52671 + Interview Questions in Chemistry in Class 11

1.	Electron affinity of oxygen is less negative than sulphur. Justify this statement.
Answer» Solution :When an electron is added to oxygen, the added electron goes to the .L. SHELL (n=2). As the .L. shell POSSESS smaller region of space, the added electron feels SIGNIFICANT repulsion from the other ELECTRONS present in this level. E.A of O=-141 KJ `mol e^(-1)` E.A of S=-200 KJ `mol e^(-1)`.

Discussion

2.	Electron affinity of Fluorine is less than that of Chlorine because
Answer» Electronegativity of Fluorine is more 2p SUB shell of F is smaller Chlorine is a STRONGER oxidant BOND dissociation energy of `F_2` is less Answer :B

Discussion

3.	Electron affinity of chlorine is more than that of fluorine explain.
Answer» ANSWER :DUE to small SIZE fluorine REPELS the incoming ELECTRON

Discussion

4.	Electronaffinityis positivewhen
Answer» O changesinto `O^(-)` `O^(-)`changesinto `O^(2-)` O changesinto `O^(+)` electronaffinityis alwaysnegative Solution :Sinceelectronaffinityis negative of electrongain enthalpythereforeelectronaffinity is + vewhenO CHANGES to`O^(-)`i.e.,OPTION(a) is CORRECT.

Discussion

5.	Electron affinity is measured in
Answer» No UNITS `"kcal MOL"^(-1)` `"kJ mol"^(-1)` Both (2) and (3) Answer :D

Discussion

6.	Electron affinity is
Answer» Energy required to TAKE out an ELECTRON from an ISOLATED gaseous atom The tendency of an atom to attract an electron towards itself Energy absorbed when an electron is a~o an isolated atom in gaseous state Energy RELEASED when an electron is ADDED to nn isolated atom in the gaseous state Answer :D

Discussion

7.	Electromnn - defcienent hydroride is/are
Answer» `BH_(3)` `AlH_(3)` `BeH_(2)` All Answer :4

Discussion

8.	Electromeric effect is a temporary effect. Assign reason.
Answer» Solution :The ELECTROMERIC effect is noticed in the organic compounds containing multiple bond i.e., DOUBLE bond `( gt C=C lt` or `gt C=O)` or triple blood `(-C equiv N)` under the influence of the attacking reagent. The moment the attacking reagent is REMOVED, pi `(pi)` electron pair comes BACK to its original position forming multiple bond again. Therefore, electromeric effect is a temporary effect. for details, consult section 12.22.

Discussion

9.	Electromagnetic radiationof wavelength242nm isjustsufficientto ionise thesodiumatom .Calculatethe ionisation energyofsodiumin Kj mol^(-1)
Answer» Solution :where `lambda= 242nm =242 xx 10^(9) m`wavelengthper photon`E= (hc )/(lambda ) ` permoleE = `(N_(A) hc )/(lambda )` `n=6.626 xx 10^(34)Js` `c=3.0xx 10^(8) m` `N_(A)= 6.022xx 10^(23)` permole `=(6.022 xx 10^(23) mol^(1)xx 6.626 xx 10^(34)js xx3.0 xx 10^(8) MS^(-1)J)/( (242 xx 10^(9) m))` `=494.7 xx KJ mol^(-1)495kJ mol^(1)` Ionisationenthalpy=495kJ `mol^(1)`

Discussion

10.	Electromeric effect involves the complete transfer of
Answer» `sigma `-ELECTRON `PI`-electron proton both ` sigma" and " pi ` electrons Solution :N/A

Discussion

11.	Electromeric effect can be relayed in
Answer» CARBON chain joined by SINGLE bond carbon chain joined by double bond carbon chain joined by triple bond conjugated SYSTEM ANSWER :D

Discussion

12.	Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy of sodium in kJ mol^(-1)
Answer» SOLUTION :`E = N hv = Nh (C)/(lamda) = ((6.02 xx 10^(23) mol^(-1)) xx (6.626 xx 10^(-34) JS) xx (3 xx 10^(8) ms^(-1)))/(242 xx 10^(-9) m)` `= 4.945 xx 10^(5) J mol^(-1) = 494.5 kJ mol^(-1)`

