52671 + Interview Questions in Chemistry in Class 11

1.	In the lollowing reuction. AgCl +KIhArr KCl + Agl. As Kl is added, the cquilibrium is shifted towards right giving more Agl precipitate, because
Answer» Both AgCl and Agl are sparingly soluble The `K_(SP) ` of Agl is lower than `K_(sp) ` of AgCl The `K_(sp) `of AG I is higher than `K_(sp) ` of AgCl Both AgCl and Agl have same solubility PRODUCT. Solution :`AgCl_((s)) HARR Ag^(+) +Cl^(-) , Ksp_1` `AgI_((s)) hArr Ag^(+) +I^(-) ,KsP_2` ` AgCl+I^(-) hArr AgI +Cl^(-),K =(Ksp_1)/(Ksp_2) ` as ` I^(-) `is ADDED equation shifts to the right ` rArr K gt 1 rArr (Ksp_1)/(Ksp_2) gt 1 `

Discussion

2.	In the following reaction: 4NO_(2)(g) + O_(2)(g) to 2N_(2)O_(5)(g),DeltaH = - 110 kJ, if N_(2)o_(5)(s) is formed instead of N_(2)O_(5)(g) in the reaction, the enthalpy change (in kJ) would be (enthalpy of sublimation of N_(2)O_(5)(s) is + 53 kJ mol^(-1)).
Answer» `-216` `-162` `+108` `+216` Solution :(i) `4NO_(2)(g) + O_(2)(g) to 2N_(2)O_(5)(g), DeltaH = -110kJ` GIVEN that (ii) `N_(2)O_(5)(s) to N_(2)O_(5)(g) , DeltaH = 53 kJ"mol"^(-1)` (iii)`2N_(2)O_(5)(s) to 2N_(2)O_(5)(g), DeltaH = 106 kJ"mol"^(-1)` Subtracting eq.(iii) from (i), `4NO_(2)(g) +O_(2)(g) to 2N_(2)O_(5)(s)` then `DeltaH = -110-106 = -216 kJ"mol"^(-1)`

Discussion

3.	In the following reaction, A and B respectively are Aoverset(HBr)rarrC_(2)H_(5)Broverset(B)rarrA
Answer» `C_(2)H_(4)` and alcoholic `KOH//Delta` `C_(2)H_(5)Cl` and aq. `KOH//Delta` `C_(2)H_(5)OH` and aq. `KOH//Delta` `C_(2)H_(4) and PBr_(3)` Answer :A

Discussion

4.	In the following reaction : 3A(g)+B(g) hArr 2C(g)+D(g) initial mol of B is double of A.At equilibium mol of A and C are equal . Hence % dissociation of B is :
Answer» ANSWER :10

Discussion

5.	In the reaction 3Br_(2) + 6CO_(3)^(2-) + 3H_(2)O to 5Br^(-) + 2BrO_(3)^(-)+6HCO_(3)^(-)
Answer» OXIDIZED and CARBONATE is REDUCED reduced and WATER is oxidized neither reduced nor oxidized reduce and oxidized Answer :D

Discussion

6.	In the followingquestions morethan one correlation is possible betweenoptions of both columns. Match the following : {:((i),"Entropy of vaporisation",(a),"decreases"),((ii),"K for spontaneous process",(b),"is always positive"),((iii),"Crystalline solid state",(c ) , "lowest entropy"),((iv),DeltaU" in adiabatic expansion of ideal gas",(d) ,(DeltaH_(vap))/(T_(b))):}
Answer» SOLUTION :(i)Entropy of vaporisation is always `+ve` and equal to `DeltaH_(vap) // T_(b)` . Hence, (i) `rarr `(b), (d). (ii) `Delta_(r)G^(@)= - RT ln K `. If K is `+ve`, `Delta_(r)G^(@) = -ve` ad reaction is spontaneous . Hence, (ii) `rarr`(b). (iii) Crystalline solid state has lowest entropy. Hence , (iii) `rarr` (c ) (iv) During adiabaticexpansion of an ideal gas , `q=0`. Hence, `DeltaU = q+W` GIVES`DeltaU = w ,` i.e., work done is at the cost of internal energy which decreases . Hence, `(iv) rarr (a)`.

