94420 + Interview Questions in Chemistry in Class 12

1.	SF_(2), SF_(4) and SF_(6)have hybridisations at sulphur atom respectively as
Answer» `SP^(2), sp^(3), sp^(3)d^(2)` `sp^(3)sp^(3), sp^(3)d^(2)` `sp^(3), sp^(3)d, sp^(3)d^(2)` `sp^(3), SPD^(2), d^(2)sp^(3)` SOLUTION :

Discussion

2.	Sewage water can be purified for recycling with the action of
Answer» AQUATIC plants Penicillin Micro-organisms Fishes Solution :Because micro-organisms can DECOMPOSE COMPLEX organic compounds into SIMPLE organic compound

Discussion

3.	Several short-lived radioactive species have been used to determine the age of wood or animal fossils. One of the most intresting substance is ""_(6)C""^(14)(half-life fossils, etc.). Carbon-14 is produced by the bombardment of nitrogen atoms present in the upper atmosphere with neutrons (from cosmic rays). ""_(7)N""^(14)+""_(0)n""^(1)to""_(6)C""^(14)+""_(1)H""_(1) Thus carbon-14 is oxidised, to CO""_(2) and eventually lingested by land animals. The death of plants or animals put an end to the intake of C""_(14) from the atmosphere. After this the amount of C""_(14) in the dead tissues starts decreasing due to its disintegration as per the following reaction : ""_(6)C""^(14)to""_(7)N""^(14)+""_(-1)beta""^(0) The C""^(14) isotope enters the biosphjere when carbon dioxide is taken up in plant photosynthesis. Plants are eaten by animals, which exhale C""^(14) as CO""_(2). Eventually, C""^(14) participates in many aspects of carbon cycle. The C""^(14) lost by radioactive decay-replenishment process, a dynamic rquillibrium is established whereby the ratio of C""^(14) to C""^(12) remains constant in living matter. But when an individual plant or an animal dies, the C""^(14) isotpe inn it is no longer replenished, so the ratio decreases as C""^(14) decays. So, ther number C""^(14) nuclei after time t (after the death of living matter) would be less than in a livingthe following formula, t""_(1//2)=0.693/? The intensity of the cosmic rays have remain the same for 30,000 years. But since some years changes in this are observed due to excessive burning of fossil fuel and nuclear test? A nuclear explosion has taken place leading to increase in concentration of C""^(14) in nearby areas. C""^(14) concentration is C""_(1) in nearly areas and C""_(2) in areas far away. If the age of the fossil is determined to be T""_(1) and T""_(2) at the respective places then
Answer» The age of the FOSSIL will inrease at the where EXPLOSION has taken place and `T""_(1)-T""_(2)=1/lamda"in"C""_(1)/(C""_(2))` The age of the fossil will decrease at the place where explosion has taken place and `T""_(1)-T""_(2)=1/lamda"in"C""_(1)/(C""_(2))` The age of the fossil will DETERMINED to be same `T""_(1)/T""_(2)=C""_(1)/C""_(2)` Solution :`N//A`

Discussion

4.	Sewagecontainingorganicwasteshouldbedisposedin waterbodiesbecauseit causesmajorwater pollution . Fishessucha pollutedwaterdie because of
Answer» Larger NUMBEROF MOSQUITOES. Increase in the amountofdissolvedoxygen DECREASE in the amountof dissolvedoxygenin water. Cloggingof gillsby mud. ANSWER :C

