Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

21401.

What is expected value of van't Hoff factor for K_3[Fe(CN)_6]in dilute solution ?

Answer»

Solution :i = 4 as ONE particle dissociates to 4 particles
`K_3[FE(CN)_6] to 3K^(+)+ [Fe(CN)_6]`
Discussion
21402.

When KMnO_(4)acts as an oxidising agent and ultimately forms MnO_(4)^(2-),MnO_(2)O_(3)andMn^(2+), then the number of electrons transferred in each case is

Answer»

4,3,1,5
1,5,3,7
1,3,4,5
3,5,7,1

Answer :C
Discussion
21403.

Which of the following combination of axial & equitorial bonds show Cis or Trans orientation in Dimethyl cyclohexane. (i) 1e, 2e(ii) 1e, 3e(iii) 1e, 4e(iv) 1e, 2a(v) 1e, 3a(vi) 1e, 4a(vii) 1a, 3a

Answer»


ANSWER :(i) trans(ii) cis(III) trans(iv) cis(V) trans(vi) cis(VII) cis
Discussion
21404.

Which of the following is not sp^(2) hybridised ?

Answer»

GRAPHITE
graphene
Fullerene
dry ice

Solution :dry ice - solid `C_(2)` in which carbon is in SP hybridised state.
Discussion
21405.

Which of the following is a peptide hormone ?

Answer»

GLUCAGON
EPINEPHRINE
Adrenaline
Glucocorticoids

SOLUTION :Glucagon
Discussion
21406.

Which of the following is soluble in NaOH?

Answer»

ANILINE
`CH_(3)-CH_(2)-NO_(2)`

Solution :`2^(@),1^(@)` NITROCOMPOUNDS
Discussion
21407.

Write the structure of the major organic product in each of the following reactions: (i) CH_(3)CH_(2)CH_(2)Cl+NaI overset("acetone, heat")to (ii) (CH_(3))_(3)CBr+KOH overset("ethanol, heat")to (iii) CH_(3)CH(Br)CH_(2)CH_(3)+NaOH overset(water)to (iv) CH_(3)CH_(2)Br+KCN overset("aq. ethanol")to (v) C_(6)H_(5)ON a+C_(2)H_(5)Cl to (vi) CH_(3)CH_(2)CH_(2)OH+SOCl_(2)to (vii) CH_(3)CH_(2)CH=CH_(2)+HB r overset("peroxide")to (viii) CH_(3)CH=C(CH_(3))_(2)+HB rto

Answer»

Solution :(i) `underset("1-Chloropropane")(CH_(3)CH_(2)CH_(2)Cl)+NaI underset(("Finkelstein reaction"))overset("acetone, heat")to underset("1-Iodopropane")(CH_(3)CH_(2)CH_(2)I)+NaCl`
(ii) `underset("2-Bromo-2-methylpropane")((CH_(3))_(3)CB r)+KOH underset(("Dehydrohalogenation"))overset("ethanol, heat")to underset("2-Methylpropene")(CH_(3)-overset(CH_(3))overset(|)(C)=CH_(2))+HB r +H_(2)O`
(iii) `underset("2-Bromobutane")(CH_(3)-underset(Br)underset(|)(C)H-CH_(2)CH_(3))+NaOHunderset(("Hydrolysis"))overset("water")to underset("Butan-2-ol")(CH_(3)-underset(OH)underset(|)(C)H-CH_(2)CH_(3))+NaBr`
(IV) `underset("Bromoethane")(CH_(3)CH_(2)-Br)+KCN underset(("Nucleophilic substitution"))overset("aq. ethanol")to underset("Propanenitrile")(CH_(3)CH_(2)-CN+KB r)`
(v) `underset("Sod. phenoxide")(C_(6)H_(5)O^(-)Na^(+))+underset("Ethyl chloride")(C_(2)H_(5)-Cl) underset("synthesis")overset("Williamson")to underset("Phenetole")(C_(6)H_(5)-O-C_(2)H_(5))+NaCl`
(vi) `underset("Propan-1-ol")(CH_(3)CH_(2)CH_(2)OH)+SOCl_(2) underset("substitution")overset("Nucleophilic")to underset("1-Chloropropane")(CH_(3)CH_(2)CH_(2)Cl)+HCl uarr+SO_(2)uarr`
(vii) `underset("But-1-ene")(CH_(3)CH_(2)CH=CH_(2))+HB r underset(("Anti-MARK. addn."))overset("peroxide")to underset("1-Bromobutane")(CH_(3)CH_(2)CH_(2)CH_(2)Br)`
(VIII) `underset("2-Methylbut-2-ene")(CH_(3)-CH=overset(CH_(3))overset(|)(C)-CH_(3))+HBr overset("Mark. addn.")to underset("2-Bromo-2-methylbutane")(CH_(3)-CH_(2)-underset(Br)underset(|)overset(CH_(3))overset(|)(C)-CH_(3))`
Discussion
21408.

