94420 + Interview Questions in Chemistry in Class 12 Page 509 InterviewSolution

25401.	The process which does not evolve CO_2 in air is :
Answer» Burning Breathing Organic decay Photosynthesis Answer :D

Discussion

25402.	The processusedin therefiningof aluminimumand zincmetalsare repsectively
Answer» Hoope'sprocess and FRACTIONALDISTILLATION Hoope's PROCESS andcupellation Polingand fractionaldistillation Cupellationand fractionaldistillation ANSWER :A

Discussion

25403.	The process used in obtaining metallic silver from argentite is :
Answer» FUSED mixturte of `Ag_2S` and KCL is electrolysed `Ag_2S` is reduced with CO `Ag_2S` is roasted to `Ag_2O` which is reduced with C TREATING with NACN solution following by metal displacment with zinc Answer :D

Discussion

25404.	The process used in converting hydrated Alumina into anhydrous alumina is called
Answer» ROASTING Calcination Smelting Dressing Answer :B

Discussion

25405.	The process used in conversion of triolein to tristerin is
Answer» Hydrolysis Hydration Hydrogenation Dehydrogenation Solution :Triolein is an UNSATURATED glyceride while tristerin is a saturated glyceride . Hence, the CONVERSION of triolein to tristerin can be AFFECTED by hydrogenation. Triolein `+H_(2) overset(NI)to ` Tristerin.

Discussion

25406.	The process used for purification of bauxite ore containing high silica content as impurity is :
Answer» BAEYER's process Serpeck's process Hoope's process Hall's process Answer :B

Discussion

25407.	The process that does not yield an amine is
Answer» Action of AMMONIA on Rx REDUCTION of aldoxime with Na/alcohol ACID hydrolysis of alkyl cyanide Reduction of amide with LAH Answer :C

Discussion

25408.	The process used for purification of bauxite ore containing iron oxide impurity is known as :
Answer» BAEYER's process Hoope's process Serpeck's process Electrolytic process Answer :A

Discussion

25409.	The process requiring the adsorption of :
Answer» `FrarrF^-` `HrarrH^-` `Clrarr CL^-` `Orarr O^-` ANSWER :D

Discussion

25410.	The process requiring the absorption of energy is:
Answer» `FtoF^(-)` `Cl to Cl^(-)` `O^(-)toO^(2-)` `HtoH^(-)` SOLUTION :The PROCESS `O^(-)toO^(2-)`requried ABSORPTION of ENERGY because of repulsion.

Discussion

25411.	The process requiring absorption of energy is:
Answer» `N to N^(-)` `F to F^(-)` `Cl to Cl^(-)` `H to H^(-)` Solution :Nitrogen has stable `2p^(3)` CONFIGURAITON and also due to HIGH `e^(-)` charge density at outermost orbital it requires energy to add one EXTRA `e^(-)` in its outer most shell i.e., its first electron gain enthalpy is positive.

Discussion

25412.	The process/processes by which lighter earthy particles are freed from the heavier particles using water is/are
Answer» GRAVITY separation LEVIGATION HYDRAULIC washing leaching Answer :A::B::C

Discussion

25413.	The process ofcorrosion ofiron is known as rusting. Rust appears to be a hydrated ferricoxide Fe_2O_3, xH_2O, Both O_2 & H_2O are required for rusting. Iron can be protected from the rusting by use of following compounds. i) Applying paints, lacquers and enamells on the surface ofiron ii) By forming a firm and coherent protective coating of ferroroferric oxide. This is done by passing steam over hot iron iii) By coating a thin film of Zinc, Tin, Nickel, chromium, aluminium etc, on the surface of iron If plated with Zinc, the reaction of products of Zinc with O_2 and H_2O form a coating which sticks to the surface and there by protects iron Zinc protects iron from corrosion because
Answer» It is an active metal A STICKY coating is FORMED on its surface on exposure to AIR It is not affected by atmosphere It has LOWER oxidation potential than iron Solution :Zno layers , form on FE

Discussion

25414.	The process photosynthesis cannot occur in the absence of :
Answer» CHLOROPHYL OXYGEN Catalyst None ANSWER :A

Discussion

25415.	The processs of zone refining is used in the purifications of
Answer» AL GE Cu Ag Answer :B

Discussion

25416.	The process of zinc-plating on iron sheet is known as
Answer» Aneling Roasting Galvanization Smelting Solution :The process of ZINC PLATING on IRON sheet is KNOWN as galvanization.

