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.

Air contains N_(2) and O_(2) in the ratio of 4:1 by volume. The average conditions of temperature and pressure ?

Answer»

`12.0`
`14.4`
`15.6`
`28.8`

Solution :As under similar conditions of TEMPERATURE and pressure, equal volumes contain equal number of MOLES , therefore, molar ratio of `N_(2)=4//5=0.8` and mol fraction of `O_(2)=0.2`
`:.` AVERAGE VAPOUR density of air `=(28.8)/(2)=14.4`
Discussion
2.

Air contains nitrogen and oxygen in the volume ratio of 4:1. The average molecular weight of air is

Answer»

30
28.8
28
14.4

Answer :B
Discussion
3.

Air contains 79% N_(2), 20% O_(2) and 1% CO_(2) by volume. If the total pressure of air is 1 bar, find the partial pressure of N_(2), O_(2), CO_(2).

Answer»


Answer :PARTIAL PRESSURE of `N_(2), O_(2), CO_(2)` is 0.79 BAR, 0.20 bar and 0.01 bar respectively.
Discussion
4.

Air contains 21% oxygen by weight. What weight of air is required t burn 200 g of coal which contains only 80% combustible material

Answer»

`2031.79`
`1023.5g`
`426.6g`
`160g`

Solution :`underset("12g")(C)+underset("32g")(O_(2))rarrunderset("44g")(CO_(2))`
wt. if combustible meterial `(80)/(100)xx200=160g`
`12g C_________32g` OXYGEN
`160g C________426.6g` oxygen
To get 21g oxygen - take 100g air
To get 426.6g oxygen - take 2031.7g air
Discussion
5.

Air contains 21% of oxygen by volume. The number of moles of O_(2) present in 5L of air at STP conditions

Answer»

`2.23xx10^(-1)`
`4.68xx10^(-4)`
`4.68xx10^(-2)`
`0.0234`

ANSWER :C
Discussion
6.

Air contains 20% by volume of oxygen. The volume of air required for the compoete combustion of 1L of methane under the same conditions is

Answer»

2L
4L
10L
0.4L

Answer :C
Discussion
7.

Air contain 99%N_(2) and O_(2) gases. Then why don't they combine to form NO under the standard conditions? Given that the standard free energy of formation ofNO(g) is 86.7 kJ mol^(-1) .

Answer»

Solution :STANDARD free energy of FORMATION `( Delta_(f)G^(@))` for the REACTION `(1)/(2)N_(2)(g)+(1)/(2)O_(2)(g) rarr NO(g0` is POSITIVE ( equal to `+86.7 kJ mol^(-1))`. Hence, the reaction isnon-spontaneous under the standard CONDITIONS.
Discussion
8.

AI(OH)_(2)darr ("white")+ OH^(-) rarr [AI(OH)_(4)]^(-) (soluble complex) White precipitate of AI(OH)_(3) reappears when:

Answer»

a solution of AMMONIUM chloride is added
a solution of ammonia is added
concentrated `HNO_(3)` is added in excess
all of the above

Solution :`NH_(4)^(+)AI(OH)_(4)^(-) rarr NH_(4)OH + AI(OH)_(3)darr`

(Alizarin red S) `rarr` Red ppt. or LAKE in ammonical solution.
Discussion
9.

AI(OH)_(2)darr ("white")+ OH^(-) rarr [AI(OH)_(4)]^(-) (soluble complex) Identify the correctstatement with respect to the gelantinous white precipitate of aluminium hydroxide.

Answer»

Fresh precipitate dissolves by the addition of strong acid and base
Precipitate develops red lake with alizarin reagent
White precipitate is slightly soluble in excess of ammonia solution
All of the above

Solution :`NH_(4)^(+)AI(OH)_(4)^(-) rarr NH_(4)OH + AI(OH)_(3)darr`

(Alizarin red S) `rarr` Red PPT. or lake in AMMONICAL solution.
Discussion
10.