When 4.2 g of NaHCO_(3) is added to a solution of acetic acid (CH_(3)COOH) weighing 10.0 g, it is observed that 2.2 g of CO_(2) is released into the atmosphere. The residue left behind is found to weigh 12.0 g. Show that these observation are in agreement with the law of conservation of mass.

Answer»

Solution :`underset(4.2g)(NaHCO_(3))+underset(10.0g)(CH_(3)COOH)rarrunderset("RESIDUE = 12.0 g")(ubrace(CH_(3)COONa+H_(2)))+underset(2.2g)(CO_(2))uarr`
`"Total mass of reactants = 4.2 + 10.2 g = 14.2 g"`
`"Total mass of PRODUCTS"= 12.0 +2.2g=14.2g`
Discussion
21409.

Which of the following statement is correct for the thiosulphate test ?

Answer»

Thiosulphate IONS reduce `Fe^(3+)` to `Fe^(2+)` in aqueous solution
It can be prepared by OXIDATION of polysuphides
The reaction of thiosulphate with iodine is the basis of iosometric tiration in analytical chemistry
Chlorine oxidizes thiosulphate and this has LED to the USE of thiosulphate to remove excess chlorine in the bleaching industries

Solution :`(A)2S_2O_3^(2-)+2Fe^(3+)toS_4O_6^(2-)+2Fe^(2+)`
`(B)2Na_2S_3+3O_2(g)overset(Delta)to2Na_2S_2O_3+2S`
(C )`1//2I_2(aq)+e^(-)toI^(-)(aq),E^(o+)=+0.54 V`
`S_2O_3^(2-)(aq)+I_2(aq)toS_4O_6^(2-)(aq)+2I^(-)(aq)`
(D)`Na_2S_2O_3 + 4Cl_2 + 5H_2O to 2NaHSO_4 + 8HCl`
Discussion
21410.

Using the standart electrode potential find out thepairbetween which redoxreaction is not feasible E^(-) values Fe^(3+)//Fe^(2+)=+0.77 I_(2) / I =+0.54 V Cu^(2+)//Cu=+0.34 Ag^(+)//Ag=+80 v

Answer»

`Fe^(3+)` and `I^(-)`
`AG^(+)` and CU
`Fe^(3+)` and Cu
`Ag^(+)` and `Fe^(3+)`

SOLUTION :`Ag^(+)` and`Fe^(3+)` reaction is notfeasiblebecause theyhave almost same STANDARD electrodepotential
Discussion
21411.

Which alloy does not contain Ni meatal?

Answer»

GERMAN silver
Bronze
Stainless steel
Nichrome

Answer :B
Discussion
21412.

Which of the following is present in chlorophyll ?

Answer»

Mg
Be
Ca
None of these

Answer :A
Discussion
21413.

Write the product of following reactions :

Answer»


SOLUTION :
Discussion
21414.

Which one of the following reactions is/are correct?

Answer»

`CH_(3)COOK+CF_(3)COOHtoCH_(3)COOH+CF_(3)COOK`


`CH_(3)CH_(2)OH+NaHCO_(3)to CH_(3)CH_(3)Ona+H_(2)O+CO_(2)(uarr)`

SOLUTION :abc
Discussion
21415.

What is polypeptide ?

Answer»


Answer :AMINO acids can be joined to form a POLYPEPTIDE. The carboxyl group of one amino ACID is bonded with the amino group of another amino acid to have a PEPTIDE bond.
Discussion
21416.

Which of the following oxides of chromium is amphoteric in nature ?

Answer»

CRO
`Cr_2O_3`
`CrO_3`
`CrO_5`

ANSWER :B
Discussion
21417.

Which of the following carboxylic acids is highly insoluble in water

Answer»

Propanoic acid
BUTANOIC acid
Pentanoic acid
Decanoic acid

SOLUTION :Higher carboxylic acids are paractically insoluble in water DUE to the increased hydrophobic INTERACTION of hydrocarbon PART. Thus, decanoic acid is highly insoluble in water.
Discussion
21418.