Discussion

7.	In the followingquestions morethan one correlation is possible betweenoptions of both columns. Match the following :Delta( Parameters)Description {:(,Delta_(r)H^(c-),Delta_(r)S^(c-),Delta_(r)G^(c-),,),((i),+,-,+,(a),"None-spontaneous at high temperature"),((ii),-,-,+ "at high T",(b),"Spontaneous at all temperatures"),((iii),-,+,-,(c ),"Non-spontaneous at all temperatures"):}
Answer» Solution :(i) When `Delta_(r)G^(@)` is `+ve` REACTION is non-SPONTANEOUS at all temperature, i.e., `(i) rarr (a)` (II) `Delta_(r)G^(@) = + ve` at highT means the reaction is non-spontaneous at high temperature, i.e., (ii) `rarr` (a) . (iii) `Delta_(r) H^(@) = -ve` means it favours ,`Delta_(r)S^(@)= + ve`means it ALSO favours. `Delta_(r)G^(@)= -ve` means reaction is spontaneous at all temperatures, i.e, (iii) `rarr`(a).

Discussion

8.	In the followingquestions morethan one correlation is possible betweenoptions of both columns. Match the following :{:( ,A,,B),((i),"Adiabatic process",(i),"Heat"),((ii), "Isolated system",(b),"At constant volume"),((iii),"Isothermal change",(c ) , "First law of thermodynamics"),((iv), "Path function" ,(d) ,"No exchange of energy and matter"),((v),"State function", (e) ,"No transfer of heat"),((vi) , DeltaU=q,(f),"Constant temperature"),((vii),"Law of conservation of energy",(g),"Internal energy "),((viii),"Reversible process",(h),p_(ext)=0),((ix) ,"Free expansion" , (i) ,"At constant pressure"),((x),DeltaH =q,(j),"Infinitely slow process which proceeds through a series of equilibrium states."),((xi) ,"Intensive property",(k) , "Entropy"),((xi),"Extensive property",(l),"Pressure"),(,,(m),"Specific"):}
Answer» ANSWER :(i)-(E),(II)-(d),(iii)-(f),(iv)-(a),(V)-(g),(k),(l),(VI)-(b),(vii)-(c),(vii)-(j),(i x)-(h),(x)-(i),(x i)-(a),(l),(m),(x ii)-(g),(k)`

Discussion

9.	In the followingquestions morethan one correlation is possible betweenoptions of both columns. Match the following : {:(,"Reaction",,"Entropy change"),((i) ,"A liquid vaporises",(a),DeltaS=0),((ii),"Reaction is non-spontaneous at all temperatures and " DeltaH " is positive",(b),DeltaS="positive"),((iii),"Reversible expansion of an ideal gas ",(c ) , DeltaS = "negative"):}
Answer» Solution :(i) When a liquid vaporises, i.e.,liquid `rarr` vapour, entropy increases, i.e.,`DeltaS = + ve`. Hence, `(i) rarr(b)`. (ii) When `DeltaH = +ve. i.e.,` energy factor oppose . The process is non-spontaneous at all TEMPERATURE if entropy factor also opposes the process, i.e., `DeltaS = - ve` . Hence,`(ii) rarr (c )` (iii) In the REVERSIBLE expansion of an ideal gas, the SYSTEM REMAINS in equilibrium at EVERY stage. Hence, `DeltaS =0, i.e., (iii) rarr (a)`.

Discussion

10.	In the following questions a statement of Assertion (A) followed by a statement of Reason (R ) is given. Choose the correct option out of the choices given below. Assertion (A) : Spontaneous process is an irrerversible process and may be reversed by some external agency. Reason (R ) : Decrease in enthalpyisa contributory factor for spontaneity.
Answer» Solution :Correct EXPLANATION. SPONTANEOUS processes are accompaniedby decrease in ENERGY and INCREASEIN randomness.

Discussion

11.	In the following questions a statement of Assertion (A) followed by a statement of Reason (R ) is given. Choose the correct option out of the choices given below. Assertion (A) : A liquid crystallises into a solid andis accompanied by decrease in entropy. Reaction (R ) : In crystals, molecules organise in an ordered manner.
Answer» ANSWER :A

Discussion

12.	In the following questions a statement of Assertion (A) followed by a statement of Reason (R ) is given. Choose the correct option out of the choices given below. Assertion (A) : Combustion of all organic compounds is an exothermic reaction. Reaction (R ) : The enthalpies of all elements in their standard state are zero.
Answer» Solution :CORRECT EXPLANATION. In a COMBUSTION reaction, SUM of enthalpies of REACTANTS is greater than the sum of theenthalpied of products.