AI(OH)_(2)darr ("white")+ OH^(-) rarr [AI(OH)_(4)]^(-) (soluble complex) Fe(OH)_(3) precipitate and AI(OH)_(3) precipitate can be separated by:

Answer»

increasing the `OH^(-)` concentration by SODIUM hydroxide
increasing the `H^(+)` concentration by hydrochloric acid
(a) and (b) both
None of the above

SOLUTION :`NH_(4)^(+)AI(OH)_(4)^(-) rarr NH_(4)OH + AI(OH)_(3)darr`

(Alizarin red S) `rarr` Red ppt. or lake in ammonical solution.
Discussion
11.

AlCl_(3) exist as dimer because

Answer»

AL has greater I.P
Al has larger radius
High charge NUCLEUS
Incomplete p-orbital

Solution : `AICI_3` EXIST as dimer because of incomplete p - orbital
Discussion
12.

AICI_(3) overset(+NaOH)rarr X darr overset("excess" NaOH)rarr Y(Clear solution).

Answer»


ANSWER :ANION
Discussion
13.

AICI_3 exists as a dimer through halgen bridged bonds. (R): AICI_3 gets stability by accepting electrons from the bridged halogen.

Answer»

Both A and R are true, R explains A
Both A and R are true, R does not EXPLAIN A
A is true, but R is FALSE
A is false, but R is true

Answer :A
Discussion
14.

AICI_3 fumes in moist air due to its hydrolysis b) Al metal is stable in dry air because of protective oxide layer. c) p pi -p pi back bonding does not occur in halides of aluminium because of larger size. d) Anhydrous AICI_3 cannot be prepared by heating AlCl_3 . 6H_2 O. Correct statements are

Answer»

a , B only
b,c only
a,c,d only
All of these

Answer :D
Discussion
15.

aH_(2)S+bHNO_(3)rarrcS +dNO+ eH_(2)O. The value of([(cxxd)-e])/((a-b))=______

Answer»


SOLUTION :`3H_2S+2HNO_3rarr3S+2NO+4H_2O`
`((3xx2)-4)/((3-2))=2`
Discussion
16.

DeltaH^(0) for a reaction F_(2) + 2HCl rarr 2HF + Cl_(2) is given as -352.8 kJ. Delta H_(f)^(0) for HF is -268.3 KJ mol^(-1), then Delta H_(f)^(0) of HCl would be

Answer»

SOLUTION :`Delta H = H _(P) - H _(R) = 2 H _(HF) - 2H _(HCl)`
`=- 352.8 kJ = 2 (0268.3) - 2 (H _(HCl))`
`2 (H _(HCl))=-536.6 + 352.8 =-183.8kJ.`
(or) `H _(HCl) =-91.9 kJ mol ^(-1).`
Discussion
17.

Agl crystallises in cubic close packed ZnS structure. What fraction of tetrahedral sites is occupied byAg^(+)ions?

Answer»

Solution :In the face- centred unit CELL of AgI,there are `4 Ag^(+)`ions and ` 4I ^(-)` ions in the PACKING , therefore, there are eight tetrahderal voids. Of these , half are occupied by SLIVER cations.
Discussion
18.

AgI crystallises in cubic close packed ZnS structure. What fraction of tetrahedral sites is occupied of Ag^+ ions ?

Answer»

Solution :In the face-centred unit cell of AGI, there are `4 Ag^+` ions and `4 I^-` ions. As there are `4 I^-` ions in the PACKING. Therefore, there are eight tetrahedral VOIDS. Of these , half are occupied by silver cations.
Discussion
19.

AgI crystallises in cubic close packed ZnS structure.Guess how it mighthave happened ?

Answer»

SOLUTION :NACL MUST have beensubjected to HIGH PRESSURE.
Discussion
20.

AgF_(2) is unstable but sometimes it behaves like strong oxidising agent ?

