94420 + Interview Questions in Chemistry in Class 12

1.	At equilibrium the rate of dissolution of a solution solute in a volatile liquid solvent is ……
Answer» Less than the RATE of crystallisation Greater than the rate of crystallisation Equal to the rate of crystallisation Zero Solution :EXPLANATION : This happens as per conditions attained at EQUILIBRIUM state , i.e, rate of forward reaction (DISSOLUTION) = rate of BACKWARD reaction (crystallisation).

Discussion

2.	Which is correct?
Answer» `/_\T=0` `/_\S=0` `/_\H=0` `/_\G^0=0` SOLUTION :GENERAL CONCEPT

Discussion

3.	At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is
Answer» less than the rate of CRYSTALLISATION greater than the rate of crystallisation equal to the rate of crystallisation zero Solution :Is the CORRECT answer. The solution is saturated. In the solution, the rate of DISSOLUTION is equl to RATIO of crystallisation.

Discussion

4.	At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is …………..
Answer» LESS than the RATE of CRYSTALLISATION greater than the rate of crsystallisation equal to the rate of crystallisation zero Solution :At EQUILIBRIUM, rate of DISSOLUTION = rate of crystallisation.

Discussion

5.	At equilibrium the free energy change (Delta G) is :
Answer» `Delta G = 0` `Delta G GT 0` `Delta G lt 0` MAY have any value but is not equal to zero Answer :A

Discussion

6.	At equiliberium , the amount of HI in a 3 litre vessel was 12.8 g. Its equiliberium concentraction is :
Answer» 4.267 M 0.033 M 0.1 M 0.2 M Answer :B

Discussion

7.	At elevated temperatures, S_2 is the dominant species and is _________like O_2
Answer» SOLUTION :PARAMAGNETIC

Discussion

8.	At elevated temperature, HI decomposes according to the chemical equations: 2HI(g) to H_(2)(g) + I_(2)(g) a)Determine (i) the order of reaction and (iii) Write the rate expression. b) Calculate the rate constant and give its units.
Answer» Solution :From this data, it is QUITE evident that when (HI) is increased from 0.005 to 0.01 (made twice), rate = `(30 xx 10^(-4))/(7.5 xx 10^(-4)) =4` When (HI) is increased from 0.01 to 0.02 (made twice), rate `= (12 xx 10^(-3))/(3 xx 10^(-3)) =4` a) `therefore` ORDER of reaction=2 Rate expression, (r)=`k[HI]^(2)` b) Calculation of rate constant: For EXPT. (1), `k(0.005 mol L^(-1))^(2)=(7.5 xx 10^(-4)mol^(-1)s^(-1)` `k=(7.5 xx 10^(-4) mol L^(-1)s^(-1))/(2.5 xx 10^(-5)mol^(2)L^(-2))=30 mol^(-1)Ls^(-1)`.

Discussion

9.	At different condition nitration of phenol gives
Answer» o-nitrophenol p-nitrophenol Picric acid All of these Answer :D

Discussion

10.	At CMC, the surfactant molecules :
Answer» Dissociate Associate Become completelysoluble Decompose Answer :B

Discussion

11.	At critical micelle concentration (CMC)
Answer» the ions of surfactant molecules UNDERGO ASSOCIATION to FORM clusters the turbidity of solution INCREASES abruptly substances like grease, FATS, etc. dissolve colloidally colligative properties increase suddenly. Answer :A::B::C

Discussion

12.	At constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to:
Answer» INCREASE in AVERAGE molecular speed increased rate of COLLISIONS amongst molecules increase in molecular attraction decrease in MEAN free path Answer :A::B

Discussion

13.	At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with rise of temperature due to
Answer» 1. INCREASE in average molecular speed 2. INCREASED rate of collision amongst molecules 3. increase in molecular attraction 4. decrease in mean free PATH ANSWER :A

