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.

Wite the resonance strutures for NO_(2) and NO_(3)^(-).

Answer»

SOLUTION :
Discussion
2.

Three elements, X,Y and Z belong to the same period. Their oxides are acidic, amphoteric and basic respectively. The order of these elements in the periodic table is

Answer»

X,Y,Z
Y,Z,X
X,Z,Y
Z,Y,X

Answer :D
Discussion
3.

Which of the following reagents cannot be used for differentiation between CH_(3)CHO and CH_(3)-underset(O)underset(||)(C)-Ph?

Answer»

NaOI
Tollen's AGENT
`H_(2)N-OH`
`Ph-NH-NH_(2)`

ANSWER :A::C::D
Discussion
4.

Write the combustion of n-hexane with equation .

Answer»

Solution :COMBUSTION of n-hexane:
`2C_(6)H_(14)+19O_(2)to12CO_(2)+14H_(2)O`
Discussion
5.

What happens when a ferromgnetic or anti - ferromagnetic or a ferrimagnetic solid is heated ?

Answer»

SOLUTION :It CHANGES INOT PARAMAGNETIC at some TEMPERATURE
Discussion
6.

What is anhydrone?

Answer»

Solution :Magnesium PERCHLORATE, `MG( ClO_4)_2`is known as ANHYDRONE.
Discussion
7.

Which one of the following pairs of atoms/ ions have identical ground state configurations?

Answer»

`Li^(+) and He^(+)`
`Cl^(-) and Ar`
`Na and K`
`F^(+) and NE`

ANSWER :B
Discussion
8.

What is green fuel ?

Answer»

SOLUTION :FUEL obtained from PLASTIC waste has high octane rating. It CONTAINS no lead and is known as "GREEN fuel".
Discussion
9.

What is valency ? Explain.

Answer»

Solution :Valency is CHARACTERISTIC properties of the elements can be understood in terms of their electronic configurations.
The valence of representative elements is usually EQUAL to the NUMBER of ELECTRONS in the outermost orbitals or equal to eight minus the number of outermost electrons as SHOWN below.
Discussion
10.

When benzoic acid is treated with LiAlH_(4), it forms

Answer»

Banzaldehyde
Banzyl alcohol
Benzene
Toluene

Answer :B
Discussion
11.

The relative rates of mononitration of C_6H_5 - Z , " where " Z = CH_3 - , - NO, - OH , Clare

Answer»

`CH_3 GT OH gt NO_2 gt CL`
`OH gt Cl gt CH_3 gt NO_2`
`OH gt OH gt NO_2 gt Cl `
`OHgt OH gt NO_2 gt Cl`

SOLUTION :`OH gt CH_3 gt Cl gt NO_2`
Discussion
12.

The translational kinetic energy of 10^(20) molecules of nitrogen at a certain temperature is 0.629J. What is the temperature in .^(@)C?

Answer»

`43.3^(@)C`
`23^(@)C`
`30.^(@)C`
`15.8^(@)C`

ANSWER :c
Discussion
13.

Write the Lewis dot symbol for Si and P.

Answer»

Solution :The NUMBER of valence electons in Si is 4.
LEWIS dot structure is `.UNDERSET(.)overset(.)(Si).`
The number of electrons in the valence SHELL of P is 5.
The Lewis dot structure of P is `(.)underset(.)overset(.)(P).`
Discussion
14.

List the uses of sodium hydroxide.

Answer»

Solution :SODIUM hydroxide is used as LABORATORY reagent.
(ii) It is used in the purification of bauxite and petroleum refining.
(III) It is used in the textile industries for mercerising cotton FABRICS.
(iv) It is used in the manufacture of soap, paper, artificial silk and a number of CHEMICALS
Discussion
15.

Thevapour pressureof waterat 300Kin aclosedcontaineris 0.4 atm. Ifthe volumeofthe containeris doubled , itsvapourpressureat300 Kwill be _____.

Answer»

0.8 ATM
0.2 atm
0.4 atm
0.6 atm

ANSWER :A::C::D
Discussion
16.

What effect does branching of an alkane chain has on its boiling point ?

Answer»

Solution :In ALKANE as the CHAIN INCREASES, boiling POINT decreases.
Discussion
17.

