52671 + Interview Questions in Chemistry in Class 11

1.	The oxidation number of carbon in CH_(2)Cl_(2) is
Answer» 0 `+2` `-2` `+4` ANSWER :A

Discussion

2.	The oxidation number of C in CH_(2)O is
Answer» `-2` `+2` 0 `+4` ANSWER :C

Discussion

3.	The oxidation number of B is Na_2B_4O_7 is +3 . Is the statement correct ?
Answer» ANSWER :CORRECT

Discussion

4.	The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following is incorrect in this respect ?
Answer» The OXIDATION number of hydrogen is always +1. The algebraic sum of the all the oxidation numbers in a COMPOUND is zero. An ELEMENT in the free or the uncombined state bears oxidation number zero. In all its compounds, the oxidation number of fluorine is -1. Solution :Because oxidation number in hydride compound will be (-1) and oxidation number of `H_(2)` will be zero.

Discussion

5.	The oxidation number of an element in compound is evaluated on the basic of certain rules which of the following rules is not correct in this respect ?
Answer» Solution :O.N of H is always +1 is a WRONG statement SINCE it is +1 hydrogen HALIDES -1 in hydrdes and zero in the `H_(2)` molecule

Discussion

6.	The oxidation number of an element in a compound decides its nature to acts as oxidant or reductant. Oxidation number is defined and the residual charge which an atom has or appears to have in a molecule whenal other atoms are removed from the molecule as ions. Oxidation number is frequently used interchangebly with oxidation state. The stock notations of oxidation number are based on the periodic property-electronegativity. An atom in a molecule can be assigned positive, negative or zero oxidation number by considering its environment. In few cases, oxidation number can evenn be fractional. Oxidation number of Y in YBa_(2)Cu_(2)O_(7) is +3, then oxidation number of Cu is:
Answer» `+7//3` `+5//3` `+2` `+1` SOLUTION :`3 +2xx2+3xxa+7xx(-2)=0` `:.a=+7//3`

Discussion

7.	The oxidation number of an element in a compound decides its nature to acts as oxidant or reductant. Oxidation number is defined and the residual charge which an atom has or appears to have in a molecule whenal other atoms are removed from the molecule as ions. Oxidation number is frequently used interchangebly with oxidation state. The stock notations of oxidation number are based on the periodic property-electronegativity. An atom in a molecule can be assigned positive, negative or zero oxidation number by considering its environment. In few cases, oxidation number can evenn be fractional. Oxidation number of oxygen in K_(2)O, K_(2)O_(2),KO_(2),KO_(3) are in the order:
Answer» `KO_3ltKO_3 ltK_2O_2 LT K_2O` `KO_2 lt KO_3lt K_2O lt K_2O_2` `K_2O lt K_2O_2lt KO_2 lt KO_3` `KO_3 lt K_2Olt KO_2 lt K_2O_2` SOLUTION :OXIDATION no . if O is –2,–2,–1/2 and –1/3 RESPECTIVELY .

Discussion

8.	The oxidation number of an element in a compound decides its nature to act as oxidant or reductant. Oxidation number is defined as the residual charge which an atom has or appears to have in a molecule when all other atoms are removed from the molecule as ions. Oxidation number is frequently used interchangebly with oxidation state. The stock notations of oxidation numbers are based on the periodic property - electronegativity. An atom in a molecule can be assigned positive, negative or zero oxidation number by considering its environment. In few cases, oxidation number can even be fractional. Maximum oxidation state shown by Os, Ru and Xe in their compounds is :
Answer» `+8` `+6` `+10` `+4` SOLUTION :In `OsO_4 and RuO_4 and XeO_6^(4-)`

Discussion

9.	The oxidation nuber fo an atom in a given species (molecule ion, or free atom ) is the .
Answer» formal charge of the atom valency of the atom actual charge of atom actual charge FO the atom if the atom exists as a mono-atomic ION or the HYPOTHETICAL charge assinged to the atom in the species by simple rules Solution :In the case of a single-atom ion, OXIDATION number corresponds to the actual charge on the ion. In molecules and `//` or polyatomic ions, oxidation number corresponds to the mumber of charges an atom have in a molecule (or polyatomic ion ) if electrons were transferred completely to more electronegative atom.