Discussion

14.	At constant volume at 27^(@) C, 2C_(6)H_(6)(g)+150_(2)(g) to 12CO_(2)(g)+6H_(2)O(l), Delta u=-1600 kcal 2C_(2)H_(2)(g)+5O_(2)(g) to 4CO_(2)(g)+2H_(2)O (l), Deltau=-620 kcal Calculate the heat of polymerisation of acetylene to benzene at constant pressure.
Answer» ANSWER :(-131.2 KCAL)

Discussion

15.	At constant teperature, the equlimbeijm constnt (K_(p)) for the decomposition reaction N_(2)O_(4)hArr2NO_(2) is expressed by K_(p)=(4x^(2)P)(1-x^(2)), where P = pressure, x= ectent of decomposition. Which one of the following statements is true
Answer» `K_(p)` increases with increase of P `K_(p)` increase with increase of X `K_(p)` increase with decrease of x `K_(p)` REMAINS CONSTANT with change in P and x Solution :With change of pressurr,will change in such a WAY that `K_(p)` remains a constant.

Discussion

16.	At constant volume and temperature conditions the rates of diffusion D_(A) and D_(B) of gases A and B having densities rho_(A) and rho_(B) are related by the expression
Answer» `D_(A)=[D_(B).(rho_(A))/(rho_(B))]^(1//2)` `D_(A) . [(rho_(B))/(rho_(A))]^(1//2)` `D_(A)=D_(B)((rho_(A))/(rho_(B)))^(1//2)` `D_(A)=D_(B)((rho_(B))/(rho_(A)))^(1//2)` SOLUTION :`(D_(A))/(D_(B))=SQRT((rho_(B))/(rho_(A)))` i.e. `D_(A)=((rho_(B))/(rho_(A)))^(1//2)`

Discussion

17.	At constant volume , for a fixed number of mole of a gas , the pressure of the gas increase with rise of temperature due to :
Answer» INCREASE in AVERAGE molecular speed Increase in number of mole Increase in molecular attraction Decrease in mean free path Answer :A

Discussion

18.	At constant temperture and pressure which one of the following statements is correct for the reaction ? CO(g)+ 1/2O_(2)(g) to CO_(2)(g)
Answer» `DeltaH = DELTAE` `DeltaH lt DeltaE` `DeltaH gt DeltaE` `DeltaH` is independent of PHYSICAL state of reactant Solution :As we know , `DeltaH=(- 1348.9 xx10^(3))+ 11xx2xx298=-1342.34 kcal` for the reaction , `CO(G)+1/2O_(2)(g) to CO_(2)(g)` ` Deltan=1-(1+1/2) =-1/2` `DeltaH=DeltaE-1/2 RT` `DeltaH lt DeltaE`

Discussion

19.	At constant temperature, the pressure of V mL of a dry gas was increased from 1 atm to 3 atm. The new volume will be :
Answer» 3V `V//3` `V^(3)` `2V^(3)` Solution :`p_(1) = 1 atm,p_(2)` = 3 atm, `V_(1) `= V ml, `V_(2) = ?` `p_(1) V_(1) = p_(2) V_(2)` ( at constant temperature ) `1 XX V = 3 xx V_(2)` or `V_(2) = V//3`

Discussion

20.	At constant temperature, the equilibrium constant (K_(p)) for the decomposition reaction, N_(2)O_(4)iff2NO is expressed by K_(p)=((4x^(2)P))/((1-x^(2))), where P = pressure, x = extent of decomposition. Which one of the following statements is true?
Answer» `K_(p)` increases with increase of P `K_(p)` increases with increase of x `K_(p)` increases with DECREASE of x `K_(p)` remains constant with change in P and x Solution :`K_(p)` is temperature dependent only. By CHANGING P or x equilibrium shifts as per LE Chatelier.s principle, but after some time it establishes a new state of equilibrium at which `K_(p)` is MAINTAINED constant.