Whena liquid boils , there is ___ in entropy.

Answer»

SOLUTION :INCREASE
Discussion
18.

What is the correct order of decreasing stability of the following cations? underset((I))(CH_(3)- overset(oplus)(C )H-CH_(3)) " "underset((II))(CH_(3) - overset(oplus)(C )H-OCH_(3)) " "underset((III))(CH_(3) - overset(oplus)(C )H-CH_(2)-OCH_(3))

Answer»

`II GT I gt III`
`II gt III gt I`
`III gt I gt II`
`I gt II gt III`

Solution :
Thus jthe stability of carbocation DECREASES in the ORDER: `(II) gt (I) gt (III)`
Discussion
19.

Water gas is ...........

Answer»

`H_(2)O_((G))`
`CO+H_(2)O`
`CO+H_(2)`
`CO+N_(2)`

ANSWER :C
Discussion
20.

What is reduction reaction ? Give its examples.

Answer»

SOLUTION :.Removal of oxygen/electronegative element from a substance or addition of hydrogen/ electropositive element to a substance is known as rduction."
`2HgO_((s))to2Hg_((l))+O_(2(g))`
Oxygen removed from MERCURIC oxide.
`2FeCl_(3(aq))+H_(2(g))to2FeCl_(2(aq))+2HCl_((aq))`
Chlorine remove from ferric chloride.
`CH_(2)=CH_(2(g))+H_(2(g))toCH_(3)*CH_(3(g))`
(Addition of hydrogen in ethene)
`2HgCl_(2(aq))+SnCl_(2(aq))toHg_(2)Cl_(2(s))+SnCl_(4(aq))`
(Addition of Hg in `HgCl_(2)`)
Discussion
21.

Zinc can be coated on ironto produce galvanized iron but thereverse is not posible it is because

Answer»

zincis lighter than iron
zinc has lowr melting point than iron
zinc has lower negativ ELECTRODE point than iron
zinc has higher negative electrode potential than iron

SOLUTION :A metal with more negative electrode potential is more easily oxidised than a metawith LESS negative electrode potential thus zinc with `E^(@)=-0.76 V` is more easily oxidised by `O_(2)` and moisture of the ATMOSPHERE than iron with`E^(@)=-0.44 V` and thus protects iron from corrosionwith les -ve electrode potential cannot protect zinc with more ve electrode potential from CORROSION
Discussion
22.

What is syn gas? How it is prepared?

Answer»

SOLUTION :The MIXTURE of CO and `H_2` GASES are called syn GAS.
PREPARATION: `C+H_(2)O rarr CO +H_2`
Discussion
23.

Which of the following compounds(s) is/are paramagnetic

Answer»

`KO_(2)`
` RbO_(2)`
`TiO_(2)`
`SiO_(2)`

Solution :DUE to the PRESENCEOF unpairedelectrons in `O_(2)^(-)`ion in `KO_(2)` and `RbO_(2)`they re PARA magneitc
Discussion
24.

Under which of the following two condition applied together, a gas devites most from the ideal behaviour ?

Answer»

LOW pressure
High pressure
Low temperature
High temperature

Solution :A gas DEVIATES from IDEAL behaviour when pressure is high or temperature is low.
Discussion
25.

When maximum amount of solute is dissolved in a solvent at a given temperature, the solution is called………………

Answer»

SOLUTION :SATURATED solution
Discussion
26.

Which of the following molecules is polar and possesses zero dipole moment ?

Answer»

`Cl_(2)`
`BF_(3)`
`NH_(3)`
HCl

Solution :`BF_(3)`

The shape is triangular planar , F - B - B = `120^(@), MU =0` D
In `BF_(3)` molecule, there are three polar B - F bo nds PRESENT because the electronegativity of F(4 .0) is more then B(2.0) but hybridization of B in `BF_(3) ` is `sp^(2) ` so the shape is triangular planer.
B - F bond is planar but it has regular shape . All vector component each other so it is NON polar.
Discussion
27.

Which of the following has common formula C_(n)H_(2n) ?

Answer»

Alkane
Alkene
Alkyne
Cycloalkene

Answer :B
Discussion
28.

What is bond energy? Why is it called enthalpy of atomisation ?

