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.

(vii) H_(2)C_(2)O_(4) +KMnO_(4)+H_(2)SO_(4)to H_(2)SO_(4)+MnSO_(3)+CO_(2)+H_(2)O.

Answer»

Solution :
Equalise the INCREASE/ decrease in O N by multiplaying Cu species by 5 and Mn species by 1
`5H_(2)C_(2)O_(4)+KMnO_(4)+H_(2)SO_(4)to K_(2)SO_(4)MnSO_(4)+5CO_(2)+H_(2)O` Balance all other atoms except H and O atoms
`5H_(2)C_(2)O_(4)+2KMnO_(4)+3H_(2)SO_(4)to K_(2)SO_(4) +2MnSO_(4)+10CO_(2)+H_(2)O`
Balance O ATOM by adding `H_2O` on the side falling SHORT of oxygen atoms.
`5H_(2)C_(2)O_(4)+2KMnO_(4)+3H_(2)SO_(4)to K_(2)SO_(4)+2MnSO_(4)+10CO_(2)+H_(2)O+7H_(2)O`
The balanced equation in
`5H_(2)C_2O_(4)+2KMnO_(4)+3H_(2)SO_(4)to K_(2)SO_(4)+2MnSO_(4)+10CO_(2)+8H_(2)O`.
Discussion
2.

Use the periodictable toanswerthe followingquestions (a)Identify anelement with fiveelectrons in the outersubshell. ( b)Identifythe elementthat wouldtend to lose twoelectrons. ( c) Identifythe elementthat wouldtend to gain twoelectrons ( d)Identifythe grouphavingmetal non - metalliquid as well as gas at room temperature

Answer»

Solution :(a) The generalelectronicconfigurationof the elementshavingfiveelecrons in theoutersubshell is `ns^(2) np^(5)` . Thiselectronicconfigurationis CHARACTERISTIC of element of GROUP 17, i.e.,halogensand theirexamplesare F, Cl, Br,I ,At , etc.
( b)the elements whichhave atendencyto losetwo elementmust havetwoelectrons in thevalenceshell.Thereforetheirgeneralelectronicconfigurationshouldbe `n s^(2)`. Thiselectronicconfigurationis characterisitic ofgroup 2elements i.e.,alkalineearthmetalsand theirexampleare Mg ,CA, Sr, BA, etc
( c)the elementwhichhavea tendencyto accepttwo electronsmust havesixelectronicin the valence shell. thereforetheirgeneralelectronicconfiguration is `ns^(2) np^(4)` . thiselectronicconfigurationcharacteristicofgroup16 elements and theirexampleare Oand S.
( d)A metalwhich isliquidat roomtemperatureis mercury. It istransitionmetaland belongs to group 12A non- metal whichis gas itroomtemperatureishydrogen( group 1) . nitrogen (group 15) , oxygen ( group 16) , fluorinechlorine( group 17)and inertgases( group 18) .
A non- metalwhich is a liquid at roomtemperatureis bromine( group 17).
Discussion
3.

The value of DeltaG^(@) for a reaction is 7.97 KJ//"mole". Its equilibrium constant K_(c) at 298K is 4 xx 10^(-x) What is x?

Answer»


Solution :`Delta G^(@)= -RTlnK`
`LOG K = -1.4= -2+0.6=log(4 XX 10^(-2)) IMPLIES K=2`
Discussion
4.

Which of the following is a rare earth element?

Answer»

OXYGEN
Magnesium
Calcium
Sulphur

Answer :C
Discussion
5.

Which of the following functional group can not be reduced to alcohol using sodium borohydride in the anolic solution ?

Answer»

RCHO
`R-CO-R`
RCOOH
RCOCl

Solution :`NaBH_(4)` does not REDUCE `-COOH` GROUP.
Discussion
6.

The set representing the correct order of first ionisation potential is…

Answer»

`K gt Na gt Li`
`Be gt Mg gt Ca`
`B gt C gt N`
`Ge lt SI gt C`

SOLUTION :`1^(ST)` I.P. decreases down the group .
Discussion
7.