Discussion

13.	Electromagnetic radiation with minimum wavelength is
Answer» ULTRA violet Radio wave X-ray Infra red Answer :C

Discussion

14.	Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out
Answer» In the PRESENCE of `NaCl` In the presence of fluorite In the presence of cryolite which forms a MELT lower melting temperatures In the presence of cryolite which forms a melt with high melting temperature. Solution :Electrolytic reduction iof ALUMINA `(Al_(2)O_(3))` to ALUMINIUM by Hall-Heroult, cryolite which forms a melt lower melting temperature.

Discussion

15.	Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H_(2)O_(2) The number of peroxybonds present in X and Y. Then x + y is?
Answer» SOLUTION :`X = H_2SO_4, Y = H_2S_2O_8`

Discussion

16.	Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H_(2)O_(2). The number of peroxy (O-O_ bonds present in X and Y respectively, are
Answer» 1,1 1,2 0,1 0,0 Answer :C

Discussion

17.	Electrolysis of potassium salt of 3-methyl butanoic acid gives an alkane ‘A’. The name of alkylIodide which gives same alkane on treatment with sodium metal in dry ether solvent is
Answer» 1-Iodo-3-methyl butane Isobutyl IODIDE Neopentyl iodide It can't be PREPARED by wurtz reaction Solution :Alkanes properties

Discussion

18.	Electrolysis of molten saline hydride generally gives
Answer» HYDROGEN at CATHODE hydrogen at ANODE OXYGEN at cathode oxygen at anode Answer :B

Discussion

19.	Electrolysis of KCl. MgCl_2 . 6H_2O gives: potassium only magnesium only magnesium and chlorine potassium and magnesium.
Answer» POTASSIUM only MAGNESIUM only magnesium and CHLORINE potassium and magnesium. Solution :magnesium and chlorine

Discussion

20.	Electrolysis of aqueous solution of sodium salt of Maleic acid and Fumaric acid gives
Answer» Ethylene and acetylene respectively Acetylene and ethylene respectively Ethylene and Ethane respectively Ethyne in both the CASES Solution :In both the cases ethyne is FORMED. Ethylene is formed by the ELECTROLYSIS of sodium salt of Succinic ACID, while ethane is formed by the electrolysis of sodium ACETATE.

Discussion

21.	Electrolysis of aqueous solution of CH_(3)COOK gives
Answer» `CH_(4)` `C_(2)H_(4)` `C_(2)H_(6)` `C_(2)H_(2)` Solution :`2CH_(3)COOK + 2H_(2)O overset("Electrolysis")RARR H_(3)C - CH_(3) + 2NaOH + 2CO_(2) + H_(2)O`

Discussion

22.	Electrolysis of aqueous solution of ammonium sulphate and sulphuric acid at anode gives
Answer» `H_2S_2O_8` `(NH_4)_2S_2O_8` `H_2O_2` `H_2` ANSWER :B

Discussion

23.	Electrolysis of an aqueous solution of potassium acetate, the hydrocarbon obtained
Answer» Methane ETHANE Propane A MIXTURE of the above three ALKANES Solution :Kolbe.s REACTION.

Discussion

24.	Electrolysis of a concentrated aqueous solution of a compound gave C_2H_6 on anode.The compound is
Answer» `CH_3COOK` `CH_3CH_2COOK` `CH_3COOC_2H_5` `CH_3OCH_3` SOLUTION :`2CH_3COOK+2H_2Ooverset"ELECTROLYSIS"to ubrace(CH_3-CH_3+2CO_2)_"ANODE"+ubrace(2KOH+H_2)_"CATHODE"`

Discussion

25.	Electrolysis of 50% H_(2)SO_(4) produces
Answer» `H_(2)S_(2)O_(8)` at ANODE `H_(2)SO_(4)` at anode `H_(2)SO_(5)` at cathode `H_(2)O_(2)` at anode Answer :A

