94420 + Interview Questions in Chemistry in Class 12

1.	Process to get pure metals from ores by removing unwanted material or impurity is known as....
Answer» METALLURGY ELECTROLYSIS REDUCTION PURIFICATION ANSWER :A

Discussion

2.	.............process is used in the extraction of sliver and gold from their ores.
Answer» ANSWER :Mac-Arthur-Forest CYANIDE

Discussion

3.	Process followed before reduction of carbonate ore is
Answer» CALCINATION roasting liquation polling Solution :Calcination is HEATING ore in absence of air to REMOVE moisture and volatile IMPURITIES. Carbonate ores decomposed to CORRESPONDING oxides as a result of calcination.

Discussion

4.	Process, AtoB represent:
Answer» isobaric isochoric isothermal adiabatic Answer :B

Discussion

5.	Procaine, lidocaine, cemitidine, propofol, iso flurane.
Answer» SOLUTION :CEMITIDINE. It is an antacid whereas others are ANAESTHETICS.

Discussion

6.	Problems based on Faraday's laws of electrolysis.
Answer» Solution :Determine the quantity of electricity (Q in coulomb) from the PRODUCT of electriccurrent (I in ampere) and time (t in second). (2) Electrochemical EQUIVALENT of a SUBSTANCE can be calculated from the relation, `W=ZxxQ` if amount (W) of the substance deposited at the electrode is known. (3) The amount of substance deposited at the electrode by 1 faraday of electricity = 1 gram - equivalent. If (a) W g of the substance is produced by Q coulomb of electricity, its gram - equivalent `=(W//Qxx96500)g`. (b) If 1 gram - equivalent of the substance is Eg, then Q coulomb electricity will produce `(E//96500xxQ)g` of the substance.

Discussion

7.	Probability of finding electrons is nearly equalto 90- 60%for
Answer» an ORBITAL a SUB SHELL an orbit an ATOM ANSWER :A

Discussion

8.	Principles of thermodynamics can be applied to………………..
Answer» SOLUTION :PYROMETALLURGY

Discussion

9.	Principal, magnetic and azimuthal quantum numbers are respectively related to:
Answer» SIZE, ORIENTATION, SHAPE size, shape, orientation shape, size and orientation None of these Answer :A

Discussion

10.	Primary valency is satsified by
Answer» only NEGATIVE ligands only POSITIVE ligands negative and NEUTRAL ligands positive and neutral ligands Answer :A

Discussion

11.	Primary valency denotes
Answer» coordination NUMBER number of LIGAND oxidation number effective atomic number Answer :C

Discussion

12.	Primary, secondry, tertiary nitroalkanes can be identified by the action of :
Answer» `NHO_2 + NAOH `AQ. `CHCl_3 + NaOH` aq. `CHCl_3 + KOH` alc. None Answer :A

Discussion

13.	Primary, secondry, and tertiary amines may be scparated by using :
Answer» ETHANOYL CHLORIDE DIETHYL OXALATE Thionyl chloride None Answer :B

Discussion

14.	Primary structure of proteins refer to _______ .
Answer» AMINO ACID present the shape of protein MOLECULE the peptide bond the sequence of amino acid SOLUTION :the sequence of amino acid

Discussion

15.	Primary structure of protein is due to
Answer» SEQUENCE in which `alpha`-amino acids are linked to one ANOTHER sequence in which amino ACID of one polypeptide chain are joined to other chain the folding patterns of polypeptide chains the pattern in which the polypeptide chains are arranged. Solution :The sequence in which the `alpha`-amino acids are linked to one another in a protein MOLECULE is called its PRIMARY structure.

Discussion

16.	Primary , secondary , tertiary amines can be separated by the following except :
Answer» Fractional distillation Fractional METHOD ysubg duetgtk OXALATE Hinsberg' s method using ` C_6 H-5 SOCl` Selective crtystallisation Solution :Statement is self EXPLANATORY

Discussion

17.	Primary, secondary and tertiary amines can be differentiated by using _________
Answer» thionyl CHLORIDE NITROUS ACID ethanoyl chloride hydroxylamine ANSWER :B

