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.

Formula for Plaster of Paris....

Answer»

`2CaSO_(4)*2H_(2)O`
`2(CaSO_(4))*H_(2)O`
`CaSO_(4)*2H_(2)O`
`2(CaSO_(4))*3H_(2)O`

ANSWER :B
Discussion
2.

Formic acid when treated with H_(2)SO_(4) gives

Answer»

`(COOH)_(2)`
`CH_(3)COOH`
`C_(2)H_(5)OH`
`CO`

Solution :`CO` is FORMED
Discussion
3.

Formic acid is prepared by distilling glycerol with:

Answer»

CRYSTALLINE OXALIC ACID at 383 K
crystalline oxalic acid at 493 K
crystalline CITRIC acid at 383 K
crystalline citric acid at 493 K

Solution :SEE Oxalic acid
Discussion
4.

Formic acid can reduce

Answer»

TOLLEN's reagent
Mercuric chloride
Potassium permanganate
all

Solution :SEE COMPREHENSIVE REVIEW
Discussion
5.

Formic acid and acid may be distinguished by the reaction with

Answer»

sodium
2, 4-Dinitrophenyl hydrazine
Sodium ethoxide
Dilute ACIDIC permanganate

Solution :`5HCOOH + 3H_(2)SO_(4) + 2KMnO_(4) rarr K_(2)SO_(4) + 2MnSO_(4) + 5CO_(2) + 8 H_(2)O`
`CH_(3)COOH + KMnO_(4) + H_(2)SO_(4) rarr`
No REACTION.
Discussion
6.

Formic acid and Acetaldehyde can be distinguish by

Answer»

`I_(2)+NAOH`
Tollen's REAGENT
Fehling solution
2,4-DNP test

Answer :A::D
Discussion
7.

Formation of ozone takes place as O_(2)(g) + O(g) rarr O_(3)(g) , DeltaH^(@)=- 107 . 2kJ . Assuming O = O bond energyas 498.8 kJ mol^(-1), the average bond energy of ozone is

Answer»

`391.6 kJmol^(-1)`
` 606 . 0 kJmol^(-1)`
` 107.2kJ MOL^(-1)`
` 302 .6 KJ mol^(-1)`

Solution :`Delta_(r)H^(@) = [ BE(O=O)+BE(O) ]-2[BE ( O OVERSET("......")(_)O)]`
`:. -107.2= 498 + 0 -2BE ( O overset("......")(_)O)`
as `O_(3)` is
or `2BE ( O overset("….....")(O overset("….....")(_)O) = 498 .0 +107.2 = 605.2`
or `BE(Ooverset("….....")(_)O) = ( 605.2)/( 2)= 302.6`
Discussion
8.

Formation of London smog takes place in

Answer»

WINTER during day TIME
winter during morig time
SUMMER during day time
Summer during MORNING time

Solution :LONDON smog is formed in morning during winter.
Discussion
9.

Formation of London smog is initiated by a mixture of __________and ___________and is formed in the _______season

Answer»


ANSWER :`SO_2` , PARTICULATES, HIGH HUMIDITY , WINTER
Discussion
10.

Formation of benzene from acetylene is

Answer»

TRIMERISATION 
TETRAMERISATION 
DIMERISATION 
CONDENSATION 

ANSWER :A
Discussion
11.

Formation of ammonia from H_(2) and N_(2) by Haber's process using Fe is an example of

Answer»

HETEROGENOUS catalysis
Homogenous catalyst
Enzyme catalysis
Non-catalystic process

Solution :The catalystic process in which the reactants and the catalyst are in DIFFERENT phases in known as heterogenous catalysis.
`N_(2(g))+3H_(2(g))overset(FE(s))to2NH_(3(g))`
The reactants are in gaseous state while the catalyst is in solid state.
Discussion
12.

Formation of alcohol from alkene.

