52671 + Interview Questions in Chemistry in Class 11

1.	In order that a compound may show geometrical isomerism A Compound must have a chiral carbon (B) Each of the two doubly bonded carbon atoms must have different atoms or groups (C ) Compound must have a plane of symmetry
Answer» only A only B only C None ANSWER :B

Discussion

2.	In order of decreasing contribution to the green house effect, the three main gases are _____, __________ and ______
Answer» ANSWER :`CO_2 (50%) , CH_4 (19%) , CFC(17%)`

Discussion

3.	In open vessel sugar solution hArr "sugar"_((s)) which information is obtained in this reaction ?
Answer» SOLUTION :Here saturated solution of SUGAR is given. So at given equilibrium is ESTABLISHED between SOLID sugar and dissolve sugar.

Discussion

4.	In one organic compound the weight proportion of C, H and N is 9 : 1 :3.5respectivily. Its molecular mass is 108 mg/mole. Find the molecular formula.
Answer» Answer :`C_(6)H_(8)N_(2)`

Discussion

5.	In one organic compound the proportion of C, H & Cl is 10%, 0.84% and 89.2 % respectively.Its empirical formula is.....
Answer» `C Cl_(4)` `CHCl_(3)` `CH_(3)CL` `CH_(2)Cl_(2)` Solution :`C:H:Cl=(10)/(12):(0.84)/(1) : (89.2)/(35.5)` `=0.83:0.84:2.51` `= (0.83)/(0.83) : (0.84)/(0.83) : (2.51)/(0.83)` `= 1:1:3` `:.CHCl_(3)`

Discussion

6.	In one organic compound percentage of C& H are 54.55 and 9.06. What will be its epirical formula.
Answer» ANSWER :`C_(2)H_(4)O`

Discussion

7.	In one of the following compounds, the oxidation number of sulphur is not a whole numbers
Answer» `Na_(2)S_(4)O_(6)` `H_(2)SO_(5)` `H_(2)SO_(4)` `Na_(2)S_(2)O_(3)` SOLUTION :In `Na_(2)OVERSET(+2.5)(S_(4)O_(6)), 'S' O.S = +2.5`

Discussion

8.	In one experiment, certain amount of NH_(4)I(s) was heated rapidly in a closed container at 375^(@)C. The following equilibrium was established: NH_(4)I(s)hArrNH_(3)(g)+HI(g) Excess of NH_(4)I(s) remained unreacted in the flask and equilibrium pressure was 304mm of Hg. After some time, the pressure started increasing further owing to the dissociation of HI. 2HI(g)hArrH_(2)(g)+l_(2)(g) K_(C)=0.010 calculate final pressure.
Answer» `331mm "of" HG` `335mm "of" Hg` `662mm "of" Hg` `151 MM "of" Hg` SOLUTION :N//A

Discussion

9.	In one discharge tube, H_(2) gas is taken and in the other O_(2) gas is taken. Will the electrons an positive ions in the cathode rays and in the anode rays be same or different ?
Answer» SOLUTION :ELECTRONS will be same but POSITIVE IONS will not be same

Discussion

10.	In one compound 54.55 % C, 9.09 % H and 36.36 % O are present. Its empirical formula is.....
Answer» `C_(3)H_(5)O` `C_(4)H_(8)O_(2)` `C_(2)H_(4)O_(2)` `C_(2)H_(4)O` Answer :B::C::D

Discussion

11.	In oil fire extinguisher, the compound used pyrene is chemically ………………. .
Answer» SOLUTION :`C Cl_4`

Discussion

12.	In OF_(2) ,number of bond pairs and lone of electrons are respectively
Answer» `2,0` `2,8` `2,10` ` 2, 9 ` SOLUTION :

Discussion

13.	In O_(2) molecule, the correct order of molecular orbitals is
Answer» `PI2 pygt pi2 pz` `pi 2 PY ^() = pi2pz` `sigma 2s LT sigma 2s^()` `sigma 2s ^()gt sigma2px ^()` Answer :C

Discussion

14.	In O_(2), H_(2)O_(2) and O_(3) the correct order of oxygen -oxygen bond length is
Answer» `O_(2)gtO_(3)gtH_(2)O_(2)` `O_(3)gtH_(2)O_(2)gtO_(2)` `H_(2)O_(2)gtO_(3)gtO_(2)` `O_(2)gtH_(2)O_(2)gtO_(3)` Answer :C

