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 elements have the electronic configuration ns^(2)np^(4)in their outer most orbit?

Answer»

Inert gases
Chalcogens
Halogen
Inner transition ELEMENTS

SOLUTION :Elements of group-16 are KNOWN as chalcogens.
Discussion
2.

Which of the following hydrides has the largest bond angle ?

Answer»

`H_(2)S`
`H_(2)`TE
`H_(2) O`
`H_(2)`Se

Solution :`H_(2) O`
Discussion
3.

Which free radical is the most stable ?

Answer»

`OVERSET(*)(C)H_(3)`
`CH_(3)overset(*)(C)H_(2)`
`CHoverset(*)(C)H-CH_(3)`
`(CH_(3))_(3)overset(*)(C)`

ANSWER :D
Discussion
4.

Which of the following represents the best resonance form for H_2C = CHF ?

Answer»




SOLUTION :The fluorine atom MUST DONATE an electron pair to the DOUBLE bond
Discussion
5.

Whichof the following is truefor number ofelectronsorbitalsand type , orbitalspresentin N-orbitrespectively?

Answer»

`4,4 ` and 8
4,8 and 16
32,16 and 4
4,16 and 32

ANSWER :C
Discussion
6.

What is Birch reduction ? What is it used for ?

Answer»

SOLUTION :Reduction of alkynes with sodium in liquid ammonia is CALLED BIRCH reduction. It is used for PARTIAL reduction of alkynes to trans-alkenes. For example,
Discussion
7.

Which of the following gives red colour in Victor Meyer's test?

Answer»

n-Propyl alcohol
Isopropyl alcohol
tert-Butyl alcohol
sec-Butyl alcohol

Solution :`underset((1^(@)-"Alcohol"))underset("n-Propyl alcohol")(CH_(3)CH_(2)CH_(2)OH) "" underset((2^(@)-"alcohol"))underset("Isopropyl alcohol")(CH_(3)-overset(OH)overset(|)(CH)-CH_(3))`
`underset((3^(@)-"alcohol"))underset("tert-Butyl alcohol")(CH_(3)-underset(OH)underset(|)overset(OH)overset(|)(C)-CH_(3)) "" underset((2^(@)-"alcohol"))underset("sec-Butyl alcohol")(CH_(3)-overset(OH)overset(|)(CH)-CH_(2)-CH_(3))`
A `1^(@)` alcohol GIVES RED colour in Victor Meyer's TEST. Therefore, n-propyl alcohol (i.e., only `1^(@)` alcohol) will give a red colour in the test.
Discussion
8.

Which of the followingsetscontainonly isoelectronicions ?

Answer»

`Zn^(2+) , CA^(2+) , Ga^(3+) ,A1^(3+)`
`K^(+),Ca^(2+)Sc^(3+) ,C1^(-)`
`P^(3-) , S^(2-), C1^(-) , K^(+)`
`Ti^(4+), Ar, Cr^(3+) ,V^(5+)`

Solution : Species ofset (a)i.e.,`Zn^(2+)(30-2 = 28 ) , Ca^(2+)(20 -2=18), Ga^(3+) (31-3 = 28) , A1^(3+)(13 -3=10)`
havedifferentno of electron and henceare notisoelectronicions.
Species ofset ( b) i.e.,`K^(+)(19-1=18) ,Ca^(2+)(20-2 =18) , Sc^(3+)(21-3=18) ,C1^(-)(17+1=18) `are allisoelectron ionssince each one of themhas 18electrons.
Speciesof set (c )i.e., `P^(3-)(15+3 =18),S^(2-)(16+2 =18),C1^(-)(17+ 1=18) , K^(+)(19-1=18) ` are allisoelectron ionssince EACHONE of themhas 18 electrons .
Species ofset (d) i.e., `Ti^(4+) (22 -4 =18),Ar (18), Cr^(3+)(24-3=21) ,V^(5+)(23 -5= 18)` have DIFFERENT numberof electron and henceare notisoelectronicions.
Discussion
9.

