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 is (are) correct for ideal gas ?

Answer»

`((deltaU)/(deltaT))_(P)=0`
`((deltaT)/(deltaP))_(H)=0`
`((deltaE)/(DELTAV))_(T)=0`
`((deltaU)/(deltaP))_(T)=0`

ANSWER :B::C::D
Discussion
2.

The volume of a gas X and chlorine diffusing during the same time are 35 mL and 29 mL respectively. If molecular mass of chlorine is 71, calculate the molecular mass of gas X.

Answer»

Solution :SUPPOSE the molecular weight of the gas X is `M_1` . ACCORDING to Eq. 5.25, we have
`V_1/V_2 =sqrt(M_2/M_1) ""(t_2and t_2` being the same)
In the present CASE,
`V_1 = 35 mL, V_2 = 29 mL, M_1 = ? " and " M_2 = 71`
`:.35/29 sqrt(71/M_1) " or" M_1 = 48.74`
`:.`The Molecular weight of the gas `X =48.74`.
Discussion
3.

Wavelength of an electron is 5Å. Velocity of the electron is

Answer»

`1.45 XX 10^(8) cm//s`
`1.6 xx 10^(-8) cm//s`
`3.2 xx 10^(-27) cm//s`
`3.2 xx 10^(27) cm//s`

ANSWER :A
Discussion
4.

Which period mostly include man made radioactive elements?

Answer»

4 period
7 period
6 period
3 period

Answer :B
Discussion
5.

What is Wurtz reaction? Give example.

Answer»

Solution :When ALKYL halides are heated with sodium metal in ether medium hgiher alkenes are formed. This reaction is KNOWN as Wurtz reaction and employed for the synthesis ofhigher alkanes containig even number of carbon atoms.
`underset("bromethane")(CH_(3)-Br+2Na)+Br-HCH_(3)underset("heat")OVERSET("dryether")(to)underset("ethane")(CH_(3))-CH_(3)+2NaBr`
Discussion
6.

What is the molar solubility of AgCI_((g)) in 0.100M NH_(3(aq.)) ? Given K_(SP) of AgCI = 1.8xx10^(-10), K_(f) of [Ag(NH_(3))_(2)]^(+)= 1.6xx10^(7) .

Answer»


ANSWER :`5.36xx10^(-3)M;`
Discussion
7.

What is the role of chloromethane and dibromoethane when added to gasoline along with tetraethyl lead ?

Answer»

SOLUTION :They CONVERT PBO PRODUCED into VOLATILE `PbCl_2` and `PbBr_2`
Discussion
8.

Write the tautomers of the following compounds.

Answer»


ANSWER :`(##RES_CHM_GOC_II_E01_019_A01##)`
Discussion
9.

Write IUPAC names of the products obtained by addition reactions of HBr to hex-1-ene (i)in presence of peroxide and (ii)in the absence of peroxide.

Answer»

Solution :(i)In PRESENCE of peroxides, anti-Markovnikov's addition occurs and 1-bromohexane is FORMED . <BR> `underset"Hex-1-ene"(CH_2=CH-CH_2-CH_2-CH_2-CH_3+HBr ) underset"(Anti-Mark. addn.)"OVERSET"PEROXIDE"to underset"1-Bromohexane"(undersetunderset(Br)|CH_2-CH_2-CH_2-CH_2-CH_2-CH_3)`
(ii)In absence of peroxides, Markovnikov's addition occurs and 2-bromohexane is formed .
`underset"Hex-1-ene"(CH_2=CH-CH_2-CH_2-CH_2-CH_3+HBr ) underset"(Mark. addn.)"overset"No peroxide"to underset"2-Bromohexane"(CH_3-undersetunderset(Br)|CH-CH_2-CH_2-CH_2-CH_3)`
Discussion
10.

Which one of the following is the wrong statementabout the liquid?