Which one of the following is true?

Answer»

Lithium on DIRECT combination with nitrogen to FORM `Li_3N`
Magnesium on direct combination with nitrogen to form `Mg_3N`
Both (a) and (B)
Lithium and magnesium form bicarbonates

Solution :KCl is also CALLED as MURIATE of Potash.
Discussion
8.

Which one is the most acidic compound ?

Answer»

`NiCl_2`
` FeCl_2`
`AlCl_3`
`BeCl_2`

Solution :CATION with more CHANGE UNDERGOES more EXTENT of hydrolysis
Discussion
9.

The solubility of AgCl in 0.1M NaCI is (K_(sp) " of AgCl" = 1.2 xx 10^(-10))

Answer»

`0.1 M `
` 1.2 XX 10 ^(-5) `
` 1.095 xx 10 ^(-5)`
` 1.2 xx 10 ^(-9) `

SOLUTION :`AGCL hArr AG^(+) +Cl^(-) `
` "" s "" 0.1`
`KSP= 5 xx 0.1 rArr S =1.2 xx 10 ^(-9) `
Discussion
10.

Two rigid adiabatic vessels A and B which initially, contain two gases at different temperature are connected by pipe line with value of negligible volume. The vessel 'A' contain 2 moles Ne gas (C_(p.m) = (5)/(2)R) at 300K, vessel 'B' contain 3 moles of SO_(2) gas (C_(p.m) = 4R) at 400K. The volume of A & B vessel is 4 and 6 litre respectively. The final total pressure (in atm) when value is opened and 12 Kcal heat supplied through it to vessels. [Use: R= 2 cal/mol, K and R= 0.08L. atm/mol K as per desire]

Answer»

3.5 atm
7 atm
35 atm
70 atm

Solution :This TOTAL process was carried out at constant volume. So we have to use speciphic heat at constant volume. So after the opening of the value INITIALLY both gases attain same temperature T as per the following equation
`2 (3)/(2) R (T - 300) = 3 xx 3R (400-T)`
On solving T= 375
Again temperature will be INCREASES to `T^(1)` due to the supply of 12K. Cal of heat as follows:
`2 xx (3)/(2) R (T^(1) - 375) + 3 xx 3R (T^(1) - 375) = 12000`
On solving `T^(1) = 875`
So, `P = (5 xx 0.08 xx 875)/(10) = 35` atm
Discussion
11.

Which of the following is correct representatin of the reaction when BF_(3) reacts with ammonia? (i) F - underset(F)underset(|)overset(F)overset(|)(B) + underset(H)underset(|)overset(H)overset(|)( :N) - H to [F - underset(F)underset(|)overset(F)overset(|)(B) to underset(H)underset(|)overset(H)overset(|)( :N) - H] (ii) F - underset(F)underset(|)overset(F)overset(|)(B) + underset(H)underset(|)overset(H)overset(|)( :N) - H to [F - underset(F)underset(|)overset(F)overset(|)(B) to underset(H)underset(|)overset(H)overset(|)(N) - H]

Answer»

(i) is INCORRECT and (II) is CORRECT
(i) is correct and (ii) is incorrect
Both (i) and (ii) are correct
Both (i) and (ii) are incorrect

Answer :B
Discussion
12.

The structures of beryllium chloride in the solid state and vapur phase, respectively, are:

Answer»

CHAIN and chain
DIMERIC and dimeric
dimeric and chain
chain and dimeric.

Solution :chain and dimeric.
Discussion
13.

What is the coordination number in a square close packed structure in htwo dimensions ?

Answer»

2
3
4
6

Answer :D
Discussion
14.

Whch one of the following substances is used to reactivate the de activated filters in activated carbon method for defluoridation ?

Answer»

Defluoron -I
`CaCOCl_(2)`, lime and ALUM
4% NAOH solution and then 1% `H_(3) PO_(4)` solution
4% NaCI solution and then 5% `H_(2) SO_(4)` solution.

