94420 + Interview Questions in Chemistry in Class 12

1.	Name the members of the lanthanoid series which exhibit (+4) oxidation states and those which exhibit (+2) oxidation states. Try to correlate this type of behaviour with the electronic configurations of these elements.
Answer» Solution :Elements Ce(Z=58), Pr(Z=59), Tb(Z=65) and DY(Z=66) SHOW (+4) oxidation state. While elements Nd(Z=60), Pm(Z=61), Sm(Z=62), Eu(Z=63), Tm (Z=69) and Yb(Z=70) show (+2) oxidation STATES. (+2) and (+4) oxidation states occur when the configuration `f^(0), f^(7) and f^(14)` are attained by the elements. (i) `Ce^(4+) (f^(0)) rArr (+4)` Oxidation state. (ii) `Eu^(2+) (f^(7) rArr (+2)` Oxidation state. (iii) `Yb^(2+) (f^(14)) rArr (+2)` Oxidation state.

Discussion

2.	Name the members of the lanthanoid series which exhibit +2 oxidation states. Try to correlate this type of behaviour with the electronic configuration of these elements.
Answer» Solution :`+4` oxidation state is given by : `""_(58)Ce,""_(59)Pr, ""_(60)Nd, ""_(65)Tb, ""_(66)Dy` `+2` oxidation state is given by : `""_(60)Nd,""_(62)SM,""_(63)Eu,""_(69)Tm,""_(70)Yb` +2 oxidation state is EXHIBITED when the lanthanoid has the configuration `5d^(0)6s^(2)` so that 2 electrons are easily lost. +4 oxidation state is exhibited when the configuration left is close to `4f^(0)("e.g., "4f^(0),4f^(1),4f^(2))` or close to `4f^(1)("e.g., "4f^(7)" or "4f^(8))`.

Discussion

3.	Name the members of the lanthanoid series which exhibit +4 oxidation states and those which exhibit +2 oxidation states. Try to correlate this type of behaviour with the electronic configuration of these elements.
Answer» Solution :` +4 = ""_(58)Ce, ""_(59)Pr, ""_(60)ND, ""_(65)Tb, ""_(66)Dy` `+2 = ""_(60)Nd, ""_(62)Sm, ""_(63)Eu, ""_(69)Tm, ""_(70)Yb` +2 OXIDATION state is exhibited when the LANTHANOID has the configuration `5d^06s^2` so that 2 electrons are easily lost. +4 oxidationstate is exhibited when the configuration left is CLOSE to `4f^(0) (e.g, 4f^0 , 4f^1, 4f^2) ` or close to `4f^7 (e.g. 4f^7 or 4f^8)`

Discussion

4.	Name the medicine which can be used both as an analgesic as well as an antipyretic.
Answer» SOLUTION :ASPIRIN.

Discussion

5.	Name the major product obtained when tertiary butyl bromide is heated with alcoholic KOH solution.
Answer» SOLUTION :2 METHYL PROP - 2 - AL

Discussion

6.	Name the major product obtained when an alkyl halide is treated with silver cyanide.
Answer» SOLUTION : ALKYL CARBYLAMINE.

Discussion

7.	Name the major product formed when sodium phenoxide is heated with CO_(2) at 400K under 4-7 atm pressure. What is the name of the reaction?
Answer» SOLUTION :2-Hydroxybenzoic ACID (SALICYLIC acid). KOLBE's REACTION.

Discussion

8.	Name the major product formed when the vapours of following alcohols are passed over hot cooper at 573K.
Answer» SOLUTION :

Discussion

9.	Name the major product formed when the vapours of following alcohols are passed over hot cooper at 573K. CH_(3)-CH(OH)CH_(3)
Answer» SOLUTION :`UNDERSET("PROPANONE")(CH_(3)-underset(O)underset(\|\|)(O)-CH_(3))`

Discussion

10.	Name the major product formed when nitrous acid is treated with i) methylamine ii) aniline at low temperature
Answer» Solution :(i)Methyl ALCOHOL (II) BENZENE DIAZONIUM SALT.