Answer»

It has INTERMOLECULAR force of attraction 
Evapoation of liquids INCREASES with the decrease of surface area 
It resembles a gas near the CRITICAL tempeature 
It is in an intermediate STATE between gaseous and solid state 

Answer :B
Discussion
11.

Which bond angel is same in H_(2)^(+) He_(2)^(-) and He_(2)^(2-)?

Answer»

SOLUTION :BOND ORDER is same in `H_(2)^(+) and He_(2)^(-)`.
Discussion
12.

Which is considered as to be earth protective umbrella? Why?

Answer»

Solution :(i) At high altitude in the atmosphare consists of a layerof ozone `(O_(2))` Which acts as unbrella for harmful UV radiations. Ozone is considered to be EARTH protective umbrella.
(ii) It protects us from harmful effects of UV-radiations of the SUN such as skin cancer.
(III) Ozone layer prevent the UV radiations to reach the earth surface So it acts as an umbrella for the earth.
Discussion
13.

What is not true about the following reaction RCOCl + H_(2) overset(Pd//BaSO_(4) , S)rarr RCHO + HCl

Answer»

It is ROSENMUND's reaction
Sulphur increases the efficiency of the CATALYST Pd
Sulphur decreases the efficiency of the catalyst
Pd is HETEROGENEOUS catalyst

Solution :Sulphur POISONS the catalyst and decreases its efficiency and checks the reduction of aldehyde to ALCOHOL
Discussion
14.

Write short notes on the the following : (i) Raschig process (ii) Dows Process (ii) Darzens process

Answer»

Solution :(i) Raschig process: Chlorobenzene is commercially prepared by passing a mixture of benzene vapour in air and HCL over heated cupric CHLORIDE.

(ii). Dow.s process: Chlorobenzene is boiled with Sodium hydroxide to get Phenol. This reaction is called Dow.s process.
`UNDERSET("Chloro benzene")(C_6H_5Cl) + NaOH underset("350 atm")overset(350^@C)tounderset("Phenol")(C_6H_5OH) + NaCl`
(iii) Darzens process: Ethanol reacts with `SOCl_2` in the presence of PYRIDINE to form chloroethane. This reaction is called Darzens process.
`underset("Ethanol")(CH_3-CH_2OH) + SOCl_2 overset("Pyridine")to underset("Chloroethene")(CH_3CH_2Cl) + SO_2 UARR + HCluarr`
Discussion
15.

Which of the following are non functional in human beings?

Answer»

METHYL propyl ETHER and diethyl ether
2-pentanone & 3-pentanone
propanoic acid and methyl acetate
1-butanol and 2-butanol

Answer :C
Discussion
16.

What are the uses of sodium and its compounds?

Answer»

Solution :Sodium is used to make `Na//Pb` alloy NEEDED to make `Pb(Et)_(4)` and `Pb(Me)_(4)` These organolead compounds were used as anti-knock additives to PETROL in early days
(ii) Liquid sodium metal is used as a coolant in fast breeder nuclear reactors
Discussion
17.

What is concentration of solution ?

Answer»



Solution :The amount of solute in UNIT VOLUME or unit WEIGHT of SOLVENT is called concentration.
Discussion
18.

The relative abundance of three isotopes of carbon C^(12), C^(13) and C^14 are 98.892%, 1.108% and 2 xx 10^(-10)% respectively. If the relative atomic masses of these isotopes are 12.00, 13.00335 and 14.00317 amu respectively, find the average atomic mass of carbon.

Answer»

SOLUTION :Average atomic mass of carbon can be obtained by averaging the relative atomic MASSES of its isotopes in the ratio of their abundance. Thus, Average atomic mass
`(12.000 XX 98.892 + 13.00335 xx 1.108+ 14.00317 xx 2 xx 10^(-10))/(98.892 + 1.108 +2 xx 10^(-10))`
`=12.011` amu
Discussion
19.

Which of the following elements has [Ar]3d^10 4s^2 4p^1electronic configuration ?

Answer»

B
Al
Ga
In

Solution :Ga (Galium) atomic NUMBER 31, having ELECTRONIC arrangement.
Discussion
20.

