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 is decomposition reaction

Answer»

`2HgO to 2Hg +O_(2)`
`CH_(4)+2O_(2) to CO_(2)+2H_(2)O`
`S+O_(2) to SO_(2)`
`Cl_(2)+2KBr to 2KCl +Br_(2)`

ANSWER :A
Discussion
2.

Write the IUPAC names of the following compounds.

Answer»

SOLUTION :
Discussion
3.

Which element containing Uuh series?

Answer»

104
116
118
12

Solution :`{:("SYMBOL",U,u,H),("Name",UN,un,"hexium"),("Digit",1,1,6):}`
Atomic number = 116
Discussion
4.

Write the structures and IUPAV names of the functional isomers having the molecular formula C_(2)H_(5)O_(2)N.

Answer»

SOLUTION :THREE functional isomers and their IUPAC name are :
Discussion
5.

which of the following processes are accompanied by an increase of entropy . (i) Dissolution of iodine in solvent (ii) HCl added to AgNO_(3) solution and precipitate of AgCl is obtained (iii) A partition is removed to allow two gases to mix.

Answer»

(i) & (II)
(ii) & (III)
(i) & (iii)
all the above

ANSWER :C
Discussion
6.

Which statement is/are correct.

Answer»

No primary KINETIC isotope effect is observed during nitration of BENZENE
`K_H//K_D`=1 for halogenation of benzene
`K_H//K_D`=1 for sulphonation of benzene
`K_H//K_D` is GT 1 for ALKYLATION of benzene

Answer :A::B
Discussion
7.

Which of the following statements are wrong?

Answer»

pH of NEUTRAL water is always7.0
When a base is titrated against an ACID, thepH at the end point is 7.0
Lesser is the pH than 7, more acidic is thesolution and higher the pH than 7, less basic is the solution
AGCL is more soluble in `NH_(3) ` than in water.

Solution :(a) is wrong because PH of neutral water depends upon temperature
(b) is wrong because at the end point, pH depends upon the NATURE of acid and base being titrated
(c) is wrong because higher the pH than 7, more basic is the solution
(d) is correct because AgCl DISSOLVES in `NH_(3) ` to form a soluble complex.
Discussion
8.

Which is the correct sequence of solubility of carbonates of alkaline earth metals ?

Answer»

`BaCO_(3) GT SrCO_(3) gt CaCO_(3)gt MgCO_(3)`
`MgCO_(3) gt CaCO_(3)gtSrCO_(3)gt BaCO_(3)`
`CaCO_(3) gt BaCO_(3) gt SrCO_(3) gt MgCO_(3)`
`BaCO_(3) gt CaCO_(3) gt SrCO_(3) gt MgCO_(3)`

Solution :SOLUBILITY of CARBONATES decreases down the GROUP
Discussion
9.

Write a short note , Van't Hoff equation.

Answer»

SOLUTION :`DeltaG^0=-2.303 RT LOG K_(EQ)`
Discussion
10.

What should be the minimum concentration ofNH_(4)Cl that must be present to prevent precipitation, when 0.01 M NH_(4)OH is added to 0.01 (M)M^(2+) solution? (K_(b) of NH_(4)OH = 1.75' 10^(-5) and K_(sp) of M(OH)_(2) = 44.1' 10^(-13))

Answer»

`0.025 M`
`0.01 M`
`0.25 M`
`0.083 M`

Solution : `{:(NH_(4)CL, rarr, NH_(4)^(+) ,+ OH^(-)),(0.01-x,,b+x,x):}`
`K_(b) = 1.75 xx 10^(-5) = ((b+x)x)/(0.01)`
(`x = 2.1' 10^(-6)` from `K_(sp)` of `M(OH)_(2)`)
`(b xx 2.1 xx 10^(-6))/(0.01) = 1.8 xx 10^(-5)`
`rArr (1.75)/(2.1) xx (10^(-7))/(10^(-6)) = (1.75)/(10) = 0.083 M`
Discussion
11.

What are hybridisation states of each carbon atom in the following compounds ? CH_(2) = C = O, CH_(3)CH= CH_(2), ""(CH_(3))_(2) CO,"" CH_(2) = CHCN"and "HCONH_(2)

Answer»

SOLUTION :
Discussion
12.

What is soda ash ? How it obtained ?

Answer»

Solution :Sodium carbonate DECAHYDRATE commonly known as WASHING soda `Na_(2)Co_(3).10H_(2)O`.
Upon heating, it looses the water of crystallization to FORM monohydrate
Above 373K, the monohydrate becomes COMPLETELY ANHYDROUS and changes to a white powder called soda ash
`Na_(2)CO_(3).10H_(2)O overset(/_\^(@))to Na_(2) CO_(3).H_(2)O + 9H_(2)O`
`Na_(2) CO_(3).H_(2) overset(/_\^(@))to underset(Soda ash)(Na_(2)CO_(3)) + H_(2)O`
Discussion
13.