Discussion

25417.	The process of using an electric current to bring about chemical change is called electrolysis.Electrolysis is a processes of oxidation and reduction at the respective electrodes due to external current passed in the electrolyte. The product obtained during electrolysis depends on following factors. The nature of the electrolyte The concentration of electrolyte The nature of the electrode. Consider the electrolysis of following cell containing aq. solution of CuSO_4,ZnCl_2 and MBr_2 by using pure silver rod as a cathode and Pt electrode as anode.Assume that M^(2+) does not further oxidise and can not form complex with NH_3 Assume no hydrolysis of any ion. E_(Cu^(2+)//Cu)^(0)=0.35 V, E_(M^(2+)//M)^(0)=-0.10 V, E_(Zn^(2+)//Zn)^(0)=-0.76 V, E_(H_(2)O // H_2)^(0)=-0.828 V, E_(Ag^(+)//Ag)^(0)=0.80 V, (2.303RT)/F=0.06 If 36 mol of NH_(3)(g) is passed in electrolytic solution given in comprehension (assume no volume change by addition of NH_(3)),then what would be decreasing order of reduction potential of following :
Answer» `M^(2+)gtCu^(2+)gtZn^(2+)` `CU^(2+)gtM^(2+)gtZn^(2+)` `M^(2+)gtZn^(2+)gtCu^(2+)` `Cu^(2+)gtM^(2+)gtZn^(2+)` Solution :`{:(Zn^(2+)+ 4NH_3 hArr Zn(NH_3)_4^(2+)" " K_f=1xx10^(9)),(1 "" 18),(1-x " " 18-4x-4y " " x):}` `Zn^(2+)=(Zn(NH_3)_4^(2+))/(K_f[NH_3]^4)=1/(10^9xx10^4)=10^(-)13` For `Zn^(2+)+2e^(-)toZn(s)` `E_(R.P)=-0.76-0.06/2"log"1/10^(-13)=-0.76-0.06xx13/2=-1.15 V` `{:(Cu^(2+)+ 4NH_3 hArr Cu(NH_3)_4^(2+)" " K_f=1xx10^(12)),(1 "" 18),(1-x " " 18-4x-4y " " y):}` `[Cu^(2+)]=(Cu(NH_3)_4^(2+))/(K_f[NH_3]^(4))=10^(-16)` For `Cu^(2+)+2e^(-)TOCU(s)` `E_(R.P)=-0.34-0.06/2"log"1/10^(-16)=-0.34-0.06xx8=-1.14 V`

Discussion

25418.	The process of which alum purifies turbid water is -
Answer» absorption Adsorption Coagulation Dispersion Answer :C

Discussion

25419.	The process of vulcanization was introduced by ...............
Answer» ANSWER :CHARLES GOODYEAR

Discussion

25420.	What is natural rubber ? What is vulcanisation of rubber ? How is it carried ?
Answer» WOHLER Volta Charles GOOD Year Zeigler ANSWER :C

Discussion

25421.	The process of using an electric current to bring about chemical change is called electrolysis.Electrolysis is a processes of oxidation and reduction at the respective electrodes due to external current passed in the electrolyte. The product obtained during electrolysis depends on following factors. The nature of the electrolyte The concentration of electrolyte The nature of the electrode. Consider the electrolysis of following cell containing aq. solution of CuSO_4,ZnCl_2 and MBr_2 by using pure silver rod as a cathode and Pt electrode as anode.Assume that M^(2+) does not further oxidise and can not form complex with NH_3 Assume no hydrolysis of any ion. E_(Cu^(2+)//Cu)^(0)=0.35 V, E_(M^(2+)//M)^(0)=-0.10 V, E_(Zn^(2+)//Zn)^(0)=-0.76 V, E_(H_(2)O // H_2)^(0)=-0.828 V, E_(Ag^(+)//Ag)^(0)=0.80 V, (2.303RT)/F=0.06 What will be the volume of gases formed at anode at STP by electrolysis of above solution after passing 20 amp current for 28950 sec. (Assume current efficiency to be 100% and one mole of gas occupies 22.4 L volume at STP).
Answer» `44.8 L Br_2` `22.4 L Br_2` `22.4 L Cl_2` `44.8 L Cl_2` Solution :TOTAL charge =`(20xx28950)/96500 =6F` MOLE of `Br_2` formed =2 Mole of `Cl_2` formed =1

