52671 + Interview Questions in Chemistry in Class 11

1.	Out of three isomeric pentanes, ______ has the maximum bp. and ________has the maximum m.p.
Answer» ANSWER :n-pentane, NEOPENTANE

Discussion

2.	Out of the three stes of matter, only the gases have most of the physical properties common. They neither have definite shapes nor volumes. Upon mixing they form hoogeneous mixture irespective of their nature and can also be compressed on applying pressure. In addition to these, the gases obey different gas laws such as Noyle's Law, Charles's Law, Dalton's Law of partial pressures, Graham's Law of diffusion etc. Based upon these laws, ideal gas equation PV = nRT has been derived. For an ideal gas, number of moles per litre in terms of its pressuure P, gas constant R and temperature T is :
Answer» `PT//R` `PRT` `P//RT` `RT//P` Solution :for an IDEAL gas, `PV= nRT, (n)/(V) = (P)/(RT)` No. of `"MOLES"//L = (P)/(RT)` `R = (PV)/(nT)`.

Discussion

3.	Out of the three stes of matter, only the gases have most of the physical properties common. They neither have definite shapes nor volumes. Upon mixing they form hoogeneous mixture irespective of their nature and can also be compressed on applying pressure. In addition to these, the gases obey different gas laws such as Noyle's Law, Charles's Law, Dalton's Law of partial pressures, Graham's Law of diffusion etc. Based upon these laws, ideal gas equation PV = nRT has been derived. Same mass of CH_(4) and H_(2) at taken in a container. The partial pressure caused by H_(2) is
Answer» `8/9` `1/9` `1/2` `1` SOLUTION :DEVIATIONS ARISE because of molecular ATTRACTION.

Discussion

4.	Out of the three stes of matter, only the gases have most of the physical properties common. They neither have definite shapes nor volumes. Upon mixing they form hoogeneous mixture irespective of their nature and can also be compressed on applying pressure. In addition to these, the gases obey different gas laws such as Noyle's Law, Charles's Law, Dalton's Law of partial pressures, Graham's Law of diffusion etc. Based upon these laws, ideal gas equation PV = nRT has been derived. Which pair of gaseous species diffuse through a small jet with the same rate of diffusion at same P and T ?
Answer» `NO,CO` `NO,CO_(2)` `NH_(3), PH_(3)` `NO, C_(2)H_(6)` Solution :NO and `C_(2)H_(6)` have the same molar mass i.e., `3.0 G mol^(-1)`.

Discussion

5.	Out of the three stes of matter, only the gases have most of the physical properties common. They neither have definite shapes nor volumes. Upon mixing they form hoogeneous mixture irespective of their nature and can also be compressed on applying pressure. In addition to these, the gases obey different gas laws such as Noyle's Law, Charles's Law, Dalton's Law of partial pressures, Graham's Law of diffusion etc. Based upon these laws, ideal gas equation PV = nRT has been derived. When the produce of pressure and volume is plotted against pressure for a given amount of a gas, the obtained is
Answer» PARALLEL to X-axis parallel to Y-axis linear with positive slope linear with negative slope Solution :PLOT of PV VS P is parallel to `X-`axis

Discussion

6.	Out of the oxides given below, which of them cannot be reduced by H_(2) I (Al_(2)O_(3)) ,II (CuO), (III)(ZnO)
Answer» only I I and II I,II, and III III and II. Answer :A

Discussion

7.	Out of the three stes of matter, only the gases have most of the physical properties common. They neither have definite shapes nor volumes. Upon mixing they form hoogeneous mixture irespective of their nature and can also be compressed on applying pressure. In addition to these, the gases obey different gas laws such as Noyle's Law, Charles's Law, Dalton's Law of partial pressures, Graham's Law of diffusion etc. Based upon these laws, ideal gas equation PV = nRT has been derived. 4-4 g of a gas at STP occupies a volume of 2.224 L. The gas can be :
Answer» `O_(2)` `CO` `NO_(2)` `CO_(2)` SOLUTION :`2.24 L` of GAS at STP weigh `= 4.4 G` `22.4 L` of gas STP weigh `= ((4.4 g) xx (22.4))/((2.24L)) = 44.0 g` The gas is `CO_(2)`.

Discussion

8.	Out of the four liquids given below, the one having lowest vapour pressure at 25^(@)C is
Answer» Carbon tetrachloride Benzene Chloroform Water Solution :The VAPOUR PRESSURE of water is LEAST because of STRONG intermolecular H-bonding in water molecules.

Discussion

9.	Out of the following types of intermolecualar forces (a) Ion dipole (b) Keesom forces (c ) London forces (d) Ion-induced dipole the strongest force is Keeson force .
Answer» SOLUTION :ION DIPOLE is STRONGEST .

Discussion

10.	Out of the following the alkene that exhibits optical isomerism is
Answer» 3-methyl-2pentene 4-methyl-1-pentene 3-methyl-1-pentene 2-methyl-2-pentene Solution :`underset("3-Methyl-1-pentene")(CH_(3)-CH_(2)-overset(H)overset(\|)underset(CH_(3))underset(\|)(**C)-CH=CH_(2))` It is optically ACTIVE since it has chiral carbon atom.

Discussion

11.	Out of the following pairs of electrons, identify the pairs of electrons present in degenerate orbitals :
Answer» `(i) n = 3, I = 2, m_(L)= -2, m_(s)= -1/2` `(ii) n = 3, 1 = 2 m_(l)=-1, m_(s)=-1/2` `(i) n = 3, I = 2, m_(l)= 1, m_(s)= +1/2` (ii) `n = 3, 1 = 2 m_(l)=1, m_(s)=+1/2` `(i) n = 4, I = 2, m_(l)= 1, m_(s)= +1/2` (ii)` n = 3, 1 = 2 m_(l)=1, m_(s)=+1/2` `(i) n = 3, I = 2, m_(l)= +2, m_(s)= +1/2` (ii) `n = 3, 1 = 2 m_(l)=+2, m_(s)=+1/2` Solution :Degenerate ORBITALS m eans the orbitals of the sam E subshell of the sam e m ain shell, i.e., their n and I VALUE. so `3d_(XY)` and `3d_(yz),3d_(x^(2)-y^(2))` and `3d_(x^(2)-y^(2))` indicate pair of degenerate orbitals.

Discussion

12.	Out of the following group 13 elements, element with smallest atomic radius is
Answer» AL Ga In TL Solution :Out of Al, Ga, In and Tl element with smallest atomic radius is GA. Atomic radius of Ga is LESS than Al.

Discussion

13.	Out of Sn^(2+) and Sn^(4+), which one is more stable?
Answer» Solution :`SN^(2+)` ion is more STABLE due to INERT pair effect.

Discussion

14.	Out of SiO_2 (s) , Si(s), NaCl(s) and Br_2(l) which is the best electrical conductor ?
Answer» Solution :SI(s) because only this is a semiconductor, while OTHERS `SiO_2(s)`, NACL(s) and `Br_2`(L) are insulators .

Discussion

15.	Out of sigmaand pi -bonds, which one is stronger and why ?
Answer» Solution :`sigma `-bond is stronger . This is because `sigma `-bond is FORMED by head-on overlapping of atomic orbitals and , THEREFORE , the overlapping is large . `pi` -bond is formed by sideway overlapping whichis SMALL .

Discussion

16.	Out ofsigma _(2s), pi_(2_(p_(x))), pi_(2_(p_(z)))^(**)the gerde molecular orbital (s) is (are)…………. Whereas ungerde molecular orbital (s) is (are) …………
Answer» Solution :`sigma _(2_(s)),pi_(2_(p_(x)))^()` are GERADE whereas ` pi_(2_(p_(x))) and pi_(2_(p_(Z)))^()` are ungerade

Discussion

17.	Out of p - orbital and sp-hybrid orbital which has greater directions character and why ?
Answer» Solution :sp-orbital has greater directional character than p-orbital . Thisis becausep-orbital has EQUAL sized LOBES with equal ELECTRON DENSITY in both the lobes whereas so-hybrid orbital has greater electrons density on one side.

Discussion

18.	Out of p - orbital and sp - hybrid orbital which has greater directional character and why?
Answer» SOLUTION :sp ORBITAL is more directional because most of the sp probability density is on ONE side

Discussion

19.	Out of o-nitrophenod and p-nitrophenol, which has higher boiling point and why ?
Answer» Solution :p-nitrophenol has HIGHER boiling POINT because there is intermolecular H-bonding while in O-nitrophenol , there is INTRAMOLECULAR H-bonding .

Discussion

20.	Out of NH_3 and N_2, which one will have greater value of the van dar Waal's constant 'a'
Answer» Solution :As `NH_3` is more easily LIQUIFIABLE ( due to hydrogen bonding), intermolecular forces of attration are stronger in `NH_3` than `N_2`. Hence `NH_3` will have greater VALUE of .a.. As `NH_3` molecule is larger in SIZE than `N_2`, `NH_3` will have greater value of .b..

Discussion

21.	Out of O and O_(2), which one has a greater ionisation enthalpy and why?
Answer» Solution :O has greater IONISATION enthalpy. In `O_(2)`, first ELECTRON has to be removed from `pi_(2p_(X))^(**)` ORBITAL, which has higher energy than 2p-orbital of O-atom.

Discussion

22.	Out of NaCl and MgO, which one has higher lattice energy?
Answer» Solution :MgO (each ION carries TWO UNIT CHARGE).

Discussion

23.	Out of NaCl and CsCl , which one is more stable and why ?
Answer» Solution :CsCl is more stable than NaCl. This isbecause higher the COORDINATION number, GREATER are the forces of ATTRACTION between the CATIONS and anions in the close-packed arrangement. As CsCl has co-ordination number of 8:8 while NaCl has a coordination number of 6 :6 , therefore, CsCl is more stable.

Discussion

24.	Out of NaCland MgO, which has higher lattice energy and why ?
Answer» Solution :MgO has HIGHER LATTICE energy because each ion CARRIES TWO unit charge whereas in NaCl each ion carries ONE unit charge .

Discussion

25.	Out of NaCl and CsCl, which on is more stable and why ?
Answer» Solution :CsCl is more stable than NaCl. This is because higher the coordiantion number, greater are the FORCES of attraction between the CATIONS a ND the anions in the close-placked arrangement . As CsCl has co-ordination numder of 8 : 8 while NaCl has a coordination number of 6:6 , THEREFORE, CsCl is more stable.

Discussion

26.	Outof N_(2) O , SO_(2), I_(3)^(+), I_(3)^(-), H_(2)O, NO_(2)^(-) and N_(3)^(-) the linear species are
Answer» `NO_(2)^(-), I_(3)^(+), H_(2)O` `N_(2)O,I_(3)^(-), N_(3)^(-)` `N_(2)O, I_(3)^(-), N_(3)^(-)` `N^(3-),I_(3)^(+), SO_(2)` Solution :`N_(2)O` is LINEAR with 2 bp and 3 lp `N_(3)^(-)` is linear with 2 bp around the CENTRAL ATOM

Discussion

27.	Out of Na and Mg , which has higher second ionisation energy?
Answer» Solution :`Na-1S^(2)2S^(s)2p^(6)3s^(1)` Mg - `-1s^(2)2s^(2)2p^(6)3s^(2)` Second ionisation energy of Na is higher because it acquires nearest noble gas configuration after LOSING ONE electron and 2nd electron is to be removed from the noble gas configuration.

Discussion

28.	Out of MgO and CaO, which one is more hard and why ?
Answer» SOLUTION :Mgo is HARDER than CaO . This is baceuse `Mg^(2+)` ions are SMALLER is size than `Ca^(2+)` ions . HENCE, LATTICE energy of MgO is greater .

Discussion

29.	Out of methanoul and water which has higher viscosity and why ?
Answer» SOLUTION :Water has higher VISCOSITY than methanol because INTERMOLECULAR forces (hydrogen bonding) are STRONGER in water than in methanol.

Discussion

30.	Out of Li , Na , K , Rb and Cs , how many of them directly form superoxides on heating with dioxygen ?
Answer» SOLUTION :THREE , K , RB , CS .

Discussion

31.	Out of HF, HCl , BHr and HI , the lowest boiling point is possessed by ………. andhighest melting point is possessed by ………
Answer» SOLUTION :HCL, HI

Discussion

32.	Out of HO^(-) or HS^(-) which one is (a) better nucleophile and (B) a better base ?
Answer» Solution :(a) S is less electronegative than O, therefore, it can DONATE a pair of electrons more easily than O. Thus, `HS^(-)` is a BETTER nucleophile than `HO^(-)`. (b) Since O-H BOND is stronger than S-H bond, therefore `HO^(-)` has a GREATER tendency to accept a proton than `HS^(-)` and hence `HO^(-)` is a better BASE than `HS^(-)`.

Discussion

33.	Out of H and H_(2) , the latter has higher first ionization energy while out of O and O_(2) , the former has higher first ionization energy . Explain why .
Answer» <P> Solution :In `H_(2)` , FIRST electron has to be REMOVED from `sigma` (1s) which has lower energy (more stable ) than H-atom . In `O_(2)` first electron has to be removed from `pi^() (2p_(x)) or pi^() (2p_(y))` ORBITALS which has HIGHER energy than 2 p - orbital of O-atom .

Discussion

34.	Out of given hydroxides find number of hydroxide(s) which can form salt with CO_(2). NaOH, KOH, RbOH, CsOH, Ca(OH)_(2), Sr(OH)_(2), Sr(OH)_(2), Ba(OH)
Answer» SOLUTION :All HYDROXIDES are alkaline so that they can formsalt with acidicgas `CO_(2)`

Discussion

35.	Out of given chemicals, number of chemicals which is/are related to Solvay process : NH_(3), KCI, CO_(2), SO_(2), Ca(OH)_(2), NaCl, H_(1)SO_(4) , NaNO_(3)
Answer» SOLUTION :`NH_(3),CO_(2),NaCI,CA(OH)_(2)`

Discussion

36.	Out of ethylene and acetylene whichis more reactive towards nucleophilic addition reactions and why ?
Answer» Solution :ACETYLENE is more REACTIVE than ethylene towards nucleophilic ADDITION reactions due to greater ELECTRONEGATIVITY of the sp-hybridized CARBON.

Discussion

37.	Out of ethylene and acetylene which is more acidic and why ?
Answer» SOLUTION :Acetylene, DUE to GREATER electronegativity of the sp-hybridized carbon.

Discussion

38.	Out of ethylene and acetylene which is more reactive towards electrophilic addition reactions ?
Answer» SOLUTION :ACETYLENE is LESS reactive than ethylene due to (i)more ELECTRONEGATIVE sp-hybridized carbon atoms and (ii)more stable cylindrical NATURE of `pi`-electrons .

Discussion

39.	Out of electron and proton which one will have, a higher velocity to produce matter waves of the same wavelength ? Explain it
Answer» Solution :`lamda = (h)/(mv)`. For same value of `lamda` for TWO different particles, `(h)/(m_(1)v_(1))= (h)/(m_(2)v_(2)). " i.e., " m_(1)v_(1) = m_(2) v_(2)`. THUS, less the mass, greater will be the velocity. Hence, electron will have greater velocity

Discussion

40.	Out of electron and proton which one will have, a higher velocity to produce m atter waves of the same wavelength ? Explain it.
Answer» SOLUTION :Being LIGHTER PARTICLES, electrons will have higher VELOCITY.

Discussion

41.	Out of Cu,Ag,Fe and Zn, the metal which can displace all others atoms from therir salt solutions is:
Answer» Ag Cu Zn Fe Solution :Zn OCCUPIES the top most position among the ELEMENTS listed and can DISPLACE all of them from the queous slat solution

Discussion

42.	Out of cosumic rays, lamda-rays, X-rays and radiowaves,....have minimum wavelength and .....have maximum wavelength
Answer» SOLUTION :COSMIC RAYS, RADIOWAVES

Discussion

43.	Out of CO and CO_(2), "………….." forms complexes.
Answer» ANSWER :`CO`

Discussion

44.	Out of -CHO and gt C = O, which is preferred as a principal functional group ?
Answer» SOLUTION :`CHO`

Discussion

45.	Out of CH_(3)CO O^(-) and OH^(-) which is stronger base and why ?
Answer» Solution :`OH^(-)` ions can combine with `H^(+)` ions more readily than `CH_(3)CO O^(-)` ions can do. Hence, `OH^(-)` is a STRONGER base. Alternatively, the CONJUGATE ACID of `CH_(3)CO O^(-) and OH^(-) are CH_(3)CO OH and H_(2)O`. AS `CH_(3)CO OH` is stronger acid than `H_(2)O` , the conjugate base of `CH_(3)COOH`, viz., `CH_(3)CO O^(-)` will be a weaker base.

Discussion

46.	Out of "CCl"_(4) and SiCl_(4)which one reacts with water ?
Answer» SOLUTION :Due to the presence of d-orbitals in `Si, SiCl_(4)` REACTS with water but due to the absence of d-orbitals in C, `"CCL"_(4)`does not reactwith `H_(2)O`.

Discussion

47.	Out of Ca^(2+) ,Al^(3+), Fe^(3+), Mg^(2+) and Zn^(2+) the reagents NH_(4)Cl and aqueous NH_(3) and precipitate
Answer» `Ca^(2+), Al^(3+)` `Al^(3+), Fe^(3+)` `Fe^(3+), Mg^(2+)` `Mg^(2+), Zn^(2+)` SOLUTION :LOW SOLUBILITY product

Discussion

48.	Out ofCa^(2+) ,Al^(3+), Bi^(3+) ,Mg^(2+)and Zn^(2+)the reagents NH_4Cland aqueous NH_3 will precipitate
Answer» `Ca^(2+) ,Al^(3+) ` ` Al^(3+) ,BI^(3+)` ` Bi^(3+),(Mg^(2+) ` ` Mg^(2+) , ZN^(2+) ` SOLUTION :Group III)reagent

Discussion

49.	Out of bonding and antibonding m.o.'s, which one has lower energy and which one has higher stablility ?
Answer» SOLUTION :Bondingm.o. has LOWER ENERGY and HIGHER STABILITY .

Discussion

50.	Out of benzyl and ethyl carbocation which is more stable?
Answer» SOLUTION :BENZYL CARBOCATION is more STABLE.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Out of three isomeric pentanes, ______ has the maximum bp. and ________has the maximum m.p.

Out of the oxides given below, which of them cannot be reduced by H_(2) I (Al_(2)O_(3)) ,II (CuO), (III)(ZnO)

Out of the four liquids given below, the one having lowest vapour pressure at 25^(@)C is

Out of the following types of intermolecualar forces (a) Ion dipole (b) Keesom forces (c ) London forces (d) Ion-induced dipole the strongest force is Keeson force .

Out of the following the alkene that exhibits optical isomerism is

Out of the following pairs of electrons, identify the pairs of electrons present in degenerate orbitals :

Out of the following group 13 elements, element with smallest atomic radius is

Out of Sn^(2+) and Sn^(4+), which one is more stable?

Out of SiO_2 (s) , Si(s), NaCl(s) and Br_2(l) which is the best electrical conductor ?

Out of sigmaand pi -bonds, which one is stronger and why ?

Out ofsigma _(2s), pi_(2_(p_(x))), pi_(2_(p_(z)))^(**)the gerde molecular orbital (s) is (are)…………. Whereas ungerde molecular orbital (s) is (are) …………

Out of p - orbital and sp-hybrid orbital which has greater directions character and why ?

Out of p - orbital and sp - hybrid orbital which has greater directional character and why?

Out of o-nitrophenod and p-nitrophenol, which has higher boiling point and why ?

Out of NH_3 and N_2, which one will have greater value of the van dar Waal's constant 'a'

Out of O and O_(2), which one has a greater ionisation enthalpy and why?

Out of NaCl and MgO, which one has higher lattice energy?

Out of NaCl and CsCl , which one is more stable and why ?

Out of NaCland MgO, which has higher lattice energy and why ?

Out of NaCl and CsCl, which on is more stable and why ?

Outof N_(2) O , SO_(2), I_(3)^(+), I_(3)^(-), H_(2)O, NO_(2)^(-) and N_(3)^(-) the linear species are

Out of Na and Mg , which has higher second ionisation energy?

Out of MgO and CaO, which one is more hard and why ?

Out of methanoul and water which has higher viscosity and why ?

Out of Li , Na , K , Rb and Cs , how many of them directly form superoxides on heating with dioxygen ?

Out of HF, HCl , BHr and HI , the lowest boiling point is possessed by ………. andhighest melting point is possessed by ………

Out of HO^(-) or HS^(-) which one is (a) better nucleophile and (B) a better base ?

Out of H and H_(2) , the latter has higher first ionization energy while out of O and O_(2) , the former has higher first ionization energy . Explain why .

Out of given hydroxides find number of hydroxide(s) which can form salt with CO_(2). NaOH, KOH, RbOH, CsOH, Ca(OH)_(2), Sr(OH)_(2), Sr(OH)_(2), Ba(OH)

Out of given chemicals, number of chemicals which is/are related to Solvay process : NH_(3), KCI, CO_(2), SO_(2), Ca(OH)_(2), NaCl, H_(1)SO_(4) , NaNO_(3)

Out of ethylene and acetylene whichis more reactive towards nucleophilic addition reactions and why ?

Out of ethylene and acetylene which is more acidic and why ?

Out of ethylene and acetylene which is more reactive towards electrophilic addition reactions ?

Out of electron and proton which one will have, a higher velocity to produce matter waves of the same wavelength ? Explain it

Out of electron and proton which one will have, a higher velocity to produce m atter waves of the same wavelength ? Explain it.

Out of Cu,Ag,Fe and Zn, the metal which can displace all others atoms from therir salt solutions is:

Out of cosumic rays, lamda-rays, X-rays and radiowaves,....have minimum wavelength and .....have maximum wavelength

Out of CO and CO_(2), "………….." forms complexes.

Out of -CHO and gt C = O, which is preferred as a principal functional group ?

Out of CH_(3)CO O^(-) and OH^(-) which is stronger base and why ?

Out of "CCl"_(4) and SiCl_(4)which one reacts with water ?

Out of Ca^(2+) ,Al^(3+), Fe^(3+), Mg^(2+) and Zn^(2+) the reagents NH_(4)Cl and aqueous NH_(3) and precipitate

Out ofCa^(2+) ,Al^(3+), Bi^(3+) ,Mg^(2+)and Zn^(2+)the reagents NH_4Cland aqueous NH_3 will precipitate

Out of bonding and antibonding m.o.'s, which one has lower energy and which one has higher stablility ?

Out of benzyl and ethyl carbocation which is more stable?

Out of three isomeric pentanes, has the maximum bp. and __has the maximum m.p.