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.

20751.

Which of the following is fully fluorinated polymer

Answer»

NEOPRENE
TEFLON
THIOKOL
PVC

Answer :B
Discussion
20752.

The solubility product of a compound MX is 2.5xx10^(-9) at 25^(@)C. Its solubility at 25^(@)C is :

Answer»

`2.5 XX 10^(-5)`
`5 xx 10^(-5)`
`5 xx 10^(-4)`
`2.5 xx 10^(-6)`

ANSWER :B
Discussion
20753.

What are thermoplastic polymers? Give an example.

Answer»

Solution :THERMOPLASTIC polymers: Those polymers (linear or slightly) branched long chain molecules) which are CAPABLE of softening on heating and hardnening on cooling are called thermoplastic. These polymers posses intermolecular forces of ATTRACTION intermediate between clastomer and fibres.Example are polythene,polyvinyI chloride,polystyrene,etc.
Thermostting polymers: Those polymers (cross-linked or HEAVILY branched molecules) which on heating do not soften and cannot be remoulded are called thermosetting polymers. On heating they undergo extensive cross-linking in moulds and BECOMES infusible, Example are bakelite formaldehyde resin etc.
Discussion
20754.

The Van't Hoff factor calculated from association data is always … than calculated from dissociation data

Answer»

LESS
More
Same
More or less

ANSWER :A
Discussion
20755.

The temperature dependence of rate constant(k) of a chemical reaction is written in terms of Arrenius equation, k=A*e^(-E_(a)) Activation energy (E_(a)) of the reaction can be calculated by plotting

Answer»

`kVs(1)/(lagT)`
`"log"K Vs(1)/(T)`
`"log"kVs (1)/("log"T)`
`k Vs T`

Solution :`k=Ae^((-E_(a))/(RT))"log"k="log"A-(E_(a))/(2.303R)(1)/(T)`
plot of `"log"KVs(1)/(T)`
Straight line SLOPE`=(-E_(a))/(2.303R)`
Discussion
20756.

Which of the following represents outermost shell electronic configuration of halogens

Answer»

<P> `s^(2)p^(3)`
`s^(2)p^(6)`
`s^(2)p^(4)`
`s^(2)p^(5)`

ANSWER :D
Discussion
20757.

Zinc granules are added in excess to 500mL of 1M nickel nitrate solution at 25^@C until the equilibrium is reached. If the standard reduction potentials of Zn^(2+)|Zn and Ni^(2+)|Ni are -0.75V and -0.24V respectively, find out the concentration of Ni^(2+) in solution at equilibrium.

Answer»

SOLUTION :The cell REACTION for the cell
`Zn,Zn^(2+)||Ni^(2+), Ni` is
`Zn+Ni^(2+) leftrightarrow Zn^(2+)+Ni` for which
`E_(cell)=E_(cell)^@-0.0591/2 log""([Zn^(2+)])/([Ni^(2+)])`
At equilibrium `E_(cell)=0`
`therefore E_(cell)^@=0.0591/2 log""([Zn^(2+)])/([Ni^(2+)])`
`E_(Ni^(2+))^@,Ni-E_(Zn^(2+))^@, Zn=0.0591/2 log""([Zn^(2+)])/([Ni^(2+)])`
`=-0.24-(-0.75)= 0.0591/2 log""([Zn^(2+)])/([Ni^(2+)])`
`log""([Zn^(2+)])/([Ni^(2+)])=17.259`
TAKING antilog
`([Zn^(2+)])/([Ni^(2+)])=1.816 times 10^17`
This concentration ratio shows that almost whole of the `Ni^(2+)` ions are reduced to Ni and therefore the concentration of `Zn^(2+)` PRODUCED from Zn would be nearly 1M `[because Ni(NO_3)_2=1M]` Thus,
`1/([Ni^(2+)])=1.816 times 10^17`
or `[Ni^(2+)]=5.5 times 10^-18 M`
Discussion
20758.

What is the bond angle in SO_2?

Answer»

SOLUTION :`SO_2` has a BENT STRUCTURE and BOND ANGLE in `SO_2` is `119.5^@`
Discussion
20759.

Which of the following statements is correct about the reaction given below : 4Fe(s)+3O_(2)(g) rarr 2Fe_(2)O_(3)(s)

Answer»

Total MASS of iron and oxygen in REACTANTS = total mass of iron and oxygen in PRODUCT therefore it follows law of conservation of mass.
Total mass of reactants = total mass of product , therefore, law of multiple PROPORTIONS is followed
Amount of `Fe_(2)O_(3)` can be INCREASED by taking one of the reactants (iron or oxygen) in excess.
Amount of `Fe_(2)O_(3)` produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess.