Answer»

Solution :`AgF_(2)` contain `Ag^(+2)`. So it is unstable. Therefore it can EASILY accept `e^(-)` and BECOMES STABLE STATE `Ag^(+)`.
`Ag^(+2)toAg^(+)`
So `Ag_(2)F_(2)` strong oxidising agent.
Discussion
21.

AgCl is sparingly soluble salt ? If NaCl or KCI is added into it ? What happen ?

Answer»

SOLUTION :
So `Cl^-` increases. So REVERSE reaction take place and CONCENTRATION of solid AgCl increase. So solubilities of AgCl DECREASE.
Discussion
22.

AgCl is a sparingly soluble salt and ……..

Answer»

It is COMPLETELY INSOLUBLE in water
Its solubility in water is 1M
Its solubility in water is LESS than 0.01M
Its solubility in water is greater than 0.1M

Answer :C
Discussion
23.

AgBr_((s)) + 2S_(2)O_(3(aq))^(2-) hArr [Ag(S_(2)O_(3))_(2)]_((aq))^(3-) + Br_((aq))^(-) [Ksp(AgBr)= 5 xx 10^(-13), K_(f) [Ag(S_(2)O_(3))_(2)]^(3-) = 5 xx 10^(13)] What is the molar solubility of AgBr in 0.1 M Na_(2)S_(2)O_(3)?

Answer»

`0.5 M`
`0.45 M`
`0.045 M`
`0.65 M`

SOLUTION :`Ag_((aq))^(+) + 2S_(2)O_(3(aq))^(2-)hArr[AG(S_(2)O_(3))_(2)]_((aq))^(3-)`
`AgBr_((s)) hArr Ag_((aq))^(+) + Br_(aq)^(-)`
`ArBr_((s)) + UNDERSET((0.1-2x))(2S_(2)O_(3(aq))^(2-))hArr[Ag(S_(2)O_(3))_(2)]_((aq))^(3-)+Br_((aq))^(-)`
`Ksp xx K_(f) = 25`
As value of `K_(f)` is very higher so we can assume almost `Ag^(+)` inverts into complex
`25 = (x^(2))/((0.1 - 2x)^(2)), 5 = (x)/(0.1-2x), x = 0.045 M`
Discussion
24.

[Ag^+]in solution is 1 xx 10^(-6) M then what is the concentration of Br^- ? K_(sp) of AgBr= 4.0xx10^(-13) .

Answer»

SOLUTION :`4.0xx10^(-7)` M
Discussion
25.

Ag Br_(s) + 2S_2O_(3(aq) ) ^(2-) hArr Ag (S_2O_3)_(2(aq) ) ^(3-)+Br_(aq) ^(-)[Using :K_(sp)(AgBr)= 5xx 10 ^(-13)K_(f) (Ag(S_2O_3) _2^(3-) ) =5xx 10^(13) ] What is the molar solubility of AgBr in 0.1 M Na_2S_2O_3

Answer»

` 0.5 M`
` 0.45 M`
` 0.045 M`
None of these

SOLUTION :Due to HIGH `K_f,`ALMOST `Ag^(+) ` converts in to complex
` {:(AgBr +2S_2 O_3^(-2) HARR, [Ag(S_2O_3)_2]^(3-) ,+Br) ,(0.1M,0,0),((0.1-2x),x,x):}`
` 25= (x^(2))/((0.1-2x) ^(2) ), (x)/(0.1 - 2x) =5rArr x =0.045 M`
Discussion
26.

A(G)+B(g)hArrC(g)+D(g) Above equilibrium is established by taking A& B in a closed container. Initial concentration of A is twice of the initial concentration of B. At equilibrium concentraons of B and C are equal. Then find the equilibrium constant for the reaction, C(g)+D(g)hArrA(g)+B(g).

Answer»


SOLUTION :N//A
Discussion
27.

After the execution of the alpha-ray scattering experiment what were the observatoins made by Rutherford? What did he conclude from his observation?