Discussion

5.	Several short-lived radioactive species have been used to determine the age of wood or animal fossils. One of the most intresting substance is ""_(6)C""^(14)(half-life fossils, etc.). Carbon-14 is produced by the bombardment of nitrogen atoms present in the upper atmosphere with neutrons (from cosmic rays). ""_(7)N""^(14)+""_(0)n""^(1)to""_(6)C""^(14)+""_(1)H""_(1) Thus carbon-14 is oxidised, to CO""_(2) and eventually lingested by land animals. The death of plants or animals put an end to the intake of C""_(14) from the atmosphere. After this the amount of C""_(14) in the dead tissues starts decreasing due to its disintegration as per the following reaction : ""_(6)C""^(14)to""_(7)N""^(14)+""_(-1)beta""^(0) The C""^(14) isotope enters the biosphjere when carbon dioxide is taken up in plant photosynthesis. Plants are eaten by animals, which exhale C""^(14) as CO""_(2). Eventually, C""^(14) participates in many aspects of carbon cycle. The C""^(14) lost by radioactive decay-replenishment process, a dynamic rquillibrium is established whereby the ratio of C""^(14) to C""^(12) remains constant in living matter. But when an individual plant or an animal dies, the C""^(14) isotpe inn it is no longer replenished, so the ratio decreases as C""^(14) decays. So, ther number C""^(14) nuclei after time t (after the death of living matter) would be less than in a livingthe following formula, t""_(1//2)=0.693/? The intensity of the cosmic rays have remain the same for 30,000 years. But since some years changes in this are observed due to excessive burning of fossil fuel and nuclear test? What should be the age of the fossil meaningful determination of its age?
Answer» 6 years 6000 years 60000 years can be USED to DETERMINE any age Solution :`N//A`

Discussion

6.	Several isomeric amines are possible with the molecular formula C_(8)H_(11)N. On the basis of the reaction given by each of the isomers, identify the structure of the compound. a) A(C_(8)H_(11)N)overset(NaNO_(2)-HCl)underset(0-5^(@)C)to p-Nitroso compound b) B(C_(8)H_(11)N)overset(NaNO_(2)-HCl)underset(0-5^(@)C)to Diazonium salt formed c) C(C_(8)H_(11)N)overset(NaNO_(2)-HCl)underset(0-5^(@)C)to N-Nitroso compound formed The structure of 'C' is
Answer» All the above Solution :`1^(@)` AROMATIC AMINE form diazonium SALT , `2^(@)` aromatic amine FORMS N-nitroso compound `3^(@)` aromatic amine form , P-nitoso compound

Discussion

7.	Several isomeric amines are possible with the molecular formula C_(8)H_(11)N. On the basis of the reaction given by each of the isomers, identify the structure of the compound. a) A(C_(8)H_(11)N)overset(NaNO_(2)-HCl)underset(0-5^(@)C)to p-Nitroso compound b) B(C_(8)H_(11)N)overset(NaNO_(2)-HCl)underset(0-5^(@)C)to Diazonium salt formed c) C(C_(8)H_(11)N)overset(NaNO_(2)-HCl)underset(0-5^(@)C)to N-Nitroso compound formed The structure of 'B' is
Answer» All the above SOLUTION :`1^(@)` AROMATIC amine form diazonium salt , `2^(@)` aromatic amine forms N-nitroso COMPOUND `3^(@)` aromatic amine form , P-nitoso compound

Discussion

8.	Several isomeric amines are possible with the molecular formula C_(8)H_(11)N. On the basis of the reaction given by each of the isomers, identify the structure of the compound. a) A(C_(8)H_(11)N)overset(NaNO_(2)-HCl)underset(0-5^(@)C)to p-Nitroso compound b) B(C_(8)H_(11)N)overset(NaNO_(2)-HCl)underset(0-5^(@)C)to Diazonium salt formed c) C(C_(8)H_(11)N)overset(NaNO_(2)-HCl)underset(0-5^(@)C)to N-Nitroso compound formed The structure of 'A' is likely to be
Answer» Solution :`1^(@)` AROMATIC amine FORM DIAZONIUM salt , `2^(@)` aromatic amine forms N-nitroso compound `3^(@)` aromatic amine form , P-nitoso compound