Discussion

15.	In O_(2)^(-) and O_(2)^(2-) which has more bond order ?
Answer» SOLUTION :`O_(2)^(-) (1.5) and O_(2)^(2-) ` (1.0) THEREFORE BOND ORDER in `O_(2)^(-)`

Discussion

16.	In nuclear reactors, heavy water is used as a
Answer» Fuel Projectile Moderator Coolent Answer :C

Discussion

17.	In nuclear transmutation tritium is obtained from
Answer» `""_7N^14` `""_7C^14` `""_LI^6` `""_8O^16` ANSWER :C

Discussion

18.	In nomenclature of cyclic compound…… prefix is written before the name of simple chain containing alkane.
Answer» ANSWER :CYCLO

Discussion

19.	In NO_(3)^(-) ion, the number of bond pairs and lonepairs of electrons on nitrogen atom are
Answer» 2 ,2 3, 1 1, 3 4, 0 Solution :`NO_(3)^(-) = [underset(. .) overset(. . ) O= underset(. .) underset(":O:")underset(\|)N- underset(. .)overset(. . )O: ] ^(-)`, Bond PAIRS on N = 4, LONE pairs = 0

Discussion

20.	In NO_(3)^(-)ion, the number of bond pairs and lone pa1rs of electrons on nitrogen atom are
Answer» 2,2 3,1 1,3 4,0 Solution :4,0 In N-atom, are = 5 valence electrons = 5 As the presence of one negative charge, NUMBER of valence electrons = 5 + 1 = 6 one O-atom forms TWO bond (= bond) and two O-atom shared with two electrons of N-atom So, 3 O-atoms shared with 8 electrons of N-atom. `therefore `Number of bond PAIRS (or shared pairs) = 4 Number of lone pairs = 0

Discussion

21.	In {:(-NO_(2),-NH_(2),-SO_(3)H),(I,II,III):}, the decreasing order of -I effect is
Answer» `I GT II gt III` `I gt III gt II ` `III gt II gt I` `III gt I gt II ` SOLUTION :N/A

Discussion

22.	In nitric oxide (NO), the oxidation state of nitrogen is
Answer» `-2` `+1` `-1` `+2` SOLUTION :`NO,x-2=0impliesx=+2`

Discussion

23.	In nitration of benzene ……is electrophile.
Answer» NITRATE ions Nitrite ions Nitronium ions Nitro Answer :C

Discussion

24.	In neutralisation of KI by AgNO_(3) positive charge is due to adsorption of
Answer» `AG^(+)` ions Ag I ions Both (B) and (C) ANSWER :A

Discussion

25.	In nature, non metals are found in the
Answer» native STATE reduced form oxidised form form of alloys with metals. Solution :In nature , non-metals are found in native state `(N_2, O_2, `C ETC .), reduced form (`CH_4, H_2S, NH_3 etc .), oxidised form (`CO_2, H_(2)O` etc.)

Discussion

26.	In natue a decay chain sereis starts with ._(90)h^(232) and finally terminates at ._(82)Pb^(208). A throium ore sample was found to contain 8xx10^(-5) mL of He At STP and 5xx10^(7)g of Th^(232). Find the age of ore sample assuming that sourcesof He to be only due to decay of Th^(232) Also assumecomplete retention of He within the ore, t_(1//2) for Th^(232) = 1.39xx10^(10) year.
Answer» Solution :We KNOW, `._(90)Th^(232) rarr ``._(82)Pb^(208) + 6 ``._(2)He^(4) + 4 ``._(-1)e^(0)` `:' 6xx22400 mL` He is formed by `232g Th` decay `:. 8xx10^(-5) mL` He is formed by `= (232xx8xx10^(-5))/(6xx22400)g Th` decay `= 1.38xx10^(-7)g Th` decay At `t = t`, sample has `Th = 5xx10^(-7) g prop N` At `t = 0`, sample has `Th = 5xx10^(-7) + 1.385 xx 10^(-7) prop N_(0) = 6.38xx10^(-7)g` For `Th` decay `:' t = (2.303)/(LAMBDA) log_(10) (N_(0))/(N)` `= (2.303xx1.39xx10^(10))/(0.693) log_(10) (6.38xx10^(-7))/(5x10^(-7))` `=4.89xx10^(9)` year

Discussion

27.	In naturally available hydrogen, the percentage of tritium is
Answer» `99.986%` `0.014%` `7X10^(-16)%` `0.02%` ANSWER :C