Discussion

18.	Primary, secondary and tertiary alcohols may be distinguished by converting them into the corresponding nitroparaffins which are then treated with
Answer» aqueous NaOH CONC. `H_(2)SO_(4)` conc. HCI `NaNO_(2)+ "dilHCL"` SOLUTION :The NITROALKANES are then treated with `HNO_(2)` i.e., `NaNO_(2) + "dilute" HCI.`

Discussion

19.	Primary,secondary and tertiary alcohols may be distinguishedby employing
Answer» HOFFMANN's test Fehling SOLUTION. test Lucas test None of the above Answer :C

Discussion

20.	Primary, secondary and tertiary amines can be separated by using
Answer» DIETHYL ether Hinsberg's reagent HOFMANN method Filterpaper Solution :Himsberg.s, Hofmann

Discussion

21.	Primary , secondary and tertiary alcohols can be distinguished hy
Answer» Baeyer's REAGENT Fehling's SOLUTION SULPHURIC acid LUCAS reagent ANSWER :D

Discussion

22.	Primary, secondary and tertiary alcohols are distinguished by
Answer» Cu/573 K Victor Meyer's test conc. HCl is presence of ANHYD. `ZnCl_(2)` `Br_(2)-H_(2)O` Answer :A::B::C

Discussion

23.	Primary , secondary and tertiary alcohols can be distinguished by employing :
Answer» OXIDATION VICTOR MEYER's test Lucas test All of these Answer :D

Discussion

24.	Primary , Secondaryand Tertiary alcohols can be distinguished by
Answer» Oxidation Victormryer's test Lucas reagent All of these Answer :D

Discussion

25.	Primary, secondary and teritary amines can be distinguished using hinsberg's reagent. What is Hinsberg's reagent?
Answer» Solution :Benzene sulphonyl chloride `(C_6H_5-SO_2-Cl)` is KNOWN as Hinsberg REAGENT.

Discussion

26.	Primary (or) Secondary (or) Tertiary alcohols on oxidation finally give
Answer» ESTERS KETONES ETHERS Carboxylic acids ANSWER :D

Discussion

27.	Primary, secondaryamineforms insolublenitrosoamine with
Answer» `HNO_(3)` `HNO_(2)` dil.HCl dil.`H_(2)SO_(4)` ANSWER :B

Discussion

28.	Primary, seconary and tertiary alcohols can be distinguished by_____test.
Answer» SOLUTION :LUCAS or Victor-Meyer's TEST.

Discussion

29.	Primarynitrocompounds react withnitrousacidto fromnitrolicacidwhichdissolveinNaOH togive.
Answer» YELLOW SOLUTION red solution bluesolution colourlesssolution Answer :B

Discussion

30.	Primary nitroalkanes on hydrolysis gives:
Answer» RCOOH + `NH_2OH` RCOOH `NH_2OH` RCOR Answer :A

Discussion

31.	Primarynitroalkanes are obtainedin goodyieldby oxidisingaldoximeswith thehelpof
Answer» trifluoroperoxyaceticacid ACIDIFIEDPOTASSIUM PERMANGANATE concentratednitricacid potassiumdichromateand dilutesulphuricacid SOLUTION :INFORMATION

Discussion

32.	Primary and secondary valencies of platinum in the complex, [Pt(en)_(2)Cl_(2)] are
Answer» 4,6 2,6 4,4 6,4 Answer :B

Discussion

33.	Primary nitroalkanes are obtained in good yield by oxidising aldoximes with the help of
Answer» trifluoroperoxy acetic acid acidified potassium permanganate concentrated nitric acid potassium dichromate and dilute SULPHURIC acid Solution :Primary nitroalkanes are obtained in good yield by oxidising aldoximes with the help of trifluoroperoxy acetic acid. `underset("ALDOXIME")(R CH = NOH) underset(CF_(3)COOOH)overset([O])RARR RCH = overset(O^(-))overset(\|)(N^(+))-OH hArr underset((1^(@) "nitroalkane"))(R CH_(2)NO_(2))`

Discussion

34.	Primary nitroalkanes are obtained in good by oxidising aldoximes with the help of
Answer» trifluoroperoxyacetic ACID acidified potassium permanganate concentrated nitric acid Potassium dichromate and DILUTE sulphuric acid Solution :PRIMARY nitro ALKANES are obtained in good YIELD by oxidizing aldoximes with the help of Trifluoroperoxyacetic acid.