Discussion

10.	The oxidant which is used as an antiseptic is ______
Answer» `KBrO_(3)` `KMnO_(4)` `CrO_(3)` `KNO_(3)` Answer :B

Discussion

11.	The oxalic acid is added in test tube and this reaction Fe_((aq))^(3+) + SCN_((aq))^(-) hArr [Fe(SCN)]_((g))^(2+)equilibrium, steered and remain the solution than what will the change in colour of solution ?
Answer» Solution :The intensity of red colour of solution is DECREASE because the oxalate ion, `C_2O_4^(2-)`of oxalic acid is reacts with `Fe^(3+)` ion and decrease the concentration of `Fe^(3+)`. The reaction should be forward an red colour containing `[Fe(SCN)]_((AQ))^(2+)`is decrease, the red colour decreases.

Discussion

12.	which is not a moneran
Answer» `s-s` p-p `s-p` both (a) and (B) ANSWER :B

Discussion

13.	The overall effect of respiration is similar to that of "_______________".
Answer» photosynthesis corrosion combustion bleaching Answer :C

Discussion

14.	The outermost electronic configuration of the element with highest value of electron affinity is ………
Answer» `NS^(2)np^(3)` `ns^(2)np^(5)` `ns^(2)np^(4)` `ns^(2)np^(6)` ANSWER :b

Discussion

15.	The outermost electronic configuration of most electropositive element is
Answer» `NS^(s)` `ns^(2)NP^(2)` `ns^(2)` `np^(3)` `ns^(2)np^(5)` Answer :A

Discussion

16.	The outermost electronic ccnfiguration of manganese (at.no.=25)is…………….
Answer» SOLUTION :`3D^(5)4S^(2)`

Discussion

17.	The outer shell configuration of the most electronegative element is
Answer» `NS^(2) np^(3)` `ns^(2) np^(4)` `ns^(2) np^(5)` `ns^(2) np^(6)` Solution :(`ns^(2) np^(5)` REPRESENTS halogen)

Discussion

18.	The outer electronic configuration of someelements are given below : (i)3s^(2) 3p^(3) (ii) 3d^(5) 4s^(1) (iii) 3s^(2) 3p^(6) 4s^(2) (iv) 5d^(1) 6s^(2) (v) 4f^(1) 5d^(1) 6s^(2) Stateof which blockof theperiodic tableeach of thetheseelementsbelongs
Answer» <P> SOLUTION :(i) p, (ii) d, (III) s, (iv) d, (v) F

Discussion

19.	The outer electronic configuration of chromium atom is 3d^4 4s^2
Answer» ANSWER :F

Discussion

20.	The outerelectronicconfigurationof Gd (AtomicNo. 64) is
Answer» `4f^(3) 5D^(3)6s^(2)` `4f^(8)5d^(0)6s^(2)` ` 4f^(4) 5d^(4) 6s^(2)` ` 4f^(7)5d^(1)6s^(2)` SOLUTION :NA

Discussion

21.	The outer electronic configuration of alkaline earth metals is
Answer» `ns^2` `ns^1` `np^6` `nd^10` SOLUTION :`ns^2`

Discussion

22.	Theouterelectronicconfigurationof alkalineearthmetalsis ______.
Answer» `NS^(2)` ` ns^(1)` ` NP ^(6)` ` nd^(10)` Answer :A

Discussion

23.	the outcome of internal liquid of gel on shaking is called :
Answer» SYNERESIS IMBIBITION thixotropy precipitation Answer :C

Discussion

24.	The outcome material from Solvay process is
Answer» `Na_(2)CO_(3).10H_(2)O` `Na_(2)CO_(3)H_(2)O` `NaHCO_(3)` `Na_(2)CO` Solution :The actual manin COMPOUND obtained from sovay process is `NaHCO_(3)` which on ignition gives `Na_(2)CO_(3)`

Discussion

25.	The ortho/para-directing group among the following is
Answer» COOH CN `COCH_3` `NHCOCH_3` SOLUTION :DUE to the presence of a LONE PAIR of ELECTRONS on the N-atom, `-NHCOCH_3` is o, p-directing.

Discussion

26.	The origin of charge on colloidal solution is
Answer» Frictional rubbing Electron capture during bredig's arc method Selective adsorption of ION on their surface It is due to ADDITION of protective colloids Solution :(a), (b) and (C) are correct, (d) is incorrect, LYOPHOBIC sols are stabilized by addition of protective colloid.

Discussion

27.	The orientation of hybrid orbitals is tetrahderal in
Answer» `NH_(3)` `SCl_(4)` `PCl_(5)` `XeF_(4)` Answer :A

Discussion

28.	The orientation of electron pairsand the shape of molecule are different in
Answer» `BeCl_(2)` `H_(2)O` `BCl_(3)` `"CC"l_(4)` ANSWER :B

Discussion

29.	The organic solvent used in differential extraction is…….in water
Answer» ANSWER :IMMISCIBLE

Discussion

30.	The ore having two different metal atoms is
Answer» haeatite galena magnetite COPPER pyrites. Solution :Copper pyrites contains CU and Fe as CUFES.

