52671 + Interview Questions in Chemistry in Class 11

1.	In th eLassaigne's test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:
Answer» `Na_(4)[Fe(CN)_(6)]` `Fe_(4)[Fe(CN)_(6)]_(3)` `Fe_(2)[Fe(CN)_(6)]` `Fe_(3)[Fe(CN)_(6)]_(4)` Answer :B

Discussion

2.	In terms of work, the decrease in free energy during aprocess is equal to "…................"
Answer» SOLUTION :useful ( or MAXIMUM ) WORK DONE by the system

Discussion

3.	In terms of rate constants for forward and backward reactions (k_(f) and k_(b)) , equilibrium constant of a reaction is equal to …………. .
Answer» ANSWER :`k_(F)//k_(B)`

Discussion

4.	In terms of period and groups where would you locate the element with Z = 114 ?
Answer» Solution :The element has the configuration [Rn] `5f^46d^107s^27p^2`. The OUTERMOST SHELL is 7 and hence the element belongs to seventh period. Group = 10 + VALENCE electrons. So it belongs to group 14 (p block).

Discussion

5.	In terms of ionization enthalpy and electron gain enthaply , what type of atoms combine to form an ionic compound ?
Answer» SOLUTION :METAL atom with low IONIZATION enthalpy and a non-metal atom with HIGH electrongain enthalpy

Discussion

6.	In terms of period & group where would you locate the element with Z = 114.
Answer» Solution :Z = 114 which is situated between 86 nad 118. ` :. ` Its PERIOD = 7 . If `Z = 114 `, its Group is 14. ELECTRONIC Configuration : `[RN]^(86)5f^(14)6d^(10)7s^(2)7p^(2)` Last`e^(-) ` is in 7p `:. ` It is P-Block element. `{:(-,6d" contain ",10),(-,7s" contain ",2),(-,7p" contain ",2),(,,bar(14)):}` `:. ` It is PRESENT in `14^(TH)` Group.

Discussion

7.	In termsof periodand groupwherewouldyou locatethe elementwith Z = 114 ?
Answer» <P> Solution :The filling of the6th periodends at `._(86)Rn.` Thereafterthe fillingof 7thperiod.Likein 6thperiod in 7thperiodalso, the fillingof foursubshellsi.e.,`7s , 7p , 6d` and5foccurs . Butaccordingto aufbau principletheirenergiesincreasein the order: `7 s lt 5 f lt 6 d lt 7 p`. thereforeafter`._(86) Rn` the nexttwo ELEMENTSWITH Z=87 andZ = 88are s- blockelementsthe nextfourteen, i.e.,Z =90- 103aref- blockelementstne nextteni.e, z= 89and z= 104- 112are d- blockelements and thelastsixi.e.,Z= 113-118are p- blockelements. Therforethe elementsz= 114is thesecondp- blockelement (i.e.,group14)of the 7TH period. Thusthe location of theelementwith Z=114in theperiodtable is Period=7 thBlock: p- BlockGroup: 14 Ifofficialname isFlerovium ANDIT symbol isFl .

Discussion

8.	In terms of period and group, where would you locate the element with Z = 114.
Answer» ANSWER :7TH PERIOD and GROUP 14

Discussion

9.	In terms of intermolecular forces, explain why do some substances exist as solids?
Answer» Solution :When the constituent PARTICLES of a substance are so closely PACKED that the INTERMOLECULAR forces of ATTRACTION are much stronger than the thermal ENERGY, the substance exists as a solid.

Discussion

10.	In terms of dielectric properties, barium titanate is _____
Answer» ANSWER :FERROELECTRIC

Discussion

11.	In terms of ionisation enthalpy and electron gain enthalpy.
Answer» SOLUTION :Metal ATOM with LOW ionisation ENTHALPY and a non-metal atom with HIGH electron-gain enthalpy:

Discussion

12.	Interms ofelectronic configurationwhat theelementof a givenperiodand agrouphave incommon ?
Answer» Solution :For elementin a period the numberof shellsis EQUAL and forelementswithina GROUP thenumber ofelectronsin the outermost shell( valenceshell ) is THESAME.

Discussion

13.	In terms ofelectronic configuration what does elements of given period and a group have in common?
Answer» SOLUTION :In a PERIOD , all elements have equal number of shells. In a GROUP , all elements have equal number of electrons in the OUTERMOST shell.

