Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Given that DeltaH_("comb")of C(s) , H_(2) (g) and CH_(4) (g) are, -394 , -294 and -829 kJ//mol respectively. The heat of formation fo CH_(4) is

Answer»

`70 kJ//mol`
` -71. 8 kJ // mol`
`-244 kJ//mol`
`-748 kJ // mol `

Solution :the formation of `CH_(4)` is represented as :
`C(s)+2H_(2)(g)to CH_(4)(g),`
` DeltaH_(F)=(DeltaH_("comb"))_(R)-(DeltaH("comb")_(P)`
` =[-394+2 (-284)-(-892)kJ`
`-962 + 892 =-70 kJ mol^(-1)`
Discussion
2.

Give the IUPAC names of the following compounds :CH_(3)CH(Cl)CH(Br)CH_(3)

Answer»

Solution :`underset("2-Bromo-3-Chloro BUTANE")(overset(4)(C )H_(3)-underset("Cl")underset("|")(overset(3)(C ))H-underset("Br ")underset("| ")(overset(2)(C ))H-overset(1)(C )H_(3))`
Discussion
3.

Given that DeltaH_(f)(H)=218 kJ//mol,express theH-H bond energy in kcal/mol

Answer»

52.15
911
104
52153

Solution :`DeltaH_(f)(H)=218 KJ//mol`
`DeltaH_(f)(H_(2))=2xx218=436 kJ//mol`
1 kcal = 4.184 kJ
`436 kJ//mol = (1)/(4.184)xx436=104 kcal//mol`.
Discussion
4.

Give the IUPAC names of the following compounds: (a) Glycerol (b)Acetone (c) Formic acid (d) Oxalic acid (e) Isopropyl alcohol (f) Acetaldehyde (g) Acetylene (h) Ethy l alcohol (i) Acetic acid (j) Ethylene (k) Vinyl cyanide

Answer»


Answer :(a) Propane-1,3,3-triol (b) Propanone (c) Methanoic ACID (d) Ethanedioic acid(e) propan-2-ol (f) Ethanol (g) ETHYNE
(H) Ethanol (i) Ethanoic acid (j) Ethene (k) Prop-2-en-1-nitrile.
Discussion
5.

Give the IUPAC names of the following compounds :(C Cl_(3))_(3)C Cl

Answer»

Solution :`UNDERSET("2(Trichloromethyl)-1,1,1,2,3,3,3- heptachloropropane")(Cl_(3)overset(3)(C )-overset(C Cl_(3))overset("|")underset(underset(1)(C )Cl_(3))underset("|")(""^(2)C" ")-CL)`
Discussion
6.

Given that Delta T_(f) is the depression in freezing point of the solvent in a solution of a non-volatile solute of molality m, the quantity lim_(m rarr 0)((Delta T_(f))/(m)) is equal to

Answer»

ZERO
ONE
Three
None of the above

Answer :D
Discussion
7.

Given that C(s)+O_(2)(g)rarrCO_(2)(g), DeltaH=-394 kJ2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l), DeltaH=-568kJCH_(4)(g)+2O_(2)(g)rarrCO_(2)(g)+2H_(2)O(l)DeltaH=-892 kJHeat of formation of CH_(4) is

Answer»

`-70` KJ
71.8 kJ
`-244` kJ
`+782` kJ

Solution :`C+O_(2)rarrCO_(2),DeltaH=-394 kJ "...(i)"`
`2H_(2)+O_(2)rarr2H_(2)O, DeltaH=-568 kJ "...(ii)"`
`CH_(4)+2O_(2)rarrCO_(2)+2H_(2)O, DeltaH=-892 kJ "....(iii)"`
(i) + (ii) - (iii) and find the REQUIRED result.
Discussion
8.

Give the IUPAC names of the following compounds : 2-Chloro -3- methylpentane

Answer»

SOLUTION :Structures of the compounds are GIVEN below :
`CH_(3) - UNDERSET(Cl)underset(|)CH - underset(CH_(3))underset(|)CH - CH_(2)CH_(3)`
Discussion
9.

