94420 + Interview Questions in Chemistry in Class 12 Page 487 InterviewSolution

24301.	The reaction between H_(2)(g)" and "O_(2)(g) is highly feasible yet allowing the gases to stand at room temperature in the same vessel does not lead to the formation of water. Explain.
Answer» Solution :This is because activation ENERGY of the REACTION is very HIGH at room temperature.

Discussion

24302.	The reaction between H_(2(g)) and O_(2(g)) is highly feasible yet allowing the gases to satnd at room temperature in the same vessel does not lead to the formation of water .Explain.
Answer» SOLUTION :This is because ACTIVATION energy for the REACTION is very high at room temperatue .So due to lack of energy bonds of `H_(2)` and `O_(2)` will bot break and inspite of collision product will not FORM.

Discussion

24303.	The reaction between H_(2(g)) and Icl_((g)) occurns in thefollowing steps : (i) H_(2)+ICl rarr HI+HCl (ii) HI+ICl rarr I_(2)+HCl The reaction intermediate in the reaction is
Answer» HCl HI `I_(2)` `I CL` ANSWER :B

Discussion

24304.	The reaction between H_(2(g)) and ICI_((g)) occurs in the following steps : i) H_2+ ICl to HI +HCl ii) HI + IClto I_2+ HCl The reaction intermediate in the reaction is
Answer» HCl ICl `I_2` HI Solution :Reaction intermediate is FORMED in one step and CONSUMED in second step.

Discussion

24305.	The reaction between gaseous NH_(3) and HBr produces the white solid NH_(4)Br. Suppose that NH_(3) and HBr are introduced simultaneously into the opposite ends of an open tube that is 1 metre long. Where would you expect the white solid to form ?
Answer» Solution :Suppose the two gases meet to form a white solid `NH_(4)Br` at a will of `r_(1)`cm from the `NH_(3)` END. Thus from the HBR end, the distance will be `(100 - r_(1)) cm`. We have, `(r_(NH_(3)))/(r_(HBr)) = SQRT((M_(HBr))/(M_(NH_(3)))) = sqrt((81)/(17))` Since the rate of diffusion is proportional to the distance, the molecules travel. `therefore (r_(NH_(3)))/(r_(HBr)) = (r_(1))/(100 - r_(1)) = sqrt((81)/(17)) = 2.18` `therefore r_(1) = 65.55 cm`.

Discussion

24306.	The reaction between Ferric chloride and potassium thio cyanate solution gives a blood red coloured coordination compound as ……………
Answer» Answer :`K_(3)[FE(SCN)_(6)]` Potassium ferrithio CYANATE

Discussion

24307.	The reaction between excesss of C_2H_5OH and H_2 SO_4 at 140^@C gives
Answer» `C_2H_5 HSO_4` `CH_3OH` `C_2 H_5-O-C_2 H_5` `C_2H_5` ANSWER :C

Discussion

24308.	The reaction between ethyl bromide and sodium in dry ether to form butane is called:
Answer» Friedel-crafts REACTION WURTZ reaction Cannizzaro.s reaction Williamson.s reaction ANSWER :B

Discussion

24309.	the reaction between cyanamide NH_(2)CH(s) and oxygen was allowed to complete and DeltaU at 300 K was observed to be -743 kJ mol ^(-1) . The value of DeltaHat 300 K for the combustion reaction NH_(2) CN(s)+3/2 O_(2)(g) to N_(2)(g) + CO_(2)(g) + H_(2)O(l)would be
Answer» `-741. 75 kJ mol ^(-1) ` `-743 KJ mol ^(-1)` `-744 .25 kJ mol ^(-1)` `- 740 . 5 kJ mol ^(-1)` Solution :`DeltaH=DeltaU+(Deltan_(g))RT` `=-743 + 1/2 xx8.314 xx300xx10^(-3)kJ mol^(-1)` `741.75 kJ mol^(-1)`

Discussion

24310.	The reaction between chloral and chlorobenzene in H_(2)SO_(4) yields:
Answer» <P>CHLORETONE `p,p-` DICHLORODIPHENYL trichloroenthane `o-` Chlorobenzaldichloride Chloralphenylchloride Solution :PREPARATION of `D.D.T`

