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.

14451.

The specific rotation of aqueous sucrose is

Answer»

`+52.50` 
`-92.40` 
`+66.50` 
`+20^(@)`

ANSWER :C
Discussion
14452.

What would happen to a reversible reaction at equlibrium when an inert gas is added while the pressure remains unchanged

Answer»

More of the PRODUCT will be formed
LESS of the product will be formed
More of the reactants will be formed
It remains UNAFFECTED

ANSWER :D
Discussion
14453.

When glucose is treated with excess of phenylhydrazine in acetic acid , the product is

Answer»

glucosazone
phenylhydrazone of GLUCOSE
oxime of glucose
GLUCOSAMINE

ANSWER :A
Discussion
14454.

Which of the following examples is not correctly matched ?

Answer»

TWO most abundant ELEMENTS -Fe, Al.
Two METALS which occur in NATIVE state -AU, Pt.
Two metals which can occur in combined and native state both -Zn, Fe
None of these

Solution :Zn and Fe occur only in combined state.
Discussion
14455.

Zinc sulphate contains 22.65% n and 43.9% H_(2)O . If the law of constant proportions is true, then the mass of zinc required to give 40 g crystals will be:

Answer»

90.6g
9.06g
0.906g
906g

Answer :B
Discussion
14456.

Which one of the following is chloropicrin ?

Answer»

`C Cl_3 CHO`
`C Cl_3-underset(OH)underset(|)(C)(CH_3)_2`
`C Cl_3-NO_2`
`CHCl_2-CHCl_2`

ANSWER :C
Discussion
14457.

Which catalyst is used for manufacturing of CH_(3)OH from H_(2) and CO ?

Answer»

MIXTURE of `CU,ZnO and Cr_(2)O_(3)`
Only `Cu`
Only `ZnO`
Only `Cr_(2)O_(3)`

Solution :Mixture of `Cu, ZnO and Cr_(2)O_(3)`
Discussion
14458.

Which is not used in preparation of lyophilic sol?

Answer»

WHITE of an egg
Rubber
METAL SULPHIDE
Gelatin 

SOLUTION :Metal sulphide
Discussion
14459.

Which species has the maximum number of lone pair of electrons on the central atom ?

Answer»

1. `ClO_(3)^(-)`
2. `XeF_(4)`
3. `SF_(4)`
4. `[I_(3)]^(-)`

Solution :
`I_(3)^(-)`has maximum no. of unpaired electrons.
Discussion
14460.

Which one is most reactive towards S N.. reaction ?

Answer»

1 - Bromopentane
1 - Bromo- 2- methyl BUTANE
1 - Bromo- 3- methyl butane
2 - Bromo- 2- methyl butane

Solution :Smaller the size of ALKYL GROUP faster is RATE of `S_N2`reaction
Discussion
14461.

When H_(2)S gas is passed through HCI containingaqueous solution of CuCI_(3),HGCI_(2),BaCI_(2),BiCI_(3) and CoCI_(2) then whichof the following precipitate out ?

Answer»

CuS
HgS
`Bi_(2)S_(3)`
CoS

Answer :a,B,C
Discussion
14462.

What mass of Na_(2)SO_(4).7H_(2)O contains exactly 6.022 xx 10^(22) atoms of oxygen ?

Answer»


ANSWER :`2.436` G
Discussion
14463.

To 500cm^(3) of water, 3.0 xx 10^(-3) kg acetic acid is added. If 23% of acetic acid is dissociated, what will be the depression in freezing point? K_(f) and density of water are 1.86 K kg mol^(-1) and 0.997 g cm^(-3) respectively.

Answer»

Solution :`{:(,CH_(3)COOHhArrCH_(3)COO^(-)+H^(+),),("Initial","1 mole00 ",),("After disso. ","1 - 0.230.230.23","Total = 1.23 moles"):}`
`THEREFORE " van't Hoff factor, i = 1.23"`
Mass of water (SOLVENT) `=500xx0.997=498.5g`
No. of moles of ACETIC acid `=(3xx10^(-3)xx10^(3))/(60)=0.05`
`therefore"Molality of the solution "=(0.05)/(498.5)xx1000=0.1`
`DeltaT_(f)=iK_(f)m=1.23xx1.86xx0.1=0.228K`
Discussion
14464.