Discussion

21.	At constant temperature, the equilibrium constant (K_(p)) for the decomopsition reaction N_(2)O_(4)hArr2NO_(2) is expressed byK_(p) = ((4x^(2)P))/((1-x^(2)), where P = pressure, x = extent of decomposition. Which one of the following statement is true ?
Answer» <P>`K_p` remains constant with change in P `K_p` INCREASES with decrease of X `K_p` increases with increase of x `K_p` increases with increase of P Answer :A

Discussion

22.	At constant temperature, the equilibrium constant (K_p)for the decomposition reaction, N_2O_4 hArr 2NO_2 is expressed by K_p=4x^2P//(1-x^2) , where P = pressure and x = extent of decomposition. Which of the following statements is true?
Answer» `K_p`increases with increase in P. `K_p`increases with increase in X. `K_p`increases with decrease in x. `K_p` REMAINS constant with CHANGE in P and x. Solution :The equilibrium constant does not change with change in concentration, volume, pressure and presence of a catalyst. It CHANGES only with change in temperature of the system.

Discussion

23.	At constant temperature ,osmotic pressure of an aqueous solution of 1.5 M NH_(4)NO_(3) and x N Al_(2)(SO_(4))_(3) are equal, thenmention the value of X. ( Assume that ionic solid substances completely dissociates in the solution . )
Answer» 0.1 3.6 1.2 0.5 Solution :`n_(1)M_(1) = n_(2)M_(2)` For`NH_(4)NO_(3)`VALUES of `n_(1)` and `M_(1)` are 2 and 1.5respectively For `Al_(2)(SO_(4))_(2)n_(2) = 5 ` `:. M_(2) =( 2)/(5) xx 1.5 = 0.6 ` Normality of `Al_(2)(SO_(4))_(3)= 6 xx ` molarity `= 6 xx 0.6 = 3.6 N `

Discussion

24.	AT constant temperature, the equilibrium constant (K_p) for the decomposition reaction N_2O_4 hArr 2NO_2 is expressed by K_p=(4x^2P)//(1-x^2), where P= pressure ,x = extent of decomposition . Which one of the following statements is true ?
Answer» `K_p` INCREASES with increases of P `K_p` increases with increases of x `K_p` increases with DECREASE of x `K_p` remains CONSTANT with change in P and x Answer :D

Discussion

25.	At constant temperature in one litre vessel when the reaction 2SO_2 (g) ⇌ 2SO_2 (g) + O_2 (g) is at equiliberium the SO_2 concentration is 6.0 M, initial concentration of SO_3 is 1 M. calculate the equiliberium constant.
Answer» 2.7 1.36 0.34 0.675 Answer :D

Discussion

26.	At constant temperaturein a litre vessel , when the reaction 2SO_(3)(g) iff 2SO_(2)(g) + O_(2)(g)the SO_(2) concentration is 0.6M , initial concentration ofSO_(3) is 1M . The equilibrium constant is
Answer» 1.36 0.34 2.7 0.675 Answer :D

Discussion

27.	At constant temperature and volume, X decomposes as 2" X "(g) to 3" Y "(g)+2" Z "(g). P_(x) is the partial pressure of X. {:("Observation No.",,,"Time (in minutes)",,,P_(x)("in mm of Hg")),(1,,,0,,,800),(2,,,100,,,400),(3,,,200,,,200):} (i)What is the order of reaction with respect with respect of X ? (ii) Find the time for 75% completion of the reaction. (iii) Find the total pressure when pressure of X is 700 mm of Hg.
Answer» Solution :(i) As pressure of X is changing with time, it cannot be a zero order REACTION. LET us now check it for 1st order. `{:("At",,,t=100" min,",,,k=(2.303)/(100)log""(P_(0))/(P_(t))=(2.303)/(100)log""(800)/(400)=6.932xx10^(-3)"min"^(-1)),("At",,,t=200" min,",,,k=(2.303)/(200)log""(800)/(200)=(2.303)/(800)log4=6.932xx10^(-3)"min"^(-1)):}` As k comes out to be constant, hence it is a reaction of 1st order. (II) `t_(75%)=(2.303)/(k)log""(100)/(100-75)=(2.303)/(6.932xx10^(-3)"min"^(-1))log4=200" min".` (iii) `2X(g) to 3" Y"(g)+2" Z"(g)` `{:("Initial Pressure",,,800" mm",,,0,,,0),("Pressure after time t",,,800-2" p",,,3" p",,,2" p"):}` When pressure of X is 700 mm, `800-2" p"=700" or "p=50" mm"` Total pressure `=(800-2" p")+3" p"+2" p"=800+3" p"=800+3xx50=950" mm"`