Discussion

14.	In terms of critical constants, the compressibility factor is
Answer» <P>`(3)/(8)` `(8)/(3)` `(3)/(4)` `(2)/(3)` Solution :`P_(c )V_(c )=(3)/(8)RT_(c ) :. z=(P_(c )V_(c ))/(RT_(c ))=(3)/(8)`

Discussion

15.	In terms of Charle's law explain why b-273^(@)C is the lowest possible. Temperature.
Answer» Solution :CHARLES Lawplottedgraphically with volume against TEMPERATURE in `-273^(@)C`. Charles concluded that all GASES at this temperature could have zero and below this temperature volume would be negatie. It SHOW `-273^(@)C` is lowest temperature attainable.

Discussion

16.	In terms of Charles' law explain why -273^(@)C is the lowest temperature.
Answer» SOLUTION :At `-273^(@)C`, VOLUME of the gas BECOMES EQUAL to zero, i.e., the gas CEASES to exist.

Discussion

17.	In terms of Charles. law explain why -273^(@)C is the lowest possible temperature.
Answer» Solution :Eq. of Charle.s : `V_(t)=V_(0)((273.15+t)/(273.15))`….(Eq.-i) Put `t=-273/15^(@)C` in above equation. `THEREFORE V_(t)=V_(0)((273.15-273.5)/(273.15))` `therefore V_(t)=V_(0)((0)/(273.15))` `therefore V_(t)=0=V_(-273.15)` Therefore the VOLUME BECOME zero at the temperature `- 273.15^(@)C`. Actually all the GASES liquifies before reaching such low absolute `(-273.15^(@)C)` temperature and this is the least probable temperature. At this `- 273.15^(@)C` temperature the volume of the gases is zero and it is called absolute zero.

Discussion

18.	In terms of Charles' law explain why -273^@C is the lowest possible temperature?
Answer» Solution :At `-273^@C`, VOLUME of a gas reduces to ZERO. If the temperature is lowered further, a NEGATIVE VALUE of volume is obtained which MAKES no sense. For details, see the text.

Discussion

19.	In terms of band theory, what is the difference (i) between a conductor and an insulator ?(ii ) between a conductor and a semiconductor ?
Answer» Solution :(i)The ENERGY gap between the VALENCE band and conduction band in an insulator is very large whereas in a conductor, the energy gap is very small or there is OVERLAPPING between Valence band and conduction band. (II) In conductor, there is very small energy gap or there is overlapping between valence band and conduction band but in a semiconductor, there is always a small energy gap between them

Discussion

20.	In terms of band theory , what is the differnec (i)Between a conductor and an insulator. (ii)betweena conductor and a semicondutor?
Answer» Solution : (i) The energy GAP betweeen the valence BAND and conduction band in an INSULATION is very large wheras in a conductor , the energy gap is very small or there is overlapping between valance band and conduction band. (II)In aconductor, there is very small, energy gap or there is overlappingbetween valance band and conduction band but in a SEMICONDUCTOR, there is always a small energy between them.

Discussion

21.	In synthesis of which compound, the water gas is used ?
Answer» Solution :WATER GAS is USED in SYNTHESIS of `CH_3OH` (methanol).

Discussion

22.	In Swarts reaction, chloroalkane is converted to ………………… .
Answer» SOLUTION :Fluoroalkane

Discussion

23.	In sulphur estimation, 3.2 grams of an organic compound give 2.33 grams of BaSO_4 . Then the percentage of sulphur in the organic compound is
Answer» 0.15 0.1 0.2 0.25 Answer :B

Discussion

24.	In sulphur estimation, 0.157 g of an organic compound gives 0.4813 g of barium sulphate. The percentage of sulphur in the compound, is
Answer» `42.10` `52.10` `21.05` `40.01` Solution :MOLECULAR mass of `BaSO_(4)=138 +32+64 = 233` G 23 g of `BaSO_(4)` CONTAINS 32 g of sulphur `:. 0.4813 g` of `BaSO_(4)` will contain `=(32 xx 0.4813)/(233)` g of sulphur `%` of `S=(32 xx 0.4813xx100)/(233xx0.157)=42.10`.