WhenKCl is heated with conc H_2SO_4 and solid K_2Cr_2O_7 we get

Answer»

CHROMIC CHLORIDE
Chromous chloride
Chromyl chloride `(CrO_2Cl_2)`
Chromic Sulphate

Answer :C
Discussion
14465.

Write the difference between : (b) promoters and poisons

Answer»

SOLUTION :(b) PROMOTERS ENHANCE the activity of a catalyst while poisons DECREASE the activity of CATALYSTS.
Discussion
14466.

Two isomeric compounds Aand B having the moleculars formula C_3H_7Br form the same compound C on dehydrobromination. C on ozonolysis produces acetaldehyde and formaldehyde. Identify A, B and C.

Answer»

SOLUTION :(i) `A RARR CH_(3)CH_(2)CH_(2)BR, B rArr CH_(3)CH(Br)CH_(3), C rarr CH_(3) CH = CH_(2)`
Discussion
14467.

Which one of the following compound is a gas (at 0^(@)C):

Answer»

`BF_(3)`
`BCl_(3)`
`BBr_(3)`
`Bl_(3)`

Solution :There is least van DER Waal's force of attraction in `BF_(3)` on ACCOUNT of less NUMBER of polarisable electrons among the boron HALIDES. So `BF_(3)`is gas at `0^(@)C`.
Discussion
14468.

Which product do you expect from the reaction ? CH_(3) - overset(CH_(3))overset(|)(C) = CH_(2) underset((ii)H_(2)O_(2),OH)overset((i) (BH_(3))_(2))rarr

Answer»

`CH_(3) - overset(CH_(3))overset(|)(CH) - CH_(2)OH`
`CH_(3) - underset(OH)underset(|)overset(CH_(3))overset(|)(C) - CH_(3)`
`CH_(3) - underset(OH)underset(|)(CH) - overset(CH_(3))overset(|)(CH_(2))`
`CH_(3) - underset(CH_(3))underset(|)(CH) - CHO`

Solution :`CH_(3) - overset(CH_(3))overset(|)(C) = CH_(2) underset(H_(2)O_(2),OH)overset((BH_(3))_(2))rarr CH_(3) - underset(H)underset(|)overset(CH_(3))overset(|)(C) - CH_(2)OH`
This reaction proceeds as
`CH_(3)overset(CH_(3))overset(|)(C) = CH_(2) + BH_(3) rarr underset("Trialkyl borane")([(CH_(3))_(2)CHCH_(2)]_(3)B) underset(OH^(-))overset(H_(2)O_(2))rarr underset("Alcohol")(3(CH_(3))_(2) CHCH_(2)OH`
The overall result of the reaction is anti-Markovnikov.s ADDITION of `H_(2)O` to a DOUBLE bond. This is called hydroboration reaction.
Discussion
14469.

The standard emf of galvanic cell involving 3 moles of electrons in its redos reaction is 0.59V. The equilibrium constant for the reaction of the cell is

Answer»

`10^(25)`
`10^(20)`
`10^(15)`
`10^(30)`

Solution :`nFE_("cell")^(@)=2.303TlogK`
`E_("cell")^(@)=(2.303RT)/(nF)log=(0.0591)/(n)logK`
`n=3`
`logK=(0.59xx3)/(0.0591)=29.9`
`K~~10^(30)`.
Discussion
14470.

Which of the following has highest value of radioactivity ?

Answer»

1g of Ra
1 g of `RaSO_(4)`
1g of `RaBr_(2)`
1g of `Ra(HPO_(4))`

Solution :Higher is the concentration of Ra, greater will be the radioactivity. 1g of Ra has MAXIMUM NUMBER of NUCLIDES.
Discussion
14471.

Which of the following is NOT the reason for non-reactivity of noble gases ?

Answer»

COMPLETELY filled valence shell.
Large and positive values of electron gain ENTHAPLY.
Low enthaply of vaporization.
High ionization enthaply

Answer :C
Discussion
14472.

Veronal and lumial are derivatives of barbituric acid which are "……."

Answer»

tranquilizers
non-narcotic analgesic
anti-allergic drugs
NEUROLOGICALLY activedrugs

Solution :Derivatives of BARBITURIC ACID viz.Veronal and luminal are called barbiturates. These barbituates constiute an important class of tranquilizers.
Tranquilizers are a class of CHEMICAL compounds used for the treatement of stress and mild or severs mental diseases. Tranquilizers are neurologically active durgs. These drugs affect the message transfer mechanism from nerve to receptor.
Discussion
14473.