Solution :Statement (a) is correct according to law of conservation of mass.
Discussion
20760.

Vitamin B_1 is chemically known as :

Answer»

ASCORBIC acid
Riboflavin
PYRIDOXINE
Thiamine

Answer :D
Discussion
20761.

Two minerals(X) and (Y)areconcentrated byflothfloatationprocess.Onroastingmineral (X)gavea shiningliquidmetal(Z )whilemineral(Y) undersimilarconditiongaveametaloxide (P) whichwasyellow whenhot and whilewhencold. Reduction of theoxide(P) withe cokegavemetal (Q).Identify the minerals(X) and (Y), the oxide(Z) and metals (P) and(Q).

Answer»

Solution :(i) Sincethe minerals(X) and(Y) are concentrated by flothfloatation process, they must besulphideores.
(ii) Sincethe SULPHIDE ore (X) onroastinggives thecorrespondingshiningliquid METAL (Z),THEREFORE, (Z) must beHg andthethe sulphidemineral (X)mustbecinnobar ,i.e.,HgS.
`underset("Cinnabar(X)") ( 2 HgS)+3 O _ 2overset (Delta ) to2HgO+2 SO_ 2 `
`2 HgO+HgSoverset ( Delta ) tounderset ("Mercury(Z)")( 3Hg )+SO_ 2`
(iii) Since thesulphidemineral (Y) onroasting gavean oxide (P) which was yellowwhen hotand whitewhen cold,therefore,metaloxide (P) must bezinc oxide (ZNO).
FurthersinceZnO on reductionwithcokegavethemetal(Q),therefore, metal (Q) must be zinc (Zn) andthesulphidemineral (Y) mustbe zinceblende,ZnS.
`underset ( "Zincblende (Y)") ( 2 Zn S)+3O_2overset (Delta ) to2 Z n O+2SO_ 2 `
`ZnO+Coverset (Delta )to underset ( "Zinc (Q)")(Zn) + CO`
Thus,P=HgS, Y= ZnS, Z = Hg, P=ZnOand Q = Zn.
Discussion
20762.

Which of the following will have C=O bond length almost similar to C-O bond length?

Answer»




`O=C=O`

ANSWER :A::B
Discussion
20763.

Which of the following compounds is responsible for the transmission of heredity characters:

Answer»

RNA
DNA
Glucose
Haemoglobin

Answer :B
Discussion
20764.

White of an egg whipped with water acts as

Answer»

MACROMOLECULAR colloid
associate colloids
molecular colloids
normal ELECTROLYTIC solution.

Answer :A
Discussion
20765.

Write the overall reaction taking place in the process used for the electrolysis of alumina by Hall-Heroult's process.

Answer»

SOLUTION :The overall REACTION is :
`2Al_(2)O_(3)+ 3C to 4AL+ 3CO_(2)`.
Discussion
20766.

Which one of the following is the other name of d-block elements?

Answer»

Chalcogens
Halogens
Inner-TRANSITION ELEMENTS
Transition elements

Solution :Transition elements
Discussion
20767.

Which of the following modes of expressing concentration is independent of temperature

Answer»

Molarity
Molality
FORMALITY
Normality

ANSWER :B
Discussion
20768.

Which of the following is an example of zeolite

Answer»

`MgCl_2`
`CA(OH)_2`
`ZSM-5`
`CAN`

ANSWER :C
Discussion
20769.

Trimethyl amine oxide and trimethyl phosphine oxide can be represented as (CH_3)_3N^(+)-O^(-) , (CH_3)_3P^(+)-O^(-) Answer the following questions based on these Triphenyl Phosphine oxide can be respectively by two canonical forms but trimethyl amine oxide can't be (CH_3)_3P^(+) - O^(-) harr (CH_3)_(3)P=O It is due to

Answer»

Phosphorus ACCEPTS charge density from oxygen and accomodates it in its vacant d - orbitals
NITROGEN does not POSSES d - orbitals and thus can't FORM the `pi` - bonded structure
Both (a) and (B)
None forms canonical forms

Solution :
Discussion
20770.

Which one among the following pairs of ions cannot be separated by H_(2)S in dilute hydrochloric acid ?

Answer»

`BI^(3+),SN^(4+)`
`Al^(3+),Hg^(2+)`
`Zn^(2+),Cu^(2+)`
`NI^(2+),Cu^(2+)`

Answer :B
Discussion
20771.