Discussion

24311.	The reaction between copper and hot conc H_2SO_4 gives:
Answer» `SO_3` `SO_2` `CU(OH)_2` `H_2` ANSWER :B

Discussion

24312.	The reaction between CH_3 COCl and KCN followed by hydrolysis yields
Answer» ACETAMIDE acetic ACID Pyruvic acid (2-oxopropanoic acid) METHYL isocyanate Answer :C

Discussion

24313.	The reaction between C_(6)H_(5)NH_(2) and chloroform and a few drops of alcoholic KOH is known as:
Answer» CANNIZZARO's REACTION Carbylamine reaction Frankland reaction Wurtz reaction Answer :B

Discussion

24314.	The reaction between C_2H_5ONa + C_2H_5Ito give C_2H_5OC_2H_5 is called
Answer» WURTZ REACTION Kobles synthesis Williamson's synthesis Hoffman reaction Answer :C

Discussion

24315.	The reaction between Benzaldehyde and methyl amine takes place in a very narrow pH range. For the above reaction optimum pH is
Answer» 2 to 3 4 to 5 5 to 9 12 to 13 Solution :OPTIMUM pH for the above reaction =4-5

Discussion

24316.	The reaction between benzene diazonium chloride and benzene in the presence of NaOH is………..
Answer» PERKIN's reaction Gattermann's reaction Sandmeyer reaction Gomberg-Bachmann reaction Answer :D

Discussion

24317.	The reaction between Aniline and Nitrous acid at very low temp (0 ^(@)C) gives which product ?
Answer» ACETANILIDE BENZENE DIAZONIUM chloride Sodium phenoxide Diphenyl ether Solution :

Discussion

24318.	The reaction between an alcoholand an acid with the elimination of water molecules is called
Answer» Esterfication Saponification Etherification Elimination Solution :`(CH_(3)COOH+CH_(3)OH UNDERSET("ESTERIFICATION")to CH_(3)COOCH_(3)+H_(2)O`

Discussion

24319.	The reaction between an alcohol and an acid with the elimination of water molecule is called
Answer» ESTERIFICATION SAPONIFICATION Etherification ELIMINATION ANSWER :A

Discussion

24320.	The reaction between an alcohol and an acid is known as :
Answer» SAPONIFICATION Esterification Hydrolysis HYDROGENATION Answer :B

Discussion

24321.	The reaction between alkyl halides and sodium metal is called :
Answer» WURTZ reaction kolbe's reaction clemensen's reaction Finkelstein reaction Answer :A

Discussion

24322.	The reaction between alcohol and conc. H_2SO_4 at 413 K gives
Answer» DIETHYL ether isopropyl ALCOHOL diethyl alcohol ethene Answer :A

Discussion

24323.	The reaction between A to B is not feasible but on changing entropy through a series of steps : A to C to D to B DeltaS (A to C) = 50 eu DeltaS (C to D) = 30 eu DeltaS(B to D) = 20 eu. The entropy change for A to B would be :
Answer» 100 EU 60 eu `-60eu ` `-100 eu` ANSWER :B

Discussion

24324.	The reaction between A and B is first order w.r.t. A and zero order w.r.t. B. Fill in the blanks in the following table : {:("Experiment",,,[A]//"mol L"^(-1),,,[B]//"mol L"^(-1),,,"Initialrate"//"mol L"^(-1)min^(-1)),(I,,,0.1,,,0.1,,,2.0xx10^(-2)),(II,,,-,,,0.2,,,4.0xx10^(-2)),(III,,,0.4,,,0.4,,,""-),(IV,,,-,,,0.2,,,2.0xx10^(-2)):}
Answer» Solution :The rate expression will be : Rate `=k[A]^(1)[B]^(0)=k[A]` For EXPT. I, `2.0xx10^(-2)=MOLL^(-1)" min"^(-1)=k(0.1" M")" or "k=0.2" min"^(-1)` For expt. II, `4.0xx10^(-2)mol L^(-1)" min"^(-1)=0.2" min"^(-1)[A]" or "[A]=0.2" mol L"^(-1)` For expt. III, Rate `=(0.2" min"^(-1))(0.4" mol L"^(-1))=0.08" mol L"^(-1)" min"^(-1)` For expt. IV, `2.0xx10^(-2)" mol L"^(-1)" min"^(-1)=0.2" min"^(-1)[A]" or "[A]=0.1" mol L"^(-1)`