Discussion

35.	Primary and secondary valences in coordination compounds are respectively
Answer» both ionisable. both non-ionisable. both non-ionisable. ionisable, non-ionisable. Answer :D

Discussion

36.	Primary and secondary nitroalkanescontaining alpha-Hatom show property of
Answer» CHAIN isomerism tautomerism optical isomerism geometrical isomerism Answer :A::B

Discussion

37.	Primary and secondary structures of nucleic acid reveals
Answer» Nucleotide sequence & SINGLE or DOUBLE helix structure Amino ACID sequence & 3D-folding Amino acid sequence & SHAPE of protein Single/double helix structure and Nucleotide sequence. Answer :D

Discussion

38.	Primary and secondary nitroalkanes containing alpha-H atom show property of……………..
Answer» CHAIN isomerism TAUTOMERISM OPTICAL isomerism Geometrical isomerism Answer :B

Discussion

39.	Primary and secondary nitroalkanes containing alpha-H atom show property of -
Answer» Chain isomerism Tautomerism Optical isomerism Geometrical isomerism Solution :Tautomerism is the ABILITY of certain organic compounds to REACT in ISOMERIC structure that DIFFER from each other in he position of a HYDROGEN atom and double bond since, primary and secondary nitrolkanes differ from each other in the position of `alpha` - hydrogen atom, they show property of tautomerism.

Discussion

40.	Primary and secondary amines can be distinguished by the action of:
Answer» `CS_(2)//HgCl_(2)` `NaNO_(2)//HCl` `CHCl_(2)//KOH` NaOH Solution :NaOH cannot distinguish AMINES

Discussion

41.	Name the test with which primary, secondary and tertiary amines can be distinguished.
Answer» `Br_2//KOH` `HCLO` `HNO_2` `NH_3` ANSWER :C

Discussion

42.	Primary and secondary amines can be distinguished by
Answer» SCHIFF's reagent Carbylamine reaction Hofmann's bromamide reaction Biuret reaction Answer :2

Discussion

43.	Primary and secondary amide exist as dimer in solid and pure liquid state.
Answer» ANSWER :A::B::C::D

Discussion

44.	Primary and secondary amines are distinguished by :
Answer» `Br_2//KOH` `HClO` `NHO_2` `NH_3` Solution :` HNO_2` is USED to distinguish between ` 1^@, 2^@`, and ` 3^@` AMINES .

Discussion

45.	Primary and secondary alcohols on action of reduced copper give
Answer» ALDEHYDES and KETONES respectively ketones and aldehydes respectively only aldehydes only ketones Answer :A

Discussion

46.	Primary and secondary alcohols on action of reduced copper gives
Answer» ALDEHDES and KETONES resectively Ketones and ALDEHYDES respectively Only aldehydes Only ketones Answer :A

Discussion

47.	Primary and secondary alcohols on heating with copper give :
Answer» ALDEHDES and KETONES resectively Ketones and ALDEHYDES respectively Only aldehydes Only ketones Answer :A

Discussion

48.	Primary and secondary alcohols on action is reduced copper give
Answer» ALDEHYDES and Ketones respectively Ketones and aldehydes respectively Only aldehydes Only ketones Solution :`underset(1^(@)) "ALCOHOL")(R-CH_(2)OH) OVERSET(Cu)to CHO+H_(2)` `underset(2^(@) "Alcohol")(R-underset(OH)underset(\|)CH-Roverset(Cu) to R-underset(O)underset(\|\|)C-R+H_(2)`

Discussion

49.	Primary and secondary alcohols are dehydrogenated by copper at 573 K to aldehydes and ketones respectively. In contrast tertiary alcohols are dehydrated to alkenes by heating with copper at 573 K. Similarly, primary alcohols are easily oxidised to form first an aldehyde and then a carboxylic acid while secondary alcohols are oxidised to ketones which are further oxidised to form a mixture of acids. Tertiary alcohols are oxidised with difficulty and with strong oxidising agents in acidic medium. They form first ketones and then acids. In the case of alcohols containing carbon-carbon double bond, some oxidising agents oxidise both double bond and OH group while other reagents donot affect C-Chond. The product of the reaction : CH_(3)- underset(CH_(3)) underset(\|)(CH)-CH_(2)OH overset(PC C) underset("Oxidation")to is
Answer» 2-Methylpropanal 2-Methylpropanoic BUTANOIC acid Butan-2-one Solution :`CH_(3)underset(CH_(3))underset(\|)(CH)CH_(2)OHunderset("Oxudation")overset(PC C)toCH_(3)underset(CH_(3))underset(\|)(CH)CHO`