Answer»

Solution :Bond ENERGY is the AMOUNT of energy requiredto dissociate one moleof bonds PRESENT between the atoms in the gaesous MOLECULES. As the molecules dissociate completely into atoms in the gaseousstate, therefore, bond energy of a diatomic molecule is called enthalpy of ATOMISATION.
Discussion
29.

Write the conjugate acids for the following Bronsted bases : NH_(2)^(-), NH_(3) and HCO O^(-)

Answer»

SOLUTION :Conjugate ACID = Bronsted BASE + `H^(+)`
`:.` Conjugate ACIDS of `NH_(2)^(-), NH_(3) and HCO O^(-) ` will be `NH_(3), NH_(4)^(+)` and HCOOH respectively.
Discussion
30.

When the absolute temperature of a gas is doubled then the correct statements are a) The V of a gas increases by 4 times at constant P b) The P of a gas increases by 2 times at constant V c) The V of a gas increases by 2 times at constant P d) The P of a gas increases by 4 times at constant V

Answer»

b,d
a,c
b,c
a,d

Answer :C
Discussion
31.

Which of the following carbocation is most stable ? (a) (CH_(3))_(3)C overset(+)(C)H_(2) (b) (CH_(3))_(3)overset(+)(C)(c) CH_(3)CH_(2)overset(+)(C)H_(2)(d) CH_(3)overset(+)(C)HCH_(2)CH_(3)

Answer»

Solution :The order of STABILITY of carbocation is : `3^(@) gt 2^(@)gt 1^(@)`
(a) `UNDERSET(1^(@) " Carbocation")((CH_(3))_(3)C - overset(+)(C)H_(2))` (b) `underset(3^(@) "Carbocation")((CH_(3))_(3)overset(+)(C))` (c) `underset(1^(@) "Carbocation")(CH_(3)CH_(2)overset(+)(C)H_(2))`(d) `underset(2^(@) "Carbocation")(CH_(3)overset(+)(C)HCH_(2)CH_(3))`
Since `3^(@)` carbocations are the most stable, therefore, option (b) is CORRECT.
Discussion
32.

Which sysyematic diagram reprsents the correct sequence of Solvay process

Answer»




Solution :Solvay process
`NH_(4)OH+_CO_(2)rarrMH_(4)HCO_(3)`
`2NaAHCO_(3)UNDERSET(triangle)rarNa_(2)CO_(3)+H_(2)O+CO_(2)`
Discussion
33.

Which one is a wrong statement?

Answer»

the uncertainty principle is `DeltaE xxDeltat ge(h)/(pi)`
half-filled and fully filled orbitals have greater stability due to greater EXCHANGE energy, greater symmetry and more balanced arrangement
the energy of 2s-orbital is less than the energy of 2p-orbital in case of hydrogen-like atoms
de Broglie's wavelength is given by `LAMDA=(h)/(mv)`, where m=mass of the particle, v=group VELOCITY of the particle

Solution :For hydrogen like atom, energy of the orbital depends on the principal quantum number. THUS for hydrogen like atom, energy of 2s and 2p orbitals are same.
Discussion
34.

True statement about this compound cornane is/are :

Answer»

It is having `C_(3)` axis of symmetry
It is having `C_(6)` axis of symmetry
It is having `S_(3)` ALTERNATIVE axis of symmetry
It is having `S_(6)` alternative axis of symmetry

Solution :
Rotate by `60^(@)` forms MIRROR IMAGE `(S_(6)).`
Discussion
35.

Which of the following contains the least number of molecules ?

Answer»

0.5 G atom of Zn
0.645g of Zn
0.25 MOLE of Zn
`6.45 XX 10^(20)` amu of Zn

Answer :D
Discussion
36.

The reagent used to convert Ethanoic acid to Ethanol is

Answer»

`LiAlH_(4)`
`BH_(3)`
`PCl_(3)`
`K_(2)Cr_(2)O_(7)//H^(+)`

Solution :`CH_(3)COOH+4[H] UNDERSET(-H_(2)O)OVERSET(LiAlH_(4))rarr CH_(3)CH_(2)OH`.
Discussion
37.