Discussion

26.	Electrolysis of 50% H.SO, produces
Answer» `H_2S_2O_8` at ANODE `H_2SO_5` at CATHODE `H_2` at anode `H_2O_2` at anode and cathode ANSWER :A

Discussion

27.	Electrolysis of 50%" "H_(2)SO_(4) produces
Answer» `H_(2)S_(2)O_(8)` at ANODE `H_(2)SO_(5)` at cathode `H_(2)` at anode `H_(2)O_(2)` at anode & Cathode Answer :A

Discussion

28.	Electro-osmosis was discovered by
Answer» Dorn Reuss and PORRET Freundlich Langmuir Solution :Reuss and Porret.

Discussion

29.	Electrinoic configuration of species M^(2+) is 1s^(2) 2s^22p^63s^23p^63d^6 and its atomic weight is 56.The number of neutrons in the nuclcus of species M Is…………..
Answer» 26 22 30 24 Solution :`M^(2+)`:`1s^2``2s^2``2p^6``3s^2``3p^6``3d^6` M:`Is^2``2s^2``2p^6``3s^2``3p^6``3d^8` ATOMIC number=26 Mass number=56 No.of netutrons=56-26=30

Discussion

30.	Electriccookers have a coating of thatprotectes them against fire.
Answer» HEAVY lead Magnesium OXIDE ZINC oxide SODIUM sulphate Answer :2

Discussion

31.	Electric cookers have a coating that protects them against firer. The coating is made of
Answer» Heavy LEAD MAGNESIUM oxide ZINC oxide Sodium SULPHATE ANSWER :B

Discussion

32.	Elements with high electronegativity are generally
Answer» GOOD REDUCTANTS HARD solids Good oxidants Soft solids Answer :C

Discussion

33.	Elaborate the term compound atoms as used by Dalton
Answer» Solution :The TERM compound atoms was used by Dalton to EXPRESS the substances obtained by the combination of atoms of different elements in a FIXED, simple and WHOLE number RATIO.

Discussion

34.	Eka silicon is now known as
Answer» SCANDIUM Gallium Germanium BORON ANSWER :C

Discussion

35.	Eka-aluminium andeka- silicon were the namesgivenby Mendeleev for thethenunknowns elements. What isitsatomic number? Write its group number, electronic configuration, IUPAC and official names.
Answer» Solution :The element whichcomesafternercury in thesame group of theperiodictableis calledeka- mercury . Itsvariousparameters are : Z=80 + 32 = 112 IUPAC name : Uub OFFICIAL name : Cn ( coperniclum) E.C.=[RN]`5f^(14) 6d^(10) 7s^(2)`

Discussion

36.	Eka-aluminium and Eka-siliconare knownas
Answer» Galliumand GERMANIUM ALUMINIUMAND SILICON Ironandsulphur Protonand silicon Solution :NA

Discussion

37.	Einstein was awarded Noble Prize for
Answer» General THEORY of relativity The equation, `E = mc^(2)` ENUNCIATION of QUANTUM theory Explanation of photoelectric EFFECT Answer :D

Discussion

38.	Efficiency of energy conversion in nuclear fission of uranium and nuclear fusion of hydrogen are respectively:
Answer» `0.09%, 0.35%` `0.35%, 0.09%` `0.09%, 0.09%` `0.35%, 0.35%` ANSWER :A

Discussion

39.	Efficiency of a Carnot's engine is 100% when
Answer» sing is at`0^(@)C` sink is at 0K source is at `273^(@)C` sourceis at`100^(@)C` Solution :Efficiency Carnot's cycle is `ETA=(T_(2) - T_(1))/(T_(2))` `T_(1) =` TEMPERATURE of sink, `T_(2) =` Temperature of source For`100%` efficiency , `eta= 1` HENCE, `1= 1- (T_(1))/(T_(2))` or `(T_(1))/(T_(2))=0` or `T_(1) = 0 K`

Discussion

40.	Effective magnetic moment of actinides with 'n' unpaired electrons can be calculated using following relation:
Answer» `g SQRT(J(J+1))BM` `sqrt(N(n+1))BM` `sqrt(n(n+2))BM` `1.9sqrt(n+1)BM` ANSWER :A

Discussion

41.	Effect of fluorosis disease is......
Answer» irritation in stomach. causes heart diseases. weakness of teeth and bones. weakness of vision Solution :DAISES like flourocis OCCURS when the AMOUNT of flourine will be more than 10 ppm in drinking water. In which, teeth and bones getting weaked.