Give the IUPAC names of the following compounds : 4-tert -Butyl -3- iodoheptane

Answer»

Solution :Structures of the compounds are GIVEN below :
`CH_(3) - CH_(2) - UNDERSET(I)underset(|)CH - underset(C(CH_(3))_(3))underset(|)(CH) - CH_(2)CH_(2)CH_(3)`
Discussion
10.

Given that C(g)+4H(g)rarrCH_(4)(g),DeltaH=-166 kJ The bond energy C-H will be

Answer»

208 KJ/MOLE
`- 41.6` kJ/mole
832 kJ/mole
None of these

Solution :`(-166)/(4)=-41.5 kJ//"mole"`.
Discussion
11.

Given that C+O_(2)rarrCO_(2),DeltaH^(@)=-xKJ and 2CO+O_(2)rarr2CO_(2),DeltaH^(@)=-yKJ The enthalpy of formation of carbon monoxide will be

Answer»

`(y-2x)`
`(2x-y)//2`
`(y-2x)//2`
`(2x-y)`

ANSWER :C
Discussion
12.

Give the IUPAC names of the following compounds : 1,4- Dibromobut -2-ene

Answer»

SOLUTION :Structures of the compounds are GIVEN below :
`BrCH_(2)CH = CHCH_(2)Br`
Discussion
13.

Given thatC+ O_2 to CO_2 , Delta H^@ = -x kJ 2CO +O_2to 2CO_2, Delta H^@ = -y kJThe heat of formation of carbon monoxide will be

Answer»

`(y - 2x)/(2)`
`y + 2x`
`2x - y`
`(2x- y)/(2)`

Solution :`(1) C + O_2 to CO_2 , Delta H_1^@ = -xkJ`
`(2) 2CO + O_2 to 2CO_2 , Delta H_2^@ = - ykJ`
Desired equation for formation of CO is
`C + 1/2 O_2 to Co`
This equation can be obtained by
eqn(1) `+ 1/2 `(reverse of eqn. (2) i.e.,
`C+ O_2 + CO_2 to CO_2 + CO + 1/2O_2`
` therefore Delta H_f^@ (CO)= -x + 1/2 (+y) = y/2 -x = (y-2x)/(2) kJ`
Discussion
14.

Give the IUPAC names of the following compounds : 2-(2-Chlorophenyl)-1-iodooctane

Answer»

SOLUTION :STRUCTURES of the COMPOUNDS are GIVEN below :
Discussion
15.

Given that C + O_(2) rarr CO_(2) Delta H^(theta) = -x kJ 2CO + O_(2) rarr 2CO_(2)Delta H^(theta) = - y kJ The enthalpy of formation of CO is :

Answer»

`(y - 2x)/(2)`
y - 2x
2x - y
`(X - y)/(2)`

Solution :`C + (1)/(2) O_(2) RARR CO`
:. `DELTA H(CO) = Eq. (i) - (1)/(2) Eq. (ii)`
`Delta H = - x + y//2 = (y - 2x)/(2)`
Discussion
16.

Give the IUPAC names of the following compounds : 1-Bromo -4-sec - butyl -2-methylbenzene

Answer»

SOLUTION :STRUCTURES of the COMPOUNDS are GIVEN below :
Discussion
17.

Give the IUPAC names of the following compounds : 1-Chloro -4- ethylclohexane

Answer»

SOLUTION :STRUCTURES of the COMPOUNDS are GIVEN below :
Discussion
18.

Given that bond energies of H - H and Cl - Cl are 430 kJ mol^(-1) and 240 kJ mol^(-1) respectively and Delta_(r)H for HCl is -90 kJ mol^(-1). Bond enthalpy of HCl is

Answer»

290 KJ `mol^(-1)`
380 kJ `mol^(-1)`
425 kJ `mol^(-1)`
245 kJ `mol^(-1)`

SOLUTION :`(1)/(2)H_(2)-(1)/(2)Cl_(2)rarrHCl`
`DeltaH_(f)=[(1)/(2)DeltaH_(H-H)+(1)/(2)DeltaH_(CL-Cl)]-[DeltaH_(H-Cl)]`
`-90=[(1)/(2)xx430+(1)/(2)xx240]-DeltaH_(H-Cl)`
`-90=215+120-DeltaH_(H-Cl)`
`DeltaH_(H-Cl)=335+90=425 kJ//mol`
Discussion
19.

