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.

Give the chemistry of silver mirror test or Tollen's test

Answer»


ANSWER :T
2.

Formic acid contains ________ group/s

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aldehyde
carboxylic acid
alcohol
both (a) and ( C)

ANSWER :B
3.

Formic acid contains both _______ and ________ groups.

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`-CHOandOH`
`-CHOandX-O`
`-CHOandCOOH`
`-CHOand-O-`

ANSWER :C
4.

Formic acid cannot be halogenated with chlorine in presence of red P, but acetic acid can be halogenated in the same way ,because:

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FORMIC ACID is weaker than acetic acid
Formic acid has no `alpha-H` ATOM in its molecule
Both (a) and (b)
None

Answer :B
5.

Formic acid can reduce:Tollen's reagent,Mercuric chloride,Potassium permanganate,All.

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TOLLEN's reagent
Mercuric acid
Potassium permanganate
All

ANSWER :D
6.

Formic acid can be distinguished from acetic acid by reaction with

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`NaHCO_(3)`
dil. ACIDIFIED `KMnO_(4)` solution
2,4-dinitrophenylhydrazine
Na metal

Answer :B
7.

Formic acid can be detected with how many of the followings tests ? {:(,(a),"Idoform test",(b),"Tollen's test"),(,(c),"Litmus test",(d),"fehling test"),(,(e),NaHCO_(3) "test",(f),"Benedicts test"),(,(g),"Brady's test",(h),H^(oplus)KMnO_(4)"test"),(,(i),H^(oplus)K_(2)Cr_(2)O_(7) "test",(j),"Hinsberg test"):}

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ANSWER :7
8.

Formic acid can be distinguish from acetic acid because formic acid

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RELEASE `H_(2)` with sodium
gives ester with alcohol
reduces AMMONICAL `AgNO_(3)`
turns RED LITMUS to blue

Answer :C
9.

Formic acid and formaldehyde can be distinguised by :

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Tollen's Test
Fehling Test
Sodium bicarbonate Test
NaOH

Solution :Formic acid and formaldehyde both have aldehyde FUNCTIONAL group so they can not distinguished by tollen's test, fehling test
`H-CO_(2)Hoverset(NaHCO_(3))rarrH-CO_(2).^(-)NA^(+)+H_(2)O+CO_(2)uarr`
10.

Formic acid and acetic acid may be distinguished by reaction with :

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SODIUM
DILUTE acidic permanganate
2,4-dinitrophenyl HYDRAZINE
Sodium ETHOXIDE

Answer :B
11.

Formic acid and acetic acid differ in

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Turning blue LITMUS RED
forming an ester with methanol
replacement of HYDROGENATOM by SODIUM
reduction of Fehiling's solution

Answer :D
12.

Formic acid and acetic acid may be distinguished by the reaction with :

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Sodium metal
2,4- Denitrophenyl HYDRAZINE
Sodium ethoxide
Dil . ACIDIC POTASSIUM permanganate .

ANSWER :D
13.

Formic acid and acetic acid may bedistin guished by the action with :

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2, 4- Dinitrophenyl hydrazine
Tollen 's reagent
Sodium ethoxide
Sodium.

Answer :B
14.

Formic acid and acetic acid can be distinguished by the action of:

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conc. `H_(2)SO_(4)`
TOLLEN's reagent
Fehling's SOLUTION
sodium salt on heating

Answer :A::B::C::D
15.

Formic acid and acetic acid can be distinguished by

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Tollen's reagent
Fehling's solution
`KMnO_(4)`
`NaHCO_(3)`

Solution :Formic acid CONTAINS aldehyde GROUP it can be oxidized by Tollons reagent, FEHLINGS reagent and `KMnO_(4)`. But not ACETIC acid.
16.

Formic acid act as reducing agent. Prove this statement.

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Solution : (i) Formic ACID contains both an aldehyde as well as an acid group. Hence, like other aldehydes, formic acid can easily be oxidised and THEREFORE acts as a strong reducing agent.