Discussion

13.	In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question. Assertion (A) : A liquid crystallizes into a solid and is accompanied by decrease in entropy. Reason (R) : In crystals, molecules organise in an ordered manner.
Answer» Both A and R are TRUE and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is FALSE. A is false but R is true. Solution :Both assertion and reason are true and reason is the correct explanation of assertion. When a liquid crystallises, entropy decreases because in CRYSTALLINE form the MOLECULES are more ORDERED as compared to the liquid.

Discussion

14.	In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question. Assertion (A): Combustion of all organic compounds is an exothermic reaction. Reason (R) : The enthalpies of all elements in their standard state are zero.
Answer» Both A and R are TRUE and R is the correct EXPLANATION of A. Both A and R are true but R is not the correct explanation of A. A is true but R is FALSE. A is false but R is true. Solution :Both assertion and reason are true but reason is not the correct explanation of assertion. Correct explanation : In a combustion reaction, sum of enthalpies of reactants is greater than the sum of the enthalpies of PRODUCTS.

Discussion

15.	In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question. Assertion (A) : Spontaneous process is an irreversible process and may be reversed by some external agency. Reason (R) : Decrease in enthalpy is a contributory factor for spontaneity.
Answer» Both A and R are TRUE and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is FALSE. A is false but R is true. Solution :Both ASSERTION and reason are true but reason is not the correct explanation of assertion. Spontaneous processes are accompanied by decrease in energy and increase in randomness.

Discussion

16.	In the following question, a statement of assertionn is followed by a statement of reason. Mark the correct choice. Assertion: Greater the value of van der waals constant 'a' easier is the liquifaction of a gas. Reason: 'a' indirectly measures the magnitude of attractive forces between the molecules.
Answer» both ASSERTION and reason are true and reason is the CORRECT EXPLANATIONN of assertion both ASSERTIONN and reason are true but reason is not the correct EXPLANATION of assertion Assertionis true but reason is false. both assertion and reason are false. Answer :A

Discussion

17.	In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice. Assertion: Simple distillation can help in separating a mixture of propan-1-ol (boiling point 97^(@)C) and propanone (boiling point 56^(@)C) Reason: Liquids with a difference of more than 20^(@)C in their boiling points can be separated by simple distillation.
Answer» both assertion and REASON are TRUE and reason is the correct explanationn of assertion both ASSERTIONN and reason are true but reason is not the correct EXPLANATION of assertion Assertionis true but reason is false. both assertion and reason are false. Answer :A

Discussion

18.	In the following question, a statement of assertion is followed by a statement of reason, mark the correct choice. Assertion: When Q_(c)=K_(c), reaction is at equilibrium. Reason: At equilibrium, DeltaG^(@) is 0.
Answer» both assertion and reason are TRUE and reason is the correct explanationn of assertion both ASSERTIONN and reason are true but reason is not the correct EXPLANATION of assertion Assertionis true but reason is false. both assertion and reason are false. Answer :B

Discussion

19.	In the following questiona statement of Assertion (A) followed by a statement of Reason (R)isgiven. Choose the correct option out of the choices given below each eqestion. Assertion (A) : Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound Reason (R) : This is because sodium and chloride ions acquire octet in sodium chloride formation.
Answer» A and R both are CORRECT, and R is the correct ecplanation of A. A and R both are correct, But R is not the correct ecplanation of A . A is TRUE but R is FALSE . A and R both are false. ANSWER :A

Discussion

20.	In the following pairs , each number produces the same gas when reacts with water ?
Answer» `K , KO_(2)` `Na, Na_(2)O_(2)` `Ca, CaH_(2)` `BA, BaO_(2)` Solution :Both Ca, `CaH_(2)` react with `H_(2)O` to produce `H_(2)` GAS . `Ca + 2 H_(2) O to Ca(OH)_(2) + H_(2)` `CaH_(2) + 2 H_(2)O to Ca(OH)_(2) + 2H_(2)` In contrast, K reacts with `H_(2)O` to produce `H_(2)` but `KO_(2)` produces `O_(2)` (or `O_(2) + H_(2)O`) , Na produces `H_(2)` but `Na_(2)O_(2)` produces `O_(2)`. Similarly , Ba produces `H_(2)` but `BaO_(2)`produces `O_(2).`