Trimethyl amine oxide and trimethyl phosphine oxide can be represented as (CH_3)_3N^(+)-O^(-) , (CH_3)_3P^(+)-O^(-) Answer the following questions based on theseTrimethyl Phosphine oxide is stable because

Answer»

<P>It has two resonating structures
P = O has HIGH dissociation energy
Both (a) and (b)
None

SOLUTION : Triphenyl phossphine is stable because of high BOND dissociation energy of P = 0 and it.s caninical FORMS as shown in the above equation
Discussion
20772.

When we heat a gas sample from 27°C to 327°C. then the initial average kinetic energy, of the molecules was E. What will be the average kinetic energy after heating ?

Answer»

Doubled
Halved
Multiplied by the factor 327 `//` 27
Raised to the POWER two .

SOLUTION :K.E. is proportional to T so that
`( KE_(1))/( KE_(2)) = ( 300)/( 600)`
or `KE_(2) = 2KE_(1)`
Discussion
20773.

Which of the following curves does not represent Boyle's law ?

Answer»




ANSWER :D
Discussion
20774.

Which of the following elements form an insoluble carbonate salt?

Answer»

NA
BA
Mg
K

ANSWER :B
Discussion
20775.

which of the following is the incorrect match for atom of element?

Answer»

`[Ar]3d^(5)4s^(2) to 4^(th)"period",6^(th)` group
`[Kr]4d^(10) to 5^(th" period, "12^(th)` group
`[Rn]6d^(1) 7s^(2) to 7^(th)` period, 3th group
`[Xe]4f^(14)5d^(2)6s^(2) to `6TH period, 4TH group

Solution :`[Xe]4f^(14)5d^(2)6s^(2) to HF (72) to 6^(th)` period, `4^(th)` group.
Discussion
20776.

Xunderset((ii)H_3O^(o+))overset((i)KMnO_4//H_2O // Delta)toHOOC-oversetoverset(O)(||)C-CH_2-CH_2-CH_2-CH_2-COOH X may be

Answer»




SOLUTION :
Discussion
20777.

The relative abundance of two isotopes of atomic masses 85 and 87 are 75% and 25% respectively. The average atomic mass of element is:

Answer»

86
40
85.5
75.5

Answer :C
Discussion
20778.

What is absolute alcohol?

Answer»

SOLUTION :`100%` pure ETHYL ALCOHOL is CALLED absolute alcohol.
Discussion
20779.

Which are ionic compounds?

Answer»

`ZnCl_(2)`
`LICI`
 `HgCl_(2)`
 `AgCI`

Answer :A::D
Discussion
20780.

The volume of one molecule of water is (density of water = 1 g ml^(-1)) about

Answer»

`3.0 xx 10^(-23) ML`
`6.02 xx 10^23 mL`
`1.0 xx 10^(-24) mL`
1mL

Solution :`6 xx 10^23` molecules of water = 18 g
= 18 ml
1 molecule of water
`= (18)/(6 xx 10^23) = 3 xx 10^(-23) ml `
Discussion
20781.

The structure of Fe_(2)Cl_(6) is best represented as :

Answer»

`[FeCl_(2)]^(+) [FeCl_(4)]^(-)`


SOLUTION :It EXISTS as a dimer.
Discussion
20782.

Whichisomerismis notpresentin amines ?

Answer»

FUNCTIONAL
position
chain
Cis and trans

Solution :Cistrans isomerismis possiblein thatcompoundcontaining `C = C, C = N, N = N` . Aminesare singlebondedcompounds.
Discussion
20783.

What is electrode potential ?

Answer»

Solution :A potential DIFFERENCE developing between the ELECTRODE and the electrolyte is KNOWN is electrode potential.
Discussion
20784.

Which of the followingstatementregarding an orbital is correct ?

Answer»

an ORBITAL isa definite trajectory aroundthe nucleus in which electron can move
an orbital ALWAYS has spherical trajectory
it is the region aroundthe nucleus where there is 90 to 95% probability of finding all the electrons in an atom
an orbital is characterized by three distnict quantum number N , l andm

ANSWER :D
Discussion
20785.

What is the difference between saccharin and saccharic acid ?

Answer»

Solution :Saccharin is an ARTIFICIAL sweetener.Saccharic ACID, on the other HAND is a dibasic acid obtained by BACTERIAL oxidation of glucose in the mouth or by conc. `HNO_3` in the Laboratory.
`underset"Glucose"(CH_2OH(CHOH)_4CHO) underset("on Conc." HNO_3)overset"Bacterial oxidation"to underset"Saccharic acid"(HOOC-(CHOH)_4-COOH)`
Discussion
20786.