Which have coded genetic information for the cell ?

Answer»

Lipid
Carbohydrates
NUCLEIC ACID
Protein 

SOLUTION :Nucleic acid
Discussion
21419.

The reagent used to distinguish formaldehyde and acetaldehyde is ..........

Answer»

TOLLEN's reagent
Fehling's SOLUTION
Schiff's reagent
CAUSTIC SODA solution

Solution :Caustic soda solution
Discussion
21420.

The time for half-life period of a certain reaction A to products, is 1 hour. When the initial concentration of the reactant, A is 2.0 mol L^(-1), how much time does it take for its concentration to come from 0.50 to 0.25 mol L^(-1) if it is a zero-order reaction?

Answer»

4 h
0.5 h
0.25 h
1 h

Solution :For zero-order REACTION, `t_(1//2)PROPA`
Discussion
21421.

Tin sulphide is :

Answer»

YELLOW solid
Soluble in yellow AMMONIUM sulphide
Precipitated by `H_2S` in ACIDIC medium
All of the above

Answer :D
Discussion
21422.

Which of the following is present in tea as well as in bark of a tree:

Answer»

TANNIC ACID
OXALIC acid
Cellulose
Caffeine

Answer :B
Discussion
21423.

Why are alkanes relativelyunreactive ?

Answer»

SOLUTION :Alkanesareinertsubstanceat roomtemperature as theyare not affectedby acidsalkaliesandoxidisingagents THISIS dueto thefactthat the C-C and C-Hbondsin alkanesare NON -polar ,I.e,they haveno reactionsiteswherethe polarregents canattack.
Discussion
21424.

Which of the following species is /are capable of forming a coordinate bond with BF_(3) ?

Answer»

`PH_(3)`
`NH_(4)^(+)`
`OH^(-)`
`MG^(2+)`

ANSWER :A::C
Discussion
21425.

Which is the incorrect statement?

Answer»

Frenkel defect is favoured in those ionic COMPOUNDS in which sizes of cation and anions are almost equal
`FeO_(0.98)` has none stiochemetric METAL DEFICIENCY defect
Density decrease in case of crystals with Schottky’s defect
`NaCI_(S)` is INSULATOR, silicon is semicondu­ctor, silver is conductor, quartz is piezo electric crystal.

Answer :A
Discussion
21426.

Which of the following orbitals is meaningless?

Answer»

6f
2d
7s
3d

Answer :B
Discussion
21427.

The tungsten used in filaments for light bulbs can be prepared from tungsten (VI) oxide by reduction with hydrogen at 1200^@CWO_3(s) + 3H_2(g)W(s) + 3H_2O (g) , Delta H = 114.9 kJDelta H_ffor H_2O(g) = -214.8 kJ "mol"^(-1) . Calculate Delta H_f for WO_3(s).

Answer»

SOLUTION :`-840.3kJ`
Discussion
21428.

Which of the following statements is incorrect. Formaldehyde, is used to

Answer»

PRESERVE BIOLOGICAL specimens.
prepare bakelite.
prepare POLYMERIC products
prepare fetilisers.

Answer :D
Discussion
21429.

Write the formula and IUPAC name of aspirin. Why should it not be taken on empty stomach ?

Answer»

Solution :
It GENERATES salicylic ACID on hydrolysis. Therefore, it should not be taken on EMPTY stomach. The acid might DAMAGE CELL walls.
Discussion
21430.

Which of the following reactions can be used to prepare lactones (cyclic esters) ?

Answer»




ANSWER :A::B::D
Discussion
21431.

Which reagent is used to distinguish formic acid and acetic acid?

Answer»

Solution :The reagent USED to distinguish FORMIC acid and ACETIC acid is ammoniacal SILVER NITRATE.
Discussion
21432.

Which of the following oxides is not expected to react with sodium hydroxide ?

Answer»

CAO
`SiO_(2)`
BeO
`B_(2)O_(3)`

ANSWER :A
Discussion
21433.

Which of the following represents a soap?

Answer»

`C_(17)H_(35)COOK `
`C_(17)H_(35)COOH`
`C_(15)H_(31)COOH`
`(C_(17)H_(35)COO)_2 Ca `

Solution :`C_(17)H_(35)COOk `
Discussion
21434.

Which catalyst is used during preparation of Teflon ?

Answer»

Ziegler-Natta
PERSULPHATE
BASE
ALKYL MERCAPTAN

SOLUTION :Persulphate
Discussion
21435.