Give the IUPAC names of the following compounds :

Answer»

SOLUTION :
Discussion
20.

Given that 2C(s)+2O_(2)(g)rarr2CO_(2)(g), DeltaH=-787 kJ H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l), DeltaH=-286 kJC_(2)H_(2)(g)+2(1)/(2)O_(2)(g)rarr2CO_(2)(g)+H_(2)O(l), DeltaH=-1301 kJHeat of formation of acetylene is

Answer»

`-1802` kJ
`+1802` kJ
`-800` kJ
`+228` kJ

Solution :Aim:`2C+H_(2(g))rarrC_(2)H_(2(g))`.
eq. (II) + eq. (iii) `rarr`eq. (iv) - eq. (i)
find the required RESULT.
Discussion
21.

Given that at 25^(@) C [Ag(NH_(3))_(2)]^(+) + e^(-) to Ag_(s) + 2NH_(3) ,E^(@) = 0.02 V and Ag^(+) + 1e^(-) to Ag(s) , E^(@) = 0.8 V Hence the order of magnitude of equilibrium constant of the reaction. [Ag(NH_(3))_(2)] to Ag^(+) + 2NH_(3) will be (antilog 0.22 = 1.66)

Answer»

`10^(-10)`
`10^(-6)`
`10^(-14)`
`10^(-18)`

Answer :C
Discussion
22.

Give the IUPAC names of the following: CH_3CH_2CH_2 N(CH_3)(C_2 H_5)

Answer»

SOLUTION :N-Ethyl-N-methyl-1-propanamine
Discussion
23.

Given that bond energies H-H and Cl-Cl are 430 kJ mol^(-1) and 240 kJ mol^(-1) respecively and Delta_(f) H for HCl is - 90 kJ mol^(-1). Bond enthalpy of HCl is :

Answer»

`380 KJ mol^(-1)`
`425 kJ mol^(-1)`
`245 kJ mol^(-1)`
`290 kJ mol^(-1)`

Solution :`(1)/(2) H_(2) + (1)/(2) Cl_(2) rarr 2HCl`
`DELTA H = (1)/(2) B. E (H-H) + (1)/(2) B. E (Cl - Cl) - B. E (H - Cl)`
`- 90 = (1)/(2) (430) + (1)/(2) (240) - B. E. (H - Cl)`
`B. E. (H - Cl) = 215 + 120 + 90 = 425 kJ mol^(-1)`
Discussion
24.

Given that 2C(s) + 2O_(2)(g) rarr 2CO_(2)(g) Delta H = -787 kJ H_(2)(g) + (1)/(2)O_(2)(g) rarr H_(2)O(l) Delta H = -286 kJ C_(2)H_(2)(g) + (2) (1)/(2) O_(2)(g) rarr 2CO_(2)(g) + H_(2)O(l) Delta H = -1301 kJ Heat of formation of acetylene is :

Answer»

`-1802 kJ`
`+1786 kJ`
`-180.2 kJ`
`+228 kJ`

SOLUTION :RTHE required equation is
`2C + H_(2)(g) RARR C_(2)H_(2)(g)`
ADDING eqns. (i) and (ii) and substracting equation (iii)
`Delta H = 228 kJ`
Discussion
25.

Given that a radioactive species decays according to exponential law N= N_(0) e^(-lamda t). The half-life of the species is

Answer»

`LAMDA`
No
`lamda//LN 2`
`ln 2//lamda`

SOLUTION :`t_(1//2) = ln 2//lamda`
Discussion
26.

