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.

In the following sequence of reactions :Toluene overset(KMnO_(4))toAoverset(SOCl_(2))toBunderset(H_(2)//Pd)overset(H_(2)//Pd)toC

Answer»

`C_(6)H_(5)COOH`
`C_(6)H_(5)CH_(3)`
`C_(6)H_(5)CH_(2)OH`
`C_(6)H_(5)CHO`.

Solution :
2.

In the Duma's method for the estimation of nitrogen, the gas collected in nitrometer is

Answer»

`N_(2)`
`NH_(3)`
`N_(2)+CO_(2)`
`CO_(2)`

ANSWER :A
3.

In the Duman method for the estimation of nitrogen , 0.0237 grams of an organic compound gave 2.21 mL of nitrogen at 754.32 mm of Hg pressrue at 18^(@)C. (Aquesous tension at 18^(@)C is 15.4mm of Hg). Therefore the percentage of nitrogen in the compound is

Answer»

`20.67%`
`10.6%`
`11.2%`
`13.9%`

SOLUTION :N//A
4.

In the dry cell (a) Which substance acts as anode and which as cathode ? (b) Which electrolyte is used in the cell ? (c ) What is the cell potential of the cell ? (d) Why does the cell voltage not change during operation ?

Answer»

Solution :(a) Zinc container acts as anode while carbon rod behaves as cathode.
(b) A paste of HgO and KOH acts as the electrolyte.
(C ) The cell POTENTIAL is 1.35 V.
(d) The cell VOLTAGE does not change because the OVERALL redox reaction taking place in the cell does
not involve any ions and there is no change in concentration.
`Zn(s)+HgO(s) to ZNO(s)+Hg(l)`
5.

In the following sequence of reactions: Toluene overset(KMnO_(4))toA overset(SOCl_(2))toB underset(BaSO_(4))overset(H_(2)//Pd)toC The product (C) is

Answer»

`C_(6)H_(5)CH_(2)OH`
`C_(6)H_(5)CHO`
`C_(6)H_(5)COOH`
`C_(6)H_(5)CH_(3)`

Solution :`underset("Toluene")(C_(6)H_(5)CH_(3)) OVERSET(KMnO_(4))to underset("Benzoic acid")(C_(6)H_(5)COOH) underset(-SO_(2),-HCl)overset(SOCl_(2))to`
`C_(6)H_(5)COCL underset(("Rosenmund reduction"))overset(H_(2)//Pd-BaSO_(4))to underset("Benzoyl chloride")(C_(6)H_(5)CHO)`
6.

In the Duma's method for the estimation of nitrogen , 0.84g of an organic compound gave 448ml of nitrogen at S.T.P. The percentage of nitrogen in the compound is :

Answer»

`33.3%`
`66.7%`
`50.0%`
`60%`

SOLUTION :`22400mL` of nitrogen at S.T.P. WEIGH `=28g`
`448ML` of nitrogen at S.T.P weigh
`=(28)/(22400)xx448=0.56g`
`%` Nitrogen `=(0.56)/(0.84)xx100=66.7`
7.

In the following sequence of reactions, the end product is CaC_(2) overset(H_(2)O)rarr A overset(Hg^(2+)//H_(2)SO_(4))rarr B overset([O])rarr C overset(Ca(OH)_(2))rarr D overset("heat")rarr E

Answer»

acetaldehyde
formaldehyde
acetic acid
methane

Solution :`CaC_(2) OVERSET(H_(2)O)rarr underset((A))(HC -= CH) overset(Hg^(2+),H^(+))rarr underset((B))(CH_(3)CHO) overset(O)rarr underset((C))(CH_(3)COOH) overset(Ca(OH)_(2))rarr underset((D))((CH_(2)COO)_(2)Ca) underset(-CaCO_(3))overset("Heat")rarr underset((E))(CH_(3)COCH_(3))`
8.