Discussion

24325.	The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table.
Answer» Solution :the rate EQUATION for the reaction is : r`=k[A]^(1)[B]^(0)` i) Comparing EXPERIMENTS I and II. `2.0 xx 10^(-2) = k[0.1]^(1)[0.1]^(0)` `4.0 xx 10^(-2) = k[x]^(1)[0.2]^(0)` Dividing eqn.(ii) by eqn. (i), `(4.0 xx 10^(-2))/(2.0 xx 10^(-2)) = (k[x]^(1)[0.2]^(0))/(k[0.1]^(1)[0.1]^(0)) , 2 = x/0.1 or x = 2xx 0.1= 0.2 M` Thus, concentration of A in experiment II is 0.2 M ii) Comparing experiments II and III. When the concentration of A is made double, the reaction rate will also becomes twice. `therefore` Rate of reaction in experiment III is `8.0 xx 10^(-2)` iii) Comparing experiments I and IV, Since, the reaction rates are the same in both the experiments, the molar concentration of A in experiment IV must be the same as in experiment I. i.e., it must be 0.1 M.

Discussion

24326.	The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table :
Answer» Solution :The RATE expression will be : `""` Rate `=K[A]^(1)[B]^(0)=k[A]` From experiment I,`""2.0xx10^(-2)"mol L"^(-1)"min"^(-1)= k(0.1m) or k=0.2 "min"^(-1)` From experiment II, `""4.0xx10^(-2)"mol"^(-1)L^(-1)"min"^(-1)=(0.2 "min"^(-1))[A] or [A]=0.2 "mol L"^(-1)` From experiment III, `"Rate"=(0.2"min"^(-1))(0.4"mol L"^(-1)) or " Rate"=0.08"mol L"^(-1)"min"^(-1)` From Experiment IV, `""2.0xx10^(-2)"mol L"^(-1) "min"^(-1)=0.2"min"^(-1)[A] or [A]-0.1"mol L"^(-1)`

Discussion

24327.	The reaction AsH_(3) (g) rarr As(s) +(3)/(2) H_(2)(g) was followed at constant volume at 310°C by measuring the gas pressure at intervals Show from the following figures that reaction is of first order. Time (in hrs) 057.510 Total pressure (in mm) 758827856882
Answer» SOLUTION :FIRST ORDER

Discussion

24328.	The reaction at cathode during the electrolysis of aqueous solution of NaCI in Nelson cell is :
Answer» `2CI^-rarrCI_2 + 2E` `2H^+ +2e rarrH_2` `2OH^- rarrH_2+O_2+2e` `NA^+ +erarrNa` ANSWER :B

Discussion

24329.	The reaction at anode in NICAD cell is
Answer» `NiO_(2) + 2 OH^(-) to Ni(OH)_(2) + 2e^(-) + H_(2)O` `Cd to Cd^(2+) + 2e^(-)` `Cd + 2OH^(-) to Cd (OH)_(2) + 2e^(-)` `Ni to Ni^(2+)+ 2e^(-)` Solution :At anode in NICAD CELL, REACTION is `Cd to Cd^(2+)+ 2e^(-)`

Discussion

24330.	The reaction at anode in a fuel cell is
Answer» `PB + SO_(4)^(2-) to Pb SO_(4) + 2 e^(-)` `2H_(2) + 4 OH^(-) to 4 H_(2)O +4e^(-)` `O_(2) + 2 H_(2)O + 4e^(-) to 4OH^(-)` `2H_(2) + O_(2) to 2H_(2)O` Solution :It is a FACT .

