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.

8801.

Which of the following reactions will yield 2-propanol ? 1)CH_2=CH-CH_3+H_2O overset(H^+)to (2) CH_3CHO underset(H_3O^+)overset(CH_3MgI)to (3)HCHO underset(H_3O^+)overset(C_2H_5MgI)to (4) CH_3COCH_3 underset(H_3O^+)overset(CH_3MgI)to

Answer»

1 and 2
2 and 3
3 and 1
2 and 4

Solution :`CH_2=CH-CH_3+H_2O overset(H^+)toCH_3-CH(OH)-CH_3` (MARKOWNIKOFF addition)
`CH_3CHO underset(H_3O^+)overset(CH_3MgI)to CH_3-CH(OH)-CH_3` Reactions (1) and (2) GIVE 2-propanol
Discussion
8802.

Which of the following atoms can be a chiral center in a given molecular species? (i) Carbon (ii) Nitrogen (iii) Phosphorus (iv) Silicon

Answer»

(i),(ii),(iii),(IV)
(ii),(iii),(iv)
(iii),(iv)
Only (i)

Solution :A chiral center is an atom bonded tetrahedrally to four different atoms or groups of atoms (ligands).A chiral center is usually a `C` atom but may be `N,P,SI,` etc.
EXAMPLE of `C,Si` and `P` serving as chiral centers (stereocenters) are:
`H_(2)C=CH-underset(Br)underset(|)OVERSET(H)overset(|)(C^(**))-CH_(2)CH_(3)`
`CH_(3)CH_(2)-.^**underset(CI)underset(|)overset(CH_(3))overset(|)(Si)-CH_(2)CH_(2)CH_(3)`
`CH_(3)CH_(2)-overset(CH_(3))underset(underset(..)(overset(-)overset(.).Ooverset(.).))underset(|)overset(+|**)(N)-CH_(2)CH_(2)CH_(3)`
`CH_(3)CH_(2)-overset(CH_(3))overset(+|**)underset(H)underset(|)(P)-CH_(2)CH_(2)CH_(3)`
Discussion
8803.

Warming ammonium chloride with sodium hydroxide in a test tube is an example of:

Answer»

CLOSED system
Isolated system
Open system
None of these

Answer :C
Discussion
8804.

What type of solutions are formed on dissolving different concentrations of soap in water ?

Answer»

SOLUTION :At LOWER concentration soap FORMS a normal ELECTROLYTIC solution with water. After a certain concentration called critical micelle concentration, colloidal solution is OBTAINED.
Discussion
8805.

Which of the following exhibits purple colour in solutions

Answer»

`[Fe(H_2O)_6]^(2+)`
`[TI(H_2O)_6]^(3+)`
`[Cu(H_2O)_6]^(2+)`
`[Fe(H_2O)_6]^(3+)`

ANSWER :B
Discussion
8806.

Which of the following has weakest reducing nature?

Answer»

`NH_(3)`
`PH_(3)`
`AsH_(3)`
`SbH_(3)`

ANSWER :A
Discussion
8807.

Which of the followinghas fishy smell?

Answer»

`CH_(3)NH_(2)`
`C_(2)H_(5)NH_(2)`
`(CH_(3))_(2)NH`
`CH_(3)(CH_(2))_(4)NH_(2)`

Answer :B
Discussion
8808.

Which one is chain growth polymer:

Answer»

Polypropylene
Glyptal
Nylon-6,6
Nylon-6

Answer :A
Discussion
8809.

Which of the following statement are true.

Answer»

RED lead `(Pb_(3)O_(4))` is diamagnetic and contains both `Pb^(+2)` and `Pb^(+4)` ions.
Both `PbO` and `PbO_(2)` are amphoteric in nature.
Stannate and plumbate ions result in `SnO_(2)` and `PbO_(2)` with ACIDIC solution.
Concentrated NITRIC ACID oxidises red lead into lead dioxide.

Solution :N//A
Discussion
8810.

Write the reaction of phenol with : (i) Br_(2) water (ii) Methyl chloride in the presence of anhydrous AlCl_(3) (iii) H_(2)SO_(4) at 298 K.

Answer»

SOLUTION :
Discussion
8811.