Give the IUPAC names of the following: CH_3 CH(NO_2) CH_2 NH CH_3

Answer»

SOLUTION :N-methyl-2-nitro-1-propanamine
Discussion
27.

Given that 10g of a dibasic acid (molar mass = 100) are present in 600 mL of the solution. The density of the solution is 1.02 g mL^(-1). Molality of solution is

Answer»

0.17
0.34
0.99
0.01

Answer :A
Discussion
28.

Give the IUPAC names of the following: C_6 H_5N (CH_3) (C_2 H_5)

Answer»

SOLUTION :N-ethyl-N-methylbenzenamine
Discussion
29.

Given : Strength of acid : HA(aq)gtHB(aq)gtHC(aq) Which is Incorrect statement ?

Answer»

Strength of conjugate base: `A^(-)(aq)LTB^(-)(aq)ltC^(-)(aq)`.
Hydrolysis constant : `K_(h)(A^(-))ltK_(h)(B^(-))ltK_(h)(C^(-))`
| Enthalpy of neutralisation with `NaOH|HA(aq)gtHB(aq)GTHC(aq)`.
BOILING point of SOLUTION : `HA(aq)lt HB(aq)lt HC(aq)`.

Solution :Strength of conjugate acid `uarr` strength of conjugate base `darrK_(h)=(K_(W))/(K_(a)),K_(a)uarrK_(h)darr`
|Enthalpy of neutralisation| `uarr`
`K_(a)uarralphauarr"Vant hoff factor "v uarr`
`DeltaT_(b)uarrT_(b)uarr`
Discussion
30.

Give the IUPAC names of the following: C_6 H_5 N^(+) (CH_3)_3 Br^(-)

Answer»

SOLUTION :Trimethylphenylammonium BROMIDE.
Discussion
31.

Given salt is a bromide or iodide. How will you identify it by treating the salt with chlorine water and CS_(2)?

Answer»

Solution :If `CS_(2)` layer ASSUMES an orange COLOUR, it is `Br^(ɵ)` if `CS_(2)` layer assumes a VIOLET colour it is `I^(ɵ)`
Discussion
32.

Give reasons for the following (a) Acetylation of aniline reduces its activation effect. (b) CH_(3)NH_(2) is more basic than C_(6)H_(5)NH_(2). (c) Although -NH_(2) is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.

Answer»

Solution :(i) Due to the reasonance , the electron pair of NITROGENATOM gets delocalised towards carbonyl group/resonating structures.
(ii) Because of `+ I` effect in methylamine electron density at NITROGEN INCREASES whereas in aniline resonance takes place and electron density on nitrogen decreases/ resonating structures.
(III) Due to protonation of aniline/ formation of ANILINIUM ion.
Discussion
33.

Give the IUPAC names of the following: C_6 H_5 (CH_2)_2NH_2

Answer»

SOLUTION : 2-phenyl-1-ethanamine
Discussion
34.

Given reasons for the following features of transition meatal chemistry : (i) The lowest oxide of a transition metal ( say, chromium , atomicnumber 24 ) is basic whereas the highest oxide is usualy acidic. (ii) Transition metals sometimes exhibit very low oxidation states such as +1 and 0.

Answer»

SOLUTION :(i) Lowest oxide of Cr is CrOwhich is basic. The highest oxide is `CrO_(3)` which is acidic. ( In between `Cr_(2)O_(3)` is amphoteric ). Higher the oxidation state of the metal, more EASILY it can accept electron and hence greater is the acidic character.
(ii) ` + 1` oxidation state is shown by Cu because after loss of one electron, it acqires stable CONFIGURATION of`3s^(10)`. Zero oxidation state is shown in forming metal carbonyls, e.g., `Ni(CO)_(4)` because`pi-` ELECTRONS donated by the ligands are accepted into the empty d orbitals.
Discussion
35.