(ii) Formic acid reduces Tollen.s reagent ( ammonical SILVER nitrate solution ) to metallic silver .
`HCOO^(-) + UNDERSET("(Tollen.s reagent)")(2Ag^(+)) + 3OH^(-) to underset("Silver mirror")(2Ag) + CO_(3)^(2-) + 2H_2O`
(ii) Formic acidreduces Fehling.s solution . It reduces blue coloured cupric IONS to red coloured cuprous ions .
`HCOO^(-) + underset("(Fehling solution) ( Blue)")(2Cu^(2+))+5OH^(-) to underset("Red precipitate")(Cu_2O darr) + CO_(3)^(2-) + 3H_2O`
17.

Formic acid acetic acid can be distinguished with

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sodium
`HgCl_2`
2, 4 - dinitropenyl hydrazine
`CH_3CH_2overset(-+)(ONA)`

Answer :B
18.

Formic acid

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is IMMISCIBLE with water
reduces AMMONIACAL silver nitrate
is a weak acid NEARLY THREE and a half times weaker than acetic acid
is prepared by heating potassium formate

Answer :B
19.

Formic acid:

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Is immiscible with water
Reduce ammoniacal silver nitrate
Is a weak acid nearly three and a half TIMES
weaker than ACETIC acid
Is PREPARED by heating potassium HYDROXIDE

Answer :B
20.

formed by P & Q can be differentiated by :

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2,4-DNP
Lucas REAGENT (`ZnCl_(2) &` CONC. HCl)
`NaHSO_(3)`
Fehlings solution

Answer :D
21.

Formation of which of the sulphides is most spontaneous?

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HGS
`Bi_(2)S_(3)`
PBS
`Cs_(2)`

Answer :c
22.

Formation ofLondon smog takes place in

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winter during DAY time
summer during daytime
summer during morning time
winter during morning time

Solution :London SMOG is FORMED in morning during winter.
23.

Formation of which of the following compound confirms the unsaturation character of benzene :

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Cyclohexane is in 'boat' form
Gammexane
Triozonide
All the above

Solution :Formation of all the three COMPOUNDS are the RESULT of ADDITION reaction. Hence confirm the unsaturation NATURE of BENZENE.
24.

Formation of which compound given below from 1 -butanol needs an oxidising agent?

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`CH_(3)-CH_(2)-CH_(2)CH_(2)-Br`
`CH_(3)-CH_(2)-CH_(2)CH=O`
`(CH_(3)-CH_(2)-CH_(2)CH_(2))_(2)O`
`CH_(3)-CH_(2)-CH=CH_(2)`

Solution :`CH_(3)CH_(2)CH_(2)CH_(2)OH OVERSET("Oxdition")(to)CH_(3)CH_(2)CH_(2)CHO`
25.

Formation of waterfrom its elements is spontaneous, butis slow. Comment .

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Solution :Free energy decreases during the FORMATION of water from its elemnts. Hence, thermodynamically the reaction is SPONTANEOUS. Criterion of spontanity should not be correlated with time. Spontaneous reaction means that it will take place but how long it will take, thermodynamics does not tell. At ROOM temperature, without using a CATALYST, about `1%` of the reaction is complete in one YEAR. The reaction is slow. It is kinetically non-spontaneous.
26.

Formation of SO_(3) takes place according to the reaction 2SO_(2)+O_(2)hArr2SO_(3),DeltaH=-45.2 kcal Which of the following factors favours the formation of SO_(3)

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Increase in TEMPERATUE
Increase in pressure
REMOVAL of oxygen
Increase in volume

Solution :ACCORDING to Le chatelier's PRINCIPLE when we increase pressure reaction proceeds in than DIREECTION where volume is decreasing.
27.

Formation of soap involves :

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Hydrolysis
Polymerisation
Esterification
Condensation

Answer :A
28.

Formation of Salicylic acid from phenol (Kolbe's reaction) is an example of

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ELECTROPHILIC ADDITION reaction
Nucleophilic addition reaction
Electrophilic SUBSTITUTION reaction
Nucleophilic substitution reaction

Answer :C
29.