Discussion

21.	In the following monobromination reaction, the number of possible chiral products is
Answer»

Discussion

22.	In the following equation CrO_(4)^(2-)+S_(2)O_(3)^(2-)+overset(ɵ)(O)Hto[Cr(OH)_(4)]^(-1)+SO_(4)^(2-) What volume of 0.2 M Na_(2)S_(2)O_(3) solution.
Answer» 30 mL 80 mL 20 mL 60mL Solution :(i). `3E^(-)+undersetunderset(x=6)(x-8=-2)(CrO_(4)^(2-))toundersetunderset(2x=12)(2x-6=-4)([Cr(OH)_(4)]^(ɵ))` Ew of ``CrO_(4)^(2-)=(Mw)/(3)` (II). `undersetunderset(2x=4)(2x-6=-2)(S_(2)O_(3)^(2-)toundersetunderset(2x=12)(2x-6=-4)(2SO_(4)^(2-)+8e^(-)` " Eq of "`S_(2)O_(3)^(2-)=(Mw)/(8)` `N_(1)V_(1)(CrO_(4)^(2-))=N_(2)V_(2)(S_(2)O_(3)^(2-))` i.e., `m" Eq of "CrO_(4)^(2-)=m" Eq of "S_(2)O_(3)^(2-)` `V_(1)xx0.2xx3=30xx0.2xx8` `V_(1)=(30xx0.2xx8)/(0.2xx3)=80mL`

Discussion

23.	In the following correct statements are
Answer» IUPAC NAME of pyruvic acid is 2-oxopropanoic acid `CH_(3)-underset("OH")underset("\|")("C")H-CH_(2)-CH_(2)-CH_(3)`also called iso AMYL alcohol IUPAC name of acetonitrile is enthanenitrile cinnamic acid is 3-phenylprop-2-enoicacid Solution :IUPAC name of pyruvic acid is 2 oxopropanoic acid. IUPAC name of acetonitrile is enthanenitrile Cinnamic acid is 3-phenylprop-2-enoicacid.

Discussion

24.	In the following compounds The order of acidity is
Answer» `III gt IV gt I gt II` `I gt IV gt III gt II` `II gt I gt III gt IV` `IV gt III gt I gt II` Solution :`-NO_(2)` group is electron WITHDRAWING group while `-CH_(3)` group is electron RELEASING.

Discussion

25.	In the following compounds, The order of acidity is :
Answer» `III gt IV gt I gt II` `I gt IV gt III gt II` `II gt I gt III gt IV` `IV gt III gt I gt II` Solution :Electron WITHDRAWING groups (e.g., `NO_(2)`) increases the ACIDITY of phenol. The effect of electron with-drawing group is more, if it is present at o- or p-position. On the othter hand, electron donating groups (e.g., `CH_(3)-`) make it less acidic.

Discussion

26.	In the following compound, the number of 'sp' hybridized carbonis {:(CH_(2)=C=CH-CH-C-=CH),("\|"),(""CN):}
Answer» 2 3 4 5 Solution :Four, i.e., `{:(CH_(2)=overset(SP)(C)=CH-CH-overset(sp)(C)-=overset(sp)(CH)),("\|"),(""UNDERSET(sp)(C)-=N):}`

Discussion

27.	In the following compound the favourable site/s for protonation is/are:
Answer» a and e a and d b ,C and d a Answer :C

Discussion

28.	In the following compound H - overset(1) C-=overset(2)C-overset(3)(CH_(2))-overset(4)(CH_(3) thehybridization of C2 and C3 carbons are respectively .
Answer» `SP^(3) and sp^(3)` `sp^(2) and sp^(3)` `sp^(2)and sp` `sp^(3) and sp` ANSWER :D

Discussion

29.	In the following chemical reactions, the compounds A and B are respectively:
Answer» BENZENE DIAZONIUM CHLORIDE and benzonitrile Nitrobenzene and chlorobenzene Phenol and bromobenzene Fluorobenzene and phenol Solution :N//A

Discussion

30.	In the following chemical reaction H-C-=CHunderset((2)CH_(3)CH_(2)Br)overset(NaNH_(2)//liq.NH_(3))rarr X=underset((2)CH_(3)CH_(2)Br)overset((1)NaNH_(2)//liq.NH_(3))rarrY X and Y are :
Answer» X = 1-Butyne , Y = 3-Hexyne X = 2-Butyne , Y= 3-Hexyne X = 2-Butyne , Y = 2-Hexyne X = 1-Butyne , Y = 2-Hexyne Answer :A

Discussion

31.	In the following chemical effect, the bonded pair of electron leaves the octet
Answer» INDUCTIVE Saytezeff's Electromeric Electronic Solution : Complete TRANSFER of electron of `PI` bond.