Discussion

9.	Several alkaloids are extracted from the extracts of the plants called marijuana. Marijuana owes its activity to tetrahydro cannabinol, which contains 70% as many as carbon atoms as hydrogen atoms and 15 times as many hydrogen atoms as oxygen atoms. One gram of tetrahydro cannabinol is 0.00318. Percentage composition of carbon in the compound is:
Answer» 0.6046 0.7085 0.8025 0.5964 Answer :C

Discussion

10.	Several alkaloids are extracted from the extracts of the plants called marijuana. Marijuana owes its activity to tetrahydro cannabinol, which contains 70% as many as carbon atoms as hydrogen atoms and 15 times as many hydrogen atoms as oxygen atoms. One gram of tetrahydro cannabinol is 0.00318. Molecular formula of the compound is:
Answer» `C_(21)H_(30)O_(2)` `C_(21)H_(14)O_(3)` `C_(21)H_(46)O` NONE of these. Answer :A

Discussion

11.	Several alkaloids are extracted from the extracts of the plants called marijuana. Marijuana owes its activity to tetrahydro cannabinol, which contains 70% as many as carbon atoms as hydrogen atoms and 15 times as many hydrogen atoms as oxygen atoms. One gram of tetrahydro cannabinol is 0.00318. Number of oxygen atoms in 1 mol of the tetrahydro cannabinol is:
Answer» `2N_(A)` `N_(A)` `3N_(A)` `4N_(A)` ANSWER :A

Discussion

12.	Several alkaloids are extracted from the extracts of the plants called marijuana. Marijuana owes its activity to tetrahydro cannabinol, which contains 70% as many as carbon atoms as hydrogen atoms and 15 times as many hydrogen atoms as oxygen atoms. One gram of tetrahydro cannabinol is 0.00318. Molecular mass of the compound is:
Answer» 413amu 314amu 143amu 341amu Answer :B

Discussion

13.	Setting of plaster of paris involves:
Answer» OXIDATION with ATMOSPHERIC oxygen Combination with atmospheric `CO_2` Dehydration Hydration to YIELD ANOTHER hydrate Answer :D

Discussion

14.	Set up Nernst equation for the standard dry cell. Using this eqation show that the voltage of a dry cell has to decrease with use.
Answer» Solution :The voltage of an electrochemical cell is related to the concentration of the solutions involved in the cell. A change in concentration of cell solutions results in a change in voltage that can be quantitatively described by the Nernst equation. The voltage of an electrochemical cell involves an oxidation reaction and a reduction reaction. In the case of a copper-zinc cell the two half reactions are WRITTEN as REDUCTIONS , and their STANDARD cell potentials are : `Cu^(2+)(aq) + 2e to Cu(s)` reduction =`+0.34V` `Zn^(2+)(aq) + 2e to Zn`(s) reduction =-0.76 V Copper will be reduction species in the copper-zinc cell due it's larger standard reduction potential. The voltage then for a Zn, `Zn^(2+)"\|\|"Cu^(2+) + Zn^(2+)(aq)` Equation 1 : ex. `Cu^(2+)(aq) + 2e to Cu(s) E^(@)` reduction =+0.34 V `Zn(s) + Zn^(2+)(aq) to2e^(-)E^(@)` oxidation =-0.76 V `E_("cell") =E_("reduction")-E_("oxidation")` `+1.10 V =+0.34 V-(-0.76 V)` The voltage fo any electrochemical cell is a function of the molar concentrations of the compounds involved in the cell, as described by the Nernst equation : `aA(s) + bB^(+) (aq) to cC(s)+ DD^(+)(aq)` Equation 2:`E_("cell")=E^(@)-(0.06//n)log{D^(+]d)//[B^(+)]^(b)}` Wquation 3: Using equation 1 as the balanced chemical equation for the `Zn, Zn^(2+)\|\|Cu^(2+) , Cu` cell. Equation 3 becomes : `E_("cell") =E^(@)-(*0.03)log{Zn^(2+]//[Cu^(2+)]` As the `Cu^(2+)` concentration decreases the coltage fo the cell changes . The `Cu^(2+)` concentration can change due to dilution, or due to the formation of a complex ion, `Cu(NH_(3))_(4)^(2+)` , upon addition of `NH_(3)`