Discussion

11.	Name the major organic product formed in the following conversion.(i) When nitrous acid is treated with methyl lamine. (ii) Benzene diazonium chloride is treated with Kl
Answer» Solution :(i) AlcoholC`H_3- NH_2 + HNO_2 overset(NaNO_2 + HCl) (to) [CH_3N_2Cl] overset(H_2O)(to) R - OH + N_2 + HCl `(ii) IODOBENZENE`CH_5N_2Cl + KItoC_6H_5I+N_2+KCl`

Discussion

12.	Name the major organic product formed when 2-bromopentane is heated with alcoholic potassium hydroxide solution.
Answer» SOLUTION : PENT - 2 - ENE or 2 - PENTENE

Discussion

13.	Name the major product formed when nitrous acid is treated with Methylamine
Answer» SOLUTION :METHYL ALCOHOL

Discussion

14.	Name the main product formed when bromoethane is treated with sodium metal in dry ether
Answer» SOLUTION :The MAIN proewe wish-Butane `(C_(4)H_(10)).` `C_(2)H_(5)Br + 2Na + BrC_(2)H_(5)OVERSET"Dry Ether"rightarrowC_(2)H_(5)-C_(2)H_(5)+2NaBr`

Discussion

15.	Name the maindiesease causeddue tolackof viatmin and its source in eachof the following A, B_(6) and E.
Answer» SOLUTION :

Discussion

16.	Name the main constituents of dettol.
Answer» SOLUTION :CHLOROXYLENOL and `ALPHA`-terpineol.

Discussion

17.	Name the macromolecules which are chosen as drug targets.
Answer» SOLUTION :Macromolecules such as PROTEINS, NUCLEIC acids, carbohydrates and LIPIDS are called drug targets.

Discussion

18.	Name the macromolecules that are chosen as drug targets.
Answer» Solution :The MACROMOLECULES which are chosen as drug targets are carbohydrates, PROTEINS, lipids and NUCLEIC acids.

Discussion

19.	Name the linkage which prop- amino acids are joined in a linear fashion in proteins.
Answer» SOLUTION :The linkage by which `prop`- amino ACIDS are joined in a LINEAR fashion in proteins is called PEPTIDE linkage.

Discussion

20.	Name the linkage which joins two monosaccharide units through oxygen atoms.
Answer» SOLUTION :The linkage which joins TWO MONOSACCHARIDE units through oxygen ATOM is called glycosidic linkage.

Discussion

21.	Name the linkage connecting monosaccharide units in polysaccharides.
Answer» SOLUTION :In a POLYSACCHARIDE molecule , the MONOSACCHARIDE unit are LINKED through glycosidic LINKAGE .

Discussion

22.	Name the law behind the dissolution of CO_(2) gas in soft drinks under high pressure.
Answer» SOLUTION :HENRY's LAW.

Discussion

23.	Name the lanthanoid element which exhibits a +4 oxidation state besides +3 oxidation state.
Answer» SOLUTION :CERIUM SHOWS +3 as well as +4 oxidation state.

Discussion

24.	Name the law behind the dissolution of CO_2 gas In soft drinks under high pressure.
Answer» SOLUTION :Henry.s LAW

Discussion

25.	Name the isomerism shown by the following pair of coordination compounds :
Answer» SOLUTION :IONISATION ISOMERISM.

Discussion

26.	Name the isomerism exhibited by the co-ordination compounds? [Co(NH_(3))_(5)Br]SO_(4) and [Co(NH_(3))_(5)SO_(4)]Br Give ne test to distinguish between these two compounds.
Answer» SOLUTION :They EXHIBIT IONISATION ISOMERISM.

Discussion

27.	Name the ionization isomer of [Cr(H_(2)O)_(5)Br]SO_(4)
Answer» Solution :`[CR(H_(2)O)_(5)SO_(4)]BR`, i.e. pentaaquasulphatochromium (III) bromide.

Discussion

28.	Name the instrument used to measure conductance.
Answer» SOLUTION :WHEATSTONE BRIDGE

Discussion

29.	What are the biological functions of nucleic acids?
Answer» SOLUTION :(i) ENERGY carriers (ATP) (ii) Components of ENZYME COFACTORS (iii) Chemical MESSENGERS.

Discussion

30.	Name the hydrocarbon that is a liquid at STP.
Answer» ethane propane n-butane n- pentane Answer :D

Discussion

31.	Namethehormonethatcontain Iodine.
Answer» SOLUTION :THYROXINE.

Discussion

32.	Name the halogen which forms only one oxo acid and also write the formula of the oxo acid.
Answer» Solution :HALOGEN : `F_(2)` (Fluorine) and Oxo ACID : HOF (HYPOFLUOROUS acid)

Discussion

33.	Name the halogen-which forms only one oxo acid and also write the formula of the oxo acid of that halogen.
Answer» SOLUTION :FLUORINE, HOF

Discussion

34.	Name the halogen with lowest ionization energy.
Answer» SOLUTION :Halogen having the largest SIZE has the lowest ionization ENERGY, i.e., I (IODINE).