What would happen if a thin slice of sugar beet is placed in a concentrated solution of NaCl

Answer»

SUGAR beet will lose WATER from its CELLS
Sugar beet will absorb water from solution
Sugar beet will NEITHER absorb nor lose water
Sugar beet will dissolve in solution

Answer :A
Discussion
14474.

Which of the following is not used for the preparation of alkyl halides from alcohols ?

Answer»

`Cl_(2)`
`HCl//ZnCl_(2)`
`PCl_(5)`
`SOCl_(2)`

ANSWER :a
Discussion
14475.

What do you mean by selectivity of catalysts?

Answer»

Solution :Selectivity of a CATALYST is its ability to DIRECT a REACTION to yield a PARTICULAR PRODUCT.
Discussion
14476.

Which of the following is an example of nuclear fusion

Answer»

`._(1)H^(2) + ._(1)H^(2) rarr ._(2)He^(4) +` energy
`._(92)U^(235) + ._(0)N^(1) rarr ._(56)BA^(141) + ._(36)KR^(92) + 3 ._(0)n^(1) +` energy
`._(13)Al^(27) + ._(1)H^(1) rarr ._(12)Mg^(24) + ._(2) He^(4)`
None of these

Answer :A
Discussion
14477.

The reagent which easily reacts with ethanol and propanol is

Answer»

FEHLING solution
Grignard reagent
Schiff reagent
Tollen reagent

Solution :`C_(2)H_(5)OH + R-Mg-Xto UNDERSET("ALKANE")(RH)+ C_(2)H_(5)OMgX`
`C_(3)H_(7)OH + R - Mg -X to RH + C_(3)H_(7)OMgX`
Discussion
14478.

Which one of the following compounds is completely miscible with water ?

Answer»

`C Cl_4`
`C_2H_5OH`
`CHCl_3`
`C_6H_6`

ANSWER :B
Discussion
14479.

What will be half-life period of a nucleus if at the end of 4.2 days, N = 0.798 N_(0)

Answer»

15 days
10 days
12.83 days
20 days

Solution :`t = (2.303 XX t_(1//2))/(0.693) "LOG" (N_(0))/(N), N = 0.798 N_(0)`
Discussion
14480.

Which of the following is formed as a result of biological oxidation of benzene in the body of the dog

Answer»

ACRYLIC ACID
Cinnamic acid
Maleic acid
Gluconic acid

Solution :Biological OXIDATION of benzene gives cinnamic acid
Discussion
14481.

Which of the following is not a thermodynamic state function ?

Answer»

Work
Internal energy
Free energy
Temperature

Answer :A
Discussion
14482.

Which of the following will be most readily dehydrate under acidic condition ?

Answer»




Solution :`BETA`- hydroxyly aldehyde or ketone READILY DEHYDRATED under condition to give `alpha, beta`- UNSATURATED aldehyde or ketone.
Discussion
14483.

Which one of the following is the most important characterstic of water to act as a good solvent?

Answer»

Purify of WATER
Ionzing power of water
Polar NATURE of water
Dissolving power of water

SOLUTION :DUE to polar character of its MOLECULE, water has high dielectric constant (82).
Discussion
14484.

When CO_(2) dissolves in water, the following equilibrium is established :for which K_(c )=3.95xx10^(-7)andpH = 6.0.What would be the ratio of [HCO_(3)^(-)]//[CO_(2)] ?

Answer»

`3.95xx10^(-14)`
`0.395`
`9.95xx10^(-7)`
`3.95xx10^(-13)`

ANSWER :B
Discussion
14485.

Which hydroxide will have lowest value of solubility product at normal temperature (25^(@)C)

Answer»

`Mg(OH)_(2)`
`CA(OH)_(2)`
`Ba(OH)_(2)`
`Be(OH)_(2)`

Solution :`Be(OH)_(2)` has LOWEST solubility and hence lowest solubility PRODUCT.
Discussion
14486.

There is no scum formation when hard water is being used. The washing powder can be

Answer»

`C_(17)H_(35)COONA`

Discussion
14487.

What are the various steps involved in extraction of pure metals from their ores ?

Answer»

SOLUTION :Theextractionof puremetalsfrom theconcentratedorestheirores ?
(i)CONVERSIONOF theoreintooxidesof the metalinerest.
(II)REDUCTIONOF the metaloxidesto elementmetals.
Discussion
14488.