Given{:("Reaction","Energy Change (inKJ)",),(Li(s) rarr Li(g),161,),(Li(g) rarr Li^(+) (g),520,),((1)/(2) F_(2)(g) rarr F(g),77,),(F(g) + e^(-) rarr F(g),("Electron gain enthalpy"),),(Li^(+) (g) + F^(-)(g) rarr LiF(s),-1047,),(Li (s) + (1)/(2) f_(2) (g) rarr LiF(s),-617,):} Based on data provided, the value of electron gain enthalpy of fluorine would be :

Answer»

`-300 kJ mol^(-1)`
`-228 kJ mol^(-1)`
`-328 kJ mol^(-1)`
`-350 kJ mol^(-1)`

Solution :
`Li (s) + (1)/(2)F_(2) (g) RARR LIF(s) = - 617`
`DeltaH = -617 = 161 + 520 + 77 + x - 1047`
`x = -328 kJ mol^(-1)`
Discussion
36.

Give the IUPAC names of the following :

Answer»

SOLUTION :
Discussion
37.

Given reason : Ti^(4+) salts are colourless where as Cr^(3+) salts are coloured.

Answer»

SOLUTION :DUE to `d^(@)`- configuration of `TI^(+4)`. It is COLOURLESS when `CR^(+3)` has `d^(3)` configuration facilitating `d-d` transition.
Discussion
38.

Give the IUPAC names of the complexes (i) K [BF_(4)] (ii) [Fe(C_(5)H_(5))_(2)] (iii) [Mn_(3)(CO)_(12)]

Answer»

Solution :(i) POTASSIUM tetrafluoridoborate (III) (II) BIS (cyclopentadienyl) IRON (iii) dodecacarbonyl trimanganese (0).
Discussion
39.

Given reaction is 2X_((gas))+Y_((gas))hArr2Z_((gas))+80 kcal Which combination of pressure and temperatue gives the highest yield of Z at equlibrium

Answer»

`1000atm and 500^(@)C`
`500atm and 500^(@)C`
`1000atm and 100^(@)C`
`500atm and 100^(@)C`

Solution :The reaction TAKES place with a reduction in number of moles (volume) and is exothermic. So high PRESSRUE and low temperatue, will favour the reaction in forward DIRECTION.
Discussion
40.

Give the IUPAC names of the compounds. Classify them as alkyl, allylic, benzylic, vinylic and aryl halides and also as primary, secondary and tertiary halides. (i ) (CH_3)_3 C CH_2CH (Cl) CH_3 (ii )CH_3 CH_2 CH=CHCH_2 Cl, (iii )(CH_3)_2CHCH_2 CH=C (Cl) CH_2 CH_3 and (iv )C_6 H_5C (Cl ) CH_3)_2

Answer»

Solution :(i) `underset("2-Chloro-4, 4-dimethylpentante ALKYL HALIDE (secondary)")(H_3overset(5)(C)-underset(CH_3)underset(|)overset(CH_3)overset(4|)(C)-overset(3)(C)H_2-underset(Cl)underset(|)overset(2)(C)H-overset(1)(C)H_3)`
(ii) `underset("1 -Chloropent - 2 - ene Allylic halide (primary)")(overset(5)(C)H_3overset(4)(C)H_2overset(3)(C)H=overset(2)(C)Hoverset(1)(C)H_2Cl)`
(III) `underset("2-Chloro - 2 phenylpropane Benzylic halide (TERTIARY)")(C_6H_5-underset(CH_3)underset(|)overset(Cl)overset(|)(C)-CH_3)`
Discussion
41.

Given, R=8.314JK^(-1)mol^-1), the work done during combustion of 0.090 kg of ethane (molar mass=30) at 300 K is

Answer»

`-18.7 kJ`
`18.7kJ`
`6.234kJ`
`-6.234kJ`

SOLUTION :Since, combustion TAKES place at constant pressure,
hence `DeltaH=nC_(p)dT`
`IMPLIES 3W=(0.090)/(30)XX(5)/(2)xx8.314xx300=18.7kJ`
`implies W=6.23kJ`
Discussion
42.

Given preparation of alkyl halides from alcohols.