Discussion

28.	In NaCl is doped with10^(-4) mol % ofScCl_(2) , the concentration of cation vacancies will be(N_(A) = 6.02 xx 10^(23) mol^(-1))
Answer» ` 6.02 xx 10^(14) mol^(-1)` `6.02 xx 10^(15) mol^(-1)` ` 6.02 xx 10^(16) mol^(-1)` ` 6.02 xx 10^(17)mol^(-1) ` Solution :For each ` Sr^(2+)`ion INTRODUCED, one catio vacancy is created because` 2 Na^(+)`ions are REMOVED and one vacant site is occupied by ` Sr^(2+)` . Doping with ` 10^(-4) "mol"%" of " SrCl_(2)`means 100 moles of NaCl are doped with ` 10^(-4)` mole of ` SrCl_(2)` `SrCl_(2)` doped per mole of NaCl = `10^(-4) //100` ` 10^(-6)` mole =`10^(-6) xx ( 6.02 xx 10^(23)) Sr^(2+)` ions ` = 6.02 xx 10^(17) Sr^(2+)` ions Hence, concetration of cation vacancies ` 6.02 xx 10^(17) "mol"^(-1)`

Discussion

29.	In NaCl crystals , Cl^- ions are in FCC arrangement. Calculate the number of Cl^- ions in its unit cell
Answer» SOLUTION :`Cl^-` ion per UNIT CELL =`8xx1/8` (from corners ) + `6xx1/2` (from face CENTRES)=4

Discussion

30.	In NaCl crystal, Ci^(-1) ions are I FCc arrangement, Calculate the number ofCl^(-)ions in its unit cell.
Answer» Solution :`CL^(-)` ION per unit CELL = ` 8 xx 1/8 "( from corners)" + 6 xx 1/2`( form face CENTRES ) = 4.

Discussion

31.	In NaCl, Cl^- ions are present in the _________ structure whereas Na^+ ions are present in the _______ voids.
Answer» ANSWER :FCC, OCTAHEDRAL

Discussion

32.	In Na and K metals, which salts are high proportion in the ash of shrubs ?
Answer» `PO_(4)^(3-)` `CO_(3)^(2-)` `NO_(3)^(1-)` `SO_(4)^(2-)` Answer :B

Discussion

33.	In mutarotation of alpha-D Glucose hArr beta-D Glucose equilibrium constant is 1.8. At equilibrium what will be the percentage of alpha-D Glucose ?
Answer» 35.8 64.3 55.6 44.4 Solution :`{:(,alpha-"D-GLUCOSE" hArr, BETA-"D-Glucose"),("INITIAL",1,0),("At EQUILIBRIUM" , 1-alpha,alpha):}` `K=alpha/(1-alpha)`=1.8 `alpha=1.8-1.8alpha` `therefore 2.8 alpha-1.8` `therefore alpha`=0.642 `therefore 1-alpha`=0.358 So, at the equilibrium of `alpha`-D Glucose =35.8%

Discussion

34.	In multi-electron atom, 4s - orbital is lower in energy than
Answer» 3D -orbital 3p - orbital 2s - orbital 2p - orbital Answer :A

Discussion

35.	In molecule, the formal charges of oxygen atoms 1,2,3 are respectively
Answer» `-1,0,+1` `0,-1,+1` `0,+1 ,-1` `+1,0,-1` ANSWER :D

Discussion

36.	In modern periodic table, if an element has electronic configuration 1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(4), then what will be the atomic number of element, which is just below the element in its group ?
Answer» 18 34 45 24 Solution :34 Electronic configuration of the element `1S^(2) 2s^(2) 2p^(6) 3s^(2) 3P^(4)` ` :. ` TOTAL electrons in it = 16 and Z = 16 Which INDICATES element is S(Z = 16) of`III^(rd)` Period, and`16^(th)` /VIB GROUP. Element just below S in same group is Se having atomic number 34.