Discussion

15.	Setting of cement is an:
Answer» EXOTHERMIC process ENDOTHERMIC process Neither endothermic nor exothermic None of these Answer :A

Discussion

16.	Set of d-orbitals which is used by central metal during formation of MnO_(4)^(-)?
Answer» `d_(x^(2)-y^(2)),d_(x^(2)),d_(XY)` `d_(xy),d_(YZ),d_(XZ)` `d_(x^(2)-y^(2)),d_(xy),d_(xz)` `d_(x^(2)-y^(2)),d_(z^(2)),d_(xz)` Solution :Hybridisation of Mn in `MnO_(4)^(-):d^(3)s`

Discussion

17.	Set of elements known as chalcogens is :
Answer» <P> O, S, Se,<BR>CI, Br, I N, P, S C, Si, Ge Answer :A

Discussion

18.	Set of elements known as chalcogens is : 1) O, S, Se, 2) CI, Br, I 3) N, P, S 4) C, Si, Ge
Answer» <P> O, S, Se, CI, Br, I N, P, S C, Si, Ge Answer :A

Discussion

19.	Set -I (without catalyst) {:(,"Reaction",,"Temperature",,"E(activation)",,"k"),(,ArarrB,,T_(1)K,,Ea_(1),,k_(1)),(,A rarr B,,T_(2)K,,Ea_(2),,k_(2)):} Set-II (with catalyst) (consider +ve catalyst only) {:(,"Reaction",,"Temperature",,"E(activation)",,"k"),(,A rarr B,,T_(1)K,,Ea_(3),,k_(3)),(,A rarr B,,T_(2)K,,Ea_(4),,k_(4)):} For the Set-I:
Answer» `Ea_(1)gt Ea_(2)if T_(1) gt T_(2)` `Ea_(1) LT Ea_(2) if T_(1) gt T_(2)` `Ea_(1) = Ea_(2)` `Ea_(1)=0.5 Ea_(2)` ANSWER :C

Discussion

20.	Set -I (without catalyst) {:(,"Reaction",,"Temperature",,"E(activation)",,"k"),(,ArarrB,,T_(1)K,,Ea_(1),,k_(1)),(,A rarr B,,T_(2)K,,Ea_(2),,k_(2)):} Set-II (with catalyst) (consider +ve catalyst only) {:(,"Reaction",,"Temperature",,"E(activation)",,"k"),(,A rarr B,,T_(1)K,,Ea_(3),,k_(3)),(,A rarr B,,T_(2)K,,Ea_(4),,k_(4)):} Comparing Set-I and II:
Answer» `k_(4) gt k_(3) and k_(2)k_(1), if T_(2) gt T_(1)` (endothermic) `k_(4) LT k_(3) and k_(2) gt k_(1) if T_(2) lt T_(1)` (endothermic) `k_(4) gt k_(3) and k_(2) gt k_(1) if T_(2) lt T_(1)` (EXOTHERMIC) `k_(4) lt k_(3) and k_(2) lt k_(1) , if T_(2) gt T_(1)` (exothermic) Answer :A

Discussion

21.	Set -I (without catalyst) {:(,"Reaction",,"Temperature",,"E(activation)",,"k"),(,ArarrB,,T_(1)K,,Ea_(1),,k_(1)),(,A rarr B,,T_(2)K,,Ea_(2),,k_(2)):} Set-II (with catalyst) (consider +ve catalyst only) {:(,"Reaction",,"Temperature",,"E(activation)",,"k"),(,A rarr B,,T_(1)K,,Ea_(3),,k_(3)),(,A rarr B,,T_(2)K,,Ea_(4),,k_(4)):} For the Set-I:
Answer» If `T_(1) gt T_(2),k_(1)gt k_(2)` always If `T_(1) gt T_(2),k_(1) gt k_(2)` (for exothermic reaction) If `T_(1) gt T_(2), k_(1) LT k_(2)` (for endothermic reaction) `Ea_(1) NE Ea_(2)` ANSWER :A

