94420 + Interview Questions in Chemistry in Class 12 Page 555 InterviewSolution

27701.	The Nernst equation for the reduction potential of a non metal A when [A^(n-)] = C is given by
Answer» `E^(0) + (0.059)/(n) log C ` `E^(0) - (0.059)/(n) log C ` `E^(0) + (0.059)/(n) log C^(n)` `E^(0) - (0.059)/(n) log ""(1)/(C)` ANSWER :B

Discussion

27702.	The method used to distinguish optical isomers is
Answer» polarimetry spectroscopy chemical analysis boiling POINT detemination Answer :A

Discussion

27703.	The nernst equation,E = E ^(o) - (RT)/(nF) ln Q indicates that the equilibrium constant K_(C) will be equal to Q when:
Answer» `E= E^(o)` `(RT)/(NF)= 1` `E = 0` `E^(o) = 0` ANSWER :C

Discussion

27704.	The method used for prepare steel is
Answer» Bessemer's convertor method Siemen's MARTIN process Siemen's electric ARC furnance All of the above SOLUTION :All the given methods are USED to manufacture steel.

Discussion

27705.	The Nernst equation , E = E^(0) -(RT)/(nF) . In Q indicatesthat the equilibrium constant K_(c) will be equal to Q when :
Answer» `E=E^(0)` `(RT)/(nF) =1 ` E= zero `E^(0) = 1` SOLUTION :`E = E^(0) - (RT)/(nF)`,At EQUILIBRIUM `DELTAG =0 , :. E =0 , [DeltaG = -nFE]`

Discussion

27706.	The negative value of electron gain enthalpy is less for fluorine than for chlorine.
Answer» SOLUTION :Due to small size the electron-electron repulsions in the relatively compact (small) 2p-subshell of F are comparatively LARGE and hence the incoming electron is not ACCEPTED with the same ease as is the case with the relatively bigger 3p subshell of CI atom. Consequently, the energy released during FORMATION of `F^(-)`(G) form F(g) is little less than during the formation of `CI^(-)`(g) from CI (g) `F(g) + e^(-) rarr F^(-)(g), Delta_(eg) = -333 kJ mol^(-1) and CI(g) + e^(-) rarr CI^(-)(g), Delta_(eg) = -349 kJ mol^(-1)` Thus, negative electron gain enthalpy of F is lower than that of Cl.

Discussion

27707.	The method of zone refining of metals is based on the principle of:
Answer» GREATER mobility of the pure metal than that of impurity higher MELTING point of the impurity than that of the pure metal greater noble CHARACTER of the solid metal than that of the impurity greater SOLUBILITY of the impurity of the impurity in the molten state than in solid Answer :D

Discussion

27708.	The negative value for slope of the graph of concentration of reactant [R]tot indicates…….
Answer» ZERO ORDER REACTION FIRST order reaction INSTANTANEOUS rate both zero order reaction and instantaneous rate. Answer :A

Discussion

27709.	The method of zone refining of metals is based on the priniciple of
Answer» GREATER solubility of the impurities in the molten state than in the solid Greater solubility of PURE metal than that of IMPURITY HIGHER melting point of the impuritythan that of the pure metal Greater noble character of the solid metal than that of the impurity Answer :A

Discussion

27710.	The negative part of the addendum (the molecule to be added adds on to the carbon atom of the double bond containing the least number of hydrogen atoms. This rule is known as
Answer» SAYTZEFF's rule Peroxide rule Markovnikov's rule Hoffmann rule Answer :C

Discussion

27711.	The methodof zonerefining ofmetals is basedon the principleof
Answer» greater mobilityof the puremetalthan that ofthe impurity. HIGHER MELTINGPOINT ofthe impuritythanthatof the puremetal. greater noble of CHARACTER ofthe solid metalthan that of theimpurity greatersolubility oftheimpurity in the moltenstatethan in the solid . ANSWER :D

Discussion

27712.	"The negative part of addenda adds on to the carbon atom linked with least number of hydrogen atoms" This statement is called
Answer» Thiele's principle<BR>Baeyer's STRAIN theory Markownikov's rule Peroxide effect Solution :`CH_3-CH=CH_2+H^(+)Br^(-) to UNDERSET"2-Bromopropane"(CH_3-undersetunderset(Br)(\|)CH-CH_3)`

Discussion

27713.	The method of zone refining of metals is based on the principle of
Answer» greater mobility of pure metal than that of impurity higher MELTING point of the impurity than that of pure metal greater NOBLE character of SOLID metal than that of impurity greater SOLUBILITY of the impurity in the molten state than in the solid. Answer :D