Discussion

37.	In Millikan's oil drop experiment, we make use of:
Answer» OHM's law Ampere's law Stoke's law Faraday's law Answer :C

Discussion

38.	In Millikan's experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge in the oil drop is -1.282 xx 10^(-18)C, calculate the number of electrons present in it.
Answer» Solution :ELECTRONS present = `(-1.282 xx 10^(-18)C)/(-1.6022 xx 10^(-19)C) = 8`

Discussion

39.	in milikanexperimentstaticelectricchargeon theoildrops has beenobtainedby shiningX-raysif thestaticelectric chargeon theoildropis-1.282xx 10^(18) Ccalculatethe numberof electronpresencton it.
Answer» Solution :Staticelectricchargeon theoil drop(q ) =1.282 `XX 10^(18) C` Chargeon oneelectron(e ) = 1.6022 `xx 10^(19) C` NUMBEROF electron= `(q ) /( e )` `(1.282 xx 10^(18) C)/( 1.6022xx 10^(19) C)` 8.00

Discussion

40.	In [Mg(H_(2)O)_(6)]^(2+) Mg hybridiasationis
Answer» `d^(2)SP^(3)` `sp^(3)d^(2)` `dsp^(2)` `sp^(3)` Answer :1

Discussion

41.	In MgH_2oxidation number of hydrogen is:
Answer» `-1` `+1` `-2` `+2` Solution :`Mgoverset(-1)(H_2)` , In METALLIC HYBRIDES , oxidation state of HYDROGEN is -1.

Discussion

42.	In meta-aluminates, co-ordination number of aluminium is
Answer» 3 6 1 4 Solution :In meta-aluminates, co-ordinates number of aluminium is 6. `UNDERSET("Meta-aluminate ion")([AL(OH)_(4)(H_(2)O)_(2)]^(-))`

Discussion

43.	In melting of ice, which one of the conditions will be more favorable ?
Answer» HIGH TEMPERATURE and high PRESSURE LOW temperature and low pressure low temperature and high pressure high temperature and low pressure ANSWER :A

Discussion

44.	In measurement of BOD_x, is generally taken as
Answer» SOLUTION :We generally MEASURE `BOD_5` where 5 represents number of DAYS for which the sample is kept, i.e.amount of `O_2` consumed in 5 days

Discussion

45.	In long form of periodic table, an element has electronicconfiguration 1s^(2)2s^(2)2p^(6)3s^(2)3p^(3). Thus what will be the atomic number of element which is just below this element in its group ?
Answer» <P>23 16 33 47 Solution :Electronic CONFIGURATION is given as : `1S^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(3)` ` :. ` TOTAL electrons = 15 ` :. ` Element is P of group 15 or VB The element just below to P is As As has ATOMIC number = 33 and As is of group 15 or VB

Discussion

46.	In long form of periodic table, an elem ent has electronic configurationIs^(2) 2s^(22)p^(6)3s^(2)3p^(3) Thus what will be the atomic no. of elem ent ? Which is just below this elem ent in its group ?
Answer» 23 16 47 33 Solution :The GIVEN CONFIGURATION indicates Z = 15, and outerm ost configuration `3s^(2) 3p^(3)` ..... indicates group `15^(th) , row 3^(rd)therefore`Next row `4^(th)` and group `15^(th)` element will behaving Z = (15 + 18) = 33

Discussion

47.	In lithium aluminium hydride molecule,how many hydrogen atoms are present ?
Answer» SOLUTION :`LiAlH_4` It has FOUR HYDROGEN ATOMS

Discussion

48.	In Leibig's method 0.24 g of organic compound on combustion with dry oxygen produced of 0.62 g of CO_(2) and 0.11 g of H_(2)O. Determine the percentage composition of the compound.
Answer» SOLUTION :Mass of organic COMPOUND `=m=0.24g` Mass of carbon dioxide formed `=0.62 g` Mass of water formed `=0.11 g` Percentage of carbon `=12/4xx0.62/0.24xx100=70.45` Percentage of hydrogen `=2/4xx0.11/0.24xx100=5.09` Percentage of oxygen `=[100-(70.5+5.0)]=24.46`

Discussion

49.	In Lassaigne's test, when both N and S are present blood red colour is obtained. This is due to the formation of
Answer» FERRIC ferrocyanide ferric cyanide ferric thiocyanate ferric hydroxide. Solution :`Na + C + N+S to Na CNS` `Fe^(3+) SCN^(-) to [Fe (SCN)_3]` Ferric thiocyanate

Discussion

50.	In Lassaigne's test, thiourea is converted into
Answer» NACN `Na_(2)S` `Na_(2)SO` NaCNS Answer :D

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In order that a compound may show geometrical isomerism A Compound must have a chiral carbon (B) Each of the two doubly bonded carbon atoms must have different atoms or groups (C ) Compound must have a plane of symmetry

In order of decreasing contribution to the green house effect, the three main gases are _____, __________ and ______

In open vessel sugar solution hArr "sugar"_((s)) which information is obtained in this reaction ?