Write the expression of K_(c) for the reaction N_(2)(g)+3H_(2)(g)hArr2NH_(3)(g). Give units of K.

Answer»

Solution :`K=([NH_(3)]^(2))/([N_(2)][H_(2)]^(3))=((MOLL^(-1))^(2))/((molL^(-1))(molL^(-1))^(3))=L^(2)mol^(-2)`
Discussion
21.

The reagent(s) required for the following conversion are :

Answer»

(i) `NaBH_(4)` (ii) Raney `Ni//H_(2)` (ii) `H_(3)O^(+)`
(i) `LiAIH_(4)` (ii) `H_(3)O^(+)`
(i) `B_(2)H_(6)` (ii) DIBAL-H (III) `H_(3)O^(+)`
(i) `B_(2)H_(6)` (ii) `SnCl_(2)//HCL` (iii) `H_(3)O^(+)`

ANSWER :D
Discussion
22.

X- ray diffraction studies show that copper crystallizes in an fcc unit cell with cell edge of3.608 xx 10^(-8)cm. In a separate experiment, copper is deteremined to have a density of 8.92 g/cm^(3)calculate the atomic mass of copper.

Answer»

Solution :` P = (Z xx M)/(a^(3) xx N_(0))orM = ( p xx a^(3) xx N_(0))/Z`
for fcc LATTICE , Z= 4.
Hence , ` M = (( 8.92 " g cm" ^(-3))( 3.608 xx 10^(-8) cm) ^(3)( 6.022 xx 10^(23)" atoms mol"^(-1))) = 63.1" g mol ^(-1)`
Atomic MASS of copper = `63.1 "g mol"^(-1)`
Discussion
23.

What is the pyrolysis of alkane ? Give reaction.

Answer»

Solution :Defination higher alkanes on heating to higher temperature decompose into lower alkanes, alkenes etc. Such a decomposition reaction into smaller fragements by the application of heat I called pyrolysis or craking.
Higher alkane `underset("Pyrolysis")overset("Higher temperature")rarr (("Lower alkane"),("alkane mixture"))`
Example -1 : Pyrolisis of hexane

Example -2 : Pyrolysis of alkynes is believed to be a free radical reaction. Preparation of oil gas or petrol gas from kerosene oil or petrol involves the principle of pyrolysis. For example, dodecane, a constituent of kerosene oil on heating to 973K in the presence of platinum, palladium or nickel gives a mixture of heptane and pentene.
`underset("Kerosene")underset("Dodecabe")(C_(12)H_(26))underset(973 K)overset("Pd, PT, Ni")rarr underset("(Alkane)")underset("Heptane")(C_(7)H_(10)) + underset("(Alkene)")underset("Pentene")(C_(5)H_(10))+ underset("Products")("Other")`
Thermal combusiton of alkane fission is free radical type reaction. THis type of mixer of HYDROCARBON is mixture of less carbon (Alkane + Alkene)
Discussion
24.

Which of the following has maximum -I effect

Answer»

`-F `
`-NO_(2)`
`-CN`
`-OH^(2)`

SOLUTION :N/A
Discussion
25.

'X' +AgNO_(3) rarr 'Y' (yellowish white ppt) 'Y' is soluble is nitricacid and ammonia. The ppt. becomes yellowish brown upon addition of excess reagent owing to the formation of 'Z'.If aqueous suspension of 'Y' is boiled then it gives the same product 'Z'. Here 'X' and 'Y' are:

Answer»

`CO_(3)^(2-)` and `Ag_(2)O`
`CO_(3)^(2-)` and `Ag_(2)CO_(3)`
`HCO_(3)^(-)` and `Ag_(2)CO_(3)`
`HCO_(3)^(-)` and `Ag_(2)O`

Answer :B
Discussion
26.