Discussion

35.	Name the halogen which does not exhibit positive oxidation state .
Answer» Solution :Fluorine being the most electronegative element does not SHOW POSITIVE oxidation STATES.

Discussion

36.	Name the halogen present in Cryolite.
Answer» SOLUTION :FLUORINE

Discussion

37.	Name the gas that is released when propanol is treated with diazomethane.
Answer» SOLUTION :NITROGEN GAS `(N_(2))`.

Discussion

38.	Name the gas that is released when ethyl amine is treated with nitrous acid .
Answer» SOLUTION :NITROGEN GAS `(N_(2))`

Discussion

39.	Name the gas that can readily decolourise acidified KMnO_(4) solution.
Answer» <P>`SO_(2)` `NO_(2)` `P_(2)O_(5)` `CO_(2)` Solution :`SO_(2)` is a strong REDUCING agent and HENCE readily decolourises `KMnO_(4)`.

Discussion

40.	Name the gas that can readily decolourise acidified KMnO_(4) solution-
Answer» <P>`CO_(2)` `SO_(2)` `NO_(2)` `P_(2)O_(5)` ANSWER :B

Discussion

41.	Name the gas other than CO_(2) which also turns lime water milky.
Answer» Solution :`SO_(2)` gas also TURNS lime WATER milky as insluble `CaSO_(3)` is PRODUCED.

Discussion

42.	Name the gas liberated when zinc reacts with dil. HNO_(3)
Answer» ANSWER :`N_2O` or NITROUS OXIDE

Discussion

43.	Name the gas liberated when concentrated HCI is heated with MnO_(2) Give the equation for the reaction. Name the reagent used to obtain bleaching powder from chlorine.
Answer» SOLUTION :CHLORINE Or `Cl_(2)` `MnO_(2)^(+)4HCL rarr MnCl_(2)+2H_(2)O+Cl_(2)` Dry SLAKED lime.

Discussion

44.	Name the gas liberated whenaqueous solution of ammonium chlorideis mixed with sodium nitrite . Give equation.
Answer» Solution :NITROGEN GAS `NH_(4)Cl+NaNO_(2)rarrN_(2)+2H_(2)O+NaCl`

Discussion

45.	Name the gas liberated when bromo ethane is heated with alcoholic potash.
Answer» ANSWER :The gas liberated is Ethane vor (or `C-(2)H_(5))`

Discussion

46.	Name the gas evolved when concentrated HCI is added to powdered potassium dichromate. On passing the evolved gas through acidified KBr solution, the solution turns brown. Write the balanced equations for the reactions involved.
Answer» Solution :`Cl_(2)` gas is evolved when conc. HCL reacts with powdered `K_(2)Cr_(2) O_(7)`. `{:(K_(2)Cr_(2)O_(7)+8 HCI rarr 2 KCI + 2 CrCl_(3) + 4 H_(2)O + 3 [O]),(""2 HCl + [O] rarr [H_(2)O + Cl_(2)] xx 3),(bar(K_(2)Cr_(2)O_(7)+14HCl rarr 2 KCL + 2 CrCl_(3) + 3 Cl_(2) + 7 H_(2)O)):}` SINCE `Cl_(2)` is a stronger oxidising agent than `Br_(2)`, therefore, when `Cl_(2)` is passed through acidified KBr solution. `Br_(2)` is liberated which turns solution brown. `Cl_(2) + 2 KBr rarr 2 KCl + Br_(2)` (turns solution brown)

Discussion

47.	Name the four bases present in DNA.
Answer» SOLUTION :ADENINE , GUANINE , THYMINE, CYTOSINE.

Discussion

48.	Namethe fourcategories in whichpolymershave beenclassifiedon the basis of magnitudeof forces present in them .
Answer» SOLUTION :(i) Elastomers (II) Fibres (iii) THERMOPLASTICS (iv) Thermosetting POLYMERS .

Discussion

49.	Namethe four basespresentin DNA. Whichone of these is not present in RNA ?
Answer» SOLUTION :Basespresentin DNA are ADENINE,cytosineand thymine.Thymineis notpresentin RNA.