Answer»

SOLUTION :
Discussion
28.

After rounding 1.235 and 1.225 to three significant figures, we will have their answers respectively as

Answer»

1.23, 1.22
1.24, 1.123
1.23, 1.23
1.24, 1.22

Answer :D
Discussion
29.

Atomic number of the element which has diffe rentiating electron enters into a d-subshell for the first time

Answer»

4s
4p
4f
5s

Answer :B
Discussion
30.

After 3d-su level is completely filled the differentiating electron enters into ….. sub level.

Answer»

4s
4p
4f
5s

Answer :A
Discussion
31.

The Lanthanide contraction relates to (AFMC)

Answer»

OXIDISING AGENT
Reducing agent
(1) and (2) both
None of these

Answer :A
Discussion
32.

Aerosol cans carry clear warning of heating of the can. Why?

Answer»

Solution :Most aersol cans contian SEVERAL ounces of a propellant carbon dioxided, propane or butane. When exposed to flame, aerosol containers experince than they were designed to resist, causing them to RUPTURE violently into large fire balls. This occurs when the gas and LIQUID inside expands when heated, increasing the pressure inside the CONTAINER.
Discussion
33.

Advantage of soap over detergent : Soap are biodegradable whereas detergents are non-biodegradable. Difference in chemical behaviour of compound of hydrogen with elements of atomic number 17 and 20.

Answer»

Solution :a. ATOMIC number 17 = CHLORINE, and atomic number 20 = calcium.
b. `H_(2)+CI_(2)to2HCI`
`CI_(2)` is OXIDIZING AGENT, `H_(2)` is reducing agent.
`Ca+H_(2)toCaH_(2)`
Discussion
34.

Adsorption of gases on solid surface is generally exothermic because

Answer»

enthalpy is positive
ENTROPY decrease
entropy increases
free energy increases.

Solution :Adsorption of GASES on SOLID surface is generally EXOTHERMIC because entropy decrease ( see EXPLANATION to Q.6 above).
Discussion
35.

Adsorption is generally an

Answer»

EXOTHERMIC process
endothermic process
may be exothermic or endothermic
neither exothermic nor endothermic.

Solution :ADSORPTION is generally ACCOMPANIED by decrease in randomness i.e., `DeltaS` for the process is -ve. As
`+DeltaS=Delta H=TDeltaS`
(-ve)= `DeltaH-(+ve)(-ve)`
or `Delta H=-ve`
`therefore` For adsorption, `DeltaH` is generally -ve i.e., process is generally exothermic.
Discussion
36.

Adsorption is multilayer in the case of

Answer»

PHYSICAL ADSORPTION
Chemisorption
Both
NONE of the above.

Solution :Physical adsorption INVOLVES multilyer adsorption
Discussion
37.

Adsorption is an exothermic process. The amount of substance adsorbed should

Answer»

INCREASE with DECREASE in temperature
increase with increase in temperature
decrease with decrease in temperature
decrease with increase in temperature

Answer :D
Discussion
38.

Adsorption is accompanied by

Answer»

DECREASE in enthalpy and increase in entropy
increase in enthalpy and increase in entropy
decrease in enthalpy and decrease in entropy
no CHANGE in enthalpy and entropy

Solution :ADSORPTION is ACCOMPANIED by decrease in enthalpy (`DeltaH= -ve`) and decrease in entropy `(DeltaS= -ve)`.
Discussion
39.

Adsorption is

Answer»

Colligative
Oxidation process
Reduction process
SURFACE PHENOMENON

Solution :ADSORPTION is a surface phenomenon.
Discussion
40.

Adsorption due to strong chemical forces is called

Answer»

Chemisorption
Physiosorption
Reversible adsorption
Both B and C

Solution :Adsorption INVOLVING STRONG chemical FORCES is known as chemisorption.
Discussion
41.

