94420 + Interview Questions in Chemistry in Class 12

1.	In nucleotide phosphate group is attached to
Answer» C-1 C-2 C-4 C-5 Answer :D

Discussion

2.	In nucleoside , a base is attached at1' position of sugar moiety. Nucleotide is formed by linking of phosphoric acid unit of the sugar unit of nucleoside. At which position of sugar unit is the phosphoric acid linked in a nucleoside to give a nucleotide ?
Answer» SOLUTION :Phosphoric acid unit is linked at 5' -position of SUGAR moiety of nucleoside to FORM a nucleotide.

Discussion

3.	In nucleoside adenine is attached to
Answer» C-2 C-1 C-3 C-4 Answer :B

Discussion

4.	In nucleoside base unit is attached at
Answer» position ONE of PENTOSE sugar unit position TWO of pentose sugar unit position THREE of pentose sugar unit position of four of pentose sugar unit Answer :A

Discussion

5.	In nucleosidea base is attachedat 1 position of sugar moiety . Nucleotide is formedbylinkingof phospheric acidunit ofnucleoside . At whichposition of sugarunitsis thephosphoricacid linked in a nucleoside to givea nucleotide ?
Answer» SOLUTION :Phosphoricacidis linked at 5 - POSITION of sugarmoiety of nucleosideto GIVEA nucleotide .

Discussion

6.	In nucleophilic substitution reaction aryl chloride resembles
Answer» ethyl chloride BENZYL chloride ALLYL chloride VINYL chloride ANSWER :D

Discussion

7.	In nucleophilic alphatic substitution , the nucleophilies are generally
Answer» Acids Bases Salts Neutral MOLECULES Solution :The nucleophiles are GENERALLY beases.

Discussion

8.	In nucleic acids, the sequence is represented as
Answer» PHOSPHATE - BASE - SUGAR Sugar - base - phosphate Base - sugar - phosphate Base - phosphate - sugar Answer :C

Discussion

9.	In nucleic acids, the sequence is
Answer» PHOSPHATE - BASE - SUGAR sugar- base-phosphate base- sugar - phosphate base- phosphate - sugar Answer :C

Discussion

10.	In nucleic acids, the sequence is :
Answer» Phosphate-sugar-base Sugar-base-phosphate Base-sugar-phosphate Base-phosphate-sugar Answer :C

Discussion

11.	Nucleic acids are :
Answer» Phosphate-base-sugar Sugar-base-phosphate Base-sugar-phosphate Base-phosphate-sugar Answer :C

Discussion

12.	In nucleic acids, the nucleotides are linked to one another through
Answer» HYDROGEN bond Peptide bond Glycosidic linkage Phosphate GROUPS ANSWER :D

Discussion

13.	In nucleic acids the nucleotide sub units linked by hydrogen bond b) Nucleic acids control heredity at molecular level (c) DNA is a dinucleotide and RNA is oligo- nucleotide The correct statement is
Answer» all a,C b only a only Answer :C

Discussion

14.	In nucleic acids, the nucleotides are joined together by
Answer» phosphoester LINKAGE PHOSPHODIESTER linkage PHOSPHODISULPHIDE linkage sulphodiester linkage. Answer :B

Discussion

15.	In nucleic acid the sequence is
Answer» base-phosphate-sugar base-sugar-phosphate sugar-base-phosphate phosphate-base-sugar Answer :B

Discussion

16.	In nucleicacid , the correctsequence is ……….. .
Answer» BASE - PHOSPHATE SUGAR phosphate- base-sugar sugare - base- phosphate base - sugar - phosphate ANSWER :D

Discussion

17.	In nuclear reactors, the moderator is :
Answer» CADMIUM Uranium-235 Uranium-238 Heavy water. Answer :D

Discussion

18.	In nuclear fission, 0.01% mass is converted into energy. The energy released by the fission of 100 kg mass will be:
Answer» `9 xx 10^(15) j` `9 xx 10^(11) KJ` `9 xx 10^(17) j` `9 xx 10^(13) J` Solution :`Delta m = 100 xx (0.01)/(100) = 0.01 kg` `E = Delta mc^(2) = 0.01 xx (3 xx 10^(8))^(2) J` `= 9 xx 10^(14) J = 9 xx 10^(11) kJ`