Discussion

32.	In the following change, 3Fe + 4H_(2)O rarr Fe_(3)O_4 + 4H_2If the atomic mass of iron is 56, then its equivalent mass will be :
Answer» 42 21 63 84 Solution :`E=M/3` `3overset(0)(FE) rarr OVERSET(+8/3)(Fe_(3)O_4), E=(56)/(8/3)=21`

Discussion

33.	In the following carbocation, H//CH_(3) that is most likely to migrate to the positively charged carbon is {:(""H""H),("\|""\|"),(H_(3)overset(1)(C)-.^(2)C-._(3)overset(+)C-C^(4)-overset(5)(C)H_(3)),("\|""\|""\|"),(""HO""H""CH_(3)):}
Answer» `CH_(3)` at C-4 H at C-4 `CH_(3)` at C-2 H at C-2 Solution :In the given carbocation, `H^(-)` migrates from C-2 to C-3 because (i) the +ve CHARGE GENERATED on C-2 in I is in CONJUGATION with the n-electrons of the O atom (ii) It is STABILIZED by +I EFFECT of `CH_(3)` group.

Discussion

34.	In the following case(s), hybridisation of the underlined atom is affected, when-
Answer» `underline(P)Cl_(5)` (solid) dissociated into `PC l_(4)^(+) and PC l_(6)^(+)` LiH reacts with `underline(A)lH_(3)` forming `AlH_(4)^(-)` `underline(N)H_(3)` is protonated `H_(3) underline(P)O_(2)` is heated forming `PH_(3)` and `H_(3)PO_(3)` Answer :A::B

Discussion

35.	In the following benzyl/allyl system R-CH=CH_(2)and(R is alkyl group) Then decreasing order of inductive effect is :
Answer» `(CH_(3))_(3)C-GT(CH_(3))_(2)CH-gtCH_(3)CH_(2)-` `Ch_(3)CH_(2)-gt(CH_(3))_(2)CH-gt(CH_(3))_(3)C-` `(CH_(3))_(2)CH-gtCH_(3)CH_(2)-gt(CH_(3))_(3)C-` `(CH_(3))_(3)C-gtCH_(3)CH_(2)-gt(CH_(3))_(2)CH-` ANSWER :A

Discussion

36.	In the first translation series the incoming electron enters the
Answer» 4 d- orbital 3d- orbital 5d -orbital 6d -orbital Answer :B

Discussion

37.	In the figure given below show the location of atoms in three crystallographic planes in a fcc lattice. Draw the unit cell of the corresponding structure and identify these planes in your diagram
Answer» ANSWER :`(##RES_CHM_SS_E03_001_A01##)`

Discussion

38.	In the figure shown the pressure of the confined gas will be:
Answer» 30 CM of Hg 40 cm of Hg 36 cm of Hg 46 cm of Hg Answer :B

Discussion

39.	In the facecentred cubic unit cell, edge length is
Answer» `a/sqrt3r` `4/sqrt2r` `2 r` `sqrt3/2r` SOLUTION :In fcc structure, `SQRT2 a=4 r"or"a=(4R)/sqrt2`

Discussion

40.	In the extraction of silicon by reduction of sand (silica), an excess of sand is always used to prevent the formation of
Answer» Silicon oxide Silicon carbonate Silicon carbide Silicon peroxide Solution :`UNDERSET("Sand")(SiO_(2))(s)+2SiC(s)tounderset("silicon carbide")(3Si(s))+2CO(G)`

Discussion

41.	In the extraction of Fe from Fe_(2)O_(3) the reducing agent is
Answer» C Al electrolytic reduction Cu Solution :N//A

Discussion

42.	In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with
Answer» Copper (I) sulphide Sulphur dioxide (`SO_2`) Iron sulphide (FES) Carbon monoxide (CO). SOLUTION :N//A

Discussion

43.	In the estimation of sulphur in an organic compound, fuming nitric acid is used to convert sulphur into :
Answer» `SO_(2)` `H_(2)S` `H_(2)SO_(3)` `H_(2)SO_(4)` Solution :In the estimation of S, firstly it is CONVERTED into `H_(2)SO_(4)` and then PRECIPITATED as `BaSO_(4)`.