In one organic compound the weight proportion of C, H and N is 9 : 1 :3.5respectivily. Its molecular mass is 108 mg/mole. Find the molecular formula.

In one organic compound the proportion of C, H & Cl is 10%, 0.84% and 89.2 % respectively.Its empirical formula is.....

In one organic compound percentage of C& H are 54.55 and 9.06. What will be its epirical formula.

In one of the following compounds, the oxidation number of sulphur is not a whole numbers

In one discharge tube, H_(2) gas is taken and in the other O_(2) gas is taken. Will the electrons an positive ions in the cathode rays and in the anode rays be same or different ?

In one compound 54.55 % C, 9.09 % H and 36.36 % O are present. Its empirical formula is.....

In oil fire extinguisher, the compound used pyrene is chemically ………………. .

In OF_(2) ,number of bond pairs and lone of electrons are respectively

In O_(2) molecule, the correct order of molecular orbitals is

In O_(2), H_(2)O_(2) and O_(3) the correct order of oxygen -oxygen bond length is

In O_(2)^(-) and O_(2)^(2-) which has more bond order ?

In nuclear reactors, heavy water is used as a

In nuclear transmutation tritium is obtained from

In nomenclature of cyclic compound…… prefix is written before the name of simple chain containing alkane.

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

In NO_(3)^(-)ion, the number of bond pairs and lone pa1rs of electrons on nitrogen atom are

In {:(-NO_(2),-NH_(2),-SO_(3)H),(I,II,III):}, the decreasing order of -I effect is

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

In nitration of benzene ……is electrophile.

In neutralisation of KI by AgNO_(3) positive charge is due to adsorption of

In nature, non metals are found in the

In naturally available hydrogen, the percentage of tritium is

In NaCl is doped with10^(-4) mol % ofScCl_(2) , the concentration of cation vacancies will be(N_(A) = 6.02 xx 10^(23) mol^(-1))

In NaCl crystals , Cl^- ions are in FCC arrangement. Calculate the number of Cl^- ions in its unit cell

In NaCl crystal, Ci^(-1) ions are I FCc arrangement, Calculate the number ofCl^(-)ions in its unit cell.

In NaCl, Cl^- ions are present in the _________ structure whereas Na^+ ions are present in the _______ voids.

In Na and K metals, which salts are high proportion in the ash of shrubs ?

In mutarotation of alpha-D Glucose hArr beta-D Glucose equilibrium constant is 1.8. At equilibrium what will be the percentage of alpha-D Glucose ?

In multi-electron atom, 4s - orbital is lower in energy than

In molecule, the formal charges of oxygen atoms 1,2,3 are respectively

In modern periodic table, if an element has electronic configuration 1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(4), then what will be the atomic number of element, which is just below the element in its group ?

In Millikan's oil drop experiment, we make use of:

In Millikan's experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge in the oil drop is -1.282 xx 10^(-18)C, calculate the number of electrons present in it.

in milikanexperimentstaticelectricchargeon theoildrops has beenobtainedby shiningX-raysif thestaticelectric chargeon theoildropis-1.282xx 10^(18) Ccalculatethe numberof electronpresencton it.

In [Mg(H_(2)O)_(6)]^(2+) Mg hybridiasationis

In MgH_2oxidation number of hydrogen is:

In meta-aluminates, co-ordination number of aluminium is

In melting of ice, which one of the conditions will be more favorable ?

In measurement of BOD_x, is generally taken as

In long form of periodic table, an element has electronicconfiguration 1s^(2)2s^(2)2p^(6)3s^(2)3p^(3). Thus what will be the atomic number of element which is just below this element in its group ?

In long form of periodic table, an elem ent has electronic configurationIs^(2) 2s^(22)p^(6)3s^(2)3p^(3) Thus what will be the atomic no. of elem ent ? Which is just below this elem ent in its group ?

In lithium aluminium hydride molecule,how many hydrogen atoms are present ?

In Leibig's method 0.24 g of organic compound on combustion with dry oxygen produced of 0.62 g of CO_(2) and 0.11 g of H_(2)O. Determine the percentage composition of the compound.

In Lassaigne's test, when both N and S are present blood red colour is obtained. This is due to the formation of

In Lassaigne's test, thiourea is converted into

In order of decreasing contribution to the green house effect, the three main gases are _, and

In NaCl, Cl^- ions are present in the ___ structure whereas Na^+ ions are present in the _ voids.