Answer :C
Discussion
15.

What is called Bond Length? Name the techniques through which the length of a bond can be determined

Answer»

Solution :The distance between the nuclei of two COVALENTLY bonded atoms is called bond length, For e.g., in a covalent MOLECULE A - B, the bond length is EQUAL to the sum of the radii of bonded atoms,i,e .. `gamma_(A)+gamma_(B)` = bond lenght
The length of a bond can be determined by spectroscopic, x-ray DIFFRACTION and electron- diffraction techniques
Discussion
16.

Two bubbles of different radii are connected by a hollow tube, then

Answer»

SMALLER bubble gets smaller, larger gets larger
smaller bubble gets larger and larger gets smaller
no change takes place
both gets larger and ultimately burst

Solution :Pressure in the two BUBBLES will become EQUAL. In order to do so, the larger bubble will become smaller and the smaller bubble will become LARGE
Discussion
17.

Which of the following is independent of temperature of a gas

Answer»

Density 
RATE of DIFFUSION 
VAPOUR density 
R.M.S velocity 

Answer :C
Discussion
18.

Which of the following statements is correct about inductive effect

Answer»

Implies the TRANSFER of lone pair of ELECTRONS from more ELECTRONEGATIVE atoms to lesser electronegative atom in a molecule
Implies the transfer of lone pair of electrons from lesser electronegative atom to the more electronegative atom in a molecule
INCREASE with increase in distance
Implies the atoms ability to cause bond polarization

ANSWER :D
Discussion
19.

Which of the following will have functional group isomerism?

Answer»

Methanol
Formaldehyde
Methyl ethanoate
Acetaldehyde

Solution :
`:.` FUNCTIONAL GROUP ISOMERISM
Discussion
20.

Which has maximum molar heat of combustion?

Answer»

n-Butane
Isobutane
Propane
Ethane

Solution :HIGHER the number of carbon ATOMS having maximum (2 or 3) hydrogen atoms, higher is the molar heat of combustion, i.e., n-butane.
Discussion
21.

The transition elements have a general electronic configuration:

Answer»

`ns^(2)np^(6)ND^(1-10)`
`(n-1)d^(1-10)ns^(0-2)np^(0-6)`
`(n-1)d^(1-10)ns^(1-2)`
none

Answer :C
Discussion
22.

Which of the following carbocation will be most stable ?

Answer»

`Ph_(3)C_(-)^(+)`
`CH_(3)-OVERSET(+)CH_(2)-`
`(CH_(3))_(2)-overset(+)CH`
`CH_(2)=CH-overset(+)CH_(2)`

Answer :A::C
Discussion
23.

What is the relationship betwee the eV and the wavelength in metre of the energetically equivalent photons?

Answer»


ANSWER :`lamda=12.4237xx10^(-7)` METRE.
Discussion
24.

The uncertainty in the position of a moving bullet of mass 10g is 10^(-5).Calculate the uncertainty in its velocity?

Answer»

SOLUTION :Acooding to uncertainty PRICIPLE,
`/_\x.m/_\v=h/(4PI)or /_\v=h/(4pim/_\x),h=6.626xx10^(-34)KGM^(2)kgm^(2)s^(-1),m=10g=10^(-2)kg`
`/_\x=10^(-5)m,/_\v=((6.626xx10^(-34)kgm^(2)s^(-1)))/(4xx3.143xx(10^(-2)kg)xx(10^(-5),m))=5.27xx10^(-28)mv`
Discussion
25.

Which chemistry is involed in production of chemicals without damaging the environment ?

Answer»

Yellow CHEMISTRY
Ideal chemistry
GREEN chemistry
PURE chemistry

Answer :C
Discussion
26.

What effect doesbranching of an alkene chain has on its boiling point ?

Answer»

Solution :As the branching INCREASES , the surface area of an alkeneapproaches that of a sphere. Since, a sphere has minimum surface area, therefore, VAN der Waals FORCES of attraction are minimum and HENCE the BOILING point of the alkane decreases with branching.
Discussion
27.