Total number of resonating structures in the following compound is

Answer»


ANSWER :4
Discussion
10.

Two compounds with molecular formula C_(4)H_(6) is available , if one of the compound can react with soda amide while second can't react with ti, then find out that organic compound ?

Answer»

Solution :These compounds MAY be alkyne in nature.
`underset("But-2-yne")(CH_(3)C-=C CH_(3)) overset(NaNH_(2))rarr "Not a reaction"`.
`underset("But-1-yne")(CH_(3)CH_(2)C-=CH) overset(NaNH_(2))rarr underset("Sodium butinide")(CH_(3)CH_(2)C-=CNa)`
So, but-2-yne and But-1-yne are the compounds with MOLECULAR formula `C_(4)H_(6)`
Discussion
11.

Which is not correctly matched? I) Basic strength of oxides Cs_(2)OltRb_(2)OltK_(2)OltNa_(2)OltLi_(2)O II) Stability of peroxides Na_(2)O_(2)ltK_(2)O_(2)ltRb_(2)O_(2)ltCs_(2)O_(2) III) Stability of biocarbonate LiHCO_(3)ltNaHCO_(3)ltKHCO_(3)ltRbHCO_(3) IV) Melting point NaFltNaClltNaBrltNaI

Answer»

1 and 4
1 and 3
1 and 2
2 and 3

Answer :A
Discussion
12.

The total number of lattice arrangements in different crystal systems is

Answer»

`7.0`
`3.0`
`8.0`
`14`

SOLUTION :FACTUAL QUESTION.
Discussion
13.

Which of the following is Bragg's equation ?

Answer»

`nlambda=2thetasintheta`
`nlambda=2 d SIN THETA`
`2nlambda=d sin theta`
`n.theta//2=d//2sintheta`

SOLUTION :BRAGG's EQUATION is `nlambda=2d sin theta`.
Discussion
14.

What angles are associated with the following orbitals? sp,sp^(2)andsp^(3)

Answer»

Solution :`SP=180^(@)`
`sp^(2)=120^(@)`
`sp^(3)=109^(@)28`
Discussion
15.

What is mean by meta directing group ? Give examples of it and explain meta directing effect of -NO_(2).

Answer»

Solution :(a) Definition : Due to presence of certain functional group on benzene ring if on second substitution of any functional group acquired meta POSITION in benzene then FIRST substituted benzene is known as meta directing group.
(b) EXAMPLES : `-NO_(2), -COOH, -SO_(3)H, -CHO, -COOH_(3), -COCl, -COR, -COOR` etc are meta directing groups.

`-NO_(2)` group is present in nitrobenzene. This `-NO_(2)` group is meta directing. Following given structure (I) to (V) are resonating structures and (VI) is hybride structure.

In above given structure of nitrobenzene has positive charge of ortho and PARA position but meta poisiton is neutral. So more electro negative density is present on meta position.
Therefore, postive charge electrophilic `-NO_(2)` group is attaches to meta position. So `-NO_(2)` is meta directing in nature.
Discussion
16.

Wrtie the reasonance structure forSO_(3) ,NO_(2) and NO_(3)^(-) .

Answer»

SOLUTION :
`SO_(3) and NO_(3)^(-)` =
Discussion
17.

What is displacement reactions ? Give its types. Explain with example.

Answer»

Solution :The reactions in which one ion or ATOM in a compound is REPLACED (or substituted) by an ion or atom of the other element are called DISPLACEMENT reactions.
AB + C `gt` AC + B
Example: Metal displacement
`CuSO_(4) + Zn rarr ZnSO_(4)` + Cu
Example: Non-metal displacement 2KBr + `Cl_(2) rarr 2KCL + Br_(2)`
Discussion
18.