Discussion

19.	Compreshension-II In non-ideal solutions, at one of the intermediate compostions, the total vapour pressure is highest and the boiling point is lowest. At this point, the composition of the liquid and vapour phase is same. So, if liquid mixture vapouriese at this point and vapours are condensed, teh condensate contains same compositon as present in original liquid mixture. it means at this point liquid behaves like a pure liquid and is called an Azeotropic mixture. Which of the following cannot form low boiling point azeotrope ?
Answer» n-heptane & n-hexane Acetone & aniline Both (a) & (b) `CHCI_(3)&C_(2)H_(5)OH` SOLUTION :it is corrct answer.

Discussion

20.	In non polar molecular solids, molecules are held together by …………….............
Answer» London FORCES WEAK VANDERWAALS forces Strong electrostatic forces strong cohesive forces SOLUTION :London forces

Discussion

21.	In non polar molecular solids constituent molecules held together are by …………………
Answer» SOLUTION :LONDON FORCES

Discussion

22.	Compreshension-II In non-ideal solutions, at one of the intermediate compostions, the total vapour pressure is highest and the boiling point is lowest. At this point, the composition of the liquid and vapour phase is same. So, if liquid mixture vapouriese at this point and vapours are condensed, the condensate contains same compositon as present in original liquid mixture. it means at this point liquid behaves like a pure liquid and is called an Azeotropic mixture. A and B forms non-ideal solution showing positive deviation. Boiling pointof pure A and B is 350 K and 380 K respectively. The solution will bpoil at (approximate)
Answer» `250 K` `380 K` `GT 380 K` `lt 350 K` Solution :it is CORRCT ANSWER.

Discussion

23.	In non-ideal solutions, at one of the intermediate compositions, the total vapour pressure is highest and the boiling point is lowest. At this point, the composition of the liquid and vapour phase is same. So, if liquid mixture vapourises at this point and vapours are condensed, the condensate contains same composition as present in orginal liquid mixture. It means that at this point liquid behaves like a pure and is called asAzeotropic mixture. Choose the correct answer : Choose the correct statemnent
Answer» Ideal solutions connot be separated into their components by frectional DISTILLATION For ideal solution, entghalpy of mixing is always greater than zero Only non-ideal solution showing positive devialtion cannot be separeated out by FRATION distillation. Non-ideal solution showing both positive and ngative deviation cannot be separated out by FRACTIONAL distillation. Solution :it is CORRCT answer.

Discussion

24.	In NO_(3)^(-) ion, the nitrogen atom involves :
Answer» sp hybridisation `sp^(2)` hybridisation `sp^(3)` hybridisation `DSP^(2)` hybridisation ANSWER :B

Discussion

25.	In NO_(3)^(-) ion number of bond pairs and Ione pairs of electrons on nitrogen atom are
Answer» 2,2 3,1 1,3 4,0 Answer :D

Discussion

26.	In nitroprusside ion the iron and NO exist as Fe^(II) and NO^(+) rather than Fe^(III) and NO.These forms can be differntiated by :
Answer» estimating the CONCENTRATION of iron measuring the concentration of `CN^(-)` measuringthe SOLID state magnetic moment theremally decomposing compound Answer :C

Discussion

27.	In nitroprusside ion, the iron and NO exist asFe^(II) and NO^(+) rather than Fe^(III) and NO. These forms can be differentiated by
Answer» ESTIMATING the concentrationof iron MEASURING the concentration of`CN^(-)` measuring the solidestate magnetic moment thermally decomposig the compound. Solution :Magnetic moment HELPS to find the NUMBER of unpaired electrons.