Which of the following order is incorrect w.r.t. property indicated ?

Answer»

`UNDERSET(("ACID STRENGTH"))("Formic acid " gt " Acetic acid") gt "Propionic acid"`
`underset(("ACID STRENGTH"))("Cyclohexanol " lt " Phenol " lt "BENZOIC acid")`
`underset(("ACID STRENGTH"))("Benzamide " lt " Aniline " lt " Cycohexylamine")`
`underset(("ACID STRENGTH"))(FCH_(2) COOH gt ClCH_(2)COOH gt BrCH_(2)COOH)`

Solution :The ANSWER are based upon the REACTIONS given in Comprehensve Review.
Discussion
28.

Which of the following does not result in an increase in the entropy?

Answer»

CRYSTALLISATION of SUCROSE from SOLUTION
RUSTING of iron
Conversion of ice to water
Vapourisation of camphor

Solution :Crystallisation of sucrose from solution
Discussion
29.

Which of the following is not the consequence of H-bonding?

Answer»

Glycerol is more soluble in WATER than ethanol.
BOILING point of `C_(2)H_(5)OH` is HIGHER than `CH_(3)-O-CH_(3)`.
p-nitrophenol has higher boiling point than o-nitrophenol
HCl is water soluble due to H-bonding

Answer :D
Discussion
30.

What is pK_(w) ? What is its value of 25^(@)C ?

Answer»

SOLUTION :`pK_(w) = - LOG K_(w) = - log 10^(-14) = 14`.
Discussion
31.

Which postulate of kinetic theory can be used to justfy Dalton's law of partial pressures ?

Answer»

SOLUTION :No, TEMPERATURE is LOWERED during ADIABATIC EXPANSION.
Discussion
32.

Which one is true from the following ?

Answer»

`(p_(1)T_(1))/(V_(1))=(p_(2)T_(2))/(V_(2))`
`(p_(1)V_(1))/(V_(1)p_(1))=(T_(1))/(T_(2))`
`(p_(1)V_(1))/(p_(2)V_(2))=(T_(1))/(T_(2))`
`(V_(1)V_(2))/(p_(1)p_(2))=(T_(2))/(T_(1))`

ANSWER :C
Discussion
33.

Write short note on the following bond parameter . Bond enthalpy

Answer»

Solution :Bond enthalpy : The bond enthalpy is DEFINED as the minimum AMOUNT of energy required to BREAK one mole of a PARTICULAR bond in molecules in their gaseous state . The unit of bond enthalpy is KJ `mol^(-)`.
Discussion
34.

Which of these is least likely to act as a Lewis base ?

Answer»

`PF_(3)`
`CO`
`F^(-)`
`BF_(3)`

Solution :`BF_(3)` is a LEWIS acid.
Discussion
35.

What is laughing gas ? How is it prepared ?

Answer»

SOLUTION :`N_(2)O`. It is PREPARED by HEATING ammonium nirate, i.e., `NH_(4)NO_(3)overset(Delta)toN_(2)O+2H_(2)O`.
Discussion
36.

When acidified k_(2)Cr_(2)O_(7)O_(7)spitopm os added tp Sm^(2+) salts then Sn^(2+) salt then Sn^(2+) changes to

Answer»

SN
`Sn^(3+)`
`Sn^(4+)`
`Sn^(+)`

ANSWER :C
Discussion
37.

Which of the following is not an non-ideal solution showing positive deviation?

Answer»

Benzene & acetone
`C Cl_(4) & CHCl_(3)`
Acetone & ethyl alcohol
Benzene and toluene

Answer :D
Discussion
38.

The shape of CH_(3)^(-) is......................while that of CH_(3)^(+) is................. .

Answer»


ANSWER :PYRAMIDAL, PLANAR
Discussion
39.

What is the role of gypsum in cement ?

Answer»

Solution :Gypsum decreases the rate of SETTING of cement . It increase the time required for setting of cement . Various silicates presentin the form of gels in the cement are SLOWLY converted to a hard MASS in the presence of added gypsum .
Discussion
40.

Which orbitals of the following are overlapped and form sigma bond ? 1s - 1s, 2s - 2s, 1s - 2s, 2p_(x) - 2p_(x) , 2p_(y)- 2p_(y) , 2p_(z) - 2p_(z)

Answer»

SOLUTION :`SIGMA` -bond is FORM by FOLLOWING overlapping
1s - 1s, 2s - 2s , 1s-2s, `2p_(z) - 2p_(z) `
`sigma`-bond is not formed by overlapping of `2p_(y)- 2p_(y) and 2p_(x) - 2p_(x)`.
Discussion
41.

Which of the following is the electron deficient molecule ?

Answer»

`C_(2)H_(6)`
`SiH_(4)`
`PH_(3)`
`B_(2)H_(6)`

SOLUTION :`B_(2)H_(6)` is ELECTRON deficient.
Discussion
42.

Write the IUPAC names of the products obtained by the ozonolysis of the following compouds : l-phenyl but-1-ene

Answer»

SOLUTION :
Discussion
43.

What is the formula of gypsum ? What happens when it is heated ?

Answer»

Solution :`CaSO_(4) . 2H_(2)O` . When heated to 393 K , it GIVES Plaster to Paris `(CaSO_(4). 1//2 H_(2)O)` but at 473 K it gives DEAD burnt plaster `(CaSO_(4))` .
Discussion
44.

The trans-alkenes are formed by the reduction of alkynes with :

Answer»

`H_(2)-Pd//c BaSO_(4)`
`NaBH_(4)`
Na/liq. `NH_(3)`
Sn-HCl

Answer :C
Discussion
45.

Which of the following process used in water gas shift reaction

Answer»

MERCK's process
Lane'sprocess
PERMUTIT process
BOSCH's proces

Solution :`C +H_2O underset(NI)overset(1273K)TOCO + H_2 overset(FeCrO_4)to CO_2+2H_2` (Bosch.s process)
Discussion
46.

Which of the following types of reactions majorly occur when a reactant has a double bond?

Answer»

Addition
Substitution
Elimination
Photolysis

Answer :A
Discussion
47.

Which of the following statements concerning the quantum numbers are correct ?

Answer»

Angular quantum num ber DETERM ines the three DIM ensional shape of th e orbital.
The principal quantum num ber determ ines the orientation and energy of the orbital.
M agnetic quantum num ber determ ines the SIZE of th e orbital
Spin q u a n tu m n u m b e r of an e lectro n determ ines the orientation of the spin of electron relative to th e chosen axis.

Solution :(A) Azim uthal quantum num ber ‘Z’ isdimensional shape of the orbital. (B) The principal quantum num ber determ ines the size of the orbit. (C) M agnetic q u an tu m n u m b er d eterm ines the orientation of the electron cloud in a subshell.(D) An electron spins around its ow n axis, m uch in a SIM ilar way as earth spins around its own axis whereas revolving around the sun or, an electron has, besides charge and m ass, intrinsic spin angular quantum number.
Discussion
48.

The structure of isobutyl group in an organic compound is

Answer»

`CH_(3)-UNDERSET(CH_(3))underset(|)(CH)-CH_(2)-CH_(3)`
`CH_(3)-CH_(2)-CH_(2)-CH_(2)nabla`
`CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-`

Solution : is isobutyl GP.
Discussion
49.

The root mean square velocity of an ideal gas at constant pressure varies with density (d) as:

Answer»

`d^(2)`
`d`
`SQRT(d)`
`(1)/sqrt(d)`

ANSWER :d
Discussion
50.

Whichnuclear reactionproduceisotope

Answer»

emissionof NEUTRON
emissionof POSITRON
emissionof `ALPHA` particle
emissionof `beta` particle

ANSWER :A
Discussion