Discussion

24331.	The reaction A+B toC has zero order. Write its rate equatons.
Answer» SOLUTION :RATE = `K[A]^(0)[B]^(0)`.

Discussion

24332.	The reaction, Aroverset(+)(N_(2))Cl^(-) overset(Cu//HCl)to ArCl+N_(2)+CuCl is names as_____
Answer» SANDMEYER reaction Gattermann reaction Claisen reaction Carbylamine reaction Answer :B

Discussion

24333.	The reactionAroverset(+)N_(2)Cl^(-)overset(Cu//HCl)to ArCl +N_(2) + CuClis named as _____
Answer» SANDMEYER REACTION Gatterman reaction Hofmann bromamie degradation reaction CARBYLAMINE reaction ANSWER :B

Discussion

24334.	The reaction Aroverset(+)N_(2)Cl^(-)overset(Cu//HCl)rarr ArCl+N_(2)+CuCl is named as :
Answer» SANDMEYER reaction Gattermann reaction Claisen reaction Carbylamine reaction. Answer :B

Discussion

24335.	The reaction A +B to C has zero order. What is the rate equation ?
Answer» SOLUTION :`(dx)/(dt)=k[A]^(0)[B]^(0)`

Discussion

24336.	The reaction ArN_(2)^(+)Cl^(-) overset(Cu//HCl)(rarr)ArCl+N_(2)+CuCl is named as …………….
Answer» SANDMEYER reaction Gatterman reaction Claisen reaction Carbylamine reaction Answer :B

Discussion

24337.	The reaction A+2Bto product, is first order in A and second order in B. If t_(1//2) w.r.t. A is same as the t_(1//2) of the reaction.
Answer» `[A]_("INITIAL")GT[B]_("Initial")` `[A]_("Initial")=[B]_("Initial")` A is the limiting reactant B is the limiting reactant Answer :C

Discussion

24338.	The reactionAlcohol +HCl hArr lakyl halide +H_(2)O for completion of reaction is used
Answer» anhy `ZnCl_(2)` conc. `H_(2)SO_(4)` EXCESS of water `CaCl_(2)` Answer :A

Discussion

24339.	The reaction A + B rarr C follows first order kinetics with respect to A and second order kinetics with respect to B. What is the overall order of the reaction ?
Answer» SOLUTION :THREE or 3.

Discussion

24340.	The reaction and mechanism involved in the formation of the compound (I) form (H), respectively, are:
Answer» Clasisen REARRANGEMENT REACTION, FREE RADICAL mechanism Claisen rerrangement reaction, CONCERTED mechanism Clasien-Schmide reaction, free radical mechanism Claisen-Schmidt reaction, concerted mechanism Solution :

Discussion

24341.	The reaction A+B rarr C +DDeltaH =30 kJ mol^(-1) should have activation energy
Answer» a) 30 kJ `MOL^(-1)` B) `-30 "kJ mole"^(-1)` c) ` gt 30 "kJ mole"^(-1)` d) `le 30 "kJ mol"^(-1)` Answer :C

Discussion

24342.	The reaction A(g)toB(g)+2C(g) is a first order reaction with rate constant 2.772xx10^(-3)s^(-1), Starting with 0.1 mole of A in 2 litre vessel, find the concentration of A after 250 secwhen the reaction is allowed to take place at constant pressure and at 300 K?
Answer» `0.0125 M` `0.025 M` `0.05 M` NONE of these Answer :A

Discussion

24343.	The reaction A(g) to 2B(g) + C(g) follows first order kinetics. The reaction is started with pure 'A' in a rigid closed vessel maintained at constant temperature. After 10 s, a pin hole is developed in the vessel. If the molar ratio of gases 'A' and 'B' coming out initially is 1 : 2, the rate constant of reaction (in s^(-1) ) is (Molar masses of A, B and C are 16, 4 and 8 g/mol, respectively, ln 2 = 0.7, ln 3 = 1.1)
Answer» SOLUTION :`{:(,A,to,2B,+,C),(t=0,a mol, ,0, ,0),(t=10"sec",(a-x) mol, ,2x mol, ,x mol):}` Now, `(r_A)/(r_B) = (P_A)/(P_B) sqrt((M_B)/(M_A)) implies 1/2 = (a-x)/(2x) cdot sqrt(4/16)` `implies x = a/3` Now, `K = 1/t cdot 1N a/(a-x) = 1/(10 "sec")cdot 1n(a)/((2a)/(3))`.

