94420 + Interview Questions in Chemistry in Class 12

1.	Streptomycin, a well known antibiotic, is a derivative of
Answer» Peptides Carbohydrates Purines TERPENES ANSWER :B

Discussion

2.	Strength of hydrogen bond is intermediate between
Answer» VANDER WAAL and COVALENT Ionic and covalent Ionic and metallic Metallic and covalent ANSWER :A

Discussion

3.	Strength of halogen acids, HF, HCl, HBr and HI varies as :
Answer» `HF GT HCL gt HBr gt HI` `HF gt HBr gt HI HCl` `HBr gt HI gt HCl gt HF` `HI gt HBr gt HCl gt HF.` ANSWER :D

Discussion

4.	Strength of H-bond and boiling point order is opposite for :-
Answer» `HF, H_(2)O, H_(2)O_(2)` `HF , H_(2)O, NH_(3)` HF, HCl, HBr `H_(2)O, H_(2)S, NH_(3)` Solution :H-bond STRENGTH `-HF GT H_(2)O gt H_(2)O_(2)` BOILING point `-HF lt H_(2)O lt H_(2)O_(2)`

Discussion

5.	Strength of acideity is in order
Answer» II GT I gt III gt IV III gt IV gt I gt II Igt IV gt III gt II IV gt III gt I gt II ANSWER :B

Discussion

6.	Strength of 2N H2O2 solution is approximately
Answer» 10 volume 11.2 volume 22.4 volume 1.12 volume Answer :B

Discussion

7.	Straight chain polymer is formed by hydrolysis of [x] which is tetrasubstituted chloromethylsilane then followed by condensation polymerization. Atomicity of [x] is:
Answer» SOLUTION :N//A

Discussion

8.	Straight line slope of Freundlich isotherm curve indicates the value of .........
Answer» `N` `(1)/(n)` `n^(2)` `(1)/(n^(2))` SOLUTION :`(1)/(n)`

Discussion

9.	Streling silver:
Answer» Is an alloy of AG + CU Contains `80% Ag + 20% Cu` Is used in jewellery All Answer :D

Discussion

10.	Strach is the mostimportant dietary source for human beings .
Answer» ANSWER :1

Discussion

11.	Stoichiometric defects in an ionic solid is also called ……………………or …………………..defect.
Answer» SOLUTION :INTRINSIC or THERMODYNAMIC

Discussion

12.	Stoichiometric defects are of two types such as vacancy defects and interstitial defects. Which stoichiometric defect causes the decrease in density of solid?
Answer» ANSWER :SCHOTTKY DEFECT

Discussion

13.	Stoichiometric defects are of two types such as vacancy defects and interstitial defects. Which defect is basically a vacancy defect in ionic solids?
Answer» ANSWER :SCHOTTKY DEFECT

Discussion

14.	Stinges of bees, red ant and wasps contain :
Answer» FORMALIN FORMIC ACID ACETIC acid Formaldehyde Answer :B

Discussion

15.	Stibene (PhCH=CHPh). Can exist in two idastereomeric forms (X) and (Y) and (X) is found to be more soluble in water than (Y). Predict which of the following statement is correct?
Answer» X is trans isomer STABILITY of `x GT` Stability of Y Melting point of `X gt` Melting point of Y BOILING point of `X gt` boiling point of Y Answer :D

Discussion

16.	Stibene (PhCH=CHPh) can exist in two diastereomeric forms (X) and (Y), and (X) is found to be more soluble in water than (Y). Predict which of the following statement is correct.
Answer» X is TRANS isomer STABILITY of X gt stability of Y MELTING point of X LT melting point of Y Boiling point of X lt boiling point of Y Solution :

Discussion

17.	Steroids are derived from
Answer» HIGHLY BRANCHED glycerides long CHAIN FATTY acids cyclopenta perhydrophenanthrene galacto cerebrosides Answer :C