Which of the following is Dobereiner triad

Answer»

LI, Na, K
Fe, Co, NI 
Ru, Rh, PD 
Os, Ir, PT 

Answer :A
Discussion
38.

Which of the folowing statements are correct

Answer»

`H_(2)O_(2)` reduces `MnO_(4)^(-)` both in ACIDIC and basic media
`H_(2)O_(2)` oxidises `Fe^(2+)` both in acidic and basic media
`H_(2)O_(2)` oxidises `Mn^(2+)` ions in basic media
`H_(2)O_(2)` liberates `I_(2)` from acidified KI SOLUTION and reduces `I_(2)` to `I^(-)` ions in basic media

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

Using the standard electrode potentials given is the Table 1 predict if the reaction between the following is feasible : (a) Fe^(3+)(aq) and I^(-) (aq) (b) Ag^(+) (aq) and Cu(s) (c) Fe^(3+) (aq) and Cu(s) (d) Ag(s) and Fe^(3+)(aq) (e) Br_2(aq) and Fe^(2+) (aq) .

Answer»

Solution :(a) It is CLEAR from the table that electrode potential `Fe^(3+)|Fe` (0.77V) is more than that of `I_2|I^(-) (0.54V)`, therefore , `Fe^(3+)` will be READILY reduced and the following reaction is feasible.
`Fe^(3+)(AQ) +I^(-) (aq) rarr Fe^(2+) (aq) +1/2I_2(s)`
(b) The electrod potential of `AG^(+) |Ag` (0.80V) is more than that of `Cu^(2+)|Cu` (0.34V ) and therefore , `Ag^(+)`will be reduced by COPPER . The following reaction is feasible.
`2Ag^(+) (aq) +Cu(s) rarr 2Ag(s) +Cu^(2+) (aq)`
(c) The electrode potential of `Fe^(3+)|Fe^(2+)` (0.77V) is more than that of `Cu^(2+)|Cu` (0.34V), therefore , `Fe^(3+)` can be reduced . The following reaction is feasible .
`2Fe^(3+)(aq) +Cu(s) rarr 2Fe^(2+)(aq) +Cu^(2+) (aq)`
(d) The electrode potential of `Ag|Ag^(+)` (0.80V) is more than that of `Fe^(3+)|Fe` (0.77V) and therefore`Ag^+` will not be reduced by `Fe^(3+)` . Therefore , the reaction will not be feasible.
`Ag(s) +Fe^(3+)(aq) rarr Ag^(+) (aq) +Fe^(2+) (aq)`
(e) The electrode potential of `Br | Br^(-)` (1.09V) is more than that of `Fe^(3+)|Fe^(2+)` (0.77V) and therefore , Br will be able to reduce by `Fe^(3+)` . Therefore , the following reaction is feasible.
`1/2 Br_2(aq) +Fe^(2+)(aq)rarrBr^(-) (aq) +Fe^(3+)(aq)`
Discussion
40.

Which is the correct order of atomic sizes (At. No: Ce=58, Sn=50, Yb=70 and Lu=71)

Answer»

Ce GT Sn gt YB gt LU 
Sn gt Ce gt Yb gt Lu 
Lu gt Yb gt Sn gt Ce
Sn gt Yb gt Ce gt Lu 

ANSWER :D
Discussion
41.

What is the magnetic character of the anion of KO_(2) ?

Answer»

Solution : Anion of `KO_(2) = O_(2)^(-)`(superoxide ion) which has one UNPAIRED ELECTRON and HENCE in PARAMAGNETIC.
Discussion
42.

When salicylic acid is heated with Zn dust. What is the main product?

Answer»

Benzene
Phenol
Toluene
Benzoic acid

Solution :
Discussion
43.

Which requires catalyst

Answer»

`S+O_(2)toSO_(2)`
`2SO_(2)+O_(2)to2SO_(3)`
`C+O_(2)toCO_(2)`
All

Solution :`UNDERSET((G))(2SO_(2))+underset((g))(O_(2))underset("ASBESTOS (promoter)")overset("At Catalyst")to2SO_(3)(g)`
Discussion
44.

Which statement( s) is arefalse for theperiodicclassificationof element ?