Which of the pairs of gases diffuse at a slower rate than CO_(2)?

Answer»

`H_2 & He`
`SO_2 & SO_3`
`N_2 and CO`
`N_2 OAND C_3 H_8`

ANSWER :B
Discussion
14.

Which of the following can act as sink for CO_2 and SO_2

Answer»

aqKOH
Plants
SEA WATER
Soil

Solution :Sea water
Discussion
15.

Which atom of H is replaced by Br_(2) in presence of P from an acid :

Answer»

`ALPHA`
`GAMMA`
`beta`
`delta`

Solution :SEE PROPERTIES of acids
Discussion
16.

Which of the following is not a protonic acid ?

Answer»

`SO_(2)(OH)_(2)`
`B(OH)_(3)`
`PO(OH)_(3)`
`SO(OH)_(2)`

SOLUTION :`B(OH)_(3)` is not a protonic acid.
Discussion
17.

Which element do you think would have been named by Seaborg's group.

Answer»

SOLUTION :SEABORGIUM (SG) or UNNILHEXIUM
Discussion
18.

The oxidation number of iron in brown ring complexes +x. What is value of x.

Answer»

Solution :The BROWN ring complex compound is GIVEN as: `[Fe(H_(2)O)_(5)NO] SO_(4)`.
The complex ion is `[Fe(H_(2)O)_(5))NO]^(2+)`
Oxidation number of `H_(2)O` is zero and NO is +1.
Oxidation state of Fe is +1.
Experimentally, the number of UNPAIRED ELECTRONS also support +1 state of Fe (But not +2 state).
Discussion
19.

Which of the following set of quantum numbers belong to highest energy

Answer»

n=4,l=0,m=0,`s=+ 1/2`
n=3,l=0,m=0,`s=+ 1/2`
n=3,l=1,m=1,`s=+ 1/2`
n=3,l=2,m=1,`s=+ 1/2`

Solution :ORBITALS are 4S, 3s ,3P and 3D . Out of these 3d has highest energy
Discussion
20.

What is the IUPAC name of the insecticise DDT? Why is their use banned in most of the countries?

Answer»

SOLUTION :(i) The IUPAC name of the insecticide DDT is `P_(1)P^(1)`-dichloro-dipenyl trichloro ethane.
(ii) Even DDT is an effective insecticide. Not a day it is banned because of its LONG term toxic affects.
(iii) DDT is very PERSISTENT in the environment and it has a high affinity for fatty TISSUES. as a result, DDT gets accumulated in animals tissue fat, in particular that of birds of prey with SUBSEQUENT thinning of their eggs shells and impacting their of reproduction. that is why DDt. is banned in most of the countries.
Discussion
21.

Which of the following reactions is/are feasible:

Answer»

`(i) & (II)`
`(ii),(III) & (IV)`
`(i), (ii) & (iv)`
`(i) ,(iii) & (iv)`

ANSWER :D
Discussion
22.

What isionizationenergyof an atom ?

Answer»

SOLUTION :The energyrequireto moveelectronin `n_(PROP)`orbit is knownas ionization ENERGY
Discussion
23.

What is the integral values can take azimuthal quantum number ?

Answer»

ZERO to N
Zero to n - 1
Zero to n +1
zero to `n^2`

ANSWER :B
Discussion
24.

What will be the minimum pressure required to compress 500dm^(3) of air at 1 bar to 200 dm^(3) at 30^(@)C ?

Answer»

<P>

Solution :`P_(1)=1` bar,`V_(1)=500 dm^(3)`
`P_(2)=?,V_(2)=200 dm^(3)`
As TEMPERATURE remains constant at `30^(@)C`, applying Boyle's law, `P_(1)V_(1)=P_(2)V_(2)`
`1 barxx500 dm^(3)=P_(2)xx200 dm^(3)"or"P_(2)=(500)/(200)bar=2.5 bar`
Discussion
25.

Which of the following names is not correctly written in front of the compound?

Answer»




SOLUTION :The CORRECT NAME of the COMPOUND is 4-chlorotoluene.
Discussion
26.

Which of the following statements is/are incorrect ?

Answer»

Nitrobenzene will give meta-nitrotoluene on reaction with `CH_3Cl//AlCl_3`
Chlorobenzene will give meta-substituted product on electrophilic substitution SINCE it EXERTS -I gt + M effect.
n-Propyl benzene can be easily obtained on Friedral CRAFTS alkylation of benzene with n-propyl chloride.
Toluene can be obtained in better yield when excess of benzene withreact with `CH_3Cl//AlCl_3`.