Discussion

25422.	The process of using an electric current to bring about chemical change is called electrolysis.Electrolysis is a processes of oxidation and reduction at the respective electrodes due to external current passed in the electrolyte. The product obtained during electrolysis depends on following factors. The nature of the electrolyte The concentration of electrolyte The nature of the electrode. Consider the electrolysis of following cell containing aq. solution of CuSO_4,ZnCl_2 and MBr_2 by using pure silver rod as a cathode and Pt electrode as anode.Assume that M^(2+) does not further oxidise and can not form complex with NH_3 Assume no hydrolysis of any ion. E_(Cu^(2+)//Cu)^(0)=0.35 V, E_(M^(2+)//M)^(0)=-0.10 V, E_(Zn^(2+)//Zn)^(0)=-0.76 V, E_(H_(2)O // H_2)^(0)=-0.828 V, E_(Ag^(+)//Ag)^(0)=0.80 V, (2.303RT)/F=0.06 After passing 20 amp current from battery for 28950 sec.the remaining conc. of ions in solution given in passage would be: (Assume current efficiency to be 100%)
Answer» `[CU^(2+)]=0.5M, [M^(2+)]=0.5M, [Zn^(2+)]=0.1M` `[Cu^(2+)]~~0M, [M^(2+)]=0.5M, [Zn^(2+)]=0.5M` `[Cu^(2+)]=0.5M, [M^(2+)]=0.5M, [Zn^(2+)]=0.5M` `[Cu^(2+)]~~0M, [M^(2+)]=0.5M, [Zn^(2+)]=1 M` SOLUTION :Deposition ORDER `CugtMgtZn` Cu required `implies (Ixxt)/96500=w/E` `20xxt=1xx2xx2xx96500` t=19300 SEC. In 28950-19300=9650 sec `M^(2+)`, will deposit as M. mole of `Mxx2=(20xx9650)/96500` mole of M deposit =1 Initial mole of `M^(2+)=1xx2`,remain `M^(2+)` moles =2-1=1 ,`[M^(2+)]=1/2=0.5`

Discussion

25423.	The process of the removal of impurities from a crude metal is called…….
Answer» Concentration Calcination Refining Roasting Answer :C

Discussion

25424.	The process of splitting up of electrolytes into the +ve and -ve ions are called______.
Answer» SOLUTION :IONISATION or DISSOCIATION

Discussion

25425.	The process of sorption of gases on metal surface is called ........
Answer» DESORPTION DISSOLUTION OCCLUSION Condensation SOLUTION :Occlusion

Discussion

25426.	The process of separation of racemic mixture into d- and l-enantiomers is called:
Answer» Revolution Resolution Hydration Dehydration Answer :B

Discussion

25427.	The process of separation of racemic mixture into d andl enantiomers is called :
Answer» Dchydration Resolution Racemisation Condensation Answer :B

Discussion

25428.	The process of separation of emulsion into two separate layers is called______.
Answer» Emulsification Deemulsification Coagulation Flocculation Answer :B

Discussion

25429.	The process of separating the crystalloids from collodis using an animal membrane is called………..
Answer» SOLUTION :DIALYSIS

Discussion

25430.	The process of separation of colloids by passing through semi-permeable membrane is called:
Answer» FILTRATION Electrophoresis Dialysis Ultra-filtration ANSWER :C

Discussion

25431.	The process of separating a crystalloid, from a colloid by filtration, is called
Answer» EMULSIFICATION Dialysis Coagulation Peptization Answer :B

Discussion

25432.	The process of respiration in absence of oxygen is called :
Answer» Metabolic Aerobic Anaerobic Glycolysis Answer :C

Discussion

25433.	The process of removing of lighter ganse particles by washing in a current of water is called
Answer» LEVIGATION (or) GRAVITY separation Liquiation Leaching Cupellation Answer :A

Discussion

25434.	The process of removing ions from a sol by diffusion through a permeable membrane is called
Answer» ULTRA filtration Dialysis electrophoresis Cataphoresis Answer :B

Discussion

25435.	The process of removing dissolved impurities from a colloidal system, by means of diffusion through suitable membrane under the influence of an electric field is called
Answer» ELECTRO osmosis Electrophoresis Electrodialysis Peptisation Answer :C

Discussion

25436.	The process of removing dissolved impurities from a colloidal system by means of diffusion through a suitable membrane under the influence of an electric field is
Answer» Electro-osmosis Electro-dialysis Electrophoresis Peptization Answer :B

Discussion

25437.	The process of removing a adsorbed substance from the surface is called .................
Answer» SOLUTION :DESORPTION

Discussion

25438.	The process of removal of impurities form a crude metal is called :
Answer» REFINING ROASTING CALCINATIONS Concentration Answer :A

Discussion

25439.	The process of removal of gangue particles from ores is known as :
Answer» Concentration Refining Smelting None of these Answer :A

Discussion

25440.	The process of protecting iron by coating with zinc is called
Answer» CORROSION Galvanisation Rusting SMELTING ANSWER :B