In the following sequence of reactions, the endproduct is CaC_2 overset(H_2O) to A overset(Hg^(2+) // H_2SO_4)to B overset"(O)"to C overset(Ca(OH)_2)to D overset"heat"to E

Answer»

acetaldehyde
formaldehyde
acetic acid
acetone

Solution :`underset"(A)"(CaC_2) OVERSET(H_2O)to underset"(B)"(HC-=CH)overset(Hg^(2+), H^(+))to CH_3CHO overset"[O]"to underset"(C)"(CH_3COOH) overset(Ca(OH)_2)to underset"(D)"((CH_3COO)_2Ca) underset(-CaCO_3)overset"Heat"to CH_3COCH_3`
9.

In the Down's process at low temperature sodium extracted is more because

Answer»

Solubility of SODIUM metal in FUSED electrolyte is less
Vapour PRESSURE of sodium is more
Solubility of sodium in fused STATE is high
Common salt is the electrolyte used

Answer :A
10.

In the following sequence of reactions, the alkene affords the compound 'B' CH_3CH=CHCH_3overset(O_3)to A underset"Zn"overset(H_2O)to BThe compound B is

Answer»

`CH_3COCH_3`
`CH_3CH_2COCH_3`
`CH_3CHO`
`CH_3CH_2CHO`

SOLUTION :
11.

In the Down's cell KCl is added in NaCl to:

Answer»

LOWER its MELTING point
Dissolve more of NaCl
Increase conductivity
Increase the dissociation

Answer :A
12.

In the DNA of E coli, the mole ratio of adenine to cytosine is 0.7. if the number of moles of adenine in the DNA is 350000, the number of moles of guanine is equal to:

Answer»

35000
500000
225000
700000

Solution :`(A)/(C)=0.7,C=(A)/(0.7)=(35000)/(0.7)=50000`
Adenine=Guanine=500000
13.

In the following sequence of reactions The compound Q formed will be

Answer»

aniline
phenol
benzaldehyde
benzene sulphonic acid

Answer :B
14.

In the dissociation of N_(2)O_(4) into NO_(2)O_(4) into NO_(2), alpha varies with ((D)/(d)) according to: [alpha degree of dissociation, D-vapour density before dissociation, d-vapour density after dissociation]

Answer»




ANSWER :B
15.

In the following sequence of reactions, the alkene affords the compound 'B' CH_(3)CH=CHCH_(3)overset(O_(3))rarrAoverset(H_(2)O)rarrB compound B is:

Answer»

`CH_(3)CH_(3)CHO`
`CH_(3)COCH_(3)`
`CH_(3)CH_(2)COCH_(3)`
`CH_(3)CHO`

SOLUTION :`CH_(3)CH=CHCH_(3) underset(H_(2))OVERSET(O_(3)//Zn)rarr2CH_(3)CHO`.
16.

In the dissociation of 2HI hArr H_2 +I_2 the degree of dissociation will be affected by the

Answer»

ADDITION of INERT gas
addition of `H_2 and I_2`
INCREASING of temperature
increasing of pressure

Answer :B::C
17.

In the dissociation of HI, it is found that 20% of the acid is dissociated when equilibrium is reached. Calculate the pressure equilibrium constant.

Answer»

SOLUTION :`1//64`
18.

In the disproportionation reaction of Cl_2 with caustic soda, the main rection products are

Answer»

`NACLO and NaClO_(3)`
`NaCl and NaClO_(3)`
`NaCl and NaClO_(2)`
`NaCl and NaClO`

Answer :B
19.

In the following sequence of reactions, the alkene affords the compound 'B'. CH_(3)CH=CHCH_(3) overset(O_(3)) to A underset(Zn)overset(H_(2)O) to B. The compound B is :

Answer»

`CH_(3)CH_(2)CHO`
`CH_(3)COCH_(3)`
`CH_(3)CH_(2)COCH_(3)`
`CH_(3)CHO`

SOLUTION :
20.