Discussion

28.	In nitroprusside ion, the iron and NO exist as Fe^(II) and NO^(+) rather than Fe^(III) and NO. These forms can be differentated by :-
Answer» Estimating the CONCENTRATION of iron Measuring the concentration of `CN^("ϴ")` Measuring the SOLID state MAGNETIC moment Thermally DECOMPOSING the compound Answer :C

Discussion

29.	In nitrogen molecule, the two atoms of nitrogen are joined by
Answer» ONE SIGMA BOND and one pi bond Two sigma BONDS and one pi bond One sigma bond and two pi bonds Three sigma bonds Answer :3

Discussion

30.	In nitroprusside ion, the iron and NO exist as Fe^(II) and NO^+ rather than Fe^(III) and NO. These forms can be differentiated by
Answer» estimatinng the concentration of iron measuring the concentration of `CN^-` measuring the SOLID state magnetic MOMENT thermally DECOMPOSING the compound Answer :C

Discussion

31.	In nitroprusside ion, iron and NO exist as Fe (II) and NO^(+) rather than Fe (III) and NO. These forms can be differentiated by
Answer» estimating the concentration of iron measuring the concentration of `CN^(-)` measuring the solid STATE magnetic MOMENT thermally DECOMPOSING the compound Solution :In nitroprusside ion, Fe (II) has `d^(6)` configuration, i.e., 4 unpaired electrons which pair up for `d^(2)sp^(3)`-hybridisation and `NO^(+)` has also no unpaired electron. Hence, its magnetic moment is zero, i.e., it is diamagnetic. On the other HAND, Fe (III) has `d^(5)` configuration and NO has unpaired electron. Even after pairing up, unpaired electrons are present and it would have net magnetic moment.

Discussion

32.	In nitrogen cycle, the main products are
Answer» `NO and NO_(2)` `NO_(2) and N_(2)O_(3)` `NO and N_(2)O_(3)` `N_(2)O_(3) and N_(2)O_(5)` ANSWER :A

Discussion

33.	In nitro alkanes -NO_2 group is converted to -NH_2 group by the reaction with
Answer» `Sn"/"HCL` ZN DUST `Zn"/"NH_2` `Zn"/"NAOH` Answer :A

Discussion

34.	In nitrogen family the H-M-H bond angle in the hydrides MH_3 gradually becomes closer to 90^0 on going from N to Sb. This shows that gradually:
Answer» The BASIC strength of the HYDRIDES increases Almost PURE p-orbitals are used for M-H bonding The bond ENERGIES of M-H bond increases The bond pairs of electrons become farther APART from the central atom Answer :D

Discussion

35.	In nitriding process of steel
Answer» Steel is heated in an ATMOSPHERE of ammonia Steel is MADE red hot and then cooled Steel is made red hot and then plunged into oil for cooling none of these Solution :The proccess of producing a HARD coating of IRON nitride on steel is called nitriding.

Discussion

36.	In nitric oxide (NO) the oxidation state of nitrogen is :
Answer» `-2` `+1` `-1` `+2` ANSWER :D

Discussion

37.	In [Ni(en)_(3)]Cl_(2),the coordination number of Fe^(2+) is………. .
Answer» ANSWER :`6`

Discussion

38.	In NH_(4)OH is added to a solution containing Al_(2)(SO_(4))_(2) and MgSO_(4), which of the following will precipitate?
Answer» `Al(OH)_(3)` only `Mg(OH)_(2)`only `Al(OH)_(3)` and `Mg(OH)_(2)` `Fe^(3+), CR^(3-)` ANSWER :C

Discussion

39.	In nickel-cadmium storage cell , the electrolyte is
Answer» moist KOH dil `H_(2) SO_(4)` AQUEOUS `NH_(4)Cl` `Ni (OH)_(3)` (aq) Answer :A

Discussion

40.	In NH_(3) and PH_3, the common is
Answer» Odour Combustibility BASIC nature None of these Solution :`OVERSET(••)NH_(3) and overset(••)PH_3` both are basic because of the presence of lone parir of ELECTRONS.