Discussion

18.	Steroisomes have different
Answer» MOLECULAR formula structural formula configuration conformation Answer :C

Discussion

19.	Sterol, the basic unit of vitamin D, consists of 4 rings they are
Answer» Three 6-carbon RINGS ONE FIVE carbon ring Three 5-carbon rings one SIX carbon ring Four 6-carbon rings only Four 5-carbon rings only Answer :A

Discussion

20.	Sterility is caused because of ………………..
Answer» VITAMIN E DEFICIENCY Vitamin K deficiency Vitamin A deficiency Vitamin D deficiency SOLUTION :Vitamin E deficiency

Discussion

21.	Steric factor, P, refers to the orientation of molecules which collide and contributes to __________ collision.
Answer» SOLUTION :EFFECTIVE

Discussion

22.	Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are confomational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C-H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conflormation that is almost completely free of strain. the most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Select the correct sequence of decreasing order of stability?
Answer» GAUCHE `GT` staggered `gt` partially eclipsed `gt` FULLY eclipsed staggered `gt` gauche `gt` partially eclipsed `gt` fully eclipsed fully eclipsed `gt` partially eclipsed `gt` gauche `gt` staggered partially eclipsed `gt` fully eclipsed `gt` staggered `gt` gauche. Answer :B

Discussion

23.	Stericeffectof methyl groupreduces basic characterof .
Answer» `3^(0)`AMINES `1^(0)` amine `2^(0)` amine none of these ANSWER :A

Discussion

24.	Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are confomational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C-H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conflormation that is almost completely free of strain. the most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. The energy barrier between eclipsed and staggered forms is:
Answer» 44 kJ/mol 6.7kj/mol 12.55kJ/mol 29.7kJ/mol Answer :C

Discussion

25.	Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are confomational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C-H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conflormation that is almost completely free of strain. the most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Which among the following conformations of cyclohexane is the most stable form?
Answer» CHAIR FORM Half chair form Twist BOAT form Boat form. ANSWER :A

Discussion

26.	Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are confomational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C-H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conflormation that is almost completely free of strain. the most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle is staggered and eclipsed conformation are:
Answer» `60^(@)` and `0^(@)` `0^(@)` and `60^(@)` `60^(@)` and `120^(@)` `120^(@)` , and `60^(@)` ANSWER :A

Discussion

27.	Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are confomational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C-H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conflormation that is almost completely free of strain. the most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Which of the following molecules has the highest deviation from tetrahedral bond angle?
Answer» Cyclopropane Cyclobutane Cyclopentane Cyclohexane Answer :A

Discussion

28.	Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are confomational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C-H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conflormation that is almost completely free of strain. the most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle between two methyl groups of n-butane in the gauche and anti forms are:
Answer» `60^(@),0^(@)` `60^(@),180^(@)` `0^(@),60^(@)` `180^(@),60^(@)` ANSWER :B

Discussion

29.	Stereoisomers may be of different types. Stereosiomers that are radialy interconvertible by rotation around a sigma-bond are known as_______isomers
Answer» geometrical optical cis-trans CONFORMATIONAL Solution :Conformational ISOMERS DIFFER by ROTATION about a `C-C` BOND.

Discussion

30.	Stereoisomers have different :
Answer» MOLECULAR FORMULA structural formula configuration conformation. ANSWER :C

Discussion

31.	Stereoisomers have different:
Answer» MOLECULAR formula Structural formula Configuration Molecular mass Answer :C

Discussion

32.	Stereoisomerism occurs when the bond connectivity is same but the spatial arrangement of more than one type is possible. Stereoisomerism finds vast use in orgaic chemistry, mainly biochemistry as all the biomolecules, are generally stereospecific in their actions. Stereoisomerism in limited not only to organic compounds but also to anorganic compounds, mainly in co-ordination complexes. Stereoisomers include cis and trans isomers, chiral isomers, compound wilth different conformation of chelate rings and other isomers that differ only in the geometry of attachement of the metal ion. Select the correct option for tertraamminedichlorocobalt (III) ion, the trans isomer
Answer» does not have any SYMMETRY has PLANE of symmetry trans form is meso form trans form exists as a PAIR of ennantiomer Solution : It is has AXIS of symmetyr and plane of symmetry.