Discussion

25.	In sulphur estimation, 0.157 g of an organic compound gave 0.4813g of barium sulphate. What is the percentage of sulphur in the compound ?
Answer» Solution :233g `BaSO_(4)` contain 32G sulphur `0.4813g BaSO_(4)` contain `(32 xx 0.4813)/(233)G` sulphur `:.` % of sulphur `= (32 xx 0.4813 xx 100)/(233 xx 0.157) = 42.10`

Discussion

26.	In Sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. What is the percentage of sulphur in the compound ?
Answer» SOLUTION :Here, mass of the SUBSTANCE taken = 0.157 g MAS of `BaSO_(4)` ppt. formed = 0.4813 g Now,1 mole of `BaSO_(4) -= 1 g` atom of S or (137 + 32 + 64) = 233 g of `BaSO_(4) -= 32 g` of S i.e., 233 g of `BaSO_(4)` contain sulphur = 32 g `:.` 0.4813 g of `BaSO_(4)` will contain sulphur `= (32)/(233) xx 0.4813 g` `:.` % age of sulphur in the compound `= (32)/(233) xx (0.4813)/(0.157) xx 100 = 42.10`

Discussion

27.	In sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. What is the percentage of sulphur in the compound ? (Ba = 136, S= 32, O= 16)
Answer» SOLUTION :molar mass of `BaSO_(4) = Ba + S + 4(O)` `= 137 + 32 + 64` = 233g `underset(32g)(S ) overset(NHO_(3))RARR H_(2)SO_(4) overset(BaCl_(2))rarr underset(233g)(BaSO_(4))` `:. 233g BaSO_(4)` contain 32g sulphur 0.4813g `BaSO_(4)` contain mass of sulphur `= (32 xx 0.4813)/(233)gm` %S `= (32)/(233) xx (0.4813)/(0.157) xx 100` = 42.10%

Discussion

28.	In sucrose, the glycosidic linkage is
Answer» `ALPHA` 1:4 LINKAGE `alpha` 1:6 linkage both `alpha` 1:4 linkage and `alpha` 1:6 linkage `alpha` 1:2 linkage Solution :SUCROSE CONTAINS `alpha` 1:2 GLYCOSIDE linkage.

Discussion

29.	In steam distillation the equation of total vapour pressure is P= p_(1) + p_(2) where p_(1) is more than……
Answer» <P> SOLUTION :VAPOUR PRESSURE of water `p_(2)`

Discussion

30.	In steam distillation, the vapour pressure of the volatile organic compound is
Answer» EQUAL to ATMOSPHERIC pressure Less than the atmospheric pressure Morethan the atmospheric pressure Just DOUBLE the atmospheric pressure Answer :B

Discussion

31.	In steam distillation of toluene, the pressure of toluene in vapour is
Answer» EQUAL to pressure of barometer less than pressure of barometer equal to vapour pressure of toluene in SIMPLE distillation more than the vapour pressure of toluene in simple distillation Answer :B

Discussion

32.	In steam distillation: (i) The liquid is boiled at low temperature. (ii) Vapour pressure of liquid lt Atmospheric pressure (iii) (liquid + pressure of water vapour)=1 atmosphere. (iv) The mixture of organic liquid are obtained. (v) The condensation of mixture of (vapour of water + vapour of lliquid)
Answer» SOLUTION :(i-T), (ii-T), (iii-F), (iv-F), (v-T)

Discussion

33.	In standard state the non spontaneous reaction among the following is
Answer» Melting of ice Natural radioactivity Freezing of water Rusting of iron Solution :WAT does not FREEZE spontaneously at `25^(@)C`

Discussion

34.	In sphalerite structure C.N. of cation and anion are respectively
Answer» 6, 6 8, 4 4, 4 8, 8 SOLUTION :Sphalerite is ZNS, in which both `ZN^(2+) and S^(2-)`has a C.N. of 4 each.

Discussion

35.	In sommerfeld's modification of Bohr's theory , the trajectory of an electron in a hydrogen atom is
Answer» A PERFECT ELLIPSE A CLOSED ellipse like curve, narrower at the perihelion position and flatter at the aphelion position A closed LOOP ona spherical surface A rosette Answer :B

Discussion

36.	In spectral series of hydrogen , the series which does not come in infrared region is
Answer» Pfund Brackett paschen LYMAN Solution :Lyman SERIES LIES in the ULTRAVIOLET REGION

Discussion

37.	In Sommerfeld's modification of Bohr's theory, the trajectory of an electron in a hydrogen atom is:
Answer» PERFECT ellipse a closed ellipse like CURVE, narrower at the PERIHELION POSITION and flatter at the APHELION positron a closed loop on spherical surface a rosette Answer :C