Discussion

22.	{:("Set-I",, "Set-II") ,((A) "Noradrenaline" ,, (1) "Stable mental process" ),( (B) "Dopamine",, (2) "Regulation of control of movement "),( (C) "Serotonin",, (3) "Mood changes"),((D) "Histamine ",, (4) "Mild aches & pains "),((-),, (5) "Secretion of HCl "):}
Answer» `{:(A,B,C,D) ,(1,2,3,5):}` `{:(A,B,C,D) ,(3,2,1,5):}` `{:(A,B,C,D) ,(3,2,4,5):}` `{:(A,B,C,D) ,(2,3,4,1):}` ANSWER :B

Discussion

23.	Set containing isoelectronic species is/are
Answer» `C_(2)^(2-), NO^(+), CN^(-), O_(2)^(2+)` `CO, NO, O_2, CN` `CO_2, NO_2, O_2, N_2O_5` `CO,CO_2, NO, NO_2` SOLUTION :`C_(2)^(2-) (12 + 2) , NO^(+) (7 + 8 - 1), CN^(-) (6 + 7 + 1)` and `O_(2)^(2+) (16 - 2)` are all isoelectronic SPEICES.

Discussion

24.	{:("SET-1","SET-2"),((1)"Ostwald-walker",(A) "Osmotic pressure"),((2)"Cotrell's method",(B)"Depression of F.P"),((3)"Rast's camphor method","(C) Elevation of B.P"),((4)"Berkeley and Hartley's method",(D)"Lowering of vapour pressure" ):}
Answer» `{:(A,B,C,D),(4,3,2,1):}` `{:(A,B,C,D),(1,2,3,4):}` `{:(A,B,C,D),(2,3,4,1):}` `{:(A,B,C,D),(2,4,3,1):}` ANSWER :A

Discussion

25.	{:("List - I","List - II"),("(1) Steriod hormone","(a) Cytokinins"),("(2) None steroid hormone","(b) Estrogens"),("(3) Plant hormone","(c ) Auxins"),("(4) Peptide hormone","(d) Insulin"):}The correct match is
Answer» `1 - B, 2- b, 3 - C, 4 - d` `1-b, 2- a, 3 - d, 4-c` `1 - b, 2- a, 3-c, 4-d` `1 - c, 2-a, 3- d, 4 - b` Answer :C

Discussion

26.	{:("SET-1","SET-2"),((i)"RBC in 0.5% NaCl solution",(A)"Swells"),((ii)"RBC in 1% NaCl solution",(B)"Shrinks"),((iii)"egg (outer shell removed in water)",.),((iv)"egg(outer shell removed in NaCl solution)",.):}
Answer» i-A ii-B iii-A iv-A Answer :D

Discussion

27.	Sesquoxides of alkali metals may be represented by the formula :
Answer» `M_(2)O_(5)` `M_(2)O_(3)` `MO_(2)` `M_(2)O_(2)` ANSWER :B

Discussion

28.	Sesquioxide of lead is :
Answer» `PBO` `PbO_2` `Pb_2O` `Pb_2O_3` ANSWER :D

Discussion

29.	Serpeck's process is used for the extraction of :
Answer» Mg Ni Al Cu Answer :C

Discussion

30.	Serpeck's process is used for bauxite which has following main impurity :
Answer» `SiO_(2)` `Fe_(2)O_(3)` `Fe_(3)O_(4)` `CAO` ANSWER :A