Discussion

50.	Name the Following reaction.H_3C-Br+AgF to H_3C-F+AgBr
Answer» SOLUTION :SWARTZ (or) SWARTS

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Name the members of the lanthanoid series which exhibit (+4) oxidation states and those which exhibit (+2) oxidation states. Try to correlate this type of behaviour with the electronic configurations of these elements.

Name the members of the lanthanoid series which exhibit +2 oxidation states. Try to correlate this type of behaviour with the electronic configuration of these elements.

Name the members of the lanthanoid series which exhibit +4 oxidation states and those which exhibit +2 oxidation states. Try to correlate this type of behaviour with the electronic configuration of these elements.

Name the medicine which can be used both as an analgesic as well as an antipyretic.

Name the major product obtained when tertiary butyl bromide is heated with alcoholic KOH solution.

Name the major product obtained when an alkyl halide is treated with silver cyanide.

Name the major product formed when sodium phenoxide is heated with CO_(2) at 400K under 4-7 atm pressure. What is the name of the reaction?

Name the major product formed when the vapours of following alcohols are passed over hot cooper at 573K.

Name the major product formed when the vapours of following alcohols are passed over hot cooper at 573K. CH_(3)-CH(OH)CH_(3)

Name the major product formed when nitrous acid is treated with i) methylamine ii) aniline at low temperature

Name the major organic product formed in the following conversion.(i) When nitrous acid is treated with methyl lamine. (ii) Benzene diazonium chloride is treated with Kl

Name the major organic product formed when 2-bromopentane is heated with alcoholic potassium hydroxide solution.

Name the major product formed when nitrous acid is treated with Methylamine

Name the main product formed when bromoethane is treated with sodium metal in dry ether

Name the maindiesease causeddue tolackof viatmin and its source in eachof the following A, B_(6) and E.

Name the main constituents of dettol.

Name the macromolecules which are chosen as drug targets.

Name the macromolecules that are chosen as drug targets.

Name the linkage which prop- amino acids are joined in a linear fashion in proteins.

Name the linkage which joins two monosaccharide units through oxygen atoms.

Name the linkage connecting monosaccharide units in polysaccharides.

Name the law behind the dissolution of CO_(2) gas in soft drinks under high pressure.

Name the lanthanoid element which exhibits a +4 oxidation state besides +3 oxidation state.

Name the law behind the dissolution of CO_2 gas In soft drinks under high pressure.

Name the isomerism shown by the following pair of coordination compounds :

Name the isomerism exhibited by the co-ordination compounds? [Co(NH_(3))_(5)Br]SO_(4) and [Co(NH_(3))_(5)SO_(4)]Br Give ne test to distinguish between these two compounds.

Name the ionization isomer of [Cr(H_(2)O)_(5)Br]SO_(4)

Name the instrument used to measure conductance.

What are the biological functions of nucleic acids?

Name the hydrocarbon that is a liquid at STP.

Namethehormonethatcontain Iodine.

Name the halogen which forms only one oxo acid and also write the formula of the oxo acid.

Name the halogen-which forms only one oxo acid and also write the formula of the oxo acid of that halogen.

Name the halogen with lowest ionization energy.

Name the halogen which does not exhibit positive oxidation state .

Name the halogen present in Cryolite.

Name the gas that is released when propanol is treated with diazomethane.

Name the gas that is released when ethyl amine is treated with nitrous acid .

Name the gas that can readily decolourise acidified KMnO_(4) solution.

Name the gas that can readily decolourise acidified KMnO_(4) solution-

Name the gas other than CO_(2) which also turns lime water milky.

Name the gas liberated when zinc reacts with dil. HNO_(3)

Name the gas liberated when concentrated HCI is heated with MnO_(2) Give the equation for the reaction. Name the reagent used to obtain bleaching powder from chlorine.

Name the gas liberated whenaqueous solution of ammonium chlorideis mixed with sodium nitrite . Give equation.

Name the gas liberated when bromo ethane is heated with alcoholic potash.

Name the gas evolved when concentrated HCI is added to powdered potassium dichromate. On passing the evolved gas through acidified KBr solution, the solution turns brown. Write the balanced equations for the reactions involved.

Name the four bases present in DNA.

Namethe fourcategories in whichpolymershave beenclassifiedon the basis of magnitudeof forces present in them .

Namethe four basespresentin DNA. Whichone of these is not present in RNA ?

Name the Following reaction.H_3C-Br+AgF to H_3C-F+AgBr