What will be the solubility of A(OH)_(3) in its aqueous solution if its solubility product is 2.7xx10^(-39)?

Answer»

`10^(-7) "moles"/m^(3)`
`2.7xx10^(-18) "moles"/m^(3)`
`2.7xx10^(-15) "moles"/m^(3)`
`10^(-10) "moles"/m^(3)`

ANSWER :c
Discussion
8812.

Which chemicals are useful to prepare Aspirin drugs ?

Answer»

SALICYLIC ACID
Phenol
Acetyl CHLORIDE
(A) and (B) both

Solution :Salicylic acid
Discussion
8813.

Which of the following are addictive and poisonous drug?

Answer»

ibuprofen
aspirin
MORPHINE
paracetamol

Solution :morphine
Discussion
8814.

Which of the following will not form yellow ppt with an alkaline solution of iodine ?

Answer»

`CH_3CH_2CH(OH)CH_3`
`CH_3OH`
`CH_3CH_2OH`
`CH_3CH(OH)CH_3`

ANSWER :B
Discussion
8815.

Which of the following B group vitamins can be stored in our body ?

Answer»

VITAMIN `B_1`
Vitamin `B_2`
Vitamin `B_6`
Vitamin `B_12`

SOLUTION :UNLIKE`B_1,B_2and B_6` vitamin `B_12` can be sotred in BODY.
Discussion
8816.

Which of the following turn lime water milky

Answer»

`SO_(2)`
`CO_(2)` only
`CO`
`Cl_(2)`

SOLUTION :`CA(OH)_(2)+ SO_(2) to underset("white ppt")(CaSO_(3))+ H_(2)O`
`(b) Ca(OH)_(2) + CO_(2) to underset("White ppt")(CaCO_(3)) +H_(2)O`
Discussion
8817.

Which of the following compounds is expected to be coloured ?

Answer»

`Ag_2SO_4`
`CuF_2`
`MgF_2`
`CUCL`

ANSWER :B
Discussion
8818.

Which one of the following substances will be a mixed salt?

Answer»

`NaHCO_(3)`
Ca(OCl)Cl
`K_(2)SO_(4)Al_(2)(SO_(4))_(3).24H_(2)O`
Mg(OH)Br

Solution :`CaOCl_(2)` has TWO ANIONS `Cl^(-)` and `OCl^(-)` along with `Ca^(2+)` ions.
Discussion
8819.

Which of the following actionoids show oxidation states upto + 7?

Answer»

Am
PU
U
Np

Answer :BD
Discussion
8820.

Which of the following pairs of compounds are geometrical isomers ?

Answer»




SOLUTION :(1),(2) and (3) are P.I.
(4) are G.I.
Discussion
8821.

Write the classification of polymers based on structure. Give examples.

Answer»

Solution :Based on structure, polymers are classified as LINEAR polymers, branched polymers and network or cross linked polymers.
(1) Linear polymers : These polymers made up of long continuous chain without any branches . The repeating units are joined together to form a long chain . e.g. polythene, PVC.

(2) Branched polymers : These polymers consists of long and straight chain with smaller chains as branches . They have low density . Polypropylene having methyl groups as branches.

(3) Network or corss linked polymers : These polymers consist linking of chain polymers by strong COVALENT bonds leads to network like structure . e.g. melamine,bakelite, VULCANIZATION of RUBBER.
Discussion
8822.

Whichof the following is not an essential constituent of carbohydrate?

Answer»

N
O
C
H

Answer :A
Discussion
8823.

What is the difference between colloidal solution and emulsion? Give one example of each.

Answer»
Discussion
8824.

Which of the following gases turns the acdified potassium dischromate paper green

Answer»

HCL
`H_(2)S`
`CO_(2)`
`SO_(2)`

Solution :`K_(2)Cr_(2)O_(7) +4H_(2)SO_(4) +2O_(2) to K_(2) SO_(4) +Cr_(2)(SO_(4))_(3)+4H_(2)O`
Discussion
8825.

Which of the following molecule has weakest (ppi-dpi) back bonding?

Answer»

`OCl_(2)`
`N(SiH_(3))_(3)`
`SiF_(3)`
`O(SiH_(3))_(2)`

ANSWER :A
Discussion
8826.