The standard molar heat of formation of ethane, CO_2 "and" H_2 O_((l)) "are respectively" -21.1, -94.1, "and" -68.3 kcal. The standard molar heat of combustion of ethane will be _______ .

Answer»

`-372`KCAL
162 kcal
`-240`kcal
183.5 kcal

Answer :A
Discussion
21436.

Which one of the following reactions of Xenon compounds is not feasible?

Answer»

`XeO_3 + 6HF to XeF_6 + 3H_2O`
`3XeF_4 + 6H_2O to 2Xe + XeO_3 + 12HF + 1.5O_2`
`2XeF_2 + 2H_2O to 2Xe + 4HF + O_2`
`XeF_6 + RBF to RB(XeF_7)`

ANSWER :A
Discussion
21437.

Which of the following deos NOT show any reducing test of aldehyde?

Answer»

Sucrose
Fructose
maltose
None of these

Answer :A
Discussion
21438.

What is the correct IUPAC name of the given compound? CH_(3)-underset("" COOH)underset(|)overset(CH_(3))overset(|)C-CH_(2)-CH_(3)

Answer»

2, 2-Dimethylbutanoic ACID
2-Carboxyl-2-methylbutane
2-Ethyl-2-methylpropanoic acid
3-Methylbutane CARBOXYLIC acid

SOLUTION :2, 2-Dimethylbutanoic acid
Discussion
21439.

Which of the following does not represent a disaccharide ?

Answer»

Maltose
Sucrose
Lactose
Lactose

Answer :D
Discussion
21440.

Two metals exhibiting hcp arrangement are_____and_____

Answer»

SOLUTION :ZINC and CADMIUM
Discussion
21441.

Which of the following statement is not true or ionic compounds

Answer»

high melting POINT
LEAST lattice energy
least solubilityin ORGANIC compounds
soluble in water

Solution :`BaCl_(2)` contain higher ionic character.
Discussion
21442.

Which of the following is ot an allyl halide?

Answer»

4-Bromopent-2-ene
3-Bromobut-2-methylbut-1-ene
1-Bromo-2-ene
4-Bromobut-1-ene

Solution : EXCEPT (d), all other are ALLYL HALIDES i.e. they CONTAIN.
Discussion
21443.

Which type of variation is inherited ?

Answer»

LYOPHILIC COLLOIDS
LYOPHOBIC colloids
PROTECTIVE colloids
None of these.

Answer :B
Discussion
21444.

Using bond energy data, calculate heat of formation of isoprene. 5 C(s) + 4 H_(2) (g) to H_(2) C = C underset(CH_(3))underset(|)(-) C = underset(H)underset(|)(C) H_(2) (g) Given ,C - H = 98.8 k cal , H - H = 104 kcal , C - C = 83 k cal , C = C = 147 K cal &C (s) to C (g) = 171 k cal .

Answer»

SOLUTION :`+20.6` K CAL
Discussion
21445.

The stable oxidation states of Mn are:

Answer»

`+2,+3`
`+3,+7`
`+2,+7`
`+3,+5`

ANSWER :C
Discussion
21446.

Write relationship between the rate constant and its activation energy.

Answer»

SOLUTION :`K=Ae^(-E_a//RT)`
Discussion
21447.

When conc.H_2SO_4 reacts with KMnO_4 an explosive compunds is obtained which is

Answer»

`MnO_2`
`Mn_2O_7`
`MnO_4^(-2)`
None

Solution :`KMnO_4 + H_2SO_4 RARR KMnO_4 rarr H_2O + Mn_2O_7`
Discussion
21448.

Yb^(2+) is

Answer»

`reducing agent
oxidising agent
REDOX agent
ONE of the above

Answer :A
Discussion
21449.

Which one of the following will NOT produce carbon dioxide on reacting with an aqueous solution of hydrochloric acid ?

Answer»

Limestone
Quick LIME
Chalk
Marble

Solution :In the given options, marble , limestone, and baking soda are all either METAL CARBONATES or bicarbonates All these when react with a dilute acid then theyproduce carbon DIOXIDE. Whereas lime which is calcium oxide when react with a dilute acid then they do not produce carbon dioxide.
For example, `CaO+"dil. "2HCl to CaCl_(2)+ H_(2)O`
THUS, lime when reacts with an acid then it produces salt and water but it does not produce carbon dioxide.
Discussion
21450.

The unit of specific conductance is "………………".

Answer»

SOLUTION :`OHM^(-1)CM(-1).
Discussion