Discussion

25441.	The process of ore dressing is carried out to
Answer» Remove the silicenous mineral Add flux to the mineral Convert the ORE to oxide Remove the POISONOUS impurities Solution :REMOVAL of silicious matter from ores is known as DRESSING ore CONCENTRAITON of are

Discussion

25442.	The process of osmosis was discovered by:
Answer» Pfeffer Traube Berkeley Nollet Answer :D

Discussion

25443.	The process of manufacture of absolute alcohol from rectifiedspirit is
Answer» FRACTIONAL DISTILLATION STEAM distillation Aeotropic distillation Vacuum distillation Answer :C

Discussion

25444.	The process of leaching alumina, using sodium carbonate is called-
Answer» BAYER's PROCESS Decomposition Cyanide process HALL's process ANSWER :D

Discussion

25445.	Theprocess ofisolationof metalsbydissolvingtheoreinasuitablechemicalreagentfollowedbyprecipitationofthe metal bya metalby amoreelectropositivemetaliscalled
Answer» ELECTROMETALLURGY Hydrometallurgy ELECTRO - REFINING Zonerefining. Answer :B

Discussion

25446.	The process of heating the ore strongly in excess of air so that the volatile impurities are removed and the ore is changed to oxide is known as :
Answer» Calcination Roasting Forth FLOATATION LEACHING ANSWER :B

Discussion

25447.	The process of heating rubber with sulphur is called ………………….
Answer» VULCANIZATION galvanization sulphonation besemerization SOLUTION :vulcanization

Discussion

25448.	The process of hardening of leather is called___.
Answer» COAGULATION tanning centrifuging stabilization Answer :B

Discussion

25449.	The process of heating of copper pyrites to remove sulphur is called
Answer» FROTH flotation roasting calcination smelling Answer :B

Discussion

25450.	The process of gold reduced to its elemental state is called ……..
Answer» SOLUTION :CEMENTATION REDOX

Discussion

Explore topic-wise InterviewSolutions in .

The process which does not evolve CO_2 in air is :

The processusedin therefiningof aluminimumand zincmetalsare repsectively

The process used in obtaining metallic silver from argentite is :

The process used in converting hydrated Alumina into anhydrous alumina is called

The process used in conversion of triolein to tristerin is

The process used for purification of bauxite ore containing high silica content as impurity is :

The process that does not yield an amine is

The process used for purification of bauxite ore containing iron oxide impurity is known as :

The process requiring the adsorption of :

The process requiring the absorption of energy is:

The process requiring absorption of energy is:

The process/processes by which lighter earthy particles are freed from the heavier particles using water is/are

The process photosynthesis cannot occur in the absence of :

The processs of zone refining is used in the purifications of

The process of zinc-plating on iron sheet is known as

The process of which alum purifies turbid water is -

The process of vulcanization was introduced by ...............

What is natural rubber ? What is vulcanisation of rubber ? How is it carried ?

The process of the removal of impurities from a crude metal is called…….

The process of splitting up of electrolytes into the +ve and -ve ions are called______.

The process of sorption of gases on metal surface is called ........

The process of separation of racemic mixture into d- and l-enantiomers is called:

The process of separation of racemic mixture into d andl enantiomers is called :

The process of separation of emulsion into two separate layers is called______.

The process of separating the crystalloids from collodis using an animal membrane is called………..

The process of separation of colloids by passing through semi-permeable membrane is called:

The process of separating a crystalloid, from a colloid by filtration, is called

The process of respiration in absence of oxygen is called :

The process of removing of lighter ganse particles by washing in a current of water is called

The process of removing ions from a sol by diffusion through a permeable membrane is called

The process of removing dissolved impurities from a colloidal system, by means of diffusion through suitable membrane under the influence of an electric field is called

The process of removing dissolved impurities from a colloidal system by means of diffusion through a suitable membrane under the influence of an electric field is

The process of removing a adsorbed substance from the surface is called .................

The process of removal of impurities form a crude metal is called :

The process of removal of gangue particles from ores is known as :

The process of protecting iron by coating with zinc is called

The process of ore dressing is carried out to

The process of osmosis was discovered by:

The process of manufacture of absolute alcohol from rectifiedspirit is

The process of leaching alumina, using sodium carbonate is called-

Theprocess ofisolationof metalsbydissolvingtheoreinasuitablechemicalreagentfollowedbyprecipitationofthe metal bya metalby amoreelectropositivemetaliscalled

The process of heating the ore strongly in excess of air so that the volatile impurities are removed and the ore is changed to oxide is known as :

The process of heating rubber with sulphur is called ………………….

The process of hardening of leather is called___.

The process of heating of copper pyrites to remove sulphur is called

The process of gold reduced to its elemental state is called ……..