Answer»

Solution :`H_(2)O` means `overset(+delta)(H) overset(-delta)(OH)`. ALKENE reacts with `H_(2)SO_(4)`, an addition of `H_(2)O, -OH` (ALCOHOL) is formed.
This reaction is addition of `H_(2)O` or dydrolysis of alkene or formation of alocohol from alkene. This reaction is electrophilic addition reaction. markonikov rule is APPLIED.
`underset("Ethene")(CH_(2)=CH_(2))+H_(2)O underset((H_(2)SO_(4)))overset(100^(@)C H^(+), Delta)rarr underset("Ethanol")(CH_(3)-CH_(2)OH)`
`underset("Propene")(CH_(3)CH=CH_(2))+H_(2)O underset(H_(2)SO_(4))overset(373 K H^(+))rarr underset("Propane-2-ol")(CH_(3)-underset(OH)underset(|)(CH)-CH_(3))`
`underset("2-Methyl prepene")(CH_(3)-underset(CH_(3))underset(|)(C)=CH_(2)+H_(2)O)underset(H_(2)SO_(4))overset(H^(+))rarr underset("2-Methyl prepane-2-ol")(CH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-CH_(3))`
Discussion
13.

Formation of a green edged flame on igniting the vapours evolved by heating an inorganic salt with a few mL of ethyl alcohol and conc. H_(2)SO_(4) indicates the presence of :

Answer»

tartarate
oxalate
borate
acetate

Solution :It is the CORRECT answer. ETHYL borate is formed in the REACTIONS. Its vapours BURN with a green edged flame.
Discussion
14.

Formation heat of H_(2) O is -68 k.cal/mole then, find the formation heat of OH^(-)

Answer»

SOLUTION :`-54.3` k.cal/mole
Discussion
15.

Formaldehyde reacts with grignard reagent to give____products.

Answer»

ADDITION
Substitution
Condence
Elimination

Solution :Addition
Discussion
16.

Formaldehyde polymerises to form glucose according to the reaction 6 HCHO hArr C_(6) H_(12)O_(6) ltbr gt The theoretically computed equiibrium constant for this reaction is found to be6 xx 10^(22).If 1 M solution of glucose dissociates according to the above equilibrium , what will be the concentration of formaldehyde in the solution ?

Answer»

Solution :` 6 HCHO hArr C_(6) H_(12)O_(6)`
As equilibrium constant for this reaction is very large, therfore for the reverse reaction involving dissociation of glucose, equilibrium constant is very very small . HENCE , for the reverse reaction
` C_(6) H_(12)O_(6) hArr6 HCHO"" (K= 1/(6 xx 10^(22)))^(1//6)`
dissociation of glucose is negligible . Starting with 1 M, concentration at equilibrium at equilibrium `cong 1 M`
` K= ([HCHO]^(6))/([C_(6)H_(12)O_(6) )`
` 1/(6 xx 10^(22)) = ([HCHO]^(6))/1 or [HCHO] = (1/(6xx10^(22)))^(1//6)`
`log [HCHO] = 1/6 [-log (6xx10^(22)] = 1/6 [-22* 778 ] = -3* 7963 = bar 4* 2137`
` :.[HCHO] = 1* 636 xx 10^(-4) "M"`
Discussion
17.

Formal charge of an atom can be calculated by the formula………………

Answer»

Solution :`N_(V)-[N_(L)+(N_(B))/(2)]`
Discussion
18.

Force is required to maintain the flow of layers of liquid depend upon ?

Answer»

SOLUTION :(i) AREA of contact surface (A) and (ii) VELOCITY gradient `((dy)/(DZ))`
`F prop A, F prop (dy)/(dz)` So, `F prop (A) ((dy)/(dz))`
Discussion
19.

Force is "…..........." property whereas pressure is "…......................."property in thermodynamics .

Answer»

SOLUTION :EXTENSIVE, INTENSIVE
Discussion
20.

For your agricultural field or garden, you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.

Answer»

Solution :The compost producing pit should be set up at a suitable place or in a tin to PROTECT ourselves from bad odour and flies It should be kept covered so that fits cannot make entry into it and the bad odour is minimized The RECYCLABLE material like plastics, glans newspapers, etc should be sold to the VENDER who further sells it to the dealer. The dealer further supplies it to the industry involved in recycling process
Discussion
21.

For your agriculture field or garden, you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.

Answer»

Solution :The compost PIT shall be set up either away from human in habitance or in containers to CHECK foul smell and slies. The pit has to be covered PROPERLY to protect us from bad odour and flies. Glass, plastic, paper, metal SCRAP etc. are to be send to industry for recycling.
Discussion
22.

For your agricultural field or garden you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.

Answer»

Solution :Compost seals to protect man from bad smell proper FITNESS is NEEDED. Keeping it covered keeps it in its scalp these who can be RECYCLED should be brought who can be recyeled should be brought back to the INDUSTRY for REPRODUCTION.
Discussion
23.