Discussion

33.	Stereoisomers (Geometrical or opticals ) which are neither superimposable nor mirror image to each other are called:
Answer» Enantiomers Mesomers Tautomers Diastereomers Answer :D

Discussion

34.	Stereoisomerism arises on account of different positions and arrangement of lignads in space around the metal ion . These are classified into two types : (i) Geometrical isomerism is exhibited by octahedral and square planar complexes . (ii) Optical isomerism is shown when mirror images are non superimposable. Both geometrical and optical isomerism are shown by
Answer» `[Co(en)_(2)Cl_(2)]^(+)` `[Co(NH_(3))_(5)CL]^(2+)` `[Co(NH_(3))_(4)Cl_(2)]` `[CR(OX)_(3)]^(3-)` Solution :The compound SHOWS both geometrical & optical ISOMERISM.

Discussion

35.	Stereoisomerism arises on account of different positions and arrangement of lignads in space around the metal ion . These are classified into two types : (i) Geometrical isomerism is exhibited by octahedral and square planar complexes . (ii) Optical isomerism is shown when mirror images are non superimposable. The total number of possible isomers for the complex compound [Cu(NH_(3))_(4)][PtCl_(4)] are :
Answer» 3 6 5 4 Solution :d) it is the CORRECT ANSWER.

Discussion

36.	Stereoisomerism arises on account of different positions and arrangement of lignads in space around the metal ion . These are classified into two types : (i) Geometrical isomerism is exhibited by octahedral and square planar complexes . (ii) Optical isomerism is shown when mirror images are non superimposable. Choose the correct answer : 11. Which of the following will not show geometrical isomerism ?
Answer» `[Cr(NH_(3))_(4)Cl_(2)]Cl` `[CO(OH_(2))_(4)Cl_(2)]Cl` `[Co(NH_(3))_(5)NO_(2)]Cl_(2)` `[Pt(NH_(3))_(2).Cl_(2)]` Solution :c) it is the CORRECT answer.

Discussion

37.	Stereoisomerism arises on account of different positions and arrangement of lignads in space around the metal ion . These are classified into two types : (i) Geometrical isomerism is exhibited by octahedral and square planar complexes . (ii) Optical isomerism is shown when mirror images are non superimposable. The compound(s) that exhibi(s) geometrical isomerism is(are) :
Answer» `[Pt(en)Cl_(2)]` `[Co(OH_(2))_(4)Cl_(2)]CL` `[Pt(en)_(2)Cl_(2)]Cl_(2)` `[Pt(NH_(3))_(2).Cl_(2)]` Solution :Both SHOW geometrical isomerism.

Discussion

38.	Stephen's reduction convert
Answer» ACYL CHLORIDE to ALDEHYDE cyanide to aldehyde cyanide to carboxylic acid cyanide to ketones Answer :B

Discussion

39.	Stephen's reaction is reduction of :
Answer» ALKYL cyanide with` LiAIH_4` Alkyl cyanide with `SnCl_2` and `HCL` Alkyl isocyanide with `Na` and alcohol ACYL halide in the presence if `PD`with `BaSO_4` Answer :B

Discussion

40.	Stephen's reaction is used to prepare aldehydes from:
Answer» Alcohol Alkyl cyanides Alkenes Acid chlorides Answer :B

Discussion

41.	Step C (refining) involved in purification of Pb metal:
Answer» ANSWER :d

Discussion

42.	Steels are generally prepared by----------- method
Answer» COMPRESSED METHOD OXIDATION QUENCHING Electrylytic deposition Solution :Quenching