Discussion

38.	In some ofthe reactions,thallium resembles aluminum, whereasin other it resembleswith group I mentals. Supportthis statement by givingsome evidences.
Answer» Solution :Aluminium shows a uniformoxidation`+3`.Like aluminium, Tl ALSO shows +3 oxidationstate is some of its compoundslike `TiCl_(3), Tl_(2)O_(3)` ETC. Like `Al, Tl` alsoforms octahedral complexes : `[AlFe_(6)]^(3-)`and `[TlF_(6)]^(3-)` Group 1 metalsshows an oxidationstate of +1. Like group 1 METALS. Tl due to inert pair effect also shows +1 oxidationstate insome of its compounds such as `Tl_(2)O, TlCl, TlClO_(4)`, etc. Like group 1 oxides, `Tl_(2)O` is strongly BASIC.

Discussion

39.	In some of the reactions thallium resembles aluminium, whereas in others it resembles with group-I metals. Support this statement by giving some evidences.
Answer» Solution :Thallium belongs to GROUP 13 of the periodic table. The most COMMON oxidation state for this group is +3. HOWEVER, heavier members of this group also display the +1 oxidation state. This happens because of the inert pair effect. Aluminium displays the +3 oxidation state and ALKALI metals display the +1 oxidation state. Thallium displays both the oxidation states. THEREFORE, it resembles both aluminium and alkali metals. Thallium, like aluminium, forms compounds such as `TlCl_3` and `Tl_2O_3`. It resembles alkali metals in compounds `Tl_2O` and TlCl.

Discussion

40.	In some of the reactions thallium resembles aluminium, whereas in others it resembles with group I metals. Support this statement by giving some evidences.
Answer» Solution :Similar to aluminium, thallium shows +3 oxidation STATE in compounds like `Tl_2 O_3, TlCl_3, Tl_2 (SO_4)_3`, ETC. It FORMS complex `[TIF_6]^(3-)` similar to that formed by aluminium,`[AlF_6]^(2-)` Due to inert-pair effect, it also exhibits oxidation state of +1 as exhibited by ALKALI metals of group 1. Some of its compounds formed in this state are `Tl_2 O , TlCl` etc., which are similar to the compounds like `Na_2 O, NACL` etc. Like `Na_2 O, Tl_2 O` is strongly basic. Thus, it resembles group 1 metals also.

Discussion

41.	in solvolysis of 1,2-dimrhtyl propyl-p-toluene sulfonate in acidic acid at 75^(@)C, How many (alkene +Substition ) products will be formed ?
Answer» 2 3 4 5 Solution :

Discussion

42.	In Solvay's ammonia soda process for the manufacture of washing soda which of the following does not happen
Answer» The raw material recyled is ammonia The by product is calcium chloride The intermediate compounds formed are ammonia hydrogen CARBONATE and SODIUM hydrogen carbonate FORMATION of ammonia hydrogen carbonate by the reaction of `NH_(3), H_(2)O` and `CO_(2)` is redox reaction . ANSWER :D

Discussion

43.	In Solvay's process NaHCO_(3) separates out due to
Answer» high lattice energy high solubility common ion EFFECT less solubility of `Na_(2)CO_(3)` Answer :C

Discussion

44.	In solvay process when ammonical brine is saturated with CO_(2) gas the product formed is
Answer» `NH_(4)HCO_(3)` `(NH_(4))_(2)CO_(3)` `NaHCO_(3)` `Na_(2)CO_(3)` ANSWER :C

Discussion

45.	In solid ice, oxygen atom is surrounded
Answer» tetrahedrally by 4 hydrogen ATOMS octahedrally by 2 OXYGEN and 4 hydrogen atoms tetrahedrally by 2 hydrogen und 2 oxygen atoms octahedrally by 6 hydrogen atoms Answer :a

Discussion

46.	In solid hydrogen, the intermolecular bonding is
Answer» Ionic vand der WAAL's Metallic Covalent Solution :The CORRECT order of BOILING POINTS is `H_(2)O_(2) gt D_(2) gt H_(2)`

Discussion

47.	In solid conundrum the number of oxygen atoms coordinate to aluminium ion is
Answer» Solution :In solid corandum 6-oxygen ATOMS COORDINATE to ALUMINIUM ION.