Discussion

31.	Serpeck process may be used to prepare
Answer» CYANIDE ISOCYANIDE ammonia nitric ACID ANSWER :3

Discussion

32.	Sequence of acidic character is
Answer» `SO_2 GT CO_2 gt CO gt N_2O_5` `SO_2 gt N_2O_5 gt CO gt CO_2` `N_2O_5 gt SO_2 gt CO gt CO_2` `N_2O_5 gt SO_2 gt CO_2 gt CO` ANSWER :D

Discussion

33.	Separation of two layers are seen when Lucas reagent is treated with
Answer» `CH_3OH` `CH_3Cl` `(CH_3)_3C-OH` `(CH_3)_3C-Cl` ANSWER :C

Discussion

34.	Separation of organic compounds by column chromatography is due to:
Answer» SELECTIVE ADSORPTION Selective absorption Solubilities Selective adsorption and selective absorption Answer :A

Discussion

35.	Separationof basic radicals is based on (a) ____ and (b) ____.
Answer» Answer :COMMON ION EFFECT,B. `K_(sp)` velues

Discussion

36.	Separating of d and l enantiomorphs from a racemic mixture iscalled
Answer» RESOLUTION DEHYDRATION Rotation Dehydrohalogenation ANSWER :A

Discussion

37.	Separating of d and l enantiorphs from a racemic mixture is called
Answer» Resolution DEHYDRATION ROTATION Dehydrohalogenation Solution :Recemic mixture can be separated into its two OPTICALLY acitve form by a process called resolution.

Discussion

38.	Semiconductors are solids with conductivities in the range of _________________.
Answer» Solution :`10^(-6)" to "10^(4)"OHM"^(-1)m^(-1)`

Discussion

39.	Semiconductors are purified by ______ method.
Answer» ZONE refining Electrolytic refining Mond's process Beisemerisation Answer :A

Discussion

40.	Semi conservative method of DNA duplication means
Answer» Newly synthesized DNA is CONSERVED only in ONE CELL cycle Newly synthesized DNA molecules have one strand from the parant DNA molecule Replication of DNA results in the formation of only one STRANDED DAUGHTER DNA Only one strand of DNA molecule from RNA Answer :B

Discussion

41.	Semicarbzide is :
Answer» `NH_2CONH_2` `NH_2-NH_2` `NH_2CONHNH_2` None Answer :C

Discussion

42.	Self-ionisation of liquid ammonia occurs as, 2NH_(3) rarr NH_(4)^(+) + NH_(2)^(-), K = 10^(-10). In this solvent, an acid might be
Answer» `NH_(4)^(+)` `NH_(3)` Any species that will form `NH_(4)^(+)` All of these Solution :A SUBSTANCE which an DONATE a proton is known as ACID so `NH_(4)^(+)` will be a acid.

Discussion

43.	Selet correct statement.
Answer» Saccharine is artificial SWEETENER. SOAPS are Na or K salt HIGHER carboxylic acid. Tetercycline is antibiotic. Cetyltrimethyl AMMONIUM bromide is ANIONIC detergent. Solution :N//A

Discussion

44.	Self-condensation of two moles of ethyl acetate in presence of sodium ethoxide yields.
Answer» ETHYL propionate ethyl butyrate acetoacetic ester methyl acetoacetate Answer :C

Discussion

45.	Selectr true statement about this reaction :
Answer» Degree of unsaturation is 10 for major product Major product have 3 OXYGEN ATOM PER molecule There is no S atom in major ORGANIC product Major organic product is heterocyclic compound Solution :Product is

Discussion

46.	Selecting the correct statement if any from the following
Answer» during zone rofining of silicon the metal is more soluble in the melt than the impurity metals like Fe, Ag, Zn and HG are extracted/punfied by PYROMETALLURGY white bauxite ore cannot be concentrated by serpeck's process dolomite, magnesile and graphite are used as retractory materials fumaces SOLUTION :In zone refining impurities are more soluble in melt than metal. Metal like Fe, Zn, Hg are extracted by pyro metallurgy but not .Ag. White bauxite is PURIFIED by Serpeck.s process . Doilamite, Magnesite and graphite are used as REFRACTORY materials in furnace.