Discussion

31.	The order of the oxidation state of the phosphorus atom in H_(3)PO_(2),H_(3)PO_(4),H_(3)PO_(3),andH_(4)P_(2)O_(6) is
Answer» <P>`H_(3)PO_(4)gtH_(3)PO_(2)gtH_(3)PO_(3)gtH_(4)O_(2)O_(6)` `H_(3)PO_(2)gtH_(3)PO_(3)gtH_(4)P_(2)O_(6)gtH_(3)PO_(4)` `H_(3)PO_(3)gtH_(3)PO_(2)gtH_(3)PO_(4)gtH_(4)P_(2)O_(6)` `H_(3)PO_(4)gtH_(4)P_(2)O_(6)gtH__(3)PO_(3)gtH_(3)PO_(2)` SOLUTION :`H_(3)overset(+5)PO_(4)gtH_(4)overset(+4)P_(2)O_(6)gtH_(3)overset(+3)PO_(3)gtH_(3)overset(+1)PO_(2)`

Discussion

32.	The order of stabiliyt of the following carboncation is…..
Answer» `III gt II gt I` `II gt III gt I` `I gt II gt III` `III gt I gt II` Solution : The benzylic cation is EXTRA stabilizaed by resonance. (I) `CH_(2) = CH- overset(OPLUS)(C )H_(2) harr overset(oplus)(C )H_(2)-CH= CH_(2)` alylic cation is stable by resonance (II) `CH_(3)-CH_(2) - overset(+)(C )H_(2)` It is least stable as resonance is not possible in it

Discussion

33.	The order of stability of the following tautomeric compounds is : CH_(2)=overset(OH)overset(\|)C-CH_(2)-underset(I)overset(O)overset(\|\|)C-CH_(3) hArr Ch_(3)-overset(O)overset(\|\|)C-CH_(2)-underset(II)overset(O)overset(\|\|)C-CH_(3) hArr CH_(3)-overset(OH)overset(\|)C=CH-underset(III)overset(O)overset(\|\|)C-CH_(3)
Answer» `III GT II gt I` `II gt I gt III` `II gt III gt I` `I gt II gt III` ANSWER :A

Discussion

34.	The order of stability of the following tautomeric compound is CH_(2) = oversetoverset(C ) - CH_(2) - oversetoverset(O)("\|\|")C - CH_(3) hArr CH_(3) - oversetoverset(O)("\|\|")C-CH_(2) - oversetoverset(O)("\|\|")C - CH_(3)hArr CH_(3) - oversetoverset(OH)(\|)C = CH - oversetoverset(O)("\|\|")C - CH_(3)
Answer» III `gt` II `gt` I II `gt` I `gt` III II `gt` III `gt` I O `gt` II `gt` III SOLUTION :`CH_(3) - oversetoverset(OH)(\|)C = CH - oversetoverset(O)(\|)C-CH_(3)` This is more stable because of INTRA molecular hydrogen bonding and conjugation of L.P and `pi` - electrons and between `pi`- electrons

Discussion

35.	The order of stability of thefollowing cabocations CH_(2) = CH- CH_(2)^(+), CH_(3)CH_(2)CH_(2)^(+),C_(6)H_(5)CH_(2)^(+) is
Answer» `III gt II gt I` `II gt III gt I` `I gt II gt III` `III gt I gt II` SOLUTION :Order of STABILITY of CATIONS Benzyl `gt` Allyl `gt I^(@)`

Discussion

36.	The order of stability of the following carbocations :
Answer» `III GT II gt I` `II gt III gt I` `I gt II gt III` `III gt I gt II` ANSWER :D

Discussion

37.	The order of stability of the following carbanions is
Answer» <P>`I gt II gt III gt IV` `IVgt II gt III gt I` `I gt III gt II gt IV` `I gt II gt IV gt III` Solution :Groups with -I and -M EFFECTS at o- & p positions increase the STABILITY of carbanion

Discussion

38.	The order of stability of the carbonium ion is-
Answer» `1^(@) gt 2^(@) gt 3^(@)` `2^(@)GT3^(@)gt1^(@)` `2^(@)gt1^(@)gt3^(@)` `3^(@)gt2^(@)gt1^(@)`. SOLUTION :`3^(@)gt2^(@)gt1^(@)`.