Formation of polyethylene from calcium carbide takes place as follows CaC_(2)+2 H_(2)O rarr Ca(OH)_(2)+C_(2)H_(2) C_(2)H_(2)+H_(2) rarr C_(2)H_(2) N(C_(2)H_(4)) rarr (-CH_(2)-CH_(2)-)_(n) The amount of polyethylene obtained from 64.1 kgCaC_(2)is

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7 kg
14 kg
21 kg
28 kg

Solution :MOLES of ` CaC_(2)=(64xx10(3))/(64 )~=1 xx 10^(3)`
`:.` From the balanced chemical equations, moles of `C_(2)H_(2)=` moles of `C_(2)H_(4)` =moles of `CaC_(2)=1 xx 10^(3)`
`:.` moles of polythene `=(1)/(n)xx 1 xx 10^(3)`
`:.`weightof polythene `=(1)/(n) xx 1 xx 28n` kg=28kg
30.

Formation of purple colour on the addition of sodium nitroprusside to sodium carbonate extract indicates the presence of

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`PO_(4)^(3-)`
`SO_(3)^(2-)`
`S^(2-)`
`S_(2)O_(3)^(2-)`

Solution :`underset("nitroprusside")underset("Sodium")(Na_(2))[(CN)_(5)NO]+Na_(2)S overset(Delta)to underset("(VIOLET purple)")underset("Sodium thionitroprusside")(Na_(4)[(CN)_(5)NOS])`
31.

Formation of RBC is because of

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Mucoprotein
Vitamin `B_(12)`
Vitamin C
Both 1 & 2

Answer :B
32.

Formation of polyethylene from calcium carbide takes place as follows CaC_2+2H_2O to Ca(OH)_2 +C_2H_2 C_2H_2 +H_2 to C_2H_4 n(C_2H_4) to (-CH_2-CH_2-)_n The amount of polyethylene obtained from 64.1 kg CaC_2 is

Answer»

7 kg
14 kg
21 kg
28 kg

Solution :`underset"64 G"(CaC_2)+2H_2O to Ca(OH)_2+C_2H_2`
`C_2H_2+H_2 to underset"28 g"(C_2H_4)`
64g of `CaC_2` GIVES 28 g of ethylene
`therefore` 64 kg of `CaC_2` will give 28 kg of polyethylene
33.

Formation of phenol from chlorobenzene is an example of_____aromatic substitution occurring through____mechanism.

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SOLUTION :NUCLEOPHILIC, BENZYNE
34.

Formation of phenol from chlorobenzene is an example of_____aromatic substitution and occurs through____intermediate.

Answer»

SOLUTION :
35.

Formation of ozone in the upper atmosphere from oxygen takes place by the action of

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nitTogen oxides
ultraviolet RAYS
cosmic rays
free radicals

Solution :In PRESENCE of U.V. rays `O_(2)` is CONVERTED into `O_(3)`.
36.

Formation of ozonide is:

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ADDITION reaction
Substitution reaction
Decomposition
None

Answer :A
37.

Formation of ozone hole is maximum over

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Europe
Antarctica
India
Africa

Answer :B
38.

Formation of oxonium salts shows that ethers are :

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ACIDIC in nature
Basic in Nature
Neutral in nature
None

Answer :B
39.

Formation of oxonium saltshow thatethers are

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A) Basic in NATURE
B) Acidic in nature
C) Acidic in nature
D) None

ANSWER :A
40.

Formation of nylons and polyestersare called step growth polymerisation because

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the POLYMERS are formed by ADDING a monomer step by step
the polymers are formed by condensation and monomers are joined by loss of SIMPLE molecules like water
the monomers USED for condensation are unsaturated molecules
the polymers are formed byaddition of a large number of free readicals formed by monomers .

ANSWER :B
41.

Formation of nucleus from its nucleons is accompanied by

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DECREASE in MASS
Increase in mass
No CHANGE of mass
None of them

Solution :DUE to mass DECAY
42.