'X' +AgNO_(3) rarr 'Y' (yellowish white ppt) 'Y' is soluble is nitricacid and ammonia. The ppt. becomes yellowish brown upon addition of excess reagent owing to the formation of 'Z'.If aqueous suspension of 'Y' is boiled then it gives the same product 'Z'.Here 'Z' is:

Answer»

`Ag_(2)CO_(3)`
`Ag`
`Ag_(2)O`
all of these

Answer :C
Discussion
27.

Which ion most stable ?

Answer»

`RB^(2+)`
`Ba^(3+)`
`SE^(2-)`
`Sn^(4+)`

Answer :c
Discussion
28.

XeF_2 is isostructural with ...........

Answer»

`SbCl_2`
`BaCl_2`
`TeF_2`
`ICI_(2)^(-)`

SOLUTION :`ICI_(2)^(-)`
Discussion
29.

Write short notes on Ionic Hydrides and give suitable examples.

Answer»

Solution :IONIC (Saline) Hydrides: These are hydrides composed of an electropositive metal, generally, an alkali or alkaline-earth metal, except beryllium and magnesium, formed by transferring of electrons from metal to hydrogen atoms. They can be PREPARED by the REACTION of ELEMENTS at about `400^(@)C`. Theseare salt-like, high-melting, WHITE, crystalline solids having hydride ions `(H^-)` and metal cations `(Mn^+)`
`2Li(s)+H_2(g)to2LiH(s)`
`2Ca(s)+H_2(g)to2CaH_2(s)`
Discussion
30.

Which of the following can stabilize gold sol from coagulation by NaCl solution:-

Answer»

`FE(OH)_(3)`
Gelatin
`As_(2)S_(3)`
None of these

Answer :B
Discussion
31.

Which of the following is correct regarding stability of conformations of n-butane about C_(2)-C bond Anti (I)gauche (II)partially eclipsed (III)fülly eclipsed (IV)

Answer»

I gt II gt III gt IV
I gt II gt IV gt III
IV gt III gt II gt I
IV gt II gt I gt III

Solution :Dihedral angle is INVERSELY proportional to stability of conformer. Dihedral angles for fully eclipsed (IV), gauche (II) , partially eclipsed (III) and anti (I) are 0,60 , 120, 180 respectively
Discussion
32.

What is the volime of a piece of silver which weighs 21.5639 g. The density of silver is 10.4 g//cm^(3) ?

Answer»


SOLUTION :VOLUME `= ("MASS")/("DENSITY")=((21.5639g))/(("10.4 g cm"^(-3)))=2.07"cm"^(3)`
Discussion
33.

What are ultramines ?

Answer»

SOLUTION :Ultramarines are aluminosilicates but do not contain water of hydration. Some extra anioins, like `CI^(-), S_(2)^(2-) and SO_(4)^(-2)`, MAY also be present in the cavities. Example of ultramarines are sodalite,
` Nag(AIO_(2))_(6)(SiO_(2))_(6)CI_(2)` , ultramarine, ` Na_(8) (AIO)_(2))_(6)(SiO_(2))_(6)S_(2)` and nosean,
`Na_(8)(AIO_(2))_(6)(SiO_(2))_(6)SO_(4)`, Many ultramarines are coloured and HENCE as pigments.
Discussion
34.

The yield of product in the reaction 2A_((g)) + B_((g)) hArr 2C_((g)) + Q K J would be lower at :

Answer»

LOW TEMPERATURE and low PRESSURE
HIGH temperature and high pressure
low temperature and too high pressure
high temperature and low pressure

Solution :high temperature and low pressure
Discussion
35.

What is electrovalent (Ionic) bond ? Explain with any two example.