Discussion

24344.	The reaction ._(5)B^(8) rarr ._(4)Be^(8) + ._(1)e^(0) is due to
Answer» Loss of `ALPHA`-particles Loss of `beta-`particles Loss of positron Electron loss Solution :The emission of positron TAKES PLACES

Discussion

24345.	The reaction A_((g)) + B_((g))hArrC_((g)) + D_((g)) proceeds to right hand side upto 99.9%. The equilibrium constant K for the reaction will be -
Answer» `10^(4)` `10^(5)` `10^(6)` `10^(8)` ANSWER :C

Discussion

24346.	The reaction A+2B hArr 2C+Dwas situated using an initial concentration of B which was 1.5 times that of A But the equilibrium concentration ofA and C were found to be equal . Then what is the K_c for the equilibrium?
Answer» 4 8 6 0.632 Answer :A

Discussion

24347.	The reaction, A(g)+2B(g) to C(g)+D(g) is an elementary process. In an experiment, the initial partial pressure of A and B are P_(A)=0.60 and P_(B)=0.80 atm. When P_(C )=0.2 atm, the rate of reaction relative to the initial rate is
Answer» `1//48` `1//24` `9//16` `1//6` ANSWER :D

Discussion

24348.	The reaction : A(aq) rarr Products, occur 0.01% in 20 milliseconds when the initial concentration of 'A' was 0.4 M and 80 milliseconds when the initial concentration of 'A' was 0.2 M. The order of reaction is :
Answer» 0 1 2 3 Answer :D

Discussion

24349.	The reaction:
Answer» `CH_2Br-CH_2Br` `CHBr_2-CHBr_2` `CHBr-CHBr` None Answer :D

Discussion

24350.	The reaction A to B follows first order kinetics . The time taken for 0.8 mole of A to produce 0.8 mole of A to produce 0.6 mole of B is 1 hour . What is the time taken for conversion of 0.9 mole of A to produce to 0.675 mole of B
Answer» 2HOURS 1 hour 0.5 hour 0.25 hour SOLUTION :`k = (2.303)/(t)` log `(0.8)/(0.6) = 2.303` log `(4)/(3)` `t = (2.303)/(k)` log `(0.9)/(0.675) = (2.303)/(k) "log" (4)/(3) ` , t = 1 hour .

Discussion

Explore topic-wise InterviewSolutions in .

The reaction between H_(2)(g)" and "O_(2)(g) is highly feasible yet allowing the gases to stand at room temperature in the same vessel does not lead to the formation of water. Explain.

The reaction between H_(2(g)) and O_(2(g)) is highly feasible yet allowing the gases to satnd at room temperature in the same vessel does not lead to the formation of water .Explain.

The reaction between H_(2(g)) and Icl_((g)) occurns in thefollowing steps : (i) H_(2)+ICl rarr HI+HCl (ii) HI+ICl rarr I_(2)+HCl The reaction intermediate in the reaction is

The reaction between H_(2(g)) and ICI_((g)) occurs in the following steps : i) H_2+ ICl to HI +HCl ii) HI + IClto I_2+ HCl The reaction intermediate in the reaction is

The reaction between gaseous NH_(3) and HBr produces the white solid NH_(4)Br. Suppose that NH_(3) and HBr are introduced simultaneously into the opposite ends of an open tube that is 1 metre long. Where would you expect the white solid to form ?

The reaction between Ferric chloride and potassium thio cyanate solution gives a blood red coloured coordination compound as ……………

The reaction between excesss of C_2H_5OH and H_2 SO_4 at 140^@C gives

The reaction between ethyl bromide and sodium in dry ether to form butane is called:

the reaction between cyanamide NH_(2)CH(s) and oxygen was allowed to complete and DeltaU at 300 K was observed to be -743 kJ mol ^(-1) . The value of DeltaHat 300 K for the combustion reaction NH_(2) CN(s)+3/2 O_(2)(g) to N_(2)(g) + CO_(2)(g) + H_(2)O(l)would be

The reaction between chloral and chlorobenzene in H_(2)SO_(4) yields:

The reaction between copper and hot conc H_2SO_4 gives:

The reaction between CH_3 COCl and KCN followed by hydrolysis yields

The reaction between C_(6)H_(5)NH_(2) and chloroform and a few drops of alcoholic KOH is known as:

The reaction between C_2H_5ONa + C_2H_5Ito give C_2H_5OC_2H_5 is called

The reaction between Benzaldehyde and methyl amine takes place in a very narrow pH range. For the above reaction optimum pH is

The reaction between benzene diazonium chloride and benzene in the presence of NaOH is………..