Discussion

39.	The order of stability of dihalides of Ge, Pb and Sn is
Answer» `GeCl_(2) GT SnCl_(2) gt PbCl_(2)` `SnCl_(2) gt GeCl_(2)gt PbCl_(2)` `PbCl_(2)gtGeCl_(2)gt SnCl_(2)` `PbCl_(2)gtSnCl_(2)gt GeCl_(2)` Answer :D

Discussion

40.	The order of solubility of lithium halides in nonpolar solvents follows the order :
Answer» `LiI gt LIBR gt LICL gt LIF` `LiF gt Lil gt LiBr gt LiCl ` `LiCl gt LiF gt LiI gt LiBr` `LiBr gt LiClgt LiF gt LiI` SOLUTION :As the size of the anion increases from `F^(-) ` to `I^(-),` the covalent character increases and hence the solubility in non-polar solvent increases. `LiI gt liBr gt LiCl gt LiF`

Discussion

41.	The orderof screening effect of electrons of s, p, d and f orbitals of a givenshell of anatom on itsouter shellelectrons is :
Answer» `s GTP gt d gt f` `f gt d gt p gt s` ` p lt d lt s gt f` `f gt p gt s gt d` SOLUTION :Within the SAMESHELL SCREENINGEFFECT decreases I N the order`: s gt p gt d gt f,` i.e.,option ( a) iscorrect.

Discussion

42.	The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons is :
Answer» `s GT p gt dgt f` `f gt d gt p gt s` `p lt d lt s gt f` `f gt p gt s gt d` Solution :ORDER of SCREENING effect DECREASES `s gt p gt d gt f` for the same shell.

Discussion

43.	The order of screening effect of electron of s, p, d and f orbits of a given shell of an atom on its outershell electrons is:
Answer» <P>s>p>d>f f>d>p>s p>d>s>f f>p>s>d Answer :a

Discussion

44.	The order of relative ease of formation of various ions is
Answer» `F^(-)GTO^(-2)gtN^(-3)` `N^(-3)gtO^(-2)GTF^(-)` `O^(-2)gtN^(-3)gtF^(-)` `F^(-)gtN^(-3)gtO^(-2)` ANSWER :A

Discussion

45.	The order of reactivity of the following compounds in electrophilic monochlorinatic the most favorable position is
Answer» I lt II lt IV lt III III lt IV lt I lt II IV lt III lt II lt I III lt II lt IV lt I Answer :B

Discussion

46.	The order of reactivity of the following alkyl halides for a S_(N)2 reaction is
Answer» `R -F GT R-Cl gt R-Br gt R-I` `R-F gt R-Br gt R-Cl gt R-I` `R-Cl gt R-Br gt R-F gt R-I ` `R-I gt RBR gt R-Cl gt R-F` ANSWER :D

Discussion

47.	The order of reactivity of the followin alcohols towards conc. HCl is
Answer» `I gt II gt III gt IV` `I gt III gt II gt IV` `IV gt III gt II gt I` `IV gt III gt I gt II` Solution :When alcohols REACT with HX it is the `R-OH` bond which breaks. The more stable the carbocation formed, more is the REACTIVITY of the alcohols. The carbocations formed in case of these alcohols (I, II, III and IV) are `F -CH_(2)-underset((I))(overset(+)(CH))- CH_(3)` `underset((II)) (F-CH_(2)-CH_(2)-overset(+)(CH)-CH_(3))` `underset((III))(CH_(3)-overset(+)(CH)-CH_(3))` `underset((IV))(C_(6)H_(5)-overset(+)(CH_(2))` The relative stabilities of carbocations and hence the order of reactivity of corresponding alcohols is `IV gt III gt II gt I`. The greater stability of carbocation (IV) is due to resonance. Carbocation II is a `2^(@)` carbocation and as such is quite stable. The lesser stability of carbocation I and II is due to the `-I` effect of F. ELECTRON with-drawing effect of F is more in case of carbocation I as in this case F is nearer to the carbon CARRYING +ve charge.

Discussion

48.	The order of reactivity of halogen acids for reaction with C_(2)H_(5)OH is
Answer» `HCl gt HBr gt HI` `HI gt HBr gt HCl` `HBr gt HI gt HCl` `HBr gt HCl gt HI` Solution :The reactivity of HX DEPENDS UPON the ease of dissolved of HX, i.e., bond dissociation ENERGY of HX which increases as`Hi lt HBr lt HCl`.