Write the chemical equation for the reactions which occur when sodium iodate [Na IO_3] is reduced with sodium hydrogen sulphite.

Answer»

SOLUTION :`NaIO_3 + 3NaHSO_3 to 3NaHSO_4 + NAI`
Discussion
8827.

What are the applications of adsorption in chemical analysis ?

Answer»

Solution :(i) Chromatography : Thin layer Chromatography (TLC) works on the PRINCIPLE of adsorption. The Chromatography is used for the separation of the coloured components.
(ii) Adsorption indicators : The precipitates of silver halides (AgX) ACT as an adsorbent. They have property to adsorb dyes such as EOSIN, fluorescein etc. thereby producing a characteristic colour at the END point.
(iii) Separation of inert gases : Due to difference in degree of adsorption of gases by charcoal, a mixture of noble gases can be separated by adsorption on coconut charcoal at different temperatures.
Discussion
8828.

What are emulsifying agent?

Answer»

Solution :(i) Emulsions of oil and water are unstable and sometimes they separate into twolayers on standing. For the stabilization of an emulsion, a third component CALLED emulsifying agent is USUALLY ADDED. (III) The emulsifying agent FORMS an interfacial film between suspended particles and the medium.
Discussion
8829.

Which of the following is not meta-directing group in electrophilic aromatic substitution reactions ?

Answer»

`- CN`
`- CHO`
`- OCH_(3)`
`- COCH_(3)`

Answer :C
Discussion
8830.

When C Cl_4 is boiled with KOH the product formed is :

Answer»

FORMIC ACID
METHYL alcohol
Formaldehyde
carbon dioxide

Answer :D
Discussion
8831.

Which of the following is not the correct resonating structure of carbon dioxide ?

Answer»

`O=C=O`
`O^(+)-=C-O^(-)`
`""^(-)O-C-= O^(+)`
`O= ""^(-)C-= O^(+)`

ANSWER :D
Discussion
8832.

Which of the following liberates methane gas on treatment with water?

Answer»

SILICON carbide
Aluminium carbide
Calcium carbide
Iron carbide

Answer :B
Discussion
8833.

Which ionic pair from the following is coloured in aqueous solution?

Answer»

`Sc^(3+), TI`
`Sc^(3+), Co^(2+)`
`Ni^(2+), Cu^(+)`
`Ni^(2+), Ti^(3+)`

ANSWER :D
Discussion
8834.

When 2-bromobutane reacts with alcoholic Koh, the reaction is called :

Answer»

HALOGENATION
HYDROGENATION
CHLORINATION
Dehydrohalogenation

Answer :D
Discussion
8835.

What is obtained when three parts of concentrated HCl and one part of concentrated HNO_3 ?

Answer»

SOLUTION :AQUA REGIA
Discussion
8836.

underset("Orange")(Cr_(2)O_(7)^(2-)) underset underset(pH=y)(larr)overset(pH=x)to underset("green")(CrO_(4)^(2-)) The changeis basedon change uin pH probabole values of x and ycan be

Answer»

`8,6`
`8,10`
`4,6`
CHANGEIS INDEPENDENT of pH

Answer :a
Discussion
8837.

The van't Hoff factor for BaCl_(2) at 0.01 M concentration is 1.98. The percentage dissociation of BACl_(2) at this concentration is

Answer»

49
69
89
98

Solution :`{:(,BaCl_(2),HARR,BA^(2+),+,2CL^(-)),("Initial","1 MOLE",,0,,0),("After disso. ",1-ALPHA,,alpha,,2alpha","):}`
"Total no. of particles "=1+2alpha
`i=1+2alpha`
`or alpha=(i-1)/(2)=(1.98-1)/(2)=(0.98)/(2)=0.4949%`.
Discussion
8838.

What is Sandmeyer reaction?

Answer»

SOLUTION :The reaction of a diazonium salt with `CuCl//HCl` or CuBr/HBr or CuCN/KCN to give the CORRESPONDING chloroarene or bromoarene or arenenitrile is called SANDMEYER reaction.
Discussion
8839.

What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO_2 ?