Adsorbed acetic acid on acitvated charcoal is

Answer»

Adsorber
Absorber
Adsorbent
ADSORBATE

Solution :Adsorbed ACETIC ACID on CHARCOAL is CALLED adsorbate.
Discussion
42.

Adenosine triphosphate (ATP) is the energy. Currency for celuclar processes. ATP provides the energy for both energy consuming endergonic reaction and energy releasing exerogonic reactions, which require a small input of activation energy. When the chemical bonds within ATP are broken, energy is relased and can be harnessed for celluar work. The more bonds in a molecule, the more potential energy it containsl. Because the bond in ATP is si easily broken and reformed, ATP is like a rechargeable battery that power callular processes ranging rfeom DNA replicatin to protein synthesis. Adenosine triphosphate (ATP) is comprising of the molecule adenosinek, bound to three phosphate groups. together, these chemical groups constitute energy powerhouse. Together the two bonds between the phosphates are equal high-energy bonds (phosphonhydride bonds) that, when broken release sufficient energy to power a variet of cellular reaction and processes. the bond between the beta and gamma phosphate is considered "hi-energy" because wnen the bond breaks, the products [adenosine diphosphate (ADP) and one inorgnic phosphate group (P_(1))is called hydrolysis because it concumes a water molecule (hydro, meaning "water" ,and lysis, meaning separation). ATP is hydrolyzed into ADP in the followinf reaction : ATP(aq)+H_(2)O(l)rarrADP(aq)+P_(i)(aq)+H_(3)O^(+)(aq)Delta_(r)=-30kJ//mol Like most chemical reactions, the hydrolysis of ATP to ADP is reversible. The reverse reaction combines ADP +P_(1) to regenerate ATP (adenosine diphosphate). Since ATP hydrolysis releases energy, ATP syntesis must require an input of free energy. The syntheses of ATP molecule involvesoxidationofglucosebyNDA^(+) (Nicotinamidedinucleotide)to pyruvateions (CH_(3)COCOO^(-)) by reaction. C_(6)H_(12)O_(6)(aq)+2NAD^(+)(aq)rarr2CH_(3)COCO_(2)^(-)(aq)+2NDHA(aq)+4H_(3)O^(+)(aq),Delta_(r)G^(@)=-147kJ//mol Overall reaction : C_(6)H_(12)O_(6)(aq)+2NDA^(+)(aq)+2ADP(aq)+2P_(i)(aq)+2H_(3)O^(+)(aq)rarr2CH_(3)COCO_(2)^(-)(aq)+2NADH(aq)+2ATP(aq)+2H_(2)O(l) Hydrolysis of adenosine triphosphate (ATP) is used to drive biological reaction. Which of following processes can be driven by hydrolysis of one mole of ATP molecules ?

Answer»

Biosynthesis of tripeptide (3-peptide links) with each link involving `Delta_(r)G^(@)=17 kJ//mol`
Biosynthesis of protein with 150peptide links with each link formation involving`Delta_(r)G^(@)=17 kJ//mol`
Biosynthesis of 1 mole sucrose from GLUCOSE and fructoes with `Delta_(r)G^(@)=23kJ//mol`
All of the above

ANSWER :C
Discussion
43.

Adiabatic demagnetisationis a technique used for

Answer»

ADIABATIC expansion of a gas
Product of low temperature
PRODUCTIONOF high temperature
None

Solution :A DIABATIC DEMAGNETISATION is a technique of LIQUEFACTION of gases in which temperature is reduced .
Discussion
44.

Adenosine triphosphate (ATP) is the energy. Currency for celuclar processes. ATP provides the energy for both energy consuming endergonic reaction and energy releasing exerogonic reactions, which require a small input of activation energy. When the chemical bonds within ATP are broken, energy is relased and can be harnessed for celluar work. The more bonds in a molecule, the more potential energy it containsl. Because the bond in ATP is si easily broken and reformed, ATP is like a rechargeable battery that power callular processes ranging rfeom DNA replicatin to protein synthesis. Adenosine triphosphate (ATP) is comprising of the molecule adenosinek, bound to three phosphate groups. together, these chemical groups constitute energy powerhouse. Together the two bonds between the phosphates are equal high-energy bonds (phosphonhydride bonds) that, when broken release sufficient energy to power a variet of cellular reaction and processes. the bond between the beta and gamma phosphate is considered "hi-energy" because wnen the bond breaks, the products [adenosine diphosphate (ADP) and one inorgnic phosphate group (P_(1))is called hydrolysis because it concumes a water molecule (hydro, meaning "water" ,and lysis, meaning separation). ATP is hydrolyzed into ADP in the followinf reaction : ATP(aq)+H_(2)O(l)rarrADP(aq)+P_(i)(aq)+H_(3)O^(+)(aq)Delta_(r)=-30kJ//mol Like most chemical reactions, the hydrolysis of ATP to ADP is reversible. The reverse reaction combines ADP +P_(1) to regenerate ATP (adenosine diphosphate). Since ATP hydrolysis releases energy, ATP syntesis must require an input of free energy. The syntheses of ATP molecule involvesoxidationofglucosebyNDA^(+) (Nicotinamidedinucleotide)to pyruvateions (CH_(3)COCOO^(-)) by reaction. C_(6)H_(12)O_(6)(aq)+2NAD^(+)(aq)rarr2CH_(3)COCO_(2)^(-)(aq)+2NDHA(aq)+4H_(3)O^(+)(aq),Delta_(r)G^(@)=-147kJ//mol Overall reaction : C_(6)H_(12)O_(6)(aq)+2NDA^(+)(aq)+2ADP(aq)+2P_(i)(aq)+2H_(3)O^(+)(aq)rarr2CH_(3)COCO_(2)^(-)(aq)+2NADH(aq)+2ATP(aq)+2H_(2)O(l) How many moles of ATP can by synthesised along with generation of maximum muscular and nervous work of 174 kJ by oxidation of glucose ?

Answer»

2 MOLES
4 moles
6 moles
8 moles

Answer :B
Discussion
45.

Addtion of hydrohalides to alkene is an examplefor ……………..

Answer»

SOLUTION :Electrophilicaddition
Discussion
46.

Addition reaction takes place in

Answer»

Alkane
ALKENE
ALKYL halide
Cycloalkane

Solution :Alkene have DOUBLE BOND
Discussion
47.

Addition of zinc power to CuSO_4solution precipitate copper due to

Answer»

reduction of `Cu^(2+)`
reduction of `SO_(4)^(2-)`
reduction of Zn
hydrolysis of `CuSO_4`

Solution :`Zn+overset(+2)(CuSO_(4))rarr ZnSO_(4)+overset(0)Cu`
Reduction of `Cu^(2+)`
Discussion
48.

Addition of water to which of thefollowing equilibria causes it to shift in the backward direction ?

Answer»

`CH_(3)NH_(2)(aq) + H_(2)O(l)hArrCH_(3)NH_(3)(aq) + OH^(-) (aq)`
`AGC1(s)hArrAg^(+) (aq) + C1^(-) (aq)`
`HCN (aq) + H_(2)O (l)hArrH_(3) O^(+) (aq) + CN^(-) (aq)`
`[Cr(dien)_(2)]^(3+) (aq) + 3H_(2)O (l) + 3C1^(-) (aq)hArr`
`[Cr(H_(2)O)_(3)C1_(3)] (aq) + 2` dien (aq)

Solution :NA
Discussion
49.

Addition of water to the following compound gives H_2O_2

Answer»

`CaOCl_2`
HYPEROL
`PbO_2`
`MnO_2`

ANSWER :B
Discussion
50.

Addition of water to phenyl acetylene in presence of dil. H_2SO_4 and HgSO_4 give ______

Answer»


ANSWER :ACETOPHENONE
Discussion