Discussion

44.	In the estimation of sulphur by Carius method, 0.480 f og an organic comppund gives 0.699 g of barium sulphate. The percentage of sulphur in this compound is (atomic masses : Ba = 137, S = 32 and O = 16)
Answer» 0.2 0.15 0.35 0.3 Solution :`%S = (32)/(233) XX (0.699)/(0.480) xx 100 = 20`

Discussion

45.	In the estimation of sulphur by Cari us method, 0.480 g of an organic compound gives 0.699 g of barium sulphate. The percentage of sulphur in this compound is (Atomic masses : Ba= 137, S =32, O = 16) (a) 20% (b) 15% ( c) 35% (d) 30% (e) 40%
Answer» ANSWER :A

Discussion

46.	In the estimation of sulphur by Carius method, 0.468g of an organic sulphur compound afforded 0.668g of barium sulphate. Find out the percentage of sulphur in the given compound. (Ba= 137, S=32, O=16)
Answer» Solution :molar mass of `BaSO_(4)= 137 + 32 (16 xx 4)= 233g` `UNDERSET(32g)(S) rarr underset(233g)(BaSO_(4))` contain 32g sulphur, `:. 0.668g BaSO_(4)` contain Sulphur `= (32 xx 0.668)/(233) gm` % `S = (32)/(233) xx (0.668)/(0.468) xx 100` = 19.60%

Discussion

47.	In the estimation of nitrogen present in an organic compound by Dumas method 0.35 g yielded 20.7 mL of nitrogen at 15^(@)C and 760 mm Hg pressure. Calculate the percentage of nitrogen in the compound.
Answer» Solution :Weight of ORGANIC compound= 0.35 g `"VOLUME of moist nitrogen" (V_(1)) = 20.7 ml = 20.7 xx 10^(-3) L` `"Temperature"= T_(1) =15^(@)C = 273 + 15^(@)C = 288K` `"PRESSURE of moist nitrogen" P_(1)=760 "mmHg"` `(P_(1)V_(1))/(T_(1))=(P_(0)V_(0))/(T_(0))` `V_(0)=(P_(1)V_(1))/(T_(1)) xx (T_(0))/(P_(0))=(760 xx 20.7 xx 10^(-3))/(288) xx (273K)/(760)` `V_(0)=19.62 xx 10^(-3) L` `"Percentage of nitrogen"=(28)/(22.4) xx (V_(0))/(W) xx 100=(28)/(22.4) xx (19.62 xx 10^(-3))/(0.35) xx 100` `=(28)/(22.4) xx (19.62)/(0.35) xx 10^(-1)=56.05 xx 10^(-3) xx 100= 7.007%` `implies` Percentage of nitrogen= 7.007%

Discussion

48.	In the estimation of nitrogen by Duma's method 1.18 g of an organic compound gave 224 ml of N_(2)at NTP. The percentage of nitrogen in the compound is about
Answer» 20 11.8 47.5 23.7 Solution :PERCENTAGE of `N=(244 XX 28)/(22400)xx (100)/(1.18)=23.7 % `

Discussion

49.	In the estimation of nitrogen by Duma's method 1.18g of an organic compound gave 224 ml of N_(2) at STP. The percentage of nitrogen in the compound is
Answer» `20.0` `11.8` `47.5` `23.7` Solution :% of `N=("VOL. of "N_(2)" gas")/("wt.of org. compoun").(28)/(22400).100` `=(224)/(1.18).(28)/(22400).100=23.7%`

Discussion

50.	In the estimation of carbon and hydrogen, if the substance also contains halogens, then near the exit, it is placed:
Answer» a ROLL of SILVER a LAYER of LEAD chromate a layer of lead chromate both, a roll of silver and a layer of lead chromate Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In the lollowing reuction. AgCl +KIhArr KCl + Agl. As Kl is added, the cquilibrium is shifted towards right giving more Agl precipitate, because

In the following reaction: 4NO_(2)(g) + O_(2)(g) to 2N_(2)O_(5)(g),DeltaH = - 110 kJ, if N_(2)o_(5)(s) is formed instead of N_(2)O_(5)(g) in the reaction, the enthalpy change (in kJ) would be (enthalpy of sublimation of N_(2)O_(5)(s) is + 53 kJ mol^(-1)).