Discussion

28.	At constant temperature , if pressure increases by 1% , the percentage decrease of volume is :
Answer» `1%` `100 //101%` `1//101%` `1//100%` Solution :Let `P_(1) = 100` mm Hg INCREASE in PRESSURE `= 100 XX ( 1)/( 100) = 1 ` `p_(2) = 100 +1 = 101 mm Hg ` `V_(1) = V` and `V_(2) = ?` `p_(1) V_(1) = p _(2) V_(2)` or `V_(2) = ( p_(1) V_(1))/(p_(2)) = ( 100 xx V )/( 101) = ( 100)/( 101) V ` Decrease in volume`= ( V - ( 100)/( 101) V )/( V )` ` = V ( 1 - (100)/( 101))/( V ) = ( 1)/( 101)%`

Discussion

29.	At constant temperature , in a given mass of an ideal gas
Answer» The RATIO of pressure and volume ALWAYS remains constant Volume always remains constant Pressure always remains constant The product of pressure and volume always remains constant Solution :According to BOYLE's LAW`V prop (1)/(P)` `V = ("Constant")/(P) , VP =` Constant

Discussion

30.	At constant temperature and pressure, correct order of entropy of gases for their equal moles is
Answer» `He gt NE gt Ar gt Kr gt XE` `H lt O_2 lt CO_2 lt PCI_3` `He = Ne = 0,_2lt Ar lt Kr = Xe` `O_2 = 0_3 lt N_2 lt Cl_2` Answer :2

Discussion

31.	At constant temperature and 1 atm pressure, PCl5 dissociate 2% then at what pressure PCl5 dissociate4% :- (Use PCl_(5)(g) hArrPCl_(3)(g) + Cl_(2)(g))
Answer» `1/8 ` atm `1/(16) atm` `(1)/(2) atm` `1/4 atm` Solution :`{:(PCL5 , hArr,PCl 3, + ,CL2),( 1,,0,,0),(1-alpha , ,alpha ,, alpha ):}` `KP=( alpha^(2))/((1-alpha ))xx[(p)/((1+alpha))]^(1)` `KP= (alpha^(2) P)/(1-alpha ^(2)) ~~- alpha ^(2)P ` ` alpha_(1) ^(2)P_(1)= alpha _(2) ^(2)P_(2) ` `( 0.02 ) xx 1 = ( 0.04 ) ^(2).Pa` `impliesP2= 0.25atm ` `=(1)/(4) atm`

Discussion

32.	At constant temperature and pressure, which of the following statement is true for the reaction.CO[g]+1/2O_2[g]-rarrCO_2[g]
Answer» `/_\H=/_\E` `/_\Hlt/_\E` `/_\Hgt/_\E` `/_\H is INDEPENDENT to PHYSICAL state. Answer :B

Discussion

33.	At constant temp. the osmotic pressure (pi) and the molarity (M) of the solution are related as
Answer» `PI prop M` `pi prop 1/M` `pi prop SQRT(M)` `piprop 1/sqrt(M)` Solution :A/c to van't Hoff's equation, `:. pi prop M` `pi=CRT, C=Molarity`

Discussion

34.	At constant T and P, which one of the following statements is correct for the reaction, CO(g) +(1)/(2)O_(2)(g) rarrCO_(2)(g)
Answer» `DeltaH` is independent of the PHYSICAL state of the reactants of that compound `DeltaH GT DELTAE` `DeltaH lt DeltaE` `DeltaH = DeltaE` Solution :`Deltan_(g)=1-(3)/(2)=(-1)/(2)`,As `Deltan_(g)` is negative, thus `DeltaH lt DeltaE`.