Discussion

43.	Steel is an alloy of _______
Answer» IRON and carbon iron and calcium copper and carbon copper and iron Answer :A

Discussion

44.	Steel that is resistant to acids is :
Answer» CARBON steel Molybdenum steel Stainless steel Nickel steel Answer :B

Discussion

45.	Steel contains carbon
Answer» 0.12% to 0.25% 2.5% to 4.5% 1 to 2% 0.5 to 1.5% SOLUTION :0.5 to 1.5%

Discussion

46.	Steel containing nickel is used in ..........
Answer» AGRICULTURAL tools MACHINES for grindings In PREPARATION of ANCHORS Pendulums ANSWER :D

Discussion

47.	Steel contains :
Answer» `2.5 - 4.5 %` C `0.5 - 1.5%` C `0.12 - 0.25% C` `1 - 2% C` ANSWER :B

Discussion

48.	Steel becomes soft and pliable by
Answer» Annealing Nitriding Tempering Case hardening Solution :Annealing is a PROCESS of heating STEEL to redness followed by SLOW COOLING.

Discussion

49.	Steam is passed over hot coke to give water gas. Which substance set as reductant?
Answer» Solution :COKE removes OXYGEN from water to give hydrogen. `H_(2)O + C rarr H_(2) + CO` SUBSTANCE that removes oxygen is reductant. Here, coke is reductant.

Discussion

50.	Steam distillation is applied to those organic compound which are steam volatile and :
Answer» SOLUBLE in WATER insoluble in water sparingly soluble in water insoluble in all solvents SOLUTION :N//A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Streptomycin, a well known antibiotic, is a derivative of

Strength of hydrogen bond is intermediate between

Strength of halogen acids, HF, HCl, HBr and HI varies as :

Strength of H-bond and boiling point order is opposite for :-

Strength of acideity is in order

Strength of 2N H2O2 solution is approximately

Straight chain polymer is formed by hydrolysis of [x] which is tetrasubstituted chloromethylsilane then followed by condensation polymerization. Atomicity of [x] is:

Straight line slope of Freundlich isotherm curve indicates the value of .........

Streling silver:

Strach is the mostimportant dietary source for human beings .

Stoichiometric defects in an ionic solid is also called ……………………or …………………..defect.

Stoichiometric defects are of two types such as vacancy defects and interstitial defects. Which stoichiometric defect causes the decrease in density of solid?

Stoichiometric defects are of two types such as vacancy defects and interstitial defects. Which defect is basically a vacancy defect in ionic solids?

Stinges of bees, red ant and wasps contain :

Stibene (PhCH=CHPh). Can exist in two idastereomeric forms (X) and (Y) and (X) is found to be more soluble in water than (Y). Predict which of the following statement is correct?

Stibene (PhCH=CHPh) can exist in two diastereomeric forms (X) and (Y), and (X) is found to be more soluble in water than (Y). Predict which of the following statement is correct.

Steroids are derived from

Steroisomes have different

Sterol, the basic unit of vitamin D, consists of 4 rings they are

Sterility is caused because of ………………..

Steric factor, P, refers to the orientation of molecules which collide and contributes to __________ collision.

Stericeffectof methyl groupreduces basic characterof .

Stereoisomers may be of different types. Stereosiomers that are radialy interconvertible by rotation around a sigma-bond are known as_______isomers

Stereoisomers have different :

Stereoisomers have different:

Stereoisomers (Geometrical or opticals ) which are neither superimposable nor mirror image to each other are called:

Stephen's reduction convert

Stephen's reaction is reduction of :

Stephen's reaction is used to prepare aldehydes from:

Step C (refining) involved in purification of Pb metal:

Steels are generally prepared by----------- method

Steel is an alloy of _______

Steel that is resistant to acids is :

Steel contains carbon

Steel containing nickel is used in ..........

Steel contains :

Steel becomes soft and pliable by

Steam is passed over hot coke to give water gas. Which substance set as reductant?

Steam distillation is applied to those organic compound which are steam volatile and :