Discussion

42.	Edge length of a cube is 400 pm , its body diagonal would be
Answer» 500 pm 600 pm 566 pm 693 pm Solution :Body DIAGONAL =`SQRT3A` =1.732 x 400 pm =692.28 pm `approx` 693 pm

Discussion

43.	Edge length of a cube is 400 pm, its body diagonal would be
Answer» 500 pm 600 pm 566 pm 693 pm SOLUTION :BODY diagonal = `SQRT3 a` ` = 1.732 xx 400 "pm" = 692. 28"pm" = 693 "pm" `

Discussion

44.	Ease of aromatic nucleophilic substitution among these compound will be in the order as :
Answer» `(V) gt (II) gt (III) gt (I) gt (IV)` `(IV) gt (I) gt (III) gt( II) gt (V)` `(IV) gt (III) gt (II) gt (V) gt (I)` `(V) gt (III) gt (II) gt (IV) gt (I)` Solution :De activated group INCREASE , reactivity of aromatic NUCLEOPHILIC SUBSTITUTION reaction .

Discussion

45.	Ease of formation of anion is favoured by
Answer» LOWER VALUE of IONISATION energy higher value of electronegativity lower value of ELECTRON affinity higher value of electron affinity Answer :D

Discussion

46.	Earth's protective umbrella existing in the stratosphere is known as ______
Answer» ANSWER :OZONE LAYER

Discussion

47.	E_(Al^(3+)//Al)^0 =- 1.66 V and E_(Tl^(3+)//Tl)^0 = 1.26 V. Then which of the following statements is correct?
Answer» ALUMINIUM has high TENDENCY to form `Al^(3+)` ions in aqueous solution. `Tl^(3+)` is unstable in aqueous solution `Tl^(3+)` is a powerful OXIDISING agent Al is a powerful reducing agent Answer :D

Discussion

48.	Each unit cell of NaCl consists of 4 chlorine ions and:
Answer» 13 NA ATOMS 4 Na atoms 6 Na atoms 8 Na atoms Answer :B

Discussion

49.	Each rubidium halide crystallising in the NaCl type lattice has a unit cell length 0.30 Å greater than for corresponding potassium salt (r_(K^+)=1.33 Å) of the same halogens . Hence, ionic radius of Rb^+ is
Answer» 1.03 Å 1.18 Å 1.48 Å 1.63 Å Solution :As RBX crystallies in NaCl type lattice, unit cell length of RbX =`2(r_(Rb^+)+r_(X^-))` Unit cell length of KX =`2(r_(K^+) + r_(X^-))` `therefore 2(r_(Rb^+)+r_(X^-))-2(r_(K^+)+r_(X^-))`=0.30 Å or `r_(Rb^+) - r_(K^+)`=0.15 Å or `r_(Rb^+) = r_(K^+)`+ 0.15 Å =1.33 +1.15=1.48 Å

Discussion

50.	Each rubidium halide crystallising in the NaCl type lattice has a unit cell length0.30 Ågreaterthan for corresponding potassium salt ( r_(K^(+))= 1.33 Å ) of the same halogen. Hence, ionic radius ofRb^(+) is
Answer» 1.03 Å 1.18 Å 1.48 Å 1.63 Å Solution :As RBX crystalliesin NaCl type LATTICE, unit CELL length of RbX = `2 ( r_(Rb^(+)) + r_(X^(-))` Unit cell length of KX =`2 (r_(K^(+)) + r_(X^(-))` ` 2( r_(Rb^(+)) + r_(X^(-)))-2 (r_(K^(+)) + r_(X^(-))) = 0.30 Å` ` or r_(Rb^(+)) - r_(K^(+)) = 0.15 Å` ` orr_(Rb^(+) = r_(K^(+)) + 0.15 Å = 1.33 + 1.15 = 1.48 Å`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Electron affinity of oxygen is less negative than sulphur. Justify this statement.