Answer»

Solution :The hydroxyl group of an alcohol is replaced by halogen on reaction with concentrated halogen acids, phosphorus halides or thionyl chloride.
(i) By reaction of alcohols with halogen acids (HX) :When alcohol is reacted with halogen acids (concentrated), the - OH group is replaced by - X and the haloalkanes are obtained.
The `1^(@)` and `2^(@)` alcohols requires a catalyst `ZnCl_(2)` when reacted with HCl.
(i) `R-OH+HCl overset(ZnCl_(2))rarr R-Cl+H_(2)O`
(ii) `underset("ETHANOL")(CH_(3))-CH_(2)-OH+HCl overset(ZnCl_(2))rarr underset("CHLOROETHANE")(CH_(3)CH_(2))-Cl+H_(2)O`
(iii)`underset("Propan-2-ol")(CH_(3)-underset("OH")underset("|")("CH")-CH_(3))+HCl overset(ZnCl_(2))rarr underset("2-chloropropane")(CH_(3)-underset("Cl")underset("|")("CH")-CH_(3))+H_(2)O`
The reaction of tertiary alcohols with conducted HCl is carried out simply by shaking at a room temperature.
`underset("2-methylpropane-2-ol")(CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-OH+HCl) to underset("2-chloro-2-methylpropane")(CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-Cl+H_(2)O)`
Bromoalkanes are prepared by constant boiling of suitable alcohol with concentrated HBr (48%) or by reaction of alcohol with NABR in presence of `H_(2)SO_(4)`.
`underset("Ethanol")(CH_(3))-CH_(2)-OH+underset(("Conc."))(HBr)to underset("Bromoethane")(CH_(3)CH_(2)Br)+H_(2)O`
`underset("Ethanol")(CH_(3)CH_(2)OH)+NaBr+H_(2)SO_(4)to underset("Bromoethane")(CH_(3)CH_(2)Br)+NaHSO_(4)+H_(2)O`
Good yields of iodoalkanes R - I may be obtained by heating alcohols with sodium or potassium iodide in 95% orthophosphoric acid.
`KI+H_(3)PO_(4)to KH_(2)PO_(4)+HI`
`underset("Ethanol")(CH_(3)CH_(2))-OH+HI to underset("Iodoethane")(CH_(3)CH_(2))-I+H_(2)O`
The order of reactivity of alcohols with a given haloacid is `3^(@)gt 2^(@)gt 1^(@)` and that of haloacid is `HI gt HBr gt HCl`
The preparation of alkyl chloride is carried out either by passing dry hydrogen chloride gas through a solution of alcohol or by heating a mixture of alcohol and concentrated aqueous halogen acid.
(ii) By reaction of alchols with phosphorus halides :Chloroalkanes are prepared by the action of phosphorus trichloride `(PCl_(3))` or phosphorus pentachloride `(PCl_(5))` on alcohols.
`underset("Ethanol")(3CH_(3)CH_(2)OH)+PCl_(3) to underset("Chloroethane")(3CH_(3)CH_(2)Cl)+H_(3)PO_(3)`
`underset("Ethanol")(CH_(3)CH_(2)OH)+PCl_(5)to underset("Chloroethane")(CH_(3)CH_(2)Cl)+POCl_(3)+HCl`
Bromoalkanes and iodoalkanes are prepared by the action of mixture of red phosphorus and `Br_(2)` and `I_(2)` on alcohols. The `PBr_(2)` and `PI_(3)` are produced in situ (Produced in the reaction mixture).
`underset("(Red)")(P_(4))+6Br_(2)to 4PBr_(3)`
`underset("Ethanol")(3CH_(3)CH_(2)OH)+PBr_(3)to underset("Bromoethane")(3CH_(3)CH_(2)Br)+H_(3)PO_(3)`
(iii) By reactions of alcohol with thionyl chloride `(SOCl_(2))` : Thionly chloride is preferred by cause in this reaction alkyl halide is formed along with gases `SO_(2)` and HCl. The two gaseous product are escapable, hence, the reaction gives pure alkyl halides.
`underset("Ethanol")(CH_(3)CH_(2)-OH)+SOCl_(2)to underset("Chloroethane")(CH_(3)-CH_(2)-Cl)+HCl_((g))+SO_(2(g))`
These methods are not suitable for the preparation of aryl halides because the carbon - oxygen bond in phenols has a partial double bond character and is difficult to break being stronger than a SINGLE bond.
Discussion
43.