Formation of volatile Ni(CO)_(4) and then its subsquent decomposition into Ni and CO makes basis of Mond's process: Ni+4CO overset(T_(1))to Ni(CO)_(4) overset(T_(2))to Ni 4CO_(3) T_(1) and T_(2) are:

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`100^(@)C, 50^(@)C`
`50^(@)C, 100^(@)C`
`50^(@)C,230^(@)C`
`230^(@),50^(@)C`

ANSWER :C
43.

Formation of methyl tertiary butyl ether by the reaction of sodium tertiary butoxide and methyl bromide involves

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Elimination reaction
Electrophilic addition reaction
NUCLEOPHILIC addition reaction
Nucleophilic substitution reaction

Solution :The formation of methyl t-butyl ether by the reaction of SODIUM tertiary butoxide and methyl bromide INVOLVES nucleophilic substitution `(S_(N^(2)))` reaction of alkyl halides in which halogen is REPLACED by alkoxy group.
44.

Formation of metallie copper from the sulphide ore in the normal thermo-metallurgical process essentially involves which one of the following reaction?

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`CuS+(3)/(2)O_(2) to CuO+SO_(2), CuS+C to Cu+CO`
`CUS+(3)/(2)O_(2) to CuO +SO_(2), 2CuO+CuS to 3Cu+SO_(2)`
`CuS+2O_(2) to CuSO_(4), CuSO_(4) to 2Cu+2SO_(4)`
`Cus+(3)/(2)O_(2) to CuO+SO_(2), CuO+CO to Cu+CO_(2)`

Solution :The REACTION involved in the extraction of copper ore
`(a) CuS+(3)/(2) O_(2) to CuO+SO_(2)` (Roasting)
(b) `2Cu++CuS to 3Cu+5SO_(2)` (Auto REDUCTION)
45.

Formation of metallic copper from the sulphide ore in the normal thermo-metallurgical process essentially involves which one of the following reaction ?

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`{:(CuS + (3)/(2)O_(2) rarr CuO + SO_(2),),(CuO + C rarr Cu + CO):}`
`{:(CuS + (3)/(2)O_(2) rarr CuO + SO_(2),),(2CuO + CuS rarr 3Cu + SO_(2)):}`
`{:(CuS + 2O_(2) rarr CuSO_(4),),(CuSO_(4) + CuS rarr CuSO_(4)):}`
`{:(CuS + (3)/(2)O_(2) rarr CuO + SO_(2),),(CuO + CO rarr Cu + CO_(2)):}`

ANSWER :B
46.

Formation of metallic copper from sulphide ore in te normal thermometallurgical process essentially involves which of the following reactions

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`CuS+3/2O_2rarrCuO+SO_2,`
`CuO+CrarrCu+CO`
`CuS+3/2O_2rarrCuO+SO_2,`
`2CuO+CuSrarr3Cu+SO_2`
`CuS+2O_2rarrCuSO_4,`
`CsSO_4+CuSrarr2Cu+2SO_2`
`CuS+3/2O_2rarrCuO+SO_2,`
`CuO+COrarrCu+CO_2`

ANSWER :B
47.

Formation of metallic copper from the sulphide ore in the normal thermo-metallur-gical process essentially involves which one of the following reaction ?

Answer»

`CuS + (3)/(2) O_(2) to CuO + SO_(2),`
`CuS +C to CU + CO`
`CuS + (3)/(2) O_(2) to CuO + SO_(2) , `
`2CuO + CuS to 3Cu + SO_(2)`
`CuS + 2O_(2)to CuSO_(4) , `
`CuSO_(4) + CuS to 2Cu + 2SO_(2)`
`CuS + (3)/(2) O_(2) to CuO + SO_(2),`
`CuO + CO to Cu + CO_(2)`

Answer :B
48.

Formation of intertitial compounds make the transition metal :

Answer»

More SOFT
More ductile
More metallic
More brittle

Answer :D
49.

Formation of hemiketal in fructose between gtC-O group and OH group of C-5 atom, which carbon atom become chiral

Answer»

C-1
C-2
C-3
C-4

Answer :B
50.

Formation of interstitial compounds makes the transition metal

Answer»

more soft
more ductile
more metallic
more HARD and brittle

Answer :d