The resonating structures:

Answer»

DIFFER only in the arrangement of electrons
Differ in number of PAIRED and UNPAIRED electrons
Differ largely in their energy contents
Do not lie in the same plane

Answer :A
Discussion
20787.

Which metal is used in preparation of tubes of boiler?

Answer»

MG 
Cu 
PT 
Ni 

ANSWER :B
Discussion
20788.

What is the state of hybridization of nitrogen in NO_3^(-)ion ?

Answer»

SOLUTION :`sp^2`HYBRIDIZATION
Discussion
20789.

Two liquids A and B from an ideal solution. At 300K, the vapour pressure of a solution containing 1 mole of A and 3 moles of b is 550mmHg. At the same temperature, if one mole of B is added to this solution, the vapour pressure of the solution increases by 10mmHg. Determine the vapour pressure of A and B in their pure states.

Answer»

Solution :Mole FRACTION of A `=(1)/(1+3)=(1)/(4)`
Mole fraction of B `=(3)/(1+3)=(3)/(4)`
Applying EQN. 3 we get,
`550=(1)/(4)xxp_(A)^(0)+(3)/(4)p_(B)^(0)`…………..(1)
When ONE more mole of B was ADDED to the solution,
Mole fraction of A `=(1)/(1+4)=(1)/(5)`
Mole fraction of B `=(4)/(1+4)=(4)/(5)`
Again applying Eqn. (3) , we get
`550+10=(1)/(5)p_(A)^(0)+(4)/(5)p_(B)^(0)` ................(2)
From (1) and (2), we get
`p_(A)^(0)=440mm`
`p_(B)^(0)=600mm`
Discussion
20790.

What is Green house effect ? How does it affect the global climate ?

Answer»

Solution :Atmosphere around the earth acts like a glass of the green house CHAMBER. The gases PRESENT in the atmosphere which cause green house effect are referred to as green house gases. The various green house gases are :
`CO_(2), H_(2)O` vapour, chlorofluoro carbons and oxides of nitrogen.
The green house gases in the atmosphere form a thick cover around the earth. The earth receives a large amount of energy from the sun. The IR radiations coming from sun are not ABSORBED by atmospheric gases. The earth absorbs these IR radiations of short WAVELENGTH.
As a results of this the temperature of earth stands rising. Eventually , earth starts emitting INFRARED radiations of longer wavelengths. Th partially radiated infra red radiations from the earth are absorbed by `CO_(2)`. This results in excessive heating of earths atmosphere.
Discussion
20791.

Which out of isomeric amines has highest boiling point and why?

Answer»

Solution :Out of isomeric amines, PRIMARY amine has the highest boiling POINT because of its LARGEST tendency to form hydrogen BONDS.
Discussion
20792.

Which of the following is most electropositive?

Answer»

I
Mg
Cs
Li

Answer :C
Discussion
20793.

The repeating structural units of a polymer molecule are called________.

Answer»

SOLUTION :MONOMERS
Discussion
20794.

Which of the following is not used as anesthetic agent?

Answer»

DIETHYL ether
Nitrous oxide
Haloethane
Methanol

Answer :D
Discussion
20795.

Using the standard electrode potential , find out the pair between which redox reaction is not feasible . E^(v)"values":Fe^(3+)|Fe^(2+)=+0.77,I_(2)|I^(-)=+0.54,Cu^(2+)|Cu=+0.34,Ag^(+)|Ag=+0.80V

Answer»

`FE^(3+)ANDI^(-)`
`AG^(+)andCu`
`Fe^(3+)andCu`
`AgandFe^(3+)`

ANSWER :D
Discussion
20796.

Which of the following process is used in the synthesis of acetone?

Answer»

CANNIZZARO's reaction
Wurtz reaction
Friedel Craft's reaction
Rosenmund's reaction

Solution :Friedel Craft's reaction is used to PREPARE isopropyl BENZENE from which acetone is OBTAINED by oxidation followed by hydrolysis.
Discussion
20797.

Which of the following curve is in accordance with Freundlich adsorption isotherm ?

Answer»




ANSWER :C
Discussion
20798.

Which is incorrect order of –I

Answer»

`F GT CL gt BR gt I `
` –NR gt –NH gt –NO 332 `
` –OCH3gt –OH gt –NH`

Answer :B
Discussion
20799.

Which combines with Fe^(+2) to form brown complex

Answer»

`N_(2)O`
NO
`N_(2)O_(3)`
`N_(2)O_(5)`

ANSWER :B
Discussion
20800.

Which of the following functional groups can not be reduced by H_2 / Ni

Answer»

R-CHO
R-COOH
R-COO-R
R-CO-R

ANSWER :B
Discussion