In the following sequence of reactions, the alkene affords the compound B CH_(3)CH = CHCH_(3) overset(O_(3))rarr A overset(Zn)rarr B The compound B is

Answer»

`CH_(3)CHO`
`CH_(3)CH_(2)CHO`
`CH_(3)COCH_(3)`
`CH_(3)CH_(2)COCH_(3)`

SOLUTION :
21.

In the disintegration of a radioactive element, alpha and beta-particles are evolved from the nucleus: ._(0)^(1)n to ._(1)^(1)H + ._(-1)^(0)e + Antineutrino + Energy 4 ._(1)^(1)H to ._(2)^(4)He + 2 ._(+1)^(0)e + Energy Then, emission of these particles changes the nuclear configuration and results into a daughter nuclide. Emission of an alpha-particles results into a daughter element having atomic number lowered by 2 and mass number by 4, on the order hand, emission of a beta-particle yields an element having atomic number raised by one. soddy and Fajan proposed that the daughter nuclide may occupy different positions in the periodic talbe. Select the correct statements amont the following:

Answer»

EMISSION of a `beta` PARTICLE results into ISOBAR of parent element
Emission of a `beta`-particles results into isodiaphere of parent element
Emisson of one `alpha` and two `beta` particle results into isotope of the parenet element
Emission of `gamma`-radiations MAY yield nuclear isomer

Answer :a,b,c,d
22.

In the disintegration of a radioactive element, alpha- and beta-particles are evolved from the nucleus. ._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0) + Antineutrino + Energy 4 ._(1)H^(1) rarr ._(2)He^(4) + 2 ._(+1)e^(0) + Energy Then, emission of these particles changes the nuclear configuration and results into a daughter nuclide. Emission of an alpha-particles results into a daughter element having atomic number lowered by 2 and mass number by 4, on the other hand, emission of a beta-particle yields an element having atomic number raised by 1. Select the correct statements among the following:

Answer»

Emission of a `beta`-PARTICLE RESULTS into an isobar of parent element.
Emission of `alpha`-particles results into an isodiapher of parent element.
Emission of one `alpha`-and TWO `beta`-particles results into an ISOTOPE of the parent element.
Emission of `gamma`-radiations may yield a nuclear isomer.

Answer :A::B::C::D
23.

In the following sequence of reactions M overset(K_(1))(to)Noverset(K_(2))(to)Ooverset(K_(3))(to)P:K_(1)ltK_(2)ltK_(3) then the rate determining step is

Answer»

<P>`M to N`
`N to O`
`O to P`
`M to P`

ANSWER :A
24.

In the dichromate dianion, the nature of bonds are

Answer»

four equivalent Cr-o BONDS
six equivalent Cr-O bonds and ONE O- O bond
six equivalent Cr-O bonds and one Cr- Cr bond
six equivalent Cr- O bonds and one Cr - O- Crbond

Solution :DICHROMATE dianion has 6 equivalent Cr- O bond and one Cr-O-Cr bond which can be REPRESENTED as :
25.

In the dichromate-dianion

Answer»

 4 Cr-o BONDS are equivalent
6 Cr-o bonds are equivalent
all Cr-o bonds are equivalent
all Cr-o bonds are non-equivalent

Answer :B
26.

In the following sequence of reactions. CH_(3)CH_(2)Ohoverset(P+I_(2))to A underset("ether")overset(Mg)to B overset(HCHO)to C overset(H_(2)O)to D the compound 'D' is

Answer»

Butanal
n-butyl alcohol
n-propyl alcohol
Propanal

Solution :`{:(CH_(3)Ch_(2)OH OVERSET(P+I_(2))to CH_(3)CH_(2)Iunderset("dry ether")overset(MG)to CH_(3)CH_(2)MgIoverset(H-underset(H)underset(|)C=O)to CH_(3)-CH_(2)OMgIoverset(H_(2)O)to CH_(3)CH_(2)CH_(2)OH + Mg(OH)I),(""(A)""(B)""(C)""(D)):}`
27.