For XY_(2 (g)) hArr XY_((g)) + Y_((g)) , initally 1 mole each of XY_(2) & Y are present in 10 lit flask at 500 mm . If the equilibrium pressure of XY is 150 mm , K_(p) is (in mm)

Answer»

500
`SQRT(500)`
300
600

Answer :D
Discussion
24.

For writing the following structure, the no,-1 is given to which end? underset(7)overset(1)(C H_(3)) - underset(6)overset(2)(CH_(2))- underset(underset(underset(underset(CH_(3))(|))(CH_(2)))(5|))overset(2)(CH)- underset(underset(CH_(3))(4|))overset(overset(CH_(3))(4|))(C )- underset(3)overset(5)(CH_(2))- underset(2)overset(6)(CH_(2))- underset(1)overset(7)(C H_(3))

Answer»

Solution :(i) If LEFT side no-1 is given then NAME is 3-ethyl-4, 4-dimethyl (ii) If right side no, -1 is given then name is 5-ethyl-4, 4-dimethyl. In left side the ethyl substitute GET lower no-3 according to alphabetical order
`THEREFORE` So, In structure no. 1 is START at left side end
Discussion
25.

For which substances kjeldahl's method is not useful ?

Answer»

SOLUTION :For compounds in which NITROGEN is a PART of heterocyclic RING.
Discussion
26.

For which reaction Delta S can be maximum if it is occuring at constant volume ?

Answer»

`N_(2(g)) + O_(2(g)) to 2NO_((g))`
`CaCO_(3(s)) to CaO_((s)) + CO_(2(g))`
`C_((s)) + O_(2(g)) to CO_(2(g))`
`Mg_((s)) + (1)/(2) O_(2(g)) to MgO_((s))`

ANSWER :B
Discussion
27.

For which reacrion (s) is the DeltaH value close to the DeltaE value ? (p)CH_(4)(g)+2O(g)toCO(g)+2H_(2)O(l) (Q) C_(2)H_(4)(g)+3O_(2)(g)to2CO_(2)(g)+2H_(2)O(g)

Answer»

<P>P only
Q only
Both p and Q
Neither P nor Q

Answer :B
Discussion
28.

For which reaction at equilibrium will a decrease in volume at constant temperature cause a decrease in the amount of product?

Answer»

`N_(2)(g)+3H_(2)(g) RARR 2NH_(3)(g)`
`HCl(g)+H_(2)O(l)rarrH_(3)O^(+)(aq)+Cl^(-)(aq)`
`Fe_(3)O_(4)(s)+4H_(2)(g)rarr3Fe(S)+4H_(2)O(g)`
`CaCO_(3)(s)rarrCaO(s)+CO_(2)(g)`

Answer :D
Discussion
29.

For which reaction at equilibrium does a decrease in volume of the container cause a decrease in product(s), quantity at comstant temperature?

Answer»

`CaCO_(3)(s)rarrCaO(s)+CO_(2)(G)`
`2SO_(2)(g)+O_(2)rarr2SO_(3)(g)`
`HCL(g)+H_(2)O(L)rarrH_(3)O^(+)(aq)+Cl^(-)(aq)`
`SO_(2)(g)+NO_(2)(g)rarrSO_(3)(g)+NO(g)`

Answer :A
Discussion
30.

For which one of the following systems DE lt DH

Answer»

`2SO_(2(G)) + O_(2(g)) to 2SO_(3(g))`
`N_(2(g)) + O_(2(g)) to 2NO_((g))`
`2NH_(3(g)) to N_(2(g)) + 3H_(2(g))`
`H_(2(g)) + I_(2(g)) to 2HI_((g))`

ANSWER :C
Discussion
31.

For which one of the followingreactions , the entropy changes is positive ?

Answer»

`UNDERSET((g))(H_2) + underset((g))(1/2O_(2)) rarr underset((L))(H_2O)`
`underset((g))(NA^+) + underset((g))(CL^(-)) rarr underset((S))(NaCl)`
`underset((l))(NaCl) rarr underset((S))(NaCl)`
`underset((l))(H_2O) rarr underset((g))(H_2O`

Answer :B
Discussion
32.

For Which of the reaction below is (are) the heat of reaction euqal to the heat of formation ? (p)(1)/(2)N_(2)(g)+O_(2)(g)to NO_(2)(g) DeltaHgt0 (Q)SO_(2)(g)+(1)/(2)O_(2)(g)to SO_(3)(g) DeltaHlt 0

Answer»

<P>P only
Q only
Both p and Q
Neither P nor Q

Answer :a
Discussion
33.

For whichof thereactionreaction |DeltaH|gt|DeltaU|?

Answer»

`C_(2)H_(6)+(7)/( 2)O_(2)to 2CO_(2)+ 3H_(2)O`at 1barand 27
`C_(6)H_(6)(l)to C_(6)H_(6)(g)`
`N_(6)(g)+3H_(2)(g)iff2NH_(3)(g)`
`C_(2)H_(4)+ 3O_(2) to 2CO_(2)+2H_(2)O`

ANSWER :b,c,d
Discussion
34.

For which of the process, Delta S is negative?

Answer»

`H _(2 (g)) to 2 H _((g))`
`N _(2 (g)) (1ATM) to N _(2 (g)) (8atm)`
`2SO _(3 (g)) to 2SO _(2 (g)) + O _(2 (g))`
`C _(("diamond")) to C _(("graphite"))`

Answer :B
Discussion
35.

for which of the following species, the expression for the energy of electron in the n^(th)[E_(n)=(13.6Z^(2))/(n^(2))eV" atom"^(-1)] has the validity?

Answer»

TRITIUM
`Li^(2+)`
DEUTERIUM
`He^(2+)`

Answer :A::B::C
Discussion
36.

For which of the following species, the expression for the energy of electron in n^(th) orbit [E_(n) = -(13.6)/(n^(2)) xx Z^(2) e "V atom"^(-1)] has the validity ?

Answer»

Tritium
`LI^(2+)`
Deuterium
`He^(2+)`

Answer :A::B::C
Discussion
37.

For which of the following species, Bohr theory is not applicable ?

Answer»

`Be^(3+)`
`LI^(2+)`
`He^(2+)`
`H`.

Answer :C
Discussion
38.

For which of the following sparingly soluble salt, the solubility (S) and solubility product (K_(sp)) are related by the expression S=(K_(sp)??4)^(1//3)?

Answer»

`BaSO_(4)`
`Ca_(3)(PO_(4))_(2)`
`Hg_(2)Cl_(2)`
`Ag_(3)PO_(4)`

Solution :`BasO_(4)hArrBa^(2+)+SO_(4)^(2-),K_(sp)=S^(2) " or" S=(K_(sp))^(1//2)`
`Ca_(3)(PO_(4))_(2)hArr3Ca^(2+)+2PO_(4)^(3-),K_(sp)=(3S)^(3)(2S)^(2)=108S^(5) " or" S=(K_(sp)//108)^(1//5)`
`Hg_(2)Cl_(2)hArr Hg_(2)^(2+) + 2 Cl^(-), K_(sp)=S(2S)^(2)=4S^(3) " or" S=(K_(sp)//4)^(1//3)`
`Ag_(3)PO_(4)hArr3Ag^(+)+PO_(4)^(3-), K_(sp)=(3S)^(3)S=27S^(4) "or" S=(K_(sp)//27)^(1//4)`
`CUS hArr Cu^(2+)+S^(2-), K_(sp)=[S][S]=S^(2) "or" S=(K_(sp))^(1//2)`
Discussion
39.

For which of the following sets, all the compounds are ionic ?

Answer»

`NAF,BF_3 ,MG F_2`
`NaBr ,Mg Br_2 ,MgO`
`al_2 O_3 ,MgO,SO_3`
`NCl_3 , BeCl_2 ,AlCl_3`

ANSWER :B
Discussion
40.

For which of the following reactions, the degree of dissociation cannot be calculated from the vapour density data. I. 2HI_((g))hArrH_(2(g))+I_(2(g)) II. 2NH_(3(g))hArrN_(2(g))+3H_(2(g)) III. 2NO_((g))hArrN_(2(g))+O_(2(g)) IV. PCl_(5(g))hArr PCl_(3(g))+Cl_(2(g))

Answer»

I and III
III and IV
I and II
II and III

Answer :A
Discussion
41.

For which of the following reactions, K_p(RT)^2=K_c

Answer»

<P>`PCI_(5(g)) ltimplies PCI_(3(g))+CI_(2(g))`
`N_(2(g))+3H_(2(g))ltimplies2NH_(3(g))`
`2SO_(2(g))+O_(2(g))ltimplies2SO_(3(g))`
`H_(2(g))+I_(2(g))ltimplies2HI_((g))`

Solution :`K_(P)=K_(C)(RT)^(Delta ng), Delta ng=2`
Discussion
42.