Discussion

47.	Selected the correct option :
Answer» can be differentiated by VICTOR MEYER's test. can be differentiated by Bielstien test. GIVE purple COLOUR with `FeCl_(3)` withNaOI`Me-overset(O)overset(\|\|)(C)-overset(O)overset(\|\|)(C)-H` gives SODIUM oxalate. Solution :N//A

Discussion

48.	Selecthe correct statement(s):
Answer» PHYSICAL chemistry Physical Chemistry Cation and ANION are called basic and acidic radical RESPECTIVELY `[NiCl_4]^(2-)` is alow SPIN complex. Answer :C

Discussion

49.	Selected incorrect satment.
Answer» p can turn blue LITMUS red p can not give effervescence of `CO_(2)` with` NaHCO_(3)` It is Dieckmann CONDENSATION Product is a bicylo compound SOLUTION :

Discussion

50.	Selected method used to estimate methoxy group in organic compound :
Answer» HERZIG Meryer METHOD KJELDAHL method Zeisel method CARIUS method Solution :N//A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

SF_(2), SF_(4) and SF_(6)have hybridisations at sulphur atom respectively as

Sewage water can be purified for recycling with the action of

Sewagecontainingorganicwasteshouldbedisposedin waterbodiesbecauseit causesmajorwater pollution . Fishessucha pollutedwaterdie because of

Setting of plaster of paris involves:

Set up Nernst equation for the standard dry cell. Using this eqation show that the voltage of a dry cell has to decrease with use.

Setting of cement is an:

Set of d-orbitals which is used by central metal during formation of MnO_(4)^(-)?

Set of elements known as chalcogens is :

Set of elements known as chalcogens is : 1) O, S, Se, 2) CI, Br, I 3) N, P, S 4) C, Si, Ge

{:("Set-I",, "Set-II") ,((A) "Noradrenaline" ,, (1) "Stable mental process" ),( (B) "Dopamine",, (2) "Regulation of control of movement "),( (C) "Serotonin",, (3) "Mood changes"),((D) "Histamine ",, (4) "Mild aches & pains "),((-),, (5) "Secretion of HCl "):}

Set containing isoelectronic species is/are

{:("SET-1","SET-2"),((1)"Ostwald-walker",(A) "Osmotic pressure"),((2)"Cotrell's method",(B)"Depression of F.P"),((3)"Rast's camphor method","(C) Elevation of B.P"),((4)"Berkeley and Hartley's method",(D)"Lowering of vapour pressure" ):}

{:("List - I","List - II"),("(1) Steriod hormone","(a) Cytokinins"),("(2) None steroid hormone","(b) Estrogens"),("(3) Plant hormone","(c ) Auxins"),("(4) Peptide hormone","(d) Insulin"):}The correct match is

{:("SET-1","SET-2"),((i)"RBC in 0.5% NaCl solution",(A)"Swells"),((ii)"RBC in 1% NaCl solution",(B)"Shrinks"),((iii)"egg (outer shell removed in water)",.),((iv)"egg(outer shell removed in NaCl solution)",.):}

Sesquoxides of alkali metals may be represented by the formula :

Sesquioxide of lead is :

Serpeck's process is used for the extraction of :

Serpeck's process is used for bauxite which has following main impurity :

Serpeck process may be used to prepare

Sequence of acidic character is

Separation of two layers are seen when Lucas reagent is treated with

Separation of organic compounds by column chromatography is due to:

Separationof basic radicals is based on (a) and (b) .

Separating of d and l enantiomorphs from a racemic mixture iscalled

Separating of d and l enantiorphs from a racemic mixture is called

Semiconductors are solids with conductivities in the range of _________________.

Semiconductors are purified by ______ method.