Answer»

Solution :Electrovalent Oonic) bond : The bond formed, as a result of the electrostatic attraction between the positive and negative ions was termed as the electrovalent bond.
Example-I : IONIC bond formation in sodium chloride (NaCl)
Na (Alkali metal) is highly electropositive metal and form Na+ ion by loss of one electron and attain stable noble gas electronic configuration
`underset([Ne]3s^(1))(Na) rarr underset([Ne])(Na^(+)) + e^(-)` .
Chlorine is the highly electronegative halogens. It convert into `Cl^(-)`negative ion by gain one electron of sodium ion. This `Cl^(-)` ion attain stable electron configuration of noble gas AR `(3s^(2)3p^(6))`.
`underset([Ne] 3s^(2) 3p^(5)) + e^(-) rarr "" underset([Ar] " or " [Ne] 3s^(2) 3p^(6))(Cl^(-))`
Thus, `Na^(+)` positive ion and `Cl^(-)` negative ion both have stable outer shell configuration of eight (octet) electrons. And between them ionic (electrovalent) bond is formed.
`Na^(+) + Cl^(-) rarr " NaCl or " [Na^(+) Cl^(-)]`
Example-2 : Ionic bond (electrovalent) formation in `CaF_(2)`.
The calcium loses TWO electrons to attain the stable noble gas configuration of argon and converted into `Ca^(2+)`calcium.
`underset([Ar]4s^(2))(Ca) rarr underset([Ar])(Ca^(2+)) + 2e^(-)`
The halogen atom fluorine can gain highly electronegative one electron to require the stable outer shell configuration and convert into fluoride ion.
`underset([He]2s^(2) 2p^(5))(F) +e^(-) rarr underset([He]2s^(2) 2p^(6)"or"[Ne])(F^(-))`
The positive ion `Ca^(2+)` and negative ion `F^(-)` ion are held TOGETHER by strong electrostatic force of attraction and formed electrovalent bond containing `CaF_(2)`.
`Ca^(2+) + 2F^(-1) rarr CaF_(2) `
Discussion
36.

which of the following is used to make visible upper tract in an X-ray photograph?

Answer»

Milkshake
bnrium enema
`BaSO_(4)` SUSPENSION
`CaSO_(4)`

ANSWER :1
Discussion
37.

Which of the following flux is used to remove acidic impurities in metallurgical processes ?

Answer»

Silica
Lime stone
SODIUM chloride
Sodium carbonate.

SOLUTION :Lime stone is used to REMOVE acidic impurities in metallurgical processes.
Discussion
38.

When BaCl_(2) is added to an aqueous salt solution , a white ppt. is obtained . The anion amoung CO_(3)^(2-) , SO_(3)^(2-) and SO_(4)^(2-) that was present in the solution can be

Answer»

`CO_(3)^(2-)` but not any of the other two
`SO_(3)^(2-)` but not any of the other two
`SO_(4)^(2-)` but not any of the other two
any of them

SOLUTION :SINCE carbonate , SULPHITE and sulphate of Ba are insoluble is `H_(2)O` , therefore , when `BaCl_(2)` is added to the solutions of these anions , white PPT. is formed .
`BaCl_(2) + CO_(3)^(2-) or SO_(3)^(2-) or SO_(4)^(2-) to `
`(BaCO_(3) or BaSO_(4) or BaSO_(4))/("Insoluble in" H_(2)O) + 2 Cl^(-)`
Thus , any one of them may be present and hence option (d) is CORRECT .
Discussion
39.

What is the chemical composition of Sorel's cement?

Answer»

SOLUTION :`MgCl_2 . 5MgO . xH_2O`
Discussion
40.

Xg of Ag was dissolved in HNO_3 and the solution was treated with excess of NaCl when 2.87g of AgCl was precipitated. The value of X is

Answer»

1.08g
2.16g
2.70g
1.62g

Answer :B
Discussion
41.

The unit cube Length for LICL (NACL structure) is 5.14 Å. Assuming anion-anion contact, calculate the ionic radius for chloride ion.

Answer»


Solution :Interionic DISTANCE of LICL=`5.14/2`=2.57 Å
`THEREFORE BC=sqrt(AB^2+AC^2)=sqrt((2.57)^2+(2.57)^2)=3.63`
RADIUS of `Cl^-` ion=`1/2` x 3.63 Å =1.81 Å
Discussion
42.