Discussion

27714.	"The negative part of the addendum adds on the carbon atom joined to the least number of hydrogen atoms." This statement is called:
Answer» MARKOWNIKOFF's rule Peroxide effect Baeyer's STRAIN theory Thiele's theory Answer :A

Discussion

27715.	The negative part of an addendum adds on to that carbon atoms which is joined to the least number of hydrogen atoms. This statement is called
Answer» Thiele's THEORY Markowinkoff's rule Peroxide effect Bayer's STRAIN theory ANSWER :B

Discussion

27716.	The method of zone refining of metals is based on the principle of :-
Answer» GREATER mobility of the pure METAL than that of IMPURITY higher melting POINT of the impurity than that of the pure metal Greater noble character of the solid metal than that of the impurity Greater solubility of the impurity in the molten state than in the solid Answer :D

Discussion

27717.	The negative part of an addendum adds on to the carbon atom joined to the least number of hydrogen atoms. This statement is called
Answer» Thiele's theory Peroxide effect Markownikoff's rule Baeyer's STRAIN theory Solution :According to Markownikoff's rule, in case of addition of an unsymnetrical REAGENT (H-X), the positive part get attached to the C which is least substituted or which bears LARGER number of hydrogen atoms. Markownifoff's rule is based on the STABILITY of CARBOCATIONS `(3^(@) gt 2^(@) gt 1^(@) gt ` methyl).

Discussion

27718.	The negative inductive effect is shown by :
Answer» `-CH_(3)` `-COOH` `-CH_(2)CH_(2)` `-CHR_(2)`. Answer :B

Discussion

27719.	The method of zonc refining of metals is based on the principle of
Answer» GREATER mobility of the pure metal than that of the impurity higher melting POINT of the impurity than that of the pure metal greater noble CHARACTER of the solid metal than that of the impurity greater SOLUBILITY of the impurity in the molten STATE than in the solid. Answer :D

Discussion

27720.	The negative electron gain enthalpy values of N, O, S and Cl are in the order:
Answer» O < CL < N < S O < S < Cl < N N < O < S < Cl O < N < Cl < S Answer :C

Discussion

27721.	The negative E^(@) values shows that the reactoins are ....................... .
Answer» SOLUTION :Non-spontaneous

Discussion

27722.	The method of preparing an optically active compound from symmetric molecules under the influence of some optically active substance is called :
Answer» Resolution Asymmetric SYNTHESIS OPTICAL inversion Biochemical SEPARATION ANSWER :B

Discussion

27723.	The negative electron gain enthalpy values of halogens follows the order:
Answer» 1.F,CL,BR, I 2 .F,Br,Cl,I 3. Cl,Br,I,F 4. Cl,F,Br,I Solution :NEGATIVE electron gain enthalpy becomes lessnegative down the group but florine has abnormaly lower negative value than CHLORINE.

Discussion

27724.	The necessary condition for halogenation are
Answer» LOW temperature darkness the PRESENCE of HALOGEN carrier all of these Answer :C

Discussion

27725.	The negative catalyst in the decomposition of H_2O_2 is ..............
Answer» ETHANOL Acetic ACID ETHANOIC acid METHANOL Solution :Ethanol

Discussion

27726.	The method of choice for determining the molecular weight of polymer is:
Answer» Osmotic pressre Gas density LOWERING of FREEZING point Direct weighing of a single molecule Solution :Osmotic pressure method is best for the determination of molecular weight of polymers and Proteins since`O.P.`through very small,It measurable On the other hand,in other colligative properties (e.g.,DeltaT_(B),DeltaT_(F),Deltap//p^(@)`methods),The difference is very small and cannot be measured.Moreover ,in `O.P.`method ,heating is not required while in other methods,heating is required which CHANGES the properties of polymer and proteins.

Discussion

27727.	The necessary condition for a compound to form fibre is
Answer» its moleculesmust be linear its molecules must be spherical its molecules must be rectangular its moleculesmust be hexagonal SOLUTION :Firbre is linear polymer. This NECESSARY CONDITION for a compound to FORM fibre is that its molecules must be linear.