Semi conservative method of DNA duplication means

Semicarbzide is :

Self-ionisation of liquid ammonia occurs as, 2NH_(3) rarr NH_(4)^(+) + NH_(2)^(-), K = 10^(-10). In this solvent, an acid might be

Selet correct statement.

Self-condensation of two moles of ethyl acetate in presence of sodium ethoxide yields.

Selectr true statement about this reaction :

Selecting the correct statement if any from the following

Selected the correct option :

Selecthe correct statement(s):

Selected incorrect satment.

Selected method used to estimate methoxy group in organic compound :

Explore topic-wise InterviewSolutions in Current Affairs.

SF_(2), SF_(4) and SF_(6)have hybridisations at sulphur atom respectively as

Sewage water can be purified for recycling with the action of

Sewagecontainingorganicwasteshouldbedisposedin waterbodiesbecauseit causesmajorwater pollution . Fishessucha pollutedwaterdie because of

Setting of plaster of paris involves:

Set up Nernst equation for the standard dry cell. Using this eqation show that the voltage of a dry cell has to decrease with use.

Setting of cement is an:

Set of d-orbitals which is used by central metal during formation of MnO_(4)^(-)?

Set of elements known as chalcogens is :

Set of elements known as chalcogens is : 1) O, S, Se, 2) CI, Br, I 3) N, P, S 4) C, Si, Ge

{:("Set-I",, "Set-II") ,((A) "Noradrenaline" ,, (1) "Stable mental process" ),( (B) "Dopamine",, (2) "Regulation of control of movement "),( (C) "Serotonin",, (3) "Mood changes"),((D) "Histamine ",, (4) "Mild aches & pains "),((-),, (5) "Secretion of HCl "):}

Set containing isoelectronic species is/are

{:("SET-1","SET-2"),((1)"Ostwald-walker",(A) "Osmotic pressure"),((2)"Cotrell's method",(B)"Depression of F.P"),((3)"Rast's camphor method","(C) Elevation of B.P"),((4)"Berkeley and Hartley's method",(D)"Lowering of vapour pressure" ):}

{:("List - I","List - II"),("(1) Steriod hormone","(a) Cytokinins"),("(2) None steroid hormone","(b) Estrogens"),("(3) Plant hormone","(c ) Auxins"),("(4) Peptide hormone","(d) Insulin"):}The correct match is

{:("SET-1","SET-2"),((i)"RBC in 0.5% NaCl solution",(A)"Swells"),((ii)"RBC in 1% NaCl solution",(B)"Shrinks"),((iii)"egg (outer shell removed in water)",.),((iv)"egg(outer shell removed in NaCl solution)",.):}

Sesquoxides of alkali metals may be represented by the formula :

Sesquioxide of lead is :

Serpeck's process is used for the extraction of :

Serpeck's process is used for bauxite which has following main impurity :

Serpeck process may be used to prepare

Sequence of acidic character is

Separation of two layers are seen when Lucas reagent is treated with

Separation of organic compounds by column chromatography is due to:

Separationof basic radicals is based on (a) ____ and (b) ____.

Separating of d and l enantiomorphs from a racemic mixture iscalled

Separating of d and l enantiorphs from a racemic mixture is called

Semiconductors are solids with conductivities in the range of _________________.

Semiconductors are purified by ______ method.

Semi conservative method of DNA duplication means

Semicarbzide is :

Self-ionisation of liquid ammonia occurs as, 2NH_(3) rarr NH_(4)^(+) + NH_(2)^(-), K = 10^(-10). In this solvent, an acid might be

Selet correct statement.

Self-condensation of two moles of ethyl acetate in presence of sodium ethoxide yields.

Selectr true statement about this reaction :

Selecting the correct statement if any from the following

Selected the correct option :

Selecthe correct statement(s):

Selected incorrect satment.

Selected method used to estimate methoxy group in organic compound :

Separationof basic radicals is based on (a) and (b) .