Whichof the followingsequencescontainatomicnumbersof onlyrepresentativeelements

Answer»

`3, 33, 53, 87 `
`2, 10, 22, 36 `
`7, 17 , 25 , 37 , 48 `
`9, 35 , 51, 88`

Solution :Elementsof s- andp-blockelementsare calledrepresentative elements , elements of d-block(Z=21-30 , 39 -48 , 57 and72 -80 and89and 104 -112 ) are called transitionelementswhile those of f-block( with Z=58-71and Z= 90 -103) arecalledinnertransitionelement . Inthe lightofthis divisionelementslisted under option ( a) andoption( d) are allrepresentative elements.
Discussion
19.

Which group is known as p-block elements ?

Answer»

SOLUTION :CONSEQUENTLY there are SIX groups of p-block elements in the PERIODIC table NUMBERING from 13 to 18.
Discussion
20.

What is Lindlar's catalyst ? What is it used for ?

Answer»

Solution :Pd deposited over `CaCO_3` or `BaSO_4` and partially poisoned by addition of LEAD acetate or SULPHUR or QUINOLINE is called Lindlar's CATALYST. It is used for partial reduction of alkynes to cis-alkenes . For EXAMPLE,
Discussion
21.

What are the products in the following sequence of reaction Compound (D) is

Answer»

`H_(2)N(CH_(2))_(4)NH_(2)`
`H_(2)N(CH_(2))_(6)NH_(2)`
`OHC(CH_(2))_(4)CHO`
`OHC(CH_(2))_(6)CHO`

Answer :B
Discussion
22.

Which of the following pairs will have the same number of atoms ? [ atme wt. H=1, O=16, C=12, Cl=35.5 g "mol"^(-1)]

Answer»

28 g CO and 36.5 g HCl
44 g `CO_(2)` and44 g CO
14 g `N_(2)` and `28 g CO_(2)`
`28 g N_(2)` and 36.5 g HCl

Solution :(A) (i) Molecular mass of CO `=(12+16)`
`= 28 g "MOL"^(-1)`
`:.28 g CO = 1 ` moleCO
(ii) Molecular mass of HCL `=(1+35.5)`
`= 36.5 f "mol"^(-1)`
`:.36.5 g HCl = 1 ` mole HCl
As CO and HCl both are 1 mole and they have same 2 atoms, hence will have same number of atoms
(B) `44 g CO_(2) =1 "mole" CO_(2)`
but `44g CO != 1 ` mole CO
`:.` They do not have equal number of molecules
(C) `14 g N_(2)`
`= (14)/(28) "mole" N_(2)`
`= 1/2 "mole" N_(2)`
`28 g CO_(2)`
`= (28)/(44) ` mole `CO_(2)`
`= 0.63.63` mole `CO_(2)`
`:. 14 g N_(2)` and `28 g CO_(2)` have have different moles and as a result different no. of molecules
(D) `28 g N_(2)`
`= (28)/(28) ` mole `N_(2)`
` = 1` mole `N_(2)`
`=2` mole N atoms
`18 g H_(2)O`
`= (18)/(18) ` mole `H_(2)O`
`= 1` mole `H_(2)O`
` = 3` mole atoms
`:.N_(2)` and `H_(2)O` have different no. of atoms
Discussion
23.

Which of the following will have the most negative electron gain enthalpy and which has the least negative? P, S, Cl, F. Explain your answer.

Answer»

Solution :Electron gain enthalpy generally becomes more negative across a period as we move from left to RIGHT. Within a group, electron gain enthalpy becomes less negative down a group. However, adding an electron to the 2p orbital LEADS to greater repulsion than adding an electron to the LARGER 3p orbital. Hence the element with most negative electron gain enthalpy is chlorine, the ONE with the least negative electron gain enthalpy is phosphorus.
Discussion
24.

Two different acid HA and HX have same pH than their concentration is same ? Why ?

Answer»

SOLUTION :YES, their concentration is same as their PH is same `[H^+]` is same in both and `[H^+]` = [HA]=[HX]
Discussion
25.

Which of the following statemernts pegarding projection shown below is true?