Discussion

35.	At constant pressure, the heat of formation of a compound is not dependent on temperature, when
Answer» `DELTA C_P = 0` `Delta C_V = 0` `Delta C_P gt 0` `Delta C_P lt 0` Solution :ACCORDING to kirchhoff.s equation `Delta H_2 = Delta H_1+ Delta C_P (Delta T)` when `Delta C_P = 0` then `Delta H` does not DEPEND on temperature .

Discussion

36.	At constant T and P which one of the following statements is correct for the reaction : CO(g) + (1)/(2) O_(2)(g) rarr CO_(2)(g)
Answer» `Delta H = Delta U` `Delta H lt Delta U` `Delta H GT Delta U` `Delta H` is INDEPENDENT of the PHYSICAL state of the REACTANT of that compound Answer :B

Discussion

37.	At constant P and T which statement is correct for the reaction, CO(g)+1//2O_2(g)rarrCO_2(g):
Answer» `triangleH=triangleU` `triangleHlttriangleU` `triangleHgttriangleU` `TRIANGLE H` is independent for PHYSICAL state of reaction. Answer :B

Discussion

38.	At constant P and T which of the following statement is correct for, C (s) + O_(2)(g) rarr CO_(2) (g)
Answer» `DELTAH = DeltaE` `Delta H LT DeltaE` `Delta H gt DeltaE` `DeltaH` is INDEPENDENT of the physical state of reactants Answer :A

Discussion

39.	At CMC the surfactant molecules
Answer» DECOMPOSES BECOMES COMPLETELY SOLUBLE associates dissociates Answer :C

Discussion

40.	At CMC, the surfactant moleculesdecompose,become completely soluble,associate,dissociate.
Answer» decompose become COMPLETELY soluble associate dissociate Answer :C

Discussion

41.	At CMC the surfact molecules:
Answer» decompose associate become COMPLETELY soluble dissociáte Answer :B

Discussion

42.	At CMC, surfactant molecules
Answer» HYDROLYSE dissociate ASSOCIATE DISSOLVE competely Answer :C

Discussion

43.	At CMC (Critical Micellisation Conc.) the surface molecules
Answer» Associate Dissociate Decompose Become COMPLETELY soluble. Answer :A

Discussion

44.	At certain temperature, vapour pressure of pure element A and B has 108 and 36 torr respectively. If solution has equal mole of A and B elements, then vapour pressure of solution is …….
Answer» 144 torr 72 torr 90 torr 125 torr Answer :B

Discussion

45.	At certain temperature, the r.m.s. velocity for CH_4gas molecules is 100 m/sec. This velocity for SO_2 gas molecules at same temperature will be
Answer» 400 m/sec 200 m/sec 50 m/sec 25 m/sec Answer :C

Discussion

46.	At certain temperature, the solution of benzene in toulene exihibits the vapour pressure (in m bar) representes as P= 150x + 65, where 'x' is mole fraction of benzene, the vepour pressure of pure benzene is
Answer» 150 m BAR 65 m bar 90 m bar 215 m bar ANSWER :D

Discussion

47.	At certain temperature a solution of 3mol of a liquid A(P^(0)=500 torr) and 1 mol of liquide B(P^(0)=340 torr) has a vapour pressure of 435 torr , we can conclude that
Answer» a solution of 5 mL of A and 50 mL of B must have a volume of 100 mL . the solution shows negative DEVATION from Raoult's law on mixing the two LIQUIDS heat be given out so as to OBTAIN solution at the same temperature entropy of mixing is zero . Answer :B::C

