52671 + Interview Questions in Chemistry in Class 11

1.	Find the number of molecules, number of atoms and total number of atoms in 5.6 L of CH_(4) at STP.
Answer» ANSWER :ATOM of `CH_(4)=1.5055xx10^(23)`, Atom of `C=1.5050xx10^(23)`, Atom of `H=6.022xx10^(23)`, TOTAL atoms `= 7.5275xx10^(23)`

Discussion

2.	Findthe numberof isobaricpairsfor theelementsrepesentedby (A,z) (232,90),(228,88),(228,89),(214,82),(218,84),(210,81),(216,85),(207,82),(211,83):
Answer» Solution :`{:(,"PAIR"),((228","88),(228","89),(228","90)to ,3),((218","84),(218","85)to,1),((210","81),(210","83),(210","83),(210","83)to,3),((216","85),(216","84)to,1),(, bar(8)underline ):}`

Discussion

3.	Find the number of Falsestatements :
Answer» ANSWER :8

Discussion

4.	Find the number of electrons lost by 1/6 molecule of caffine in the given combustion reaction. C_(8)H_(10)N_(4)O_(2)+ O_(2) to CO_(2)+H_(2)O+NO_(2)
Answer» ANSWER :9

Discussion

5.	Find the number of enantiomeric pairs that can be produced during the monochlroination of n-pentane is
Answer» SOLUTION :Only ONE CHIRAL CARBON is FORMED

Discussion

6.	Find the number of electron - donating groups in resonance among the following : {:("a) "-CONH_(2), "b) "-NO_(2), "c) "-OCOCH_(3), "d) "-COOCH_(3)), ("e) "-CHO, "f) "-NHCOCH_(3),"",""):}
Answer» SOLUTION :`-OCOCH_3 - NHCOCH_3`

Discussion

7.	Find the number of correct statements about (X)? (a) X is cyclic hexametaphosphate (Na_(6)P_(6)O_(18)). (b) X is widely used for softening water. (c) X is long chain linear polyphosphate. (d) X is soluble water. (e) X is known as cyclic calgon. (f) X is Graham salt.
Answer» SOLUTION :(a),(B),(E) and (F)are CORRECT.

Discussion

8.	Find the number of dibromo derivatives of molecular formula C_(3)H_(6)Br_(2) is
Answer» 4 2 6 8 Solution :

Discussion

9.	Find the number of correct statements about NH_(3). (a) Basic gas (b) Turns red litmus to blue litmus (c) Gives white dense fumes with HCI (d) Gives brown ppt. with Nessler's reagent (e) Gives deep blue colour with CuSO_(4) solution with passed in excess (f) Gives deep blue colour with NiCI_(2) solution when passed in excess
Answer» SOLUTION :a,B,C,d,E,F

Discussion

10.	Find the number of correct statements. (a) R has octahedral geometry. (b) overset(III)(Fe) is d^(2)sp^(3) hybridised in R R is paramagnetic (d) R shows optiocal isomerism (e) R shows geometrical isomerism (f) Gas (S) is colourless (g) Gas (S) has bond order of 1 (h) Gas (S) is monoatomic. If total 3 statements are correct, write your answer as 003.
Answer» Solution :`(P) rarr HCOONA`, `(Q) rarr Na_(2)C_(2)O_(4) overset(FeCI_(3))rarr [Fe^(+3)(C_(2)O_(4))_(3)]^(3-)` (R) `d^(2)sp^(3)`, OCTAHEDRAL `(S) rarr H_(2) (B.O = 1)` Correct STATEMENTS `rarr a,b, c,d,f,g`

Discussion

11.	Find the number of correct statement(s): a) CH_(3)Ooverset(oplus)(C)H_(2) is more stable than CH_(3)overset(oplus)(C)H_(2) b) Me_(2)overset(oplus)(C)H is more stable than CH_(3)CH_(2)overset(oplus)(C)H_(2) c) CH_(2)=CH-overset(oplus)(C)H_(2) is more stable than CH_(3)CH_(2) overset(oplus)(C)H_(2) d) CH_(2)=overset(oplus)(C)H is more stable than CH_(3)overset(oplus)(C)H_(2)
Answer» ANSWER :3