In the following reaction, A and B respectively are Aoverset(HBr)rarrC_(2)H_(5)Broverset(B)rarrA

In the following reaction : 3A(g)+B(g) hArr 2C(g)+D(g) initial mol of B is double of A.At equilibium mol of A and C are equal . Hence % dissociation of B is :

In the reaction 3Br_(2) + 6CO_(3)^(2-) + 3H_(2)O to 5Br^(-) + 2BrO_(3)^(-)+6HCO_(3)^(-)

In the following question, a statement of assertion is followed by a statement of reason, mark the correct choice. Assertion: When Q_(c)=K_(c), reaction is at equilibrium. Reason: At equilibrium, DeltaG^(@) is 0.

In the following pairs , each number produces the same gas when reacts with water ?

In the following monobromination reaction, the number of possible chiral products is

In the following equation CrO_(4)^(2-)+S_(2)O_(3)^(2-)+overset(ɵ)(O)Hto[Cr(OH)_(4)]^(-1)+SO_(4)^(2-) What volume of 0.2 M Na_(2)S_(2)O_(3) solution.

In the following correct statements are

In the following compounds The order of acidity is

In the following compounds, The order of acidity is :

In the following compound, the number of 'sp' hybridized carbonis {:(CH_(2)=C=CH-CH-C-=CH),("|"),(""CN):}

In the following compound the favourable site/s for protonation is/are:

In the following compound H - overset(1) C-=overset(2)C-overset(3)(CH_(2))-overset(4)(CH_(3) thehybridization of C2 and C3 carbons are respectively .

In the following chemical reactions, the compounds A and B are respectively:

In the following chemical reaction H-C-=CHunderset((2)CH_(3)CH_(2)Br)overset(NaNH_(2)//liq.NH_(3))rarr X=underset((2)CH_(3)CH_(2)Br)overset((1)NaNH_(2)//liq.NH_(3))rarrY X and Y are :

In the following chemical effect, the bonded pair of electron leaves the octet

In the following change, 3Fe + 4H_(2)O rarr Fe_(3)O_4 + 4H_2If the atomic mass of iron is 56, then its equivalent mass will be :

In the following carbocation, H//CH_(3) that is most likely to migrate to the positively charged carbon is {:(""H""H),("|""|"),(H_(3)overset(1)(C)-.^(2)C-._(3)overset(+)C-C^(4)-overset(5)(C)H_(3)),("|""|""|"),(""HO""H""CH_(3)):}

In the following case(s), hybridisation of the underlined atom is affected, when-

In the following benzyl/allyl system R-CH=CH_(2)and(R is alkyl group) Then decreasing order of inductive effect is :

In the first translation series the incoming electron enters the

In the figure given below show the location of atoms in three crystallographic planes in a fcc lattice. Draw the unit cell of the corresponding structure and identify these planes in your diagram

In the figure shown the pressure of the confined gas will be:

In the facecentred cubic unit cell, edge length is

In the extraction of silicon by reduction of sand (silica), an excess of sand is always used to prevent the formation of

In the extraction of Fe from Fe_(2)O_(3) the reducing agent is

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

In the estimation of sulphur in an organic compound, fuming nitric acid is used to convert sulphur into :

In the estimation of sulphur by Carius method, 0.480 f og an organic comppund gives 0.699 g of barium sulphate. The percentage of sulphur in this compound is (atomic masses : Ba = 137, S = 32 and O = 16)

In the estimation of sulphur by Cari us method, 0.480 g of an organic compound gives 0.699 g of barium sulphate. The percentage of sulphur in this compound is (Atomic masses : Ba= 137, S =32, O = 16) (a) 20% (b) 15% ( c) 35% (d) 30% (e) 40%

In the estimation of sulphur by Carius method, 0.468g of an organic sulphur compound afforded 0.668g of barium sulphate. Find out the percentage of sulphur in the given compound. (Ba= 137, S=32, O=16)

In the estimation of nitrogen present in an organic compound by Dumas method 0.35 g yielded 20.7 mL of nitrogen at 15^(@)C and 760 mm Hg pressure. Calculate the percentage of nitrogen in the compound.

In the estimation of nitrogen by Duma's method 1.18 g of an organic compound gave 224 ml of N_(2)at NTP. The percentage of nitrogen in the compound is about

In the estimation of nitrogen by Duma's method 1.18g of an organic compound gave 224 ml of N_(2) at STP. The percentage of nitrogen in the compound is

In the estimation of carbon and hydrogen, if the substance also contains halogens, then near the exit, it is placed: