer»


`CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-overset(OH)overset(|)(C)H-CH_(3)overset("CONC."H_(2)SO_(4))(rarr)CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=CH_(2)`
`CH_(3)CH_(2)CH_(2)CH_(2)OHoverset("conc." H_(2)SO_(4))(rarr) CH_(3)-CH=CH-CH_(3)`

Answer :A
39.

Secondary and tertiary alcohols always give E_(1) reaction indehydration. Primary alcohols whose beta- carbon is 3^(@)or 4^(@) also give E_(1) reaction. However, the primary alcohols whose beta-carbon is 1^(@) or 2^(@) give E_(2) reaction. Dehydrating agents like conc. H_(2)SO_(4), Al_(2)O_(3), anhydrous ZnCl_(2) are used. The reactivity of alcohols for elimination reaction lies in following sequence : Tertiary alcohol gt secondary alcohol gt primary alcohol Electron attracting group present in alcohols increase the reactivity for dehydration. Greater is the -I effect of the group present in alcohol, more will be its reactivity. Both E_(1) and E_(2) mechanism give the product according to Satzeff's rule, i.e., major product is the most substituted alkene. underset("3-Methylbutan-2-ol")(CH_(3)-underset(CH_(3))underset(|)(C)H-overset(OH)overset(|)(C)H-CH_(3)underset("above 413K")overset("conc." H_(2)SO_(4))(rarr)) underset("2-Methylbut-2-ene(major product)")(CH_(3)-underset(CH_(3))underset(|)(C)=CH-CH_(3))+underset("3-Methylbut-1-ene(minor product)")(CH_(3)-underset(CH_(3))underset(|)(C)H-CH=CH_(2)) Which among the following sequences of reactivity for dehydration is incorrect ?

Answer»


`CH_(3)CH_(2)CH_(2)CH_(2)OH ltCH_(3)-underset(OH)underset(|)(C)H-CH_(2)-CH_(3)LT CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-OH`

Answer :C
40.

Secondary butyl alcohol is dehydrated according to

Answer»

SAYTZEFF RULE
MARKOWNIKOFF rule
Anti-Markownikoff rule
NONE of these

ANSWER :A
41.

Secondary amines are represented by

Answer»

`-NH_(2)` GROUP
`GT NH`
`gt N`
`-NO_(2)`

Answer :B
42.

Secondary amines on oxidation with KMnO_(4) gives:

Answer»

DIALKYL hydroxylamine
tetralkyl hydrazine
ketones
amine oxide

Answer :B
43.

Secondary amines on oxidation with Caro's acid gives:

Answer»

DIALKYL hydroxylamine
tetraalkyl hydrazine
ketones
amine oxide

Answer :A
44.

Secondary amines react with aldehydes and ketones containing alpha-hydrogens to form____

Answer»

SOLUTION :ENAMINES
45.

Secondary amine forms yellow oily liquid with nitrous acid. which on warming with phenol and conc. H_(2)SO_(4) given a brown or red colour and which at once change into blue-green. This reaction is called as:

Answer»

CARBYLAMINE REACTION
Labriel phlhalimide reaction
GABRIEL phthalmide reaction
Hofmann's mustard oil reaction

Answer :B
46.

Secondaryamineformsyellowoilyliquidnitronsacid, whichonwarmingwithphenoland conc. H_2 SO_4givesa brown or redcolourandwhichat oncechangesintoblue= green . Thisreactionis calledas :

Answer»

CARBYLAMINEREACTION
Liebermann's nitrosoreaction
Babrielpththalimidereaction
HOFMANN's mustedoilreaction

ANSWER :B
47.

Secondary amineformsinsolubenitrosoaminewith

Answer»

`HNO_(3)`
`HNO_(2)`
`CH_(3)COCl`
HCl

Answer :B
48.

Secondary amine could be separated by

Answer»

reduction of nitriles
Hofmann bromamide
reduction of amides
reduction of isonitrile

Solution :`underset("Isonotrile")(R-N overset(=)(RARR)C)+4H rarr underset("SEC. AMINE")(RNHCH_(3))`
49.

Second series of transition elements starts with:

Answer»

YITRIUM
Chromium
Zinc
Scandium

Answer :A
50.

Second law of thermodynamics is not a restriction in the working of a fuel cell. Explain.

Answer»

Solution :Convential method of converting chemical energy into ELECTRICAL energy INVOLVES three steps
Step I: Chemical energy `rarr` Heat energy
Step II : Heat energy `rarr` Mechanical energy
Step III : Mechanical energy `rarr` Electrical energy
The extent of heat CONVERTED into mechanical energy (step II) is limited by the second law of thermodynamics . Hence, the power plants are with only 40% efficiency. But in a fuel CELL, chemical energy is directly converted into electrical energy, with a theoretical 100% efficiency.