Discussion

41.	In NH_(4)NO_(2), the oxidation number of nitrogen will be
Answer» `+3` `+5` `-3` and +3 `+3` and +5 Solution :`{:(NH_(4)NO_(2),hArr,overset()(N)H_(4)^(+),+,overset()(N)O_(2)^(-)),("(OXIDATION number)",,x+4=+1,,x-4=-1),(,,x=1-4=-3,,x=+3):}`

Discussion

42.	In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized by KMnO_(4) is
Answer» `SO_(3)^(2-)` `SO_(4)^(2-)` `SO_(2)` `SO_(5)^(2-)` SOLUTION :In neutral or faintly ALKALINE medium THIOSULPHATE is quantitatively oxidized by `KMnO_(4)` to `SO_(4)^(2-)` `8KMnO_(4)+3Na_(2)S_(2)O_(3)+ H_(2) O to 3K_(2)SO_(4)+8MnO_(2)+3Na_(2)SO_(4)+2KOH`

Discussion

43.	In neutral or faintly alkaline solution, 8 moles of permagnate anion quantitatively oxidize thiosulphate anions to produce X moles of a sulphur containing product. The magnitude of X is:
Answer» Solution :The INVOLVED reaction is: `8MnO_(4)^(-)+3S_(2)O_(3)^(2-)+H_(2)Orarr8MnO_(2)+6SO_(4)^(2-)+2OH^(-)` 8 MOLES of permangnate ion will give 6 mole of sulphur CONTAINING PRODUCT.

Discussion

44.	In neutral or basic solutions, glycosides do not show mutarotation. However, if the solutions are made acidic, glycosides show mutarotation. Explain.
Answer» Solution :Because glycosides are acetals, they UNDERGO HYDROLYSIS in aqueous ACID to form cyclic hemiacetals that then undergo mutarotation. Acetals are stable to BASE, and therefore in basic solution they do not show mutarotation.

Discussion

45.	In Nernst equation, the constant 0.0592 at 298 K represents the value of
Answer» `(RT)/(nF)` `(RT)/(F)` `(2.303 RT)/(nF)` `(2.303RT)/(F)` Answer :B::C::D

Discussion

46.	In Nernst equation the constant 0.0591 represents the value of
Answer» `(2.303RT)/(NF)` 2.303`(RT)/(F)` `(RT)/(nF)` `(2.303RT)/(nF)logQ^(0)` Answer :B

Discussion

47.	In Nef- Carbonylsynthesis of 2- nitropropane ontreatmentwith strongalkali andfollowedbyacificationwith 50% H_(2)SO_(4)givesa product , whichwill gives.
Answer» TOLLEN's TEST Haloformtest Hinsbergtest CARBYL AMINE reaction Answer :B

Discussion

48.	In Nef - Carbonyl synthesisof 1^(0)- nitroalkane treatmentwith NaOHfollowedbyacidificationwith 50% H_(2) SO_(4)gives.
Answer» ALDEHYDES ESTERS KETONES CARBOXYLICACIDS ANSWER :A

Discussion

49.	In nature a decay chain series starts with ""_90^232Th and finally terminates at ""_82^208Pb. A thorium ore sample was found to contain 8 xx 10^(-5) mL of helium at STP and 5xx10^9-7)g of ""^232Th . Find the age of the ore sample assuming the source of helium to be only the decay of ""^232Th . Also, assume complete retention of helium within the ore. Half-life of""^232Th= 1.39 xx 10^10years.
Answer» SOLUTION :`""_90^232Th to ""_82^208Pb + 6""_2^4He + 4 ""_(-1)^0 e` ` 4.89 XX 10^9` years

Discussion

50.	In NaCl, the Cl^- ions occupy the place in a fashion of:
Answer» fcc bcc Both None Answer :A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In nucleotide phosphate group is attached to

In nucleoside , a base is attached at1' position of sugar moiety. Nucleotide is formed by linking of phosphoric acid unit of the sugar unit of nucleoside. At which position of sugar unit is the phosphoric acid linked in a nucleoside to give a nucleotide ?