The reaction between Aniline and Nitrous acid at very low temp (0 ^(@)C) gives which product ?

The reaction between an alcoholand an acid with the elimination of water molecules is called

The reaction between an alcohol and an acid with the elimination of water molecule is called

The reaction between an alcohol and an acid is known as :

The reaction between alkyl halides and sodium metal is called :

The reaction between alcohol and conc. H_2SO_4 at 413 K gives

The reaction between A to B is not feasible but on changing entropy through a series of steps : A to C to D to B DeltaS (A to C) = 50 eu DeltaS (C to D) = 30 eu DeltaS(B to D) = 20 eu. The entropy change for A to B would be :

The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table.

The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table :

The reaction AsH_(3) (g) rarr As(s) +(3)/(2) H_(2)(g) was followed at constant volume at 310°C by measuring the gas pressure at intervals Show from the following figures that reaction is of first order. Time (in hrs) 057.510 Total pressure (in mm) 758827856882

The reaction at cathode during the electrolysis of aqueous solution of NaCI in Nelson cell is :

The reaction at anode in NICAD cell is

The reaction at anode in a fuel cell is

The reaction A+B toC has zero order. Write its rate equatons.

The reaction, Aroverset(+)(N_(2))Cl^(-) overset(Cu//HCl)to ArCl+N_(2)+CuCl is names as_____

The reactionAroverset(+)N_(2)Cl^(-)overset(Cu//HCl)to ArCl +N_(2) + CuClis named as _____

The reaction Aroverset(+)N_(2)Cl^(-)overset(Cu//HCl)rarr ArCl+N_(2)+CuCl is named as :

The reaction A +B to C has zero order. What is the rate equation ?

The reaction ArN_(2)^(+)Cl^(-) overset(Cu//HCl)(rarr)ArCl+N_(2)+CuCl is named as …………….

The reaction A+2Bto product, is first order in A and second order in B. If t_(1//2) w.r.t. A is same as the t_(1//2) of the reaction.

The reactionAlcohol +HCl hArr lakyl halide +H_(2)O for completion of reaction is used

The reaction A + B rarr C follows first order kinetics with respect to A and second order kinetics with respect to B. What is the overall order of the reaction ?

The reaction and mechanism involved in the formation of the compound (I) form (H), respectively, are:

The reaction A+B rarr C +DDeltaH =30 kJ mol^(-1) should have activation energy

The reaction A(g)toB(g)+2C(g) is a first order reaction with rate constant 2.772xx10^(-3)s^(-1), Starting with 0.1 mole of A in 2 litre vessel, find the concentration of A after 250 secwhen the reaction is allowed to take place at constant pressure and at 300 K?

The reaction ._(5)B^(8) rarr ._(4)Be^(8) + ._(1)e^(0) is due to

The reaction A_((g)) + B_((g))hArrC_((g)) + D_((g)) proceeds to right hand side upto 99.9%. The equilibrium constant K for the reaction will be -

The reaction A+2B hArr 2C+Dwas situated using an initial concentration of B which was 1.5 times that of A But the equilibrium concentration ofA and C were found to be equal . Then what is the K_c for the equilibrium?

The reaction, A(g)+2B(g) to C(g)+D(g) is an elementary process. In an experiment, the initial partial pressure of A and B are P_(A)=0.60 and P_(B)=0.80 atm. When P_(C )=0.2 atm, the rate of reaction relative to the initial rate is

The reaction : A(aq) rarr Products, occur 0.01% in 20 milliseconds when the initial concentration of 'A' was 0.4 M and 80 milliseconds when the initial concentration of 'A' was 0.2 M. The order of reaction is :

The reaction:

The reaction A to B follows first order kinetics . The time taken for 0.8 mole of A to produce 0.8 mole of A to produce 0.6 mole of B is 1 hour . What is the time taken for conversion of 0.9 mole of A to produce to 0.675 mole of B