Solution :(A)In highly de-activated ring Friedal Crafts reaction is not possible.
(B)Chloro group is ortho-para director.
(C )In Friedal Craft reaction the electrophile carbocation rearranges.
(D)To AVOID polyalkylation aromatic substrate is taken in excess.
Discussion
27.

The viscosity of four liquids P, Q, R and S are 85, 11.4, 18 and 12.3 respectively, then which flows slowly

Answer»

<P>P 
Q 
R 
S 

ANSWER :A
Discussion
28.

Which of thefollowingrepresentsthe correctorderof increasingfirstionizationenthalpy for Ca, Ba , S, Se, and Ar ?

Answer»

`Ca lt Ba lt S lt Se lt Ar`
`Ca LTS lg Ba lt Se lt Ar`
`S lg Se lt Ca lt Ba lt Ar `
`Ba lt Ca lt Selt S lt Ar`

Solution :Theionizationenthalpydecreases from TOP to bottomina group(i.e.,`Delta_(i) H_(1) Ca gt Delta_(i)H_(1) Ba :Delta_(i)H_(1) S gtDelta_(i) H_(1) Se)`and increasesfrom leftto rightin a PERIOD (i.e., `Delta_(I) H_(1) S lt Delta_(i)H_(1) Ar)`. Thusthe `Delta_(i) H_(1)` of thefive elementsincreasesin teh ORDER :
`Ba lt Ca lt Se lt S lt Ar `,i.e., option (d) is correct.
Discussion
29.

Which process is suitable for the purification of aniline ?

Answer»

SIMPLE DISTILLATION
STEAM distillation
Fractional distillation
Fractional crystallisation

Solution :ANILINE is PURIFIED by steam distillation.
Discussion
30.

What is the percentage of water of crystallisation in a pure sample of washing soda (Na_(2)CO_(3).10 H_(2)O) ?

Answer»


Solution :Molecular mass of `Na_(2)CO_(3).10H_(2)O=46+12+48+180=286.0u`
PERCENTAGE of WATER of CRYSTALLISATION `= ((180u))/((286u))xx100=62.94%`.
Discussion
31.

Which hybird orbitals are used by carbon atoms in the following molecules?CH_3-COOH

Answer»

SOLUTION :
Discussion
32.

Who had give information of covalent bond ?

Answer»

SOLUTION :KOSSEL & LEWIS has given the octet rule for covalent bond.
Discussion
33.

Which one of the following is non-degradable pollutants ?

Answer»

DDT
Plastic material
Heavy metals
All of these

Solution :All of these
Discussion
34.

Which of the following species is not electrophile in nature ?

Answer»

`Cl^(+)`
`BH_(3)`
`H_(3)O^(+)`
`OVERSET(+)(N)O_(2)`

Solution :`H_(3)O^(+)` cannot act as an electrophile since its OCTET is already complete and hence has no room to accept an additional PAIR of ELECTRONS.
Discussion
35.

When alkyl halides are heated with dry Ag_(2)O they give,

Answer»

DIETHYL ETHER
ester
ketone
aldehyde

Solution :diethyl ether
Discussion
36.

Which of the following electrodes will act as anodes, which connected to Standard Hydrogen Electrode ?

Answer»

`Al//Al^(+3)" "E^(Ө)=-1.66`
`Fe//Fe^(+2)" "E^(Ө)=-0.44`
`Cu//Cu^(+2)" "E^(Ө)=+0.34`
`F_(2(g))//2F_((aq))^(-)" "E^(Ө)=02.87`

Solution :Oxidation POTENTIAL of ELECTRODE is more than, it ACTS as ANODE.
Discussion
37.

Which one of the following is a state function?

Answer»

PRESSURE
Enthalpy
Heat
Both (a) and (B)

ANSWER :D
Discussion
38.

Which of the following will give acetic acid on acid hydrolysis ?

Answer»

ETHYL acetate
acetone
methyl PROPIONATE
LACTIC acid

Answer :A
Discussion
39.

When 5 litres of a gas mixture of methane and propane is perfectly combusted at 0^(@)C and 1 atmpsphere, 16 litres of oxygen at the same temperature and pressure is consumed. The amount of heat released from this combustion in kJ (Delta H _("comb.)) (CH _(4)) = 890 kJ mol ^(-1) , Delta H _("comb.) (C_(3) H _(8)) = 2220 kJ mol ^(-1))

Answer»

38
317
477
32

Answer :B
Discussion
40.

Use of hot air balloon in meteorological observation is based on which gas law ? Explain.