Answer»

Both (I) and (II) are OPTICALLY ACTIVE
(I) and (II) are IDENTICAL compounds
Only (I) is optically active
Only (II) is optically active

SOLUTION :
Discussion
26.

Which of the following statement is true about photochemical smog?

Answer»

it is reducing in nature
it is formed in winter
It is a sulphurous smog.
Components of the smog, `NO` and `O_(3)`. Irritate the NOSE and throat and their high concentration couses headache, chest pain, dryness of the throat, cough and DIFFICULTY in breathing.

Solution :Photochemical smog occurs in warm, dry and sunny climate. It has high concentration of `NO,NO_(2)` and `O_(3)`. Their low concentration causes irritation in nose and throat and their high concentration causes headached, chest pain, cough and difficulty in BREATING.
Discussion
27.

Which of the following isomer of the pentane gives four monochloropantane on chlorination?

Answer»

Pyrolysis
Substitution
Homolysis
Peroxidation

Answer :C
Discussion
28.

What is the oxidation number of S in S_(2)CI_(2)

Answer»

SOLUTION :The O.N of S in `S_(2)CI_(2)` is +1 shown : `OVERSET(-1)CI-overset(+1)S-overset(+1)S-overset(-1)CI`
Discussion
29.

What is atomic number which contain 2 electrons in 4-orbit ?

Answer»

12
20
30
32

Answer :B
Discussion
30.

Which of the following pair of elements are from the same group of the periodic table

Answer»

MG, Cs
Mg, Sr 
Mg, CI
Na, CI 

Answer :B
Discussion
31.

You are given 500 mL of 2 N HCl and 500 mL of 5 N HCl. What will be the maximum of 3 M HCl that you can make from these two solution?

Answer»

250 mL
750 mL
500 mL
1000 mL

Answer :B
Discussion
32.

Which type of molecules from miselles?

Answer»

Non-polar MOLECULES
Polar molecules
SURFACTANT molecules
any of the above

Solution :Surfactant molecules (which have hydrophillic as well as hydrophobic ends ) FORM miscelles.
Discussion
33.

Which of the following compound gives red ppt with CuCl_(2)//NH_(4)OH ?

Answer»

`CH_(3)-C-=C-CH_(3)`
`CH_(3)-CH_(2)-C-=CH`
`CH_(3)-CH_(2)-CH=CH_(2)`
`CH_(3)-C-=C-CH=CH_(2)`

ANSWER :B
Discussion
34.

Volume strength of H_(2)O_(2) = ___________.

Answer»

`11.2 XX "NORMALITY"`
`11.2 xx "MOLARITY"`
`("Normality")/(5.6)`
`("Molarity")/(11.2)`

ANSWER :A
Discussion
35.

The wavelengths of which series lie in the ultraviolet region ?

Answer»

Lyman
Balmer
Paschen
None of the above

ANSWER :A
Discussion
36.

Which of the following transitions are allowed in the normal electronic emission spectrum of an atom?

Answer»

`2s to 1S`
`2p to 1s`
`3d to 2p`
`5 d to 2s`

Solution :All electronic TRANSITION are POSSIBLE
Discussion
37.

What is the SI unit of density?

Answer»

`gm^(-3)`
`kg//m^(3)`
`gcm^(-3)`
`kg//cm^(3)`

Solution :b) Density of a SUBSTANCE is defined as its AMOUNT of mass per unit VOLUME.
SI unit of density=`(kg)/(m^(3))` or kg`m^(-3)`
Discussion
38.

Whichamong thefollowingtransition andwhichare innertransitionelement ? Sg, Bk, Er, Fm , Fe, Pb, Cr, Ca, Ar, Zr, Ce

Answer»

SOLUTION :Transitionelement `: Sg , Fe , CR, Zr`
Innertransitionelement `: BK , ER , FM , Ce`
Discussion
39.

The wrong statement regarding the solutions of alkali metals in liquid ammonia

Answer»

They are blue coloured because they absorb ENERGY in the visible region .
They LIBERATE hydrogen on standing resulting in the formation of AMIDE .
They concentrated solutions of alkali METALS in ammonia are bronze coloured .
Both blue coloured and bronze coloured solutions are paramagnetic in nature .

Answer :D
Discussion
40.

Which of the following property does not possess of Carbon atom.

Answer»

It can FORM 4 COVALENT bond.
Can form cyclic compound.
Can form `ppi-ppi` bond.
Can form `dpi-ppi` bond

ANSWER :D
Discussion
41.

When one s and three p orbitals hybridise,

Answer»

four EQUIVALENT orbitals at `90^@` to each other will be formed
four equivalent orbitals at `109^@ 28'` to each other will be formed.
four equivalent orbitals, that are lying the same plane will be formed
none of these

Solution :foru equivalent orbitals at `109^@ ,28.` to each other will be formed.
Discussion
42.

Write the relationship between equilibrium constant and enthapy.

Answer»

Solution :The value of equilibrium constant changes with CHANGE in TEMPERATURE.
If `K_(1)` and `K_(2)` are equilibrium constants at temperature `T_(1)` and `T_(2)`.
`DeltaH` - Heat of reaction at constant pressure.
Then,
`"log"(K_(2))/(K_(1))=(DeltaH)/(2.303R)[(T_(2)-T_(1))/(T_(1)T_(2))]`
Discussion
43.

Which complex forms when carbon monoxide enters into body and binds with hemoglobin ?

Answer»

CARBOXYHEMOGLOBIN COMPLEX
Hamencomplex
OXYGEN HEMOGLOBIN complex
Acidic complex

Solution :Carboxyhemoglobin complex
Discussion
44.

Which of the following statements is//are correct?

Answer»

`H_(2)O_(2)` is reduced to `O_(2)` by a strong reducing agent
`H_(2)O_(2)` is a non-planer molecule
The formation of `CrO_(5)` from `Cr_(2)O_(7)^(2-)` ion by the ACTION of `H_(2)O_(2)` in an acid medium is not a REDOX reduction
`H_(2)O_(2)` is oxidised to `OH^(-)` IONS by a two electron change

Answer :A::B::D
Discussion
45.

The sodium extract of an organic compound on treatement with FeSO_(4) solution, FeCl_(3) and HCl gives red solution. The Red colour of

Answer»

`FE(CN)_(3)`
`K_(4)[Fe(CN)_(6)]_(3)`
`Fe(CNS)_(3)`
`Fe_(2)S`

Answer :C
Discussion
46.

What is avogram?

Answer»

Solution :AVOGRAM is reciprocal of Avogadro constant in gram
Avogram `=(1)/(6.022)xx10^(23)g =1.66xx10^(-24)g`
The REAL value of unified mass is avogram
1 amu= `1.66 xx10^(-24)g=1.66xx10^(-27)KG`
Discussion
47.

Which prefix used in SI sysytem has coefficient10^(6) ?

Answer»

Micro
Tera
Mega
Femto

Solution :
Discussion
48.

The velocity of neutrons in nuclear reactor is slowed down by

Answer»

`H_2O`
`D_2O`
ZINC rods
Copper rods

Answer :B
Discussion
49.

Which of the following forms a toxic substance in blood by combining with haemoglobin?

Answer»

Carbon DIOXIDE
Carbon MONOXIDE
Oxygen
Methane

Solution :Carbon monoxide forms a toxic substane carboxyhaemoglobin by COMBINING withg HAEMOGLOBIN of the blood
Discussion
50.

What is allotropy ? Give examples of allotropes.

Answer»

SOLUTION :Two or more forms of the same elements in same physical STATE which differ in their physical properties but have same chemical properties are called allotropic forms or ( allotropes ) and the phenomenon is called allotropy.
(i) Diamod and graphite are allotropic forms of CARBON .
(ii) Red phosphorous and white phosphorous are allotropes of phoshorous.
(iii) Rhombic sulphur, monoclinic sulphur and plastic sulphur are allotropic forms of sulphur .
Discussion