Answer»

Theproperties of the element are theperioicfunctions of thetheiratomic number .
Non- metallicelement areleasser innumberthan thtemetallicelements
the firstionization energiesof the elementsalong a perioddo not varyina regularmannerwith increasein ATOMIC number
Fortransitionelements the d- elementsarefilledmonotonically WITHINCREASE inatomicnumber

Solution :In v (Z =23) , Itis `d^(3) , ` Cr (z=24) it is `d^(7)`
inNi(Z= 28 ) , it is `d^(8)` , in Cu (Z=29)it is`d^(10)`
andin Zn (Z= 30)it isalso `d^(10)`. Thusd- electrons
are notfilledmonotonically.Thusoption(d ) iswrong . Option( c) isalsowrongbecause`Delta_(i)H_(1)` OFTHE elementsin aperiodvaryregularly .
Discussion
45.

When sodium and chlorine react energy is

Answer»

Released and IONIC BOND is formed
Released and COVALENT bond is formed
ABSORBED and covalent bond is formed
Absorbed and ionic bond is formed

Solution :Between Na and Cl ionic bond is formed and bond FORMATION is exothermic.
Discussion
46.

Which of the followingstatements are correct regarding hydrogen? (i) The largest single use of dihydrogen is in the synthesis of NH_(3) which is used in the manufacture of HNO_(3) and nitrogenous fertilizers. (ii) It is used to reduce heavy metal oxide (iii) It is used as rocket fuel. (iv) Atomic hydrogen and oxy hydrogen torches find use for cutting and welded to purpose.

Answer»

i,III
i,II
i,ii,iv
i,ii,iii,iv

Answer :D
Discussion
47.

Which one is most reactive towards S_(N) 1 reaction ?

Answer»

`C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br`
`C_(6)H_(5)CH_(2)Br`
`C_(6)H_(5)CH(C_(6)H_(5))Br`
`C_(6)H_(5)CH(CH_(3))Br`.

SOLUTION :For `S_(N)1` reactions, more stable is the carbocation, more reactive the alkyl or aryl HALIDE. The STABILITY of CARBOCATIONS increases in the order :
`C_(6)H_(5) overset(+)CH_(2) lt C_(6)H_(5)overset(+)CHCH_(3) lt C_(6)H_(5)overset(+)CHC_(6)H_(5) lt C_(6)H_(6)overset(+)C(CH_(3))C_(6)H_(5)`
Since (a) forms the most stable carbocation, it is most reactive.
`underset("(Most reactive)")(C_(6)H_(5)-underset(CH_(3))underset(|)overset(C_(6)H_(5))overset(|)C-Br) overset(-Br^(-))to underset("(Most stable carbocation)")(C_(6)H_(5)-underset(CH_(3))underset(|)overset(C_(6)H_(5))overset(|)(C^(ox)))`
Discussion
48.

Whichelementhaselectronconfiguration1s^(2) 2s^(2) 2p^(2) ?

Answer»

SOLUTION :C (CARBON )
Discussion
49.

Which of the following mixtures can act as buffer?

Answer»

`H_2CO_3+ NaOH (1.5 : 1` MOLAR ratio)
`H_2CO_3+NaOH (1.5 : 2 `molar ratio)
`NH_4OH + HCl (5 : 4` molar ratio)
` NH_4OH +HCl (4: 5` molar ratio)

Solution :` {:(H_2CO_3 +, NaOH , to NaHCO_3+H_2O ) ,(1.5M , 1M, 0),(1.0, -, 1M),( 0.5M,, ):}`
guffer is FORMED
(b)` {:( H_2CO_3 + , NaOH to ,NaHCO_3+H_2) , ( 1.5M , 2M, 0),( -, 1.5M , 1.5 M),( , 0.5 M , ):}`
` {:( NaHCO_3+ , NaOH to , Na_2CO_3+H_2O ),( 1.5 M, 0.5 M , 0 ),( 0.5 M ,- , 0.5 M),( 1.0 M,, ) :}`
buffer is formed
( C) ` {:( NH_4 OH +, HCl to, NH_4Cl + H_2O ),( 5M, 4M, 0),(4M, -, 4M),( 1M,, ):}`
(d)ACID is excess
Discussion
50.

what is 'Z' above reaction

Answer»

Chloral
chloroform
iodoform
chloro acetone

Answer :2
Discussion