Answer»

SOLUTION :White phosphorus REACTS with NaOH to FORM phosphine , as per the following equation :
`underset("Phosphorous")(P_4) + 3NaOH + 3H_2O underset(CO_2 " ATMOSPHERE")overset("Heat")to underset("Phosphine")(PH_3) + underset("SODIUM hypophosphite ")(3NaH_2PO_2)`
Discussion
8840.

Which of the following statements regarding the SN^1reaction shown by alkyl halide is incorrect ?

Answer»

The added nucleophile plays no kinetic role in `SN^1`REACTION
The `SN^1`reaction involves the inversion of the stereochemistry around carbon atom of the substrate
The`SN^1`reaction on the chiral STARTING material ends up with the racemization of the PRODUCT.
The more stable the carbocation intermediate, the faster the `SN^1`reaction

SOLUTION :The `SN^2`reaction involves the inversion of the stereochemistry around carbon atom of the substrate
Discussion
8841.

What are minerals?

Answer»

SOLUTION :A naturally occuring substance OBTAINED by mining which contains the metal in free state or in the form of compounds like oxides ,SULPHITE etc…is called as mineral .BAUXITE and clay are minerals of ALUMINIUM.
Discussion
8842.

Which are the monomer to get Nylon-2 Nylon-6 ?

Answer»

Caprolectum and ANILINE
Alinine and Amino Caproic acid
GLYCINE and Amino Caproic acid
Glycine and ACETIC acid

SOLUTION :Glycine and Amino Caproic acid
Discussion
8843.

Which of the following is not a sufactant ?

Answer»

`CH_3-(CH_2)_(15) N^(+)(CH_3)_3 Br^(-)`
`CH_3(CH_2)_(14)CH_2 NH_2`
`CH_3(CH_2)_(16) CH_2OSO_2^(-) Na^(+) `
`OHC-(CH_2)_(14)-CH_2COO^(-)Na^(+)`.

Answer :B
Discussion
8844.

Which out of the following is methamide ion ?

Answer»

`C^(2-)`
`C_(2)^(2-)`
`C_(3)^(4-)`
`C^(4-)`

SOLUTION :`C^(4-)` ION.
Discussion
8845.

Which of the following statements about proteins is not true?

Answer»

Amino acid residues join together to make a protein MOLECULE
Proteins are polymers with formula `(C_6H_(10)O_5)_`n
Eggs are RICH in protein
Pulses are GOOD source of proteins

Answer :B
Discussion
8846.

The standard oxidation potentials of Zn and Ag in water at 25^@ C are. Zn(s)rarrZn^(2+) =2e,E^@=0.76V Ag(s) rarrAg^+ +e,E^@=-0.80V Which reaction actually takes place:

Answer»

`ZN(s) +2Ag^+(aq)RARRZN^(2+)+2Ag(s)`
`Zn^(2+) +2A^+(s) rarr2Ag^+(aq)+Zn(s)`
`Zn(s) +2Ag(s) rarrZn^(2+)(aq)+AG^+(aq)`
`Zn^(2+)(aq)+Ag^+(aq) rarrZn(s) +Ag(s)`

Answer :A
Discussion
8847.

Thewhite percipaitate (P)isof ,

Answer»

`Cu_(2)I_(2)`
`Cul_(2)`
`K_(2)[CuI_(4)]
None

Answer :C
Discussion
8848.

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

Answer»

the MAGNITUDE of `DeltaG_(f)^(@)` of the sulphide is greater than those for `CS_(2)` and `H_(2)S`
the `DeltaG_(f)^(@)` is NEGATIVE for roasting of sulphide ORE to OXIDE
roasting of the sulphide to the oxide is thermodynamically feasible
carbon and hydrogen are suitable reducing agents for metal sulphides

Answer :D
Discussion
8849.

Which of the following is a 1^(@) amine and acts as a powerful stimulant ?

Answer»

Andrenaline
Caffeine
Nicotine
Amphetamine.

Solution :Amphetamine is a `1^(@)` AMINE and ACTS as a powerful STIMULANT.
Discussion
8850.

Which of the following compounds is a hydrocarbon?

Answer»

Urea
Ammonium Cyanate
Benzene
Phenol

Answer :C
Discussion