Discussion

48.	In solid argon, the atoms are held together by
Answer» Ionic bonds HYDROGEN bonds VANDER WAAL forces Hydrophobic forces ANSWER :C

Discussion

49.	In solid state Ar atoms are held together by
Answer» IONIC bonds Hydrogen bonds vander WAAL FORCES HYDROPHOBIC forces Answer :C

Discussion

50.	In sodium fusion test of organic compounds, the nitrogen in an organic compound is converted inot :
Answer» Soda lime sodium cyanide Sodium nitrite Sodium nitrate Solution :`Na+C+N OVERSET("FUSION")(RARR) NaCN`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In th eLassaigne's test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:

In terms of work, the decrease in free energy during aprocess is equal to "…................"

In terms of rate constants for forward and backward reactions (k_(f) and k_(b)) , equilibrium constant of a reaction is equal to …………. .

In terms of period and groups where would you locate the element with Z = 114 ?

In terms of ionization enthalpy and electron gain enthaply , what type of atoms combine to form an ionic compound ?

In terms of period & group where would you locate the element with Z = 114.

In termsof periodand groupwherewouldyou locatethe elementwith Z = 114 ?

In terms of period and group, where would you locate the element with Z = 114.

In terms of intermolecular forces, explain why do some substances exist as solids?

In terms of dielectric properties, barium titanate is _____

In terms of ionisation enthalpy and electron gain enthalpy.

Interms ofelectronic configurationwhat theelementof a givenperiodand agrouphave incommon ?

In terms ofelectronic configuration what does elements of given period and a group have in common?

In terms of critical constants, the compressibility factor is

In terms of Charle's law explain why b-273^(@)C is the lowest possible. Temperature.

In terms of Charles' law explain why -273^(@)C is the lowest temperature.

In terms of Charles. law explain why -273^(@)C is the lowest possible temperature.

In terms of Charles' law explain why -273^@C is the lowest possible temperature?

In terms of band theory, what is the difference (i) between a conductor and an insulator ?(ii ) between a conductor and a semiconductor ?

In terms of band theory , what is the differnec (i)Between a conductor and an insulator. (ii)betweena conductor and a semicondutor?

In synthesis of which compound, the water gas is used ?

In Swarts reaction, chloroalkane is converted to ………………… .

In sulphur estimation, 3.2 grams of an organic compound give 2.33 grams of BaSO_4 . Then the percentage of sulphur in the organic compound is

In sulphur estimation, 0.157 g of an organic compound gives 0.4813 g of barium sulphate. The percentage of sulphur in the compound, is

In sulphur estimation, 0.157 g of an organic compound gave 0.4813g of barium sulphate. What is the percentage of sulphur in the compound ?

In Sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. What is the percentage of sulphur in the compound ?

In sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. What is the percentage of sulphur in the compound ? (Ba = 136, S= 32, O= 16)

In sucrose, the glycosidic linkage is

In steam distillation the equation of total vapour pressure is P= p_(1) + p_(2) where p_(1) is more than……

In steam distillation, the vapour pressure of the volatile organic compound is

In steam distillation of toluene, the pressure of toluene in vapour is

In standard state the non spontaneous reaction among the following is

In sphalerite structure C.N. of cation and anion are respectively

In sommerfeld's modification of Bohr's theory , the trajectory of an electron in a hydrogen atom is

In spectral series of hydrogen , the series which does not come in infrared region is

In Sommerfeld's modification of Bohr's theory, the trajectory of an electron in a hydrogen atom is:

In some ofthe reactions,thallium resembles aluminum, whereasin other it resembleswith group I mentals. Supportthis statement by givingsome evidences.

In some of the reactions thallium resembles aluminium, whereas in others it resembles with group-I metals. Support this statement by giving some evidences.

In some of the reactions thallium resembles aluminium, whereas in others it resembles with group I metals. Support this statement by giving some evidences.

in solvolysis of 1,2-dimrhtyl propyl-p-toluene sulfonate in acidic acid at 75^(@)C, How many (alkene +Substition ) products will be formed ?

In Solvay's ammonia soda process for the manufacture of washing soda which of the following does not happen

In Solvay's process NaHCO_(3) separates out due to

In solvay process when ammonical brine is saturated with CO_(2) gas the product formed is

In solid ice, oxygen atom is surrounded

In solid hydrogen, the intermolecular bonding is

In solid conundrum the number of oxygen atoms coordinate to aluminium ion is

In solid argon, the atoms are held together by

In solid state Ar atoms are held together by

In sodium fusion test of organic compounds, the nitrogen in an organic compound is converted inot :