In the dichromate dianion :

Answer»

4 Cr-O BONDS are EQUIVALENT
6 Cr-O bonds are equivalent
All Cr-O bonds are equivalent
All Cr-O bonds are non-equivalent

Answer :B
28.

In the dichlorination reaction of propane,mixture of products are obtained .How many compounds the mixture contain ?

Answer»

2
1
3
4

Answer :D
29.

In the following sequence of reactions CH_(3)CH_(2)OH overset(P+I_(2))(to)A overset(Mg)underset("ether")(to)Boverset(HCHO)(to)Coverset(H_(2)O)(to)D the compounds D is

Answer»

PROPANAL
butanal
n-butyl alcohol
n-propyl alcohol

Solution :
30.

In the dichromate dianion

Answer»

Cr-O BONDS are EQUIVALENT
6 Cr-O bonds are equivalent
All Cr-O bonds are equivalent
All Cr-O bonds are non-equivalent

ANSWER :B
31.

In the diazotisation of arylamine, the use of nitrous acid

Answer»

suppresses HYDROLYSIS of phenol
is a SOURCE of ELECTROPHILIC nitrosonium ion
neutralises the base liberated
all of the above

Solution :It is a source of electrophilic nitrosonium ion, i.e.,
32.

In the following sequence of reactionsCH_(3)CH_(2)CH_(2)Broverset(KOH(alc))rarr(A)overset(HBr)rarr(B)overset(KOH(aq.))rarr(C),The product ( C) is

Answer»

propan-2-ol
propan-1-ol
propyne
propene

Answer :A
33.

In the diazotisation of aniline with sodium nitrite and hydrochlorid acid, the excess of hydrochloric acid is used primarily to

Answer»

suppressthe concentration of FREE aniline
suppress the hydrolysis to phenol
ensure a stochiometric amount of nitrous acid
neutralise the base liberated

Solution :To suppress the concentration of free amine otherwise it will COUPLE with the DIAZONIUM salt to GIVE the CORRESPONDING azo dye.
34.

In the diazotisasation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily to :

Answer»

Supress the concentration of free ANILINE
Supress the HYDROLYSIS to phenol
Ensure a stoichiometric AMOUNT of nitrous ACID and HCl
Neutralise the base liberated

Answer :B
35.

In the dialysis of kidney, recycling of patient's blood is done through semipermeable tube in an ........... solution

Answer»

SOLUTION :ISOTONIC SALINE
36.

In the diagram given in the point D refers to composition where, the solution exhibits

Answer»

MAXIMUM BOILING azeotropy
Minimum boiling azeotropy
Highest VAPOUR pressure
Lowest boiling point

Solution :If vapour pressure is lower the boiling point increases.
37.

In the determination of molar mass of A^(+)B^(-) , using a colligative property, what may be thevalue of van't Hoff factor if the solute is 50% dissociated ?

Answer»

SOLUTION :`i= 1+ ALPHA = 1.5 (alpha = 0.5)`
38.

In the following sequence of reactions CH_(3)CH_(2)CH_(2)Br overset(KOH(alc))to(A)overset(HBr)To(B)overset(KOH(aq.))to(C), The product (C) is

Answer»

Propan-2-ol
Propan-1-ol
Propyne
Propene

Solution :`CH_(3)-CH_(2)-CH_(2)-Br overset(ALC." "KOH)tounderset((A))(CH_(3)-CH=CH_(2))`
39.

In the detection of phosphours in an organic compound, it is converted to sodium phosphate by fusing it with :

Answer»

SODIUM
Sodium peroxide
Sodium carbonate
Soda lime

Answer :B
40.

In the detection of hydrogen from organic compound , the compound is heated with CuO and the water produced is tested with:

Answer»

LIME water
anhydrous `CuSO_(4)`
POTASH solution
calcium CHLORIDE solution

Answer :B
41.