In nucleoside adenine is attached to

In nucleoside base unit is attached at

In nucleosidea base is attachedat 1 position of sugar moiety . Nucleotide is formedbylinkingof phospheric acidunit ofnucleoside . At whichposition of sugarunitsis thephosphoricacid linked in a nucleoside to givea nucleotide ?

In nucleophilic substitution reaction aryl chloride resembles

In nucleophilic alphatic substitution , the nucleophilies are generally

In nucleic acids, the sequence is represented as

In nucleic acids, the sequence is

In nucleic acids, the sequence is :

Nucleic acids are :

In nucleic acids, the nucleotides are linked to one another through

In nucleic acids the nucleotide sub units linked by hydrogen bond b) Nucleic acids control heredity at molecular level (c) DNA is a dinucleotide and RNA is oligo- nucleotide The correct statement is

In nucleic acids, the nucleotides are joined together by

In nucleic acid the sequence is

In nucleicacid , the correctsequence is ……….. .

In nuclear reactors, the moderator is :

In nuclear fission, 0.01% mass is converted into energy. The energy released by the fission of 100 kg mass will be:

In non polar molecular solids, molecules are held together by …………….............

In non polar molecular solids constituent molecules held together are by …………………

In NO_(3)^(-) ion, the nitrogen atom involves :

In NO_(3)^(-) ion number of bond pairs and Ione pairs of electrons on nitrogen atom are

In nitroprusside ion the iron and NO exist as Fe^(II) and NO^(+) rather than Fe^(III) and NO.These forms can be differntiated by :

In nitroprusside ion, the iron and NO exist asFe^(II) and NO^(+) rather than Fe^(III) and NO. These forms can be differentiated by

In nitroprusside ion, the iron and NO exist as Fe^(II) and NO^(+) rather than Fe^(III) and NO. These forms can be differentated by :-

In nitrogen molecule, the two atoms of nitrogen are joined by

In nitroprusside ion, the iron and NO exist as Fe^(II) and NO^+ rather than Fe^(III) and NO. These forms can be differentiated by

In nitroprusside ion, iron and NO exist as Fe (II) and NO^(+) rather than Fe (III) and NO. These forms can be differentiated by

In nitrogen cycle, the main products are

In nitro alkanes -NO_2 group is converted to -NH_2 group by the reaction with

In nitrogen family the H-M-H bond angle in the hydrides MH_3 gradually becomes closer to 90^0 on going from N to Sb. This shows that gradually:

In nitriding process of steel

In nitric oxide (NO) the oxidation state of nitrogen is :

In [Ni(en)_(3)]Cl_(2),the coordination number of Fe^(2+) is………. .

In NH_(4)OH is added to a solution containing Al_(2)(SO_(4))_(2) and MgSO_(4), which of the following will precipitate?

In nickel-cadmium storage cell , the electrolyte is

In NH_(3) and PH_3, the common is

In NH_(4)NO_(2), the oxidation number of nitrogen will be

In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized by KMnO_(4) is

In neutral or faintly alkaline solution, 8 moles of permagnate anion quantitatively oxidize thiosulphate anions to produce X moles of a sulphur containing product. The magnitude of X is:

In neutral or basic solutions, glycosides do not show mutarotation. However, if the solutions are made acidic, glycosides show mutarotation. Explain.

In Nernst equation, the constant 0.0592 at 298 K represents the value of

In Nernst equation the constant 0.0591 represents the value of

In Nef- Carbonylsynthesis of 2- nitropropane ontreatmentwith strongalkali andfollowedbyacificationwith 50% H_(2)SO_(4)givesa product , whichwill gives.

In Nef - Carbonyl synthesisof 1^(0)- nitroalkane treatmentwith NaOHfollowedbyacidificationwith 50% H_(2) SO_(4)gives.

In NaCl, the Cl^- ions occupy the place in a fashion of: