94420 + Interview Questions in Chemistry in Class 12

1.	If K_(sp) of MOH is 1xx10^(-10), then pH of its aqueous solution will be :
Answer» 3 6 9 12 Answer :C

Discussion

2.	If K_(sp) for HgSO_(4) is 6.4 xx 10^(-5), then solubility of the salt is
Answer» `8 XX 10^(-3)` `8 xx 10^(-6)` `6.4 xx 10^(-5)` `6.4 xx 10^(-3)` SOLUTION :`HgSO_(4)` of `K_(sp) = S^(2)` `S = sqrt(K_(sp)) , S = sqrt(6.4 xx 10^(-5)) , S = 8 xx 10^(-3)` m/l.

Discussion

3.	IfKlt1.0, what will be the value of DeltaG^(@) of the following
Answer» `1.0` Zero Negative Positive Solution :`DELTAG^(@)=-RT LNK`. When `K LT 1.0, DeltaG^(@)=+ve`.

Discussion

4.	If K_p< K_c and K_p=K_c then deltan are _____ and _____ respectively.
Answer» ANSWER :NEGATIVE , ZERO

Discussion

5.	If K_(c) is the equlibrium constant for the formation of KH_(3). the dissociation constant of ammonia under the same temperaturee will be
Answer» `K_(c)` `sqrtK_(c)` `K_(c)^(2)` `1//K_(c)` Solution :`NH_(3)hArr1/2N_(2) +3/2H_(2)` `K_(c)=([N_(2)]^(1//2)[H_(2)]^(3//2))/(NH_(3))and 1/2N_(2)+3/2H_(2)hArrNH_(3)` `K_(c)=([NH_(3)])/([N_(2)]^(1//2)[H_(2)]^(3//2))`

Discussion

6.	If K_(f) for water is 1.86^(@)C"mol"^(-1),a 0.1 m solution of urea in water will have the freezing point of
Answer» `0.186^(@)C` `1.86^(@)C` `-0.186^(@)C` `-0.372^(@)C` Solution :`DeltaT_(F)=K_(f)XX m=1.86xx0.1=0.186` FREEZING point of solution `=0-0.186` `= - 0.186^(@)C`

Discussion

7.	If K_(c) for the reaction Cu_((aq))^(2+) + Sn_((aq))^(2+) to Sn_((aq))^(4+) + Cu_((s)) at25^(@) Cis represented as y xx 10^(6) then find the value of y . (Given : E(Cu^(2+) \|Cu)^(@) = 0.34 V , E_(Sn^(4+)\|Sn^(2+))^(@) = 0.15V )
Answer» Solution :`E_("CELL")^(0)=(0.059)/(2) log KC , (0.34 - 0.15) = (0.059)/(2) log kc , log kc= (2(0.34-0.15))/(0.059) , kc = 6 xx 10^(6)`

Discussion

8.	If K_(c) = 7.5 ×x 10^(-9) at 1000 k for the reaction N_(2)(g) + O_(2)(g)hArr2NO(g), what is K_(c) at 1000 K for the reaction 2NO(g)hArrN_(2)(g) + O_(2)(g) ?
Answer» ANSWER :`1.3xx10^(8)`

Discussion

9.	If K_Bis the Boltzmann constant then the quantity (PV//K_B T)represents the:
Answer» NUMBER of molecules of the gas. mass of the gas number of MOLES of the gas. translational energy of the gas Solution :`PV = nRT` `N= (PV)/(RT)` no. of molecules =` N_A = (PV)/(RT)` `=((PV)/(k_B T)), (k_B = (R)/(N_A))`= Boltzmann constant.

Discussion

10.	If kappa is the specific conductivity of a solution with volume V containing 1 g eq of the electrolyte and wedge is the equivalent conductivity, then kappa,wedge and V are related as_____.
Answer» SOLUTION :`wedge=kappaxxV`

Discussion

11.	If K_(a_(1)) and K_(a_(2)) of sulphuric acid are 1xx10^(-2) and 1xx10^(-6) respectively, then concentration of sulphate ions in 0.01 M H_(2)SO_(4) solution will be :
Answer» `1XX10^(-2)` `0.01xx10^(-8)` `1xx10^(-6)` `0.01xx10^(-10)` Answer :A

Discussion

12.	If K_(a_1) and K_(a_2)are the ionisation constant of H_3overset+NCHRCOOH and H_2NCHRCOO^(-), respectively the pH of the solution at the isoelectric point is
Answer» `PH=(pK_(a_1)+pK_(a_2))` `pH=(ppK_(a_1)-pK_(a_2))^(1/2)` `pH=(pK_(a_1)+pK_(a_2))^(1/2)` `pH=(ppK_(a_1)+pK_(a_2))^(2)` Solution :At a given pH, the species of AMINO acid EXISTS in equilibrium `underset"Low pH"(H_3overset+N-undersetundersetR\|CH-COOH) underset(H^+)overset(OH^-)hArr underset"Intermediate pH"(H_3overset+N-undersetundersetR\|CH-COO^-) underset(H^+)overset(OH^-)hArr underset"HighpH"(H_2NundersetundersetR\|CHCOO^-)` with `K_(a_1)=([H_3Noverset+CH(R)COO^(-)][H^(+) ])/([H_3overset+NCH(R)COOH])` `K_(a_2)=([H_2NCH(R)COO^(-)][H^+])/([H_3N^(+)CHRCOO^(-)])` Thus, `K_(a_1)K_(a_2)=([H_2NCH(R)COO^(-)][H^+]^2)/([H_3N^(+)CH(R)COOH])` As isoelectric point, `[H_2NCH(R)COO^(-)]=[H_3N^(+)CH(R)COOH]` Thus, `K_(a_1)K_(a_2)=[H^(+)]^2 ` or pH=`[pK_(a_1) + pK_(a_2)]^(1//2)`

Discussion

13.	If K_(2) and K_(2)are theionizationconsatnats of H_(3)NCHRCOOH and H_(3)overset(+)(N)CHRCOO^(-) , respectively , the pH of the solutionat theisoelectric point is .
Answer» `pH = pK_(1) + pK_(2)` `pH = (pK_(1) pK_(2))^(1//2)` `pH = (pK_(1) + pK_(2))^(1//2)` `pH = (pK_(1) + pK_(2))//2` Solution :`H_(3) overset(+)(N) UNDERSET("LOW pH")overset(R)overset(\|)(CH)COOH underset(H^(+))overset(OH^(-))(hArr) underset("Intermediate pH")(H_(3)overset(+)(N)overset(R)overset(\|)(CH)COO^(-)) underset(H^(+))overset(OH^(-))hArr H_(2)N underset("HighpH")(H_(2)N overset(R)overset(\|)CH)COO^(-)` `k_(1) =([H_(3)overset(+)NCHRCOO^(-)][H^(+)])/([H_(3) overset(+)NCHROOH]) , K_(2) = ([H_(2)NCHRCOO^(-)][H^(+)])/([H_(3) overset(+)NCHRCOO^(-)])` Thus , `K_(1)K_(2) = ([H_(2)NCHRCOO^(-)][H^(+)]^(2))/([H_(3)overset(+)NCHROOH])` At theisoelection point `[H_(2)NCR RCOO^(-)] = [H_(3)N^(+) CHRCOOH]` `k_(1)k_(2) = [H^(+)]^(2)` `2 log [H^(+)] =log K_(1) + log K_(2)` `RARR ""-2log[H^(+)] = - logK_(1)- log K_(2)` `2pH = pK_(1) + pH_(2) rArr pH= (pHk_(1) + pK_(2))//2`

Discussion

14.	If K_a for a weak acid is 10^-5. pK_b value of its conjugate base is:
Answer» 5 6 7 9 Answer :D

Discussion

15.	If K_(1)andK_(2)are the respective equilibrium constants for the two reactions :XeF_(6)(g)+H_(2)O(g)hArr XeOF_(4)(g)+2HF(g)XeO_(4)(g)+XeF_(6)(g)hArr XeOF_(4)(g)+XeO_(3)F_(2)(g)The equilibrium constant for the reaction :XeO_(4)(g)+2HF(g)hArr XeO_(3)F_(2)(g)+H_(2)O(g)will be :
Answer» `K_(1)//K_(2)^(2)` `K_(1).K_(2)` `K_(1)//K_(2)` `K_(2)//K_(1)` ANSWER :D

Discussion

16.	If K_1 and K_2 are equiliberium constant for reactions (I) and (II) respectively for , N_2 + O_2 ⇌ 2NO….(i) 1/2 N_2 + 1/2 O_2 ⇌ NO ….(ii) then :
Answer» `K_2 = K_1` `K_2 = sqrtK_1` `K_1 = 2K_2` `K_1 = (1/2) K_2` ANSWER :B

Discussion

17.	If k_(1) and k_(2)are rate constants at temperatures T_(1) and T_(2) respectivelythen according to Arrhenius equation :
Answer» `"LOG "(k_(2))/(k_(1))=(2.303R)/(E_(a))[(1)/(T_(1))-(1)/(T_(2))]` `log "(k_(2))/(k_(1))=(E_(a))/(2.303R)[(1)/T_(2)-(1)/(T_(1))]` `log "(k_(1))/(k_(2))=(E_(a))/(2.303R)[(1)/T_(1)-(1)/(T_(2))]` `log "(k_(2))/(k_(1))=(E_(a))/(2.303R)[(1)/T_(1)-(1)/(T_(2))]` Answer :B

Discussion

18.	If K_1 & K_2 be first and second ionisation constant of H_3PO_4 and K_1 gtgt K_2 which is incorrect.
Answer» `[H^(+)]=[H_(2)PO_(4)^(-)]` `[H^(+)]=sqrt((K_(1)[H_(3)PO_(4)])` `K_(2)=[HPO_(4)^(2-)]` `[H^(3)]=3[PO_(4)^(3-)]` ANSWER :A

Discussion

19.	If K_1 and K_2 are the respective equiliberium constant for the two reactions XeF_6 (g) + H_2O(g) = XeOF_4 (g) + 2HF(g) XeO_4 (g) + XeF_6 (g) ⇌ XeOF_4 (g) XeO_3F_2(g) , The equiliberium constant for the reaction,XeO_4 (g) + 2HF (g) ⇌ XeO_3F_2 + H_2O (g) is :
Answer» `K_1 K_2` `(K_1) /(K_2^2)` `(K_2)/(K_1)` `(K_1)/(K_2)` ANSWER :C

Discussion

20.	If K lt 1,0, what will be the value of DeltaG^(@)?
Answer» Zero 1 Positive Negative Solution :If `K LT 1` then `DeltaG^(@) GT 0`. Hence the VALUE of `DeltaG^(@)` is positive if `K lt 1`.

Discussion

21.	If K is dissociation constant of H_(2)O and K_(W) is ionic product of H_(2)O then which of the following is correct:-
Answer» `K LT K_(W)` `K_(W)=KXX[H_(2)O]` Both (1) & (2) None of these Answer :C

Discussion

22.	If it known that 1 out of every 4 collisions has appropriate orientation and activation energy is 2 Kcal, then % of effective collisions at 500 K as per collision theory will be :
Answer» `25e^(-2)` `E^(2)` `e^(-2)` `0.25 e^(-2)` ANSWER :A

Discussion

23.	If it safe to stir AgNO_(3) solutio with a copper spoon? Why or why not ? ltBrgt Given E_(Ag^(+)//Ag)^(@)=0.80 volt and E_(Cu^(2+)//Cu)^(@)=0.34volt.
Answer» Solution :The given values of REDUCTION potentials show that Cu is more reactive than `Ag`. Hence, Cu displaces Ag from `AgNO_(3)` solution, i.e., Cu REACTS with `AgNO_(3)` solution. Hence, it is not SAFE to STIR `AgNO_(3)` solution with copper spoon.

Discussion

24.	If it known that out every 5 collisions, 1 has appropriate orientation and activation energy is 4 Kcal then % of effective collisions at 1000 K as per collisions theory will be :
Answer» 20 `0.2e^(-2)` `100 e^(-2)` `20E^(-2)` ANSWER :D

Discussion

25.	If it is disreed to construct the following voltaic cell to have E_(cell) = 0.0860 V, what [Cl^(-)] must be present in the cathodic half cell to achieve the desired e.m.f.? Given K_(SP) of AgCl and Agl are 1.8 xx 10^(-10) and 8.5 xx 10^(-17) respectively. Ag_((s))\|Ag^(+)[Sat. Agl_((aq.))]\|\|Ag^(+)[Sat.AgCl.xMCl^(-)\|Ag_((s))]
Answer» ANSWER :`6.8 XX 10^(-4)M ;`

Discussion

26.	If it is assumed that ._(92)^(235)U decays only by emitting alpha and beta-particles, the possible product of the decay is
Answer» `._(89)^(235)Ac` `._(89)^(227)Ac` `._(89)^(230)Ac` `._(89)^(231)Ac` Solution :`n_(alpha) = (DeltaA)/(4)` (`DeltaA` change in mass no) `DeltaA` is divisible by 4 in options (B) and (d) In option (d), `n_(alpha) =1` `:. n_(beta) = DELTA Z - 2n_(alpha) = 3 - 2 =1`, which is not possible

Discussion

27.	If isotopic distribution of C-12 and C-14 is 98% and 2% respectively, then the number of C-14 atoms in 12 g of carbon is
Answer» `1032xx10^(22)` `301xx10^(22)` `588xx10^(23)` `602xx10^(23)` Solution :In 12 g of CARBON, the amount of C-14 `=12xx2//100=024g` `:.` C-14 atoms in `0.24g = (024xx602xx10^(23))/(14)` `= 103xx10^(22)` atoms.

Discussion

28.	If it is assumed that ""_(92)^(235)U decays only by emitting alpha-and beta-particles, the possible product of the decay is :
Answer» `""_(89)^(225)AC` `""_(89)^(227)Ac` `""_(89)^(230)Ac` `""_(89)^(231)Ac` ANSWER :B

Discussion

29.	If /is the fraction of collisions withst1ffident K.E. and P is the fraction of