The solubility of BaSO_4 is 5 mol L^(-1) then what is the solubility product ?

Answer»

Solution :`{:(BaSO_(4(s)) hArr, Ba_((aq))^(2+) +, SO_(4)^(2-)),(,SM, SM):}`
`K_(sp)=[Ba^(2+)][SO_4^(2-)]=(S)(S)=S^2`
`=(5)^2=25 ("MOL L"^(-1))^2`
Discussion
43.

Which pairs of ions are responsible for hardness of water ?

Answer»

SOLUTION :`Ca^(2+)` and `MG^(2+)` LIKE pairs of IONS are responsible for hardness of water.
Discussion
44.

Which one of the following elements has the highest ionization energy.

Answer»

`[He] 3s^(2) 3p^(1)`
`[He] 3s^(2) 3p^(2)`
`[He] 3s^(2) 3p^(3)`
`[AR] 3d^(10) 4s^(2) 4p^(2)`

Answer :C
Discussion
45.

What is intermolecular force and van der Waals forces ? Which forces are not included in it ? Explain its types and uses ?

Answer»

SOLUTION :Inter Molecular Forces : Inter molecular forces are the forces of attraction and replusion between interacting particles.
This term does not inclde the electrostatic forces that exist between the two oppositely charged ions the forces that hold atoms of a MOLECULE together i.e., covalent bonds.
van der Waals Forces : Attractive intermolecular forces are KNOWN as van der Waals forces. In honour of Dutch SCIENTIST Johannes van der Waals (187 - 1923), who explained the deviation of real gases from the ideal behaviour through these forces.
Under forces are not considered as van der Waals forces.
(i) Attraction force between an ion and dipole
(ii) Forces present between Atoms of molecule of covalent bond.
(iii) Attractive forces between an ion and a dipole are known as ion - dipole forces.
Van der Waals forces vary considerably in magnitude.
(i) dispersion forces of London forces.
(ii) dipole - dipole forces.
(iii) dipole - induced dipole forces.
Deviation between ideal gas and real gas is EXPLAIN by the help of van der Waals forces.
Discussion
46.

What are Fumes ?Given one example.

Answer»

Solution :Fumes are one of the non-viable particulate pollutants air. They are obtain by CONDENSATION of vapour released during sublimation, distillation , BOILING and CALCINATION.
For Example, ORGANIC solvents, metals and metalic OXIDES form fumes particles.
Discussion
47.

Which is, a meso compound?

Answer»

(2R, 3R) - 2,3-Dibromobutane
(2R,3S)-2,3-Dibromopentane
(2R, 4R)- 2,4-Dibromopentane
(2R, 4S) -2,4-Dibromopentane

SOLUTION :(2R, 4S) -2,4-Dibromopentane
Discussion
48.

What are electron deficient compounds? Are BCl_3 and SiCl_4 electron deficient?

Answer»


ANSWER :Molecules in which the central atom is SHORT of eight electrons in the valence shell are called electron DEFICIENT molecules. `BCl_3` is electron deficient as B CONTAINS only 6 electrons in the valence shell. `SiCl_4` is not electron deficient because Si has 8 electrons in its valence shell.
Discussion
49.

Which mixture is separated by physical method ?

Answer»




SOLUTION :HETEROGENEOUS MIXTURE
Discussion
50.

What are competive electron transfer reaction ? Give example.

Answer»

Solution :These are the reactions in which redox reactions take place in DIFFERENT vessels and it is an indirect redox reaction. There is a competition for the RELEASE of electrons among different metals.
Example: Zn releases electrons to Cu and Cu releases electrons to silver and so on
`Zn_((s))+Cu^(2+)rarrZn_(aq)^(2+)+Cu_((s))` (Here Zn - oxidised : `Cu^(2+)` - REDUCED)
`Cu_((s))+2Ag^(+) rarr Cu_(aq)^(2+)+2AG_((s))` (Here Cu - oxidised, `Ag^(+)` - reduced )
Discussion