In the following sequence of reactions CH_3Br overset(KCN) rarrA overset(H_3O^+) rarrB overset("LiAl"H_4)rarr C the end product C is

Answer»

methane
ethyl alcohol
acetone
acetaldehyde

Solution :`CH_(3)Br overset(KCN)rarr underset('A')(CH_(3)CN) overset(H_(3)O^(+))rarr underset('B')(CH_(3)COOH) overset(LiAIH_(4))rarr underset(underset("(Ethyl alcohol)")('C'))(CH_(3)CH_(2)OH)`
42.

In the detection of halogen, nitric acid is added to the Lassaigne's extract. Its main function is to:

Answer»

oxidise the solution
destroy NACN and `Na_(2)S` which otherwise interfere in the test
make the reaction fast
provide a MEDIUM for the precipitation

Answer :B
43.

In the following sequence of reactions, CH_3-CH_2OH overset(P+I_2)to A overset("Mg/ether")to B overset(HCHO)toC overset(H_2O) D. the compound D is …………………. .

Answer»

BUTANAL
n-butyl ALCOHOL
propan-1-ol
PROPANAL

SOLUTION :propan-1-ol
44.

In the detection of carbon, lime water turns milky due to the formation of :

Answer»

`CAO`
`CA(OH)_(2)`
`CaCO_(3)`
`Ca(HCO_(3))_(2)`

Answer :C
45.

In the depression of freezing point experiment, it is found that the:

Answer»

The vapour PRESSURE of the SOLUTION is LESS than that of PURE solvent
The vapour pressure of solution is more than the pure sovent
Only the solute molecules solidify at the FREEZING point
Only the solvent molecules solidify at the freezing point.

Solution :(a,d) are both statements.
46.

In the following sequence of reactions all stereoisomers of (X) have been taken. Find the Total number of products (Z) formed.

Answer»


SOLUTION :X has 3 stereocentres with SIMILAR ends.Hence, 6 STEREOISOMERS . `Y=CH_3-undersetunderset(D)(|)CH-CHO` has one sterteocentre, hence 2 stereoisomers . `Z=CH_3-undersetunderset(D)|\CH-CH=NOH` has 2 stereocentres , hence 4 stereoisomers.
47.

In the depression of freezing point experiment, it is found that the

Answer»

Vapour pressure of the solution is LESS than that of pure solvent
Vapour pressure of the solution is more than that of pure solvent
Only SOLUTE MOLECULES solidify at the freezing POINT
Only solvent molecules solidify at the solution at room

Solution :The depression of freezing point is less than that of pure solvent and only solvent molecules solidify at the freezing point.
48.

In the depression of freezing point experiment, it is found that (a) The vapour pressure of the solution is less than that of pure solvent (b) The vapour pressure of the solution is more than that of pure solvent (c) Only solute molecules solidify at the freezing point (d) Only solvent molecules solidify at the freezing point

Answer»

a,b
b,c
a,d
a,b,c

Answer :C
49.

In the decomposition of ozone, 2 O_(3)to3O_(2), order with respect to O_(3) is………………………and that with respect to O_(2) is…………….. .

Answer»


ANSWER :2, -1
50.

In the following sequence of reactions, CH_(3)-Br overset(KCN)to A overset(H_(3)O^(+))to B underset("ether")overset(LiAlH_(4))toC the end product (C) is

Answer»

acetone
methane
acetaldehyde
ethyl alcohol

Solution :`underset("Methyl bromide")(CH_(3)-Br) underset(-KBr)OVERSET(KCN)to underset("ACETONITRILE (A)")(CH_(3)-CN) underset(("Hydrolysis"))overset(H_(3)O^(+))to underset("ACETIC acid (B)")(CH_(3)COOH) underset(("Reduction"))overset(LiAlH_(4)//ether)to underset("Ethyl alcohol (C)")(CH_(3)CH_(2)OH)`