Discussion

48.	At certain temperature and infinite dilution , the equivalent conductances of sodium benzoate , hydrochloric acid , and sodium chloride are 240, 349 and 229 Omega^(-1) cm^(2) eq^(-1) respectively . The equivalent conductance of benzoic acid in Omega^(-1) cm^(2) eq^(-1) at the same condition is
Answer» 80 328 360 408 Solution :`Lambda_(C_(6)H_(5) COOH)^(@) = Lambda_(C_(6)H_(5) COONa)^(@) + Lambda_(HCl)^(@) - Lambda_(NACL)^(@)` `Lambda_(C_(6)H_(5) COOH)^(@) = 240 + 349 - 229` `Lambda_(C_(6)H_(5) COOH)^(@)= 240 + 349 - 229` `Lambda_(C_(6)H_(5)COOH)^(@) = 360 Omega^(-1) CM^(2) eq^(-1)`

Discussion

49.	At certain temperature 1.6% solution of an unknown substance is isotonic with 2.4 % solution of Urea. If both the solutions have the same solvent and both the solutions have same density 1 gm/cm^(3), what will be the molecular mass of unknown substance in gm/mol. [Mole mass of urea = 60 gm/mol]
Answer» 40 90 80 30 Solution :For, isotonic solution `((% w//V)/(M))_("UREA")=((%w//V)/(M))_("unknown")` `(2.4)/(60)=(1.6)/(M)` `THEREFORE M=(1.6xx60)/(2.4)=40` gram/mole

Discussion

50.	At cathode, the electrolysis of aqueous Na_(3)SO_(4) gives
Answer» `NA` `H_(2)` `SO_(3)` `SO_(2)` Solution :Calomel electrode USED asa reference electrdrodeuses `Hg_(2)Cl_(2)`.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

At equilibrium the rate of dissolution of a solution solute in a volatile liquid solvent is ……

Which is correct?

At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is

At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is …………..

At equilibrium the free energy change (Delta G) is :

At equiliberium , the amount of HI in a 3 litre vessel was 12.8 g. Its equiliberium concentraction is :

At elevated temperatures, S_2 is the dominant species and is _________like O_2

At elevated temperature, HI decomposes according to the chemical equations: 2HI(g) to H_(2)(g) + I_(2)(g) a)Determine (i) the order of reaction and (iii) Write the rate expression. b) Calculate the rate constant and give its units.

At different condition nitration of phenol gives

At CMC, the surfactant molecules :

At critical micelle concentration (CMC)

At constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to:

At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with rise of temperature due to

At constant volume at 27^(@) C, 2C_(6)H_(6)(g)+150_(2)(g) to 12CO_(2)(g)+6H_(2)O(l), Delta u=-1600 kcal 2C_(2)H_(2)(g)+5O_(2)(g) to 4CO_(2)(g)+2H_(2)O (l), Deltau=-620 kcal Calculate the heat of polymerisation of acetylene to benzene at constant pressure.

At constant teperature, the equlimbeijm constnt (K_(p)) for the decomposition reaction N_(2)O_(4)hArr2NO_(2) is expressed by K_(p)=(4x^(2)P)(1-x^(2)), where P = pressure, x= ectent of decomposition. Which one of the following statements is true

At constant volume and temperature conditions the rates of diffusion D_(A) and D_(B) of gases A and B having densities rho_(A) and rho_(B) are related by the expression

At constant volume , for a fixed number of mole of a gas , the pressure of the gas increase with rise of temperature due to :

At constant temperture and pressure which one of the following statements is correct for the reaction ? CO(g)+ 1/2O_(2)(g) to CO_(2)(g)

At constant temperature, the pressure of V mL of a dry gas was increased from 1 atm to 3 atm. The new volume will be :

At constant temperature, the equilibrium constant (K_(p)) for the decomposition reaction, N_(2)O_(4)iff2NO is expressed by K_(p)=((4x^(2)P))/((1-x^(2))), where P = pressure, x = extent of decomposition. Which one of the following statements is true?

At constant temperature, the equilibrium constant (K_(p)) for the decomopsition reaction N_(2)O_(4)hArr2NO_(2) is expressed byK_(p) = ((4x^(2)P))/((1-x^(2)), where P = pressure, x = extent of decomposition. Which one of the following statement is true ?