Discussion

49.	The order of reactivity of differeent hydrogen halides (HCI,HI,HBr)is ……………….
Answer» SOLUTION :`HI GT HBrgt HCI`

Discussion

50.	The order of reactivity of alkenes,underset"I"((CH_3)_2C=CH_2). underset"II"(CH_3CH=CH_2), underset"III"(CH_2=CH_2) when subjected to acid-catalysed hydration is
Answer» I gt II gt III I gt III gt II III gt II gt I II gt I gt III Solution :REACTIVITY increases as the electrondensity in the DOUBLE BOND increases, i.e., I gt II gt III

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The oxidation number of carbon in CH_(2)Cl_(2) is

The oxidation number of C in CH_(2)O is

The oxidation number of B is Na_2B_4O_7 is +3 . Is the statement correct ?

The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following is incorrect in this respect ?

The oxidation number of an element in compound is evaluated on the basic of certain rules which of the following rules is not correct in this respect ?

The oxidation nuber fo an atom in a given species (molecule ion, or free atom ) is the .

The oxidant which is used as an antiseptic is ______

The oxalic acid is added in test tube and this reaction Fe_((aq))^(3+) + SCN_((aq))^(-) hArr [Fe(SCN)]_((g))^(2+)equilibrium, steered and remain the solution than what will the change in colour of solution ?

which is not a moneran

The overall effect of respiration is similar to that of "_______________".

The outermost electronic configuration of the element with highest value of electron affinity is ………

The outermost electronic configuration of most electropositive element is

The outermost electronic ccnfiguration of manganese (at.no.=25)is…………….

The outer shell configuration of the most electronegative element is

The outer electronic configuration of someelements are given below : (i)3s^(2) 3p^(3) (ii) 3d^(5) 4s^(1) (iii) 3s^(2) 3p^(6) 4s^(2) (iv) 5d^(1) 6s^(2) (v) 4f^(1) 5d^(1) 6s^(2) Stateof which blockof theperiodic tableeach of thetheseelementsbelongs

The outer electronic configuration of chromium atom is 3d^4 4s^2

The outerelectronicconfigurationof Gd (AtomicNo. 64) is

The outer electronic configuration of alkaline earth metals is

Theouterelectronicconfigurationof alkalineearthmetalsis ______.

the outcome of internal liquid of gel on shaking is called :

The outcome material from Solvay process is

The ortho/para-directing group among the following is

The origin of charge on colloidal solution is

The orientation of hybrid orbitals is tetrahderal in

The orientation of electron pairsand the shape of molecule are different in

The organic solvent used in differential extraction is…….in water

The ore having two different metal atoms is

The order of the oxidation state of the phosphorus atom in H_(3)PO_(2),H_(3)PO_(4),H_(3)PO_(3),andH_(4)P_(2)O_(6) is

The order of stabiliyt of the following carboncation is…..

The order of stability of the following tautomeric compound is CH_(2) = oversetoverset(C ) - CH_(2) - oversetoverset(O)("||")C - CH_(3) hArr CH_(3) - oversetoverset(O)("||")C-CH_(2) - oversetoverset(O)("||")C - CH_(3)hArr CH_(3) - oversetoverset(OH)(|)C = CH - oversetoverset(O)("||")C - CH_(3)

The order of stability of thefollowing cabocations CH_(2) = CH- CH_(2)^(+), CH_(3)CH_(2)CH_(2)^(+),C_(6)H_(5)CH_(2)^(+) is

The order of stability of the following carbocations :

The order of stability of the following carbanions is

The order of stability of the carbonium ion is-

The order of stability of dihalides of Ge, Pb and Sn is

The order of solubility of lithium halides in nonpolar solvents follows the order :

The orderof screening effect of electrons of s, p, d and f orbitals of a givenshell of anatom on itsouter shellelectrons is :

The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons is :

The order of screening effect of electron of s, p, d and f orbits of a given shell of an atom on its outershell electrons is:

The order of relative ease of formation of various ions is

The order of reactivity of the following compounds in electrophilic monochlorinatic the most favorable position is

The order of reactivity of the following alkyl halides for a S_(N)2 reaction is

The order of reactivity of the followin alcohols towards conc. HCl is

The order of reactivity of halogen acids for reaction with C_(2)H_(5)OH is

The order of reactivity of differeent hydrogen halides (HCI,HI,HBr)is ……………….

The order of reactivity of alkenes,underset"I"((CH_3)_2C=CH_2). underset"II"(CH_3CH=CH_2), underset"III"(CH_2=CH_2) when subjected to acid-catalysed hydration is