For which of the following reactions, the degree of dissociation (alpha) and equilibrium constant (K_(p)) are related as K_(p) = (4 alpha^(2) p)/((1 - alpha^(2)))

Answer»

`N_2O_(4(g)) harr 2NO_(2(g))`
`H_(2(g))+I_(2(g)) harr 2HI_((g))`
`N_(2(g))+3H_(2(g)) harr 2NH_(3(g))`
`PCI_(3(g))+CI_(2(g)) harr PCI_(5(g))`

SOLUTION :`K_(P)` units = `("atm")^(1)IMPLIES DELTA n_(g)=1`
Discussion
43.

For which of the following reaction, the degree of dissociation (alpha) and equilibrium constant (K_(p)) are related as K_(p)=(4alpha^(2)P)/((1-alpha))?

Answer»

`N_(2)O_(4(G))hArr2NO_(2)(g)`
`H_(2(g))+I_(2(g))hArr2HI(g)`
`N_(2(g))+3H_(2(g))hArr2NH_(3(g))`
`PCl_(3(g))+Cl_(2(g))hArrPCl_(5(g))`

Answer :A
Discussion
44.

For which of the following reaction K_(p)=K_(c)?

Answer»

`N_(2(G))+3H_(2(g))hArr2NH_(3(g))`
`2NOCl((g))hArr2NO_((g))+Cl_(2(g))`
`H_(2(g))+I_(2(g))hArr2HI_((g))`
`CO_(2(g))+C_((s))hArr2CO_((g))`

Answer :C
Discussion
45.

For which of the following reaction Delta H ne Delta E ?

Answer»

`H_(2(g)) + I_(2(g)) hArr 2HI_((g))`
`C_((s)) + O_(2(g)) hArr CO_(2(g))`
`N_(2(g)) + 3H_(2(g)) hArr 2NH_(3(g))`
`HCI_((AQ)) + NaOH_((aq)) hArr NaCI_((aq)) + H_(2) O_((l))`

Solution :`Delta n_((g))=2-4 = -2 ""[therefore Delta H ne Delta E]`
Discussion
46.

For which of the following reaction is aluminium isopropoxide a specific reagent

Answer»

`R-NO_(2) rarr R-NOH`
`RCOOR rarr RCH_(2)OH`
`RCH=CHCHO rarr RCH=CH-CH_(2)OH`
`RCH=CH-CH_(2)CL rarr RCH=CHCH_(3)`

Solution :It is a SPECIFIC reagent for the reduction of carbonyl group. Thus aluminium ISOPROPOXIDE may be used for reducing aldehydes and ketones containingsome other reducible group such as a double bond or a NITRO group.
[Meerwin-Pondorf-Verley (MPV) reduction].
Discussion
47.

For which of the following reaction Delta H = Delta E + 2RT

Answer»

`2SO_(2(g)) + O_(2(g)) RARR 2SO_(3(g))`
`NH_(4)HS_((s)) rarr NH_(3(g))+ H_(2)S_((g))`
`N_(2(g)) + O_(2(g)) rarr 2NO_((g))`
`PCl_(5(g)) rarr PCl_(3(g)) + Cl_(2(g))`

Solution :`DELTA H = Delta E + Delta n_(g) RT rArr Delta n_(g) = 2`
Discussion
48.

For which of the following pairs of compounds are the CORRECT notation given

Answer»




SOLUTION :Gauche FORMS are stable due to intra molecular HYDROGEN BOND
Discussion
49.

For which of the following K_(p) may be equal to 0.5 atm

Answer»

`2HIhArrH_(2) + I_(2)`
`PC1_(5(g))hArrPC1_(3) + C1_(2)`
`N_(2) + 3H_(2)hArr2NH_(3)`
`2NO_(2)hArrN_(2) O_(4)`

Solution :For `K_(p) = 0.5` atm
`Delta n = 1` (since the unit is atm) and `PC1_(5)hArrPC1_(3) + C1_(2)`
`Delta n = 1`
Discussion
50.

For which of the following gas compressibility factor value increases with increase of pressure even at low temperatures

Answer»

sulphur dioxide
METHANE
HELIUM
CARBON monoxide

ANSWER :C
Discussion