At constant temperature, the equilibrium constant (K_p)for the decomposition reaction, N_2O_4 hArr 2NO_2 is expressed by K_p=4x^2P//(1-x^2) , where P = pressure and x = extent of decomposition. Which of the following statements is true?

At constant temperature ,osmotic pressure of an aqueous solution of 1.5 M NH_(4)NO_(3) and x N Al_(2)(SO_(4))_(3) are equal, thenmention the value of X. ( Assume that ionic solid substances completely dissociates in the solution . )

AT constant temperature, the equilibrium constant (K_p) for the decomposition reaction N_2O_4 hArr 2NO_2 is expressed by K_p=(4x^2P)//(1-x^2), where P= pressure ,x = extent of decomposition . Which one of the following statements is true ?

At constant temperature in one litre vessel when the reaction 2SO_2 (g) ⇌ 2SO_2 (g) + O_2 (g) is at equiliberium the SO_2 concentration is 6.0 M, initial concentration of SO_3 is 1 M. calculate the equiliberium constant.

At constant temperaturein a litre vessel , when the reaction 2SO_(3)(g) iff 2SO_(2)(g) + O_(2)(g)the SO_(2) concentration is 0.6M , initial concentration ofSO_(3) is 1M . The equilibrium constant is

At constant temperature , if pressure increases by 1% , the percentage decrease of volume is :

At constant temperature , in a given mass of an ideal gas

At constant temperature and pressure, correct order of entropy of gases for their equal moles is

At constant temperature and 1 atm pressure, PCl5 dissociate 2% then at what pressure PCl5 dissociate4% :- (Use PCl_(5)(g) hArrPCl_(3)(g) + Cl_(2)(g))

At constant temperature and pressure, which of the following statement is true for the reaction.CO[g]+1/2O_2[g]-rarrCO_2[g]

At constant temp. the osmotic pressure (pi) and the molarity (M) of the solution are related as

At constant T and P, which one of the following statements is correct for the reaction, CO(g) +(1)/(2)O_(2)(g) rarrCO_(2)(g)

At constant pressure, the heat of formation of a compound is not dependent on temperature, when

At constant T and P which one of the following statements is correct for the reaction : CO(g) + (1)/(2) O_(2)(g) rarr CO_(2)(g)

At constant P and T which statement is correct for the reaction, CO(g)+1//2O_2(g)rarrCO_2(g):

At constant P and T which of the following statement is correct for, C (s) + O_(2)(g) rarr CO_(2) (g)

At CMC the surfactant molecules

At CMC, the surfactant moleculesdecompose,become completely soluble,associate,dissociate.

At CMC the surfact molecules:

At CMC, surfactant molecules

At CMC (Critical Micellisation Conc.) the surface molecules

At certain temperature, vapour pressure of pure element A and B has 108 and 36 torr respectively. If solution has equal mole of A and B elements, then vapour pressure of solution is …….

At certain temperature, the r.m.s. velocity for CH_4gas molecules is 100 m/sec. This velocity for SO_2 gas molecules at same temperature will be

At certain temperature, the solution of benzene in toulene exihibits the vapour pressure (in m bar) representes as P= 150x + 65, where 'x' is mole fraction of benzene, the vepour pressure of pure benzene is

At certain temperature a solution of 3mol of a liquid A(P^(0)=500 torr) and 1 mol of liquide B(P^(0)=340 torr) has a vapour pressure of 435 torr , we can conclude that

At certain temperature and infinite dilution , the equivalent conductances of sodium benzoate , hydrochloric acid , and sodium chloride are 240, 349 and 229 Omega^(-1) cm^(2) eq^(-1) respectively . The equivalent conductance of benzoic acid in Omega^(-1) cm^(2) eq^(-1) at the same condition is

At certain temperature 1.6% solution of an unknown substance is isotonic with 2.4 % solution of Urea. If both the solutions have the same solvent and both the solutions have same density 1 gm/cm^(3), what will be the molecular mass of unknown substance in gm/mol. [Mole mass of urea = 60 gm/mol]

At cathode, the electrolysis of aqueous Na_(3)SO_(4) gives