Discussion

12.	Find the number of cations when treated with aq. Solution of Na_(2)CO_(3), ppt. of carbonate formed Hg^(+2),Ba^(+2),Cu^(+2),Ag^(+),Pb^(+2)
Answer» SOLUTION :`HG^(+2),Ba^(+2),CU^(+2),Ag^(+),PB^(+2)`

Discussion

13.	Find the number of carbonates having K_(sp) value greater than Li_(2)CO_(3) Na_(2)CO_(3),K_(2)CO_(3),Rb_(2)CO_(3),Cs_(2)CO_(3)
Answer» Solution :`Li_(2)CO_(3)` has the LOWEST SOLUBILITY.

Discussion

14.	Find the number of carbonate precipitates which are white in colour PbCO_(3),3HgO,HgCO_(3),Hg_(2)CO_(3),CuCO_(3).Cu(OH)_(2),BaCO_(3)
Answer» SOLUTION :`PB^(2+),BA^(2+)`

Discussion

15.	Find the number of carbon atoms including the given structure which can have negative change in resonating structures. (The structure with charge reperating are not accepted)
Answer» ANSWER :6

Discussion

16.	How many primary amine structural isomers are possible with the molecular formula C_(4)H_(11)N.
Answer» 6-Aldehyde, 4-Ketone 5-Aldehyde, 3-Ketone 4-Aldehyde, 3-Ketone 5-Aldehyde, 2-Ketone Solution :`C-C-C-C-CHO""C-OVERSET(O)overset(\|\|)C-C-C-C` `C-C-UNDERSET(("d & L"))underset( C )underset(\|)overset(CDOT)C-C-CHO""C-C-overset(O)overset(\|\|)C-C-C` `C-underset( C )underset(\|)C-C-CHO""C-overset(O)overset(\|\|)C-underset( C )underset(\|)C-C` `C-underset( C )underset(\|)overset( C )overset(\|)C-CHO`

Discussion

17.	Find the number of atoms in 48 g of ozone at NTP.
Answer» ANSWER :`1.8066 XX 10^(24)`

Discussion

18.	Find the number of aldehydes and ketones (including with stereo isomers) of Molecular formula C_(5)H_(10)O Can have:
Answer» 6-Aldehyde, 4-Ketone 5-Aldehyde, 3-Ketone 4-Aldehyde, 3-Ketone 5-Aldehyde, 2-Ketone SOLUTION :

Discussion

19.	Find the number of 3^@C present in the given compound
Answer» ANSWER :6

Discussion

20.	Find the normality of oxalic and solution containing 63 g of crystalline oxalic acid in 500 ml of solution.
Answer» Solution :WEIGHT of solute =6.3 g GEW of solute `=(126)/(2)=6.3g` NORMALITY, `N=(W)/(GEW) xx (100)/(V_(ML))=(6.3)/(6.3) xx (100)/(500)=0.2N`

Discussion

21.	Find the momentum of a particle whose de Broglie wavelengh is 1Å.
Answer» Solution :de BROGLIE wave length, `lambda=1Å=1.0xx10^(-10) m` Momentum of a particle, P = ? `lambda=(H)/(P) or P=(h)/(lambda)=(6.625xx10^(-34)KGM^(2)s^(-1))/(1.0xx10^(-10)m)` Momentum of a particle is `6.625 xx 10^(-24) kg ms^(-1)`

Discussion

22.	Find the moles of O_(2) has having pressure 250 bar in 500 mL vessel at 300 K temperature. [R=8.314xx10^(-2)" bar " L K^(-1)mol^(-1)]
Answer» ANSWER :4.296 MOLE

Discussion

23.	Find the molecular weight of Y report your answer as ("Molecular weight")/(2)
Answer» SOLUTION :N//A

Discussion

24.	Find the molecular mass of glucose (C_6H_12O_6) and calculate the mass of one molecule of it.
Answer» Solution :The MOLECULAR formula of GLUCOSE is `C_(6)H_(12)O_(6)`. The molecular mass of glucose: `=(6 xx 12.01) + (12 xx 1.008) + (6 xx 16.0) = 180.156` amu Hence, the gram molecular mass of glucose will be `180.156` g and will contain `6.022 xx 10^23` molecules. `therefore`The mass of one MOLECULE of glucose `=(180.156)/(6.022 xx 10^(23)) = 2.992 xx 10^(-22) g`