Which of the following aqueous solutions is more concentrated [Assume the density of the solution as 1g/ml]

Answer»

1M GLUCOSE
1m Glucose
0.5m Glucose
0.5M Glucose

Answer :A
Discussion
14489.

underset("(mixture of two anions)")A underset("excess of "BaCl_2)overset("Cold")to"white ppt."overset"filtered"to"(Filtrate)" overset"boil"to"White ppt"darr Anion of (A) could be :

Answer»

`SO_(3)^(2-), HSO_(3)^(-)`
`CO_(3)^(2-), SO_(3)^(2-)`
`SO_(3)^(2-), HCO_(3)^(-)`
None of these

Answer :A::C
Discussion
14490.

Why-1 oxidation state is more common in halogens. Explain.

Answer»

Solution :The halogens have a STRONG tendency to gain an electron to give a STABLE halide ION with completely FILLED ELECTRONIC configuration `(ns^(2)sp^(6))` andhence-1 oxidation state is more common in halogens.
Discussion
14491.

What are imperfections or defects in solids ?

Answer»

Solution : At absolute zero temperature, the solids have perfectly ordered arrangement i.e., the state of lowest ENERGY.
At higher temperatures, thisarrangement gets DEVIATED and causes the disorder in the arrangement. Thus, any deviations from perfectly order arrangement of constituent particles in a crystal structure is called IMPERFECTION or defects in a solid.
The IMPERFECTIONS in a crystal structure are mainly of two types :
(i) Atomic defects (II) Electronic defects
Discussion
14492.

Which one of the following ores is best concentrated by froth floation method

Answer»

SIDERITE
GALENA
MALACHITE
Magnetite

Answer :B
Discussion
14493.

The standard potential of the following cell is 0.23 V at 15^@C and 0.21V at 35^@C (Pt) H_2(g) |HCl(aq)|AgCl(s)|Ag(s) Write the cell reaction.

Answer»

SOLUTION :CELL REACTION: `AgCl+1/2H_2=Ag+Cl^(-)+H^+`
Discussion
14494.

Which of the following options is correct regarding C-Obond length?

Answer»

`C_(3)O_(2)gtCOgtCO_(3)^(2-)`
`C_(3)O_(2)ltCOltCO_(3)^(2-)`
`COltC_(3)O_(2)ltCO_(3)^(2-)`
`CO=C_(3)O_(2)=CO_(3)^(2-)`

SOLUTION :B.O. `PROP(1)/("B.L.")`
Discussion
14495.

Which of the following alkyl halides most readily undergoes hydrolysis by S_(N)I mechanism?

Answer»

`CH_(3)CH_(2)CH_(2)Cl`
`CH_(3)Cl`
`(CH_(3))_(2)CHCL`
`(CH_(3))_(3)C Cl`

ANSWER :D
Discussion
14496.

WhenFriedei-Carfts alkylastionof benzene is carried outwith 1 equivalent of tert -butyl chloride, a long amountof para-di-tert-butyl benzeneis formed along with monosubstitutionproduct.Why does not all the bezenereact to give tert - butylbenzene(the momo- substitutionproduct )?

Answer»

Thetert- bustlysubstituentactivate thebenzeneringto furthersubstitution
Thereactionisbimlecular, so twotert-bustlychoridemolecule combinewithone bezenemolecular
Thetert-butyl SUBSTITUENT is largeandfavours REACTIONAT PARA -POSITION .
Thedisbstitutedproduct is favouredin favouredineqilibriumwith mono-substitutedc ring.

Answer :A
Discussion
14497.

When benzene diazonium chloride is heated with methanol, the product is :

Answer»

METHYL BENZENE
PHENYL methyl ether
Methyl BENZOATE
Toluene

Answer :B
Discussion
14498.

What are carboxylic acid ? Discuss general methods of prepara-tion of carboxylic acids.

Answer»


SOLUTION :N//A
Discussion
14499.

Which reagent gives saccharic acid by reacting with glucose ?

Answer»

Fehlig SOLUTION <BR>`HNO_(3)`
`NH_(2)OH`
`Br_(2)` WATER

Solution :`HNO_(3)`
Discussion
14500.

Which one of the following refers to configuration oftransition elements ?

Answer»

2,8,18,3
2,8,18,8
2,8,14,2
2,8,6

Answer :C
Discussion