Electron affinity of Fluorine is less than that of Chlorine because

Electron affinity of chlorine is more than that of fluorine explain.

Electronaffinityis positivewhen

Electron affinity is measured in

Electron affinity is

Electromnn - defcienent hydroride is/are

Electromeric effect is a temporary effect. Assign reason.

Electromagnetic radiationof wavelength242nm isjustsufficientto ionise thesodiumatom .Calculatethe ionisation energyofsodiumin Kj mol^(-1)

Electromeric effect involves the complete transfer of

Electromeric effect can be relayed in

Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy of sodium in kJ mol^(-1)

Electromagnetic radiation with minimum wavelength is

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out

Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H_(2)O_(2) The number of peroxybonds present in X and Y. Then x + y is?

Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H_(2)O_(2). The number of peroxy (O-O_ bonds present in X and Y respectively, are

Electrolysis of potassium salt of 3-methyl butanoic acid gives an alkane ‘A’. The name of alkylIodide which gives same alkane on treatment with sodium metal in dry ether solvent is

Electrolysis of molten saline hydride generally gives

Electrolysis of KCl. MgCl_2 . 6H_2O gives: potassium only magnesium only magnesium and chlorine potassium and magnesium.

Electrolysis of aqueous solution of sodium salt of Maleic acid and Fumaric acid gives

Electrolysis of aqueous solution of CH_(3)COOK gives

Electrolysis of aqueous solution of ammonium sulphate and sulphuric acid at anode gives

Electrolysis of an aqueous solution of potassium acetate, the hydrocarbon obtained

Electrolysis of a concentrated aqueous solution of a compound gave C_2H_6 on anode.The compound is

Electrolysis of 50% H_(2)SO_(4) produces

Electrolysis of 50% H.SO, produces

Electrolysis of 50%" "H_(2)SO_(4) produces

Electro-osmosis was discovered by

Electrinoic configuration of species M^(2+) is 1s^(2) 2s^22p^63s^23p^63d^6 and its atomic weight is 56.The number of neutrons in the nuclcus of species M Is…………..

Electriccookers have a coating of thatprotectes them against fire.

Electric cookers have a coating that protects them against firer. The coating is made of

Elements with high electronegativity are generally

Elaborate the term compound atoms as used by Dalton

Eka silicon is now known as

Eka-aluminium andeka- silicon were the namesgivenby Mendeleev for thethenunknowns elements. What isitsatomic number? Write its group number, electronic configuration, IUPAC and official names.

Eka-aluminium and Eka-siliconare knownas

Einstein was awarded Noble Prize for

Efficiency of energy conversion in nuclear fission of uranium and nuclear fusion of hydrogen are respectively:

Efficiency of a Carnot's engine is 100% when

Effective magnetic moment of actinides with 'n' unpaired electrons can be calculated using following relation:

Effect of fluorosis disease is......

Edge length of a cube is 400 pm , its body diagonal would be

Edge length of a cube is 400 pm, its body diagonal would be

Ease of aromatic nucleophilic substitution among these compound will be in the order as :

Ease of formation of anion is favoured by

Earth's protective umbrella existing in the stratosphere is known as ______

E_(Al^(3+)//Al)^0 =- 1.66 V and E_(Tl^(3+)//Tl)^0 = 1.26 V. Then which of the following statements is correct?

Each unit cell of NaCl consists of 4 chlorine ions and:

Each rubidium halide crystallising in the NaCl type lattice has a unit cell length 0.30 Å greater than for corresponding potassium salt (r_(K^+)=1.33 Å) of the same halogens . Hence, ionic radius of Rb^+ is

Each rubidium halide crystallising in the NaCl type lattice has a unit cell length0.30 Ågreaterthan for corresponding potassium salt ( r_(K^(+))= 1.33 Å ) of the same halogen. Hence, ionic radius ofRb^(+) is