Given R=8.314 JK^(-1) "mol"^(-1), the work done during combustion of 0.090 kg of ethane (molar mass= 30) at 300 K is

Answer»

`-18.7` kJ
`18.7` kJ
`6.234 kJ`
`-6.234 kJ`

SOLUTION :(i) No. of moles of ethane = `("MASS")/("Molar mass")`
`=(0.090 kg)(30 xx 10^(-3) kg mol^(-1)) = 3` moles
The combustion of `C_(2)H_(6)` (ethane) is as-
`C_(2)H_(6)(g) + 7/2 O_(2)g to 2CO_(2)(g) + 3H_(2)O(l)`
`Deltan = sum n_(g) ("product") - sum n(g)" reactants"`
`=(2) - (3.5+1)`
`=-2.5`
`W = -Deltan RT`
`=-(-2.5 xx 8.314 xx 300) = 6234.5` J
`~= 6.234 kJ`
(ii) For 3 moles: W =`3 xx 6.234 = 18.702 kJ`
Discussion
44.

Given P_(C Cl_(4)^(0))=100 torr, P_(H_(2)O)^(0)=300 torr What will be total pressure after opening the valve? Give your answer after dividing 100.

Answer»


ANSWER :4
Discussion
45.

Give the IUPAC names of K_4[Fe(CN)_6]&[CO(NH_3)_6]Cl_3.

Answer»

Solution :`K_4[FE(CN)_6]_2`: Potssiumhexacyanoferrate (II)`[Co(NH_3)_5CI]CI_2` : Chloropenta-aminecobalt (III) CHLORIDE.
Discussion
46.

Given : PCl_5(g)0. Mention two factors whose change at equilibrium will increase the yield of PCl_5(g)

Answer»


ANSWER :DECREASE in TEMPERATURE RISE in PRESSURE
Discussion
47.

Give the IUPAC names of (i) {:(CH_(3)-CH-" C"-CH-OCH_(2)CH_(3)),("||||"),(""OCH_(3)"O"CH_(3)):} (ii) CH_(3)-CO-underset(C_(2)H_(5))underset("|")"CH"-CH_(2)-CH_(2)-Cl

Answer»

SOLUTION :(i) 2-ethoxy-4-methoxy-3-pentanone and
(II) 3-ethyl-5-chloro-2-pentanone.
Discussion
48.

Given pH of a solution A is 3 and it is mixed with another solution B having pH 2. If both mixed then resultant pH of the solution will be

Answer»

3.2
1.9
3.4
3.5

SOLUTION :pH of the solution A = 3
`[H^(+)]_(B) = 10^(-3)M`.
pH of the solution B = 2
`[H^(+)]_(B) = 10^(-2)M`
`[H^(+)]_(B) = 10^(-3) + 10^(-2) = 10^(-3) + 10 XX 10^(-3) = 11 xx 10^(-3)`.
`pH = -log(11 xx 10^(-3)) = 3 - log 11`
`= 3 - 1.04 = 1.95`.
Discussion
49.

Given P-X curve for a non-ideal liquid mixture(fig). Identify the correct T-X curve for the same mixture.

Answer»




ANSWER :B
Discussion
50.

Give the IUPAC names of (i) (i) {:(CH_(3)-CH-" C"-CH-OCH_(2)CH_(3)),("||||"),(""OCH_(3)"O"CH_(3)):} (ii) CH_(3)-CO-underset(C_(2)H_(5))underset("|")"CH"-CH_(2)-CH_(2)-Cl

Answer»

SOLUTION :(i) 2-ethoxy-4-methoxy-3-pentanone and
(II) 3-ethyl-5-chloro-2-pentanone.
Discussion