Discussion

25.	Find the molecular mass of FeSO_4 7H_(2)O.
Answer» Solution :Sum of ATOMIC mass of all elements = Molecular mass Atomic mass of Fe = 56.0 Atomic mass of S = 32.0 Atomic mass of 4(0] = 64.0 Atomic mass of 14[H] = 14.0 Atomic mass of 7[O] = 112.0 = 278.0 Molecular mass of `FeSO_(4)*7H_(2)O` = 278 G.

Discussion

26.	Find the molarity and molality of a 15% solution of H2S04 (density of H_2SO_4 solution = 1.10 g cm^(-3), Molecular mass of H_2SO_4 = 98).
Answer» Solution :15% solution of `H_2SO_4` means 15 g of `H_2SO_4` are present in 100 g of the solution. Thus, mass of `H_2SO_4` dissolved = 15 g mass of the solution = 100 g. Density of the solution (GIVEN) = `1.10 g cm^(-3)` Calculation of molarity: Moles of `H_(2)SO_(4)` dissovled = `15/98 = 0.135` `therefore` Density `=("Mass")/("Volume")` `therefore` Volume = `("Mass")/("Density")` `therefore` The volume of 100 g of the solution `=100/(1.10)= 90.91 cm^(3) = 0.091 L` The molarity of the solution `=("No. of moles of" H_(2)SO_(4))/("Volume in litres")` `=0.153/0.091 = 1.68 MOL L^(-1)` Hence, the molarity of the given solution is 1.68 M. Calculation of molality : Moles of `H_2SO_4` dissolved = 0.153 Mass of water present in 100 g of solution =100-15 = 85 g = 0.085 kg Molality of the solution `=("No. of moles of" H_(2)SO_(4))/("Mass of water in kg")` `=0.153/0.085 = 1.8 mol kg^(-1)` Hence, the molality of the given solution is 1.8 m

Discussion

27.	The minimum number of carbon atoms to be present in a carboxylic acid to exhibit optical activity is
Answer» SOLUTION :5carbon ATOMS

Discussion

28.	Findthe massof photonof sodiumlamp. Howmuchtimesthismassthanelectronmass ?
Answer» Solution :3.75 `xx 10^(36) kg ` approx `2.5 xx 10^(5) ` TIMES

Discussion

29.	Find the mass of Na_(2)CO_(3) required to prepare 3250 ml of 0.5N solution.
Answer» Solution :NORMALITY, `N=(W)/(GEW) xx (1000)/(V_(ML))` `(0.5)=(W)/(53) xx (1000)/(250)` Weight of `Na_(2)CO_(3)=6.62g`

Discussion

30.	Find the mass of H_2SO_4 present in 100 cm^(3) of a decimolar solution.
Answer» Solution :According to the molarity relation, `w =(M xx M. xx V)/1000` In the present case, `M = 1/10` (the solutioon is decimolar) `M.=98, v = 100 cm^(3)` `therefore w = (1/10 xx 98 xx 100)/1000 = 0.98 g` HENCE, the `100 cm^(3)` of the GIVEN solution CONTAIN 0.98 g of `H_(2)SO_(4)`

Discussion

31.	Find the mass of 7 xx 10^(20) molecules of H_2gas.
Answer» SOLUTION :`2.32 XX 10^(-3)`

Discussion

32.	Find the mass of 450cm^3 of N_2 gas at 32^@C and 750mm of Hg pressure.
Answer» ANSWER :`0.4965`

Discussion

33.	Find the kinetic energy of 2 moles of an ideal gas in calories at 27^@C
Answer» SOLUTION :1800 CAL

Discussion

34.	Find the incorrect statement.
Answer» Smallest ATOM of periodic table is He p- block elements are metals nonmetals and metalloids Noble gases have 8 VALENCE ELECTRONS except He Valence electron and valency is same for group 1 Answer :a

Discussion

35.	Find the hydrolysis constant of NaX, if the dissociation constant of weak acid HX is 2 xx 10^(-5).
Answer» SOLUTION :`5 XX 10^(-10)`

Discussion

36.	Find the hydrogen ion and hydroxyl ion concentrations of the solution if its pH is 3.75
Answer» SOLUTION :`1.8 XX 10^(-4) M ,5.55 xx 10^(-11)`

Discussion

37.	Find the formation enthalpy of SO_(3) from the enthalpyof given reactions. S_(8(s)) + 8O_(2(g)) to 8SO_(2(g)) , DeltaH= -2775 kj/mol 2SO_(2(g)) + O_(2(g)) to 2SO_(3(g)) , DeltaH= - 198 kj/mol
Answer» SOLUTION :`-445.9` k.cal/mole

Discussion

38.	Find thefrequencyandwavelengthof lightrequireionizationof solution . (ionizationenergyof solution=8.2 xx 10^(-19) J)
Answer» SOLUTION :`V = 1.238 xx 10^(15)HZ LAMBDA= 242nm`

Discussion

39.	Find the equivalent weight of H_(3) PO_(4) in each of the following reactions: H_(3) PO_(4) + OH^(-) to H_(2) PO_(4)^(-) + H_(2) O H_(3) PO_(4) + 2OH^(-) to HPO_(4)^(2-) + 2H_(2) O H_(3) PO_(4) + 3OH^(-) to PO_(4)^(3-) + 3H_(2) O
Answer» SOLUTION :98, 49, 32.67

Discussion

40.	Find the equivalent mass of H_3PO_4in the following reaction : Ca(OH)_(2) + H_(3)PO_(4) to CaHPO_(4) + 2H_(2)O
Answer» SOLUTION :Only TWO HYDROGEN ATOMS of `H_3PO_4` are REPLACED.

Discussion

41.	Find the equilibrium constant for below reaction at 298 K temperature. 2NOCI_((g)) hArr 2NO_((g)) + CI_(2(g)) [DeltaH^(@) = 18.4512 Kcal, DeltaS^(@) = 29.16 Cal]
Answer» SOLUTION :`K_(p) = 6.94 xx 10^(-8)`

Discussion

42.	Find the equilibrium constant for below reaction at 25° H_(2(g)) + (1)/(2) O_(2(g)) hArr H_(2) O_((g)) [DeltaG^( @) = -54.64 K.cal]
Answer» SOLUTION :`K_(p) -1.169 xx 10^(40) `

Discussion

43.	Find the energy of each of the photons which (i) corresponds to light of frequency 3 xx 10^(15)Hz (ii) have wavelength of 0.50 Å
Answer» Solution :(i) `v = 3 xx 10^(15) Hz, E = hv = (6.626 xx 10^(-34) JS) (3 xx 10^(15) s^(-1)) = 1.988 xx 10^(-18) J` (II) `lamda = 0.50 xx 10^(-10) m, E = hv = H (c)/(lamda) = ((6.626 xx 10^(-34) Js) (3 xx 10^(15)s^(-1)))/(0.50 xx 10^(-10) s) J = 3.98 xx 10^(-15) J`

Discussion

44.	Find the enthalpy of formation of Hydrogen fluorideon the basis of following data : Bond energy of H-H bond= 434kJ mol^(-1) Body energy of F-F bond = 158 kJ mol^(-1) Bond energyof H-Fbond = 565 kJ mol^(-1)
Answer» Solution :Aim `: (1)/(2) H_(2)+(1)/(2) F_(2) rarr HF, Delta_(r) H =?` `Delta_(r)H= Sigma B.E.` ( REACTANTS) `- Sigma`B.E. ( Products) `=(1)/(2)B.E. ( H_(2)) + (1)/(2) B.E. (F_(2))- B.E. (HF) = (1)/(2 ) xx434 +(1)/(2) XX 158 - 565 = - 269 kJ MOL^(-1)`

Discussion

45.	Find the enthalpy of combustion of carbon ( graphite) to produce carbon monoxide( g)on the basisof data givenbelow:C ( graphite ) + O_(2)(g) rarr CO_(2)(g) + 393. 4 kJ mol^(-1) CO(g) + (1)/(2) O_(2)(g) rarr CO_(2)(g) + 283.0 kJ mol^(-1)
Answer» SOLUTION :AIM `:C(s) + (1)/(2) O_(2)(g) rarr CO(g), DeltaH = ?` Eqn . (i) - Eqn. (II) gives the REQUIRED RESULT.

Discussion

46.	Find the difference between the values of DeltaH and Delta Ufor the combustion n - octane at 25°C.
Answer» SOLUTION :`-11.15 KJ`

Discussion

47.	Find the differencebetween Z_("eff)of 4s and3d electronsof Sc.
Answer» SOLUTION :`Z_("EFF")` of 4s and3d `e^(-)`is samefor Sc .

Discussion

48.	Find the Delta H for the reaction given below. PCI_(5(g))to PCI_(3(g)) + CI_(2(g))
Answer» `DELTAU - RT` `Delta U + 2RT` `Delta U + RT` `Delta U - 2RT` ANSWER :C

Discussion

49.	Find the critical constant (P_(C),V_(C) and T_(C)) in terms of A and B, also find compressibility factor (z) for the following equation of state PV=R R-(A)/(V)+(2B)/(V^(2)) where A and B are constants, P = pressure and V = molar volume. Hence, write the value of (1)/(Z_(C)).
Answer» ANSWER :`0003`

Discussion

50.	Find the density of methane at 298K and 72cm of Hg pressure
Answer» ANSWER :0.62 g/lit

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Find the number of molecules, number of atoms and total number of atoms in 5.6 L of CH_(4) at STP.

Findthe numberof isobaricpairsfor theelementsrepesentedby (A,z) (232,90),(228,88),(228,89),(214,82),(218,84),(210,81),(216,85),(207,82),(211,83):

Find the number of Falsestatements :

Find the number of electrons lost by 1/6 molecule of caffine in the given combustion reaction. C_(8)H_(10)N_(4)O_(2)+ O_(2) to CO_(2)+H_(2)O+NO_(2)

Find the number of enantiomeric pairs that can be produced during the monochlroination of n-pentane is

Find the number of electron - donating groups in resonance among the following : {:("a) "-CONH_(2), "b) "-NO_(2), "c) "-OCOCH_(3), "d) "-COOCH_(3)), ("e) "-CHO, "f) "-NHCOCH_(3),"",""):}

Find the number of correct statements about (X)? (a) X is cyclic hexametaphosphate (Na_(6)P_(6)O_(18)). (b) X is widely used for softening water. (c) X is long chain linear polyphosphate. (d) X is soluble water. (e) X is known as cyclic calgon. (f) X is Graham salt.

Find the number of dibromo derivatives of molecular formula C_(3)H_(6)Br_(2) is

Find the number of cations when treated with aq. Solution of Na_(2)CO_(3), ppt. of carbonate formed Hg^(+2),Ba^(+2),Cu^(+2),Ag^(+),Pb^(+2)

Find the number of carbonates having K_(sp) value greater than Li_(2)CO_(3) Na_(2)CO_(3),K_(2)CO_(3),Rb_(2)CO_(3),Cs_(2)CO_(3)

Find the number of carbonate precipitates which are white in colour PbCO_(3),3HgO,HgCO_(3),Hg_(2)CO_(3),CuCO_(3).Cu(OH)_(2),BaCO_(3)

Find the number of carbon atoms including the given structure which can have negative change in resonating structures. (The structure with charge reperating are not accepted)

How many primary amine structural isomers are possible with the molecular formula C_(4)H_(11)N.

Find the number of atoms in 48 g of ozone at NTP.

Find the number of aldehydes and ketones (including with stereo isomers) of Molecular formula C_(5)H_(10)O Can have:

Find the number of 3^@C present in the given compound

Find the normality of oxalic and solution containing 63 g of crystalline oxalic acid in 500 ml of solution.

Find the momentum of a particle whose de Broglie wavelengh is 1Å.

Find the moles of O_(2) has having pressure 250 bar in 500 mL vessel at 300 K temperature. [R=8.314xx10^(-2)" bar " L K^(-1)mol^(-1)]

Find the molecular weight of Y report your answer as ("Molecular weight")/(2)

Find the molecular mass of glucose (C_6H_12O_6) and calculate the mass of one molecule of it.

Find the molecular mass of FeSO_4 7H_(2)O.

Find the molarity and molality of a 15% solution of H2S04 (density of H_2SO_4 solution = 1.10 g cm^(-3), Molecular mass of H_2SO_4 = 98).

The minimum number of carbon atoms to be present in a carboxylic acid to exhibit optical activity is

Findthe massof photonof sodiumlamp. Howmuchtimesthismassthanelectronmass ?

Find the mass of Na_(2)CO_(3) required to prepare 3250 ml of 0.5N solution.

Find the mass of H_2SO_4 present in 100 cm^(3) of a decimolar solution.

Find the mass of 7 xx 10^(20) molecules of H_2gas.

Find the mass of 450cm^3 of N_2 gas at 32^@C and 750mm of Hg pressure.

Find the kinetic energy of 2 moles of an ideal gas in calories at 27^@C

Find the incorrect statement.

Find the hydrolysis constant of NaX, if the dissociation constant of weak acid HX is 2 xx 10^(-5).

Find the hydrogen ion and hydroxyl ion concentrations of the solution if its pH is 3.75

Find the formation enthalpy of SO_(3) from the enthalpyof given reactions. S_(8(s)) + 8O_(2(g)) to 8SO_(2(g)) , DeltaH= -2775 kj/mol 2SO_(2(g)) + O_(2(g)) to 2SO_(3(g)) , DeltaH= - 198 kj/mol

Find thefrequencyandwavelengthof lightrequireionizationof solution . (ionizationenergyof solution=8.2 xx 10^(-19) J)

Find the equivalent weight of H_(3) PO_(4) in each of the following reactions: H_(3) PO_(4) + OH^(-) to H_(2) PO_(4)^(-) + H_(2) O H_(3) PO_(4) + 2OH^(-) to HPO_(4)^(2-) + 2H_(2) O H_(3) PO_(4) + 3OH^(-) to PO_(4)^(3-) + 3H_(2) O

Find the equivalent mass of H_3PO_4in the following reaction : Ca(OH)_(2) + H_(3)PO_(4) to CaHPO_(4) + 2H_(2)O

Find the equilibrium constant for below reaction at 298 K temperature. 2NOCI_((g)) hArr 2NO_((g)) + CI_(2(g)) [DeltaH^(@) = 18.4512 Kcal, DeltaS^(@) = 29.16 Cal]

Find the equilibrium constant for below reaction at 25° H_(2(g)) + (1)/(2) O_(2(g)) hArr H_(2) O_((g)) [DeltaG^( @) = -54.64 K.cal]

Find the energy of each of the photons which (i) corresponds to light of frequency 3 xx 10^(15)Hz (ii) have wavelength of 0.50 Å

Find the enthalpy of formation of Hydrogen fluorideon the basis of following data : Bond energy of H-H bond= 434kJ mol^(-1) Body energy of F-F bond = 158 kJ mol^(-1) Bond energyof H-Fbond = 565 kJ mol^(-1)

Find the enthalpy of combustion of carbon ( graphite) to produce carbon monoxide( g)on the basisof data givenbelow:C ( graphite ) + O_(2)(g) rarr CO_(2)(g) + 393. 4 kJ mol^(-1) CO(g) + (1)/(2) O_(2)(g) rarr CO_(2)(g) + 283.0 kJ mol^(-1)

Find the difference between the values of DeltaH and Delta Ufor the combustion n - octane at 25°C.

Find the differencebetween Z_("eff)of 4s and3d electronsof Sc.

Find the Delta H for the reaction given below. PCI_(5(g))to PCI_(3(g)) + CI_(2(g))

Find the critical constant (P_(C),V_(C) and T_(C)) in terms of A and B, also find compressibility factor (z) for the following equation of state PV=R R-(A)/(V)+(2B)/(V^(2)) where A and B are constants, P = pressure and V = molar volume. Hence, write the value of (1)/(Z_(C)).

Find the density of methane at 298K and 72cm of Hg pressure