Answer»

Solution :Charles law : According to Charles law, gases expand on heating. Since mass of gas in unchanged, INCREASE in volume DECREASES density. Thus hot air is less dense than COLD air. This causes hot air balloon to rise displacing the COOLER air of the ATMOSPHERE.
Discussion
41.

Why BaSO_(4) is insoluble whereas BeSO_(4) is soluble in water ?

Answer»

Solution :The lattice enthalpy of `BaSO_(4)` is MUCH than its hydration enthalpy and hence it is INSOLUBLE in WATER . But on, the other hand , hydration enthalpy of `BeSO_(4)` is much higher than its lattice enthalpy because of small size of `Be^(2+)` ions . THEREFORE , it is HIGHLY soluble in water .
Discussion
42.

What is the oxidation state ofP in P_4,

Answer»

<P>

SOLUTION :OXIDATION NUMBER of P in `P_4=0`
Discussion
43.

Which of the following compounds does not form an ozonide?

Answer»

ETHANE
Propyne
Propene
Ethene

Answer :A
Discussion
44.

What is shape of theorbital having I - I andm = 0 ?

Answer»

TRIANGULAR plana
Dumbbel
Square plana
Spherical

Answer :B
Discussion
45.

What mass of hydrogen peroxide will be present in 2 litres of a 5 molar solution ? Calculate the mass of oxygen will be liberated by the decomposition of 200 mL of this solution .

Answer»

Solution :Mol. Mass of `H_(2)O_(2)=34 g "mol"^(-1)`
`therefore 1 L` of M solution of `H_(2)O_(2)` will contain `H_(2)O_(2)=34xx5` g
`therefore 2 `L of 5 M solution will contain `H_(2)O_(2)=34xx5xx2=340 g`
or 200 mL of 5 solution will contain `H_(2)O_(2)=(340)/(2000)xx200=34` g
Now`underset(68 g)(2H_(2)O_(2))to 2H_(2)O + underset(32g)(O_(2))`
Now 68 g of `H_(2)O_(2)` on DECOMPOSITION will give `O_(2)=32 g`
`therefore 34 g ` of `H_(2)O_(2)` on decomposition will give `O_(2)=(32)/(68)xx34=16` g
Discussion
46.

Writepostulatesof Bohr.smodelofhydrogenatom

Answer»

Solution :Nells Bohr (1913) was the firstto explainquqntitatively thegeneralfeaturesof hydrogenatomstructure andtisspectrum.
Pitulatesof model:
(i) Theelectron is the HYDROGENATOM can movearoundthenucleusin acircularpathcalledorbitsstationarystatesor allowedenergystates. Theseorbitsare arrangestconcentrically aroundthe nucleus.
(ii) The energyof anelectronin the ORBIT doesnot changewith timeHowever the electron willmovefroma lowerstationarystateto ahigherstationarystatewhenrequiredor ENERGYIS emitted whenelectronmovesdoesnottakeplace in acontinuouschange
(iii) The frequency of radiationabsorbedoremitted whentransitionoccursbetweentwostationarystatesthatdifferin energyby
Where`E_(1)`and `E_(2)`are the energies of lowerand higherallowedenergystatesrespectivelythisexpressionis commonlyknown asbohrfrequencyrule
Thusanelectroncan move only in thoseorbitsfor whichitsangularmomentumisintegralmultiple of `((h)/( 2pi))` that iswhyonlycertain fixedorbitsare ALLOWED.
Discussion
47.

Write equilibrium constants of followingreactions.(1)2PCl_(3(g)) + O_(2(g)) hArr 2POCl_(3(g)) (2)2SO_(3(g)) hArr 2SO_(2(g)) + O_(2(g)) (3) H_2O_((g)) + Cl_2O_((g)) hArr 2HOCl_((g)) (4) CuSO_(4(s)) + 5H_2O_((s)) hArr CuSO_(4(s)) + 5H_2O_((g))

Answer»

SOLUTION :(1)`K_c=[POCl_3]^2/([PCl_3]^2[O_2])`
(2)`K_c=([SO_2]^2[O_2])/([SO_3]^2)`
(3)`K_c=[HOCl]^2/([H_2O][Cl_2O])`
(4)`K_c=[H_2O]^5`
Discussion
48.

What is meant by octet structure?

Answer»

Solution :The ATOMS having 8 electrons in the OUTER most orbit or having valence electronic CONFIGURATION. `ns^(2)p^(6)`.
Discussion
49.

Which of the following compounds will exhibit cis-trans isomerism?

Answer»

2-Butene
2-Butyne
1-Butene
2-Butanol

Answer :A
Discussion
50.

Which one of the following species is stable in aqueous solution?

Answer»

`MnO_(4)^(2-)`
`MnO_(4)^(3-)`
`CU^(+)`
`CR^(2+)`

Answer :A
Discussion