Discussion

50.	Primary and secondary alcohols are dehydrogenated by copper at 573 K to aldehydes and ketones respectively. In contrast tertiary alcohols are dehydrated to alkenes by heating with copper at 573 K. Similarly, primary alcohols are easily oxidised to form first an aldehyde and then a carboxylic acid while secondary alcohols are oxidised to ketones which are further oxidised to form a mixture of acids. Tertiary alcohols are oxidised with difficulty and with strong oxidising agents in acidic medium. They form first ketones and then acids. In the case of alcohols containing carbon-carbon double bond, some oxidising agents oxidise both double bond and OH group while other reagents donot affect C-Chond. Butan-2-ol on heating with Cu at 573 K gives
Answer» butanal butan-2-one PROPANONE but-2-ene Solution :`CH_(3)CH_(2)UNDERSET("Butan-2-ol")underset(OH)underset(\|)(CHCH_(3))overset(Cu,573)toCH_(3)CH_(2)underset("Butan-2-one")underset(O)underset(\|\|)(C CH_(3))`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Process to get pure metals from ores by removing unwanted material or impurity is known as....

.............process is used in the extraction of sliver and gold from their ores.

Process followed before reduction of carbonate ore is

Process, AtoB represent:

Procaine, lidocaine, cemitidine, propofol, iso flurane.

Problems based on Faraday's laws of electrolysis.

Probability of finding electrons is nearly equalto 90- 60%for

Principles of thermodynamics can be applied to………………..

Principal, magnetic and azimuthal quantum numbers are respectively related to:

Primary valency is satsified by

Primary valency denotes

Primary, secondry, tertiary nitroalkanes can be identified by the action of :

Primary, secondry, and tertiary amines may be scparated by using :

Primary structure of proteins refer to _______ .

Primary structure of protein is due to

Primary , secondary , tertiary amines can be separated by the following except :

Primary, secondary and tertiary amines can be differentiated by using _________

Primary, secondary and tertiary alcohols may be distinguished by converting them into the corresponding nitroparaffins which are then treated with

Primary,secondary and tertiary alcohols may be distinguishedby employing

Primary, secondary and tertiary amines can be separated by using

Primary , secondary and tertiary alcohols can be distinguished hy

Primary, secondary and tertiary alcohols are distinguished by

Primary , secondary and tertiary alcohols can be distinguished by employing :

Primary , Secondaryand Tertiary alcohols can be distinguished by

Primary, secondary and teritary amines can be distinguished using hinsberg's reagent. What is Hinsberg's reagent?

Primary (or) Secondary (or) Tertiary alcohols on oxidation finally give

Primary, secondaryamineforms insolublenitrosoamine with

Primary, seconary and tertiary alcohols can be distinguished by_____test.

Primarynitrocompounds react withnitrousacidto fromnitrolicacidwhichdissolveinNaOH togive.

Primary nitroalkanes on hydrolysis gives:

Primarynitroalkanes are obtainedin goodyieldby oxidisingaldoximeswith thehelpof

Primary and secondary valencies of platinum in the complex, [Pt(en)_(2)Cl_(2)] are

Primary nitroalkanes are obtained in good yield by oxidising aldoximes with the help of

Primary nitroalkanes are obtained in good by oxidising aldoximes with the help of

Primary and secondary valences in coordination compounds are respectively

Primary and secondary nitroalkanescontaining alpha-Hatom show property of

Primary and secondary structures of nucleic acid reveals

Primary and secondary nitroalkanes containing alpha-H atom show property of……………..

Primary and secondary nitroalkanes containing alpha-H atom show property of -

Primary and secondary amines can be distinguished by the action of:

Name the test with which primary, secondary and tertiary amines can be distinguished.

Primary and secondary amines can be distinguished by

Primary and secondary amide exist as dimer in solid and pure liquid state.

Primary and secondary amines are distinguished by :

Primary and secondary alcohols on action of reduced copper give

Primary and secondary alcohols on action of reduced copper gives

Primary and secondary alcohols on heating with copper give :

Primary and secondary alcohols on action is reduced copper give