Discussion

27728.	The method of choice for determining the molecular weight of a polymer is
Answer» OSMOTIC pressure gas density lowering of FREEZING point direct WEIGHING of a SINGLE molecule Answer :A

Discussion

27729.	The necessary and sufficient condition for a molecule to exhibit optical activity is _________.
Answer» molecular symmetry molecular ASYMMETRY or chirality presence of UNSATURATED carbon ATOMS tetrahedral NATURE of carbon atoms Answer :B

Discussion

27730.	The method not used in metallurgy to refine the impure metal is .......
Answer» MOND's PROCESS Van-Arkel process AMALGAMATION process Zone-refining ANSWER :C

Discussion

27731.	The nearest neighbouring silver atoms in the silver crystals are 2.87 xx 10^(-10) m apart. What is the density of silver ? Silver crystallises in fcc form. [Atomic mass of Ag = 108]
Answer» Solution :Nearest neighbours if fcc crystal `=(1)/(2)XX" FACE diagonal"=(1)/(2)(sqrt2a)` `"or"2.87xx10^(-10)m=(a)/(sqrt2)` `"or"a=2.87xx1.414xx10^(-10)=4.05xx10^(-10)m=4.05xx10^(-8)cm` `"orVolume "=a^(3)=(4.05)^(3)xx10^(-24)` Use the following equation to CALCULATE d `d=(zxxM)/(a^(3)xxN_(A))=(4xx108)/((4.05)^(3)xx10^(-24)xx6.023xx10^(23))=(108)/(1.008xx10)=(108)/(10.08)="10.7 G cm"^(-3)`

Discussion

27732.	The method for the purification of impure metals which I based upon the phenomenon of electrolysis is called
Answer» ELECTROREFINING Hydrometallurgy Polling Liquation. Solution :Electrorefining

Discussion

27733.	The methodfor the purification of impure metals which is based upon the phenomenon of electrolysis is called :
Answer» ELECTROREFINING HYDROMETALLURGY POLING LIQUATION ANSWER :A

Discussion

27734.	The natures of the oxides CrO and CrO_3, respectively
Answer» ACIDIC and basic basic and AMPHOTERIC amphoteric and basic basic and acidic Answer :D

Discussion

27735.	The method for converting precipitates in to colloidal particles by stirring them in a dispersion medium in presence of electrolyte is called ...........
Answer» FLOCCULATION COAGULATION PEPTIZATION EMULSIFICATION SOLUTION :peptization

Discussion

27736.	The nature of pi-bond present in oxy acids of Cl is
Answer» `ppi-ppi` BOND `dpi-dpi` bond `ppi-dpi` bond `dpi-fpi` bond Answer :C

Discussion

27737.	The method by which aniline cannot be prepared is …………………………………..
Answer» degradation of benzamide with `Br_(2)//NaOH`<BR>potassium SALT of phthalimide treated wit chlorobenzene FOLLOWED by HYDROLYSIS with AQUEOUS NaOH solution. Hydrolysis of phenylcynanide with acidic solution reduction of nitrobenzene by Sn/HCl Solution :potassium salt of phthalimide treated with chlorobenzene followed by hydrolysis with aqueous NaOH solution.

Discussion

27738.	The nature of phosphine is
Answer» acidic basic neutral amphoteric Answer :B

Discussion

27739.	The method commonly employed for the destruction of colloidal solution is:
Answer» ADDITION of electrolytes diffusion through ANIMAL MEMBRANE condensation dialysis. ANSWER :A

Discussion

27740.	The nature of PbO is:
Answer» Basic Acidic Amphoteric Neutral Answer :C

Discussion

27741.	The method by which aniline cannot be prepared is
Answer» degradation of benzamide with `Br_(2)//NaOH` potassium salt of phthalimidetreated with chlorobenzene FOLLOWEDBY HYDROLYSIS with aqueous NaOH solution. Hydrolysis of phenylcyanide with ACIDIC solution reduction of NITROBENZENE by Sn/HCl Solution :potassium salt of phthalimidetreated with chlorobenzene followedby hydrolysis with aqueous NaOH solution.

Discussion

27742.	The nature of CrO and Cr_2O_3 is respectively
Answer» BASIC, Amphoteric Basic, Basic Amphoteric, Acidic Acidic, Basic Answer :A

Discussion

27743.	The metals which produce hydrogen only with very dilute nitric acid are
Answer» Zn Sn MG MN Solution :`Mg, Mn`

Discussion

27744.	The nature of foces involved in physical adsorption are ………..
Answer» SOLUTION :VAN DER WALLS ISOTHERM

Discussion

27745.	The metals which cannot be obtained by electrolysis of aqueous solution of their salts are
Answer» Ag Mg Cu Al Answer :B::D

Discussion

27746.	The metals which produce hydrogen only with very dilute nitric acid are:
Answer» Zn Sn Mg Mn Answer :C::D

Discussion

27747.	The nature of forces operating between the adsorbate and the adsorbent in the adsorption occuring at high temperature is
Answer» VAN DER WAALS forces Chemical forces Gravitational forces Fermi forces Answer :B

Discussion

27748.	The metal(s) soluble in aqua regia is (are)
Answer» Pt Au Ag Cu Answer :A::B::C::D

Discussion

27749.	The nature of CsAuCl_(3) is (this compound contains Au in two oxidation states and there is no Au-Au bond) :
Answer» diamagnetic paramagnetic ferromagnetic antiferromagnetic Solution :`Cs^(+)(AuCl_(3)) implies Cs[AuCl_(2)]+Cs[AuCl_(4)]` ACCORDING to the question Au exists two oxidation STATES, i.e., Au exists in `+1" and "+3` `Au^(+)=d^(10)` `Au^(+++)=d^(8)` Both CASES exist in diamagnetic form.

Discussion

27750.	The metals near the bottom of the electro chemicals series are
Answer» STRONG REDUCING agents strong OXIDISING agents weak reducing agents weak oxidising agents Answer :A

Discussion

Explore topic-wise InterviewSolutions in .

The Nernst equation for the reduction potential of a non metal A when [A^(n-)] = C is given by

The method used to distinguish optical isomers is

The nernst equation,E = E ^(o) - (RT)/(nF) ln Q indicates that the equilibrium constant K_(C) will be equal to Q when:

The method used for prepare steel is

The Nernst equation , E = E^(0) -(RT)/(nF) . In Q indicatesthat the equilibrium constant K_(c) will be equal to Q when :

The negative value of electron gain enthalpy is less for fluorine than for chlorine.

The method of zone refining of metals is based on the principle of:

The negative value for slope of the graph of concentration of reactant [R]tot indicates…….

The method of zone refining of metals is based on the priniciple of

The negative part of the addendum (the molecule to be added adds on to the carbon atom of the double bond containing the least number of hydrogen atoms. This rule is known as

The methodof zonerefining ofmetals is basedon the principleof

"The negative part of addenda adds on to the carbon atom linked with least number of hydrogen atoms" This statement is called

The method of zone refining of metals is based on the principle of

"The negative part of the addendum adds on the carbon atom joined to the least number of hydrogen atoms." This statement is called:

The negative part of an addendum adds on to that carbon atoms which is joined to the least number of hydrogen atoms. This statement is called

The method of zone refining of metals is based on the principle of :-

The negative part of an addendum adds on to the carbon atom joined to the least number of hydrogen atoms. This statement is called

The negative inductive effect is shown by :

The method of zonc refining of metals is based on the principle of

The negative electron gain enthalpy values of N, O, S and Cl are in the order:

The negative E^(@) values shows that the reactoins are ....................... .

The method of preparing an optically active compound from symmetric molecules under the influence of some optically active substance is called :

The negative electron gain enthalpy values of halogens follows the order:

The necessary condition for halogenation are

The negative catalyst in the decomposition of H_2O_2 is ..............

The method of choice for determining the molecular weight of polymer is:

The necessary condition for a compound to form fibre is

The method of choice for determining the molecular weight of a polymer is

The necessary and sufficient condition for a molecule to exhibit optical activity is _________.

The method not used in metallurgy to refine the impure metal is .......

The nearest neighbouring silver atoms in the silver crystals are 2.87 xx 10^(-10) m apart. What is the density of silver ? Silver crystallises in fcc form. [Atomic mass of Ag = 108]

The method for the purification of impure metals which I based upon the phenomenon of electrolysis is called

The methodfor the purification of impure metals which is based upon the phenomenon of electrolysis is called :

The natures of the oxides CrO and CrO_3, respectively

The method for converting precipitates in to colloidal particles by stirring them in a dispersion medium in presence of electrolyte is called ...........

The nature of pi-bond present in oxy acids of Cl is

The method by which aniline cannot be prepared is …………………………………..

The nature of phosphine is

The method commonly employed for the destruction of colloidal solution is:

The nature of PbO is:

The method by which aniline cannot be prepared is

The nature of CrO and Cr_2O_3 is respectively

The metals which produce hydrogen only with very dilute nitric acid are

The nature of foces involved in physical adsorption are ………..

The metals which cannot be obtained by electrolysis of aqueous solution of their salts are

The metals which produce hydrogen only with very dilute nitric acid are:

The nature of forces operating between the adsorbate and the adsorbent in the adsorption occuring at high temperature is

The metal(s) soluble in aqua regia is (are)

The nature of CsAuCl_(3) is (this compound contains Au in two oxidation states and there is no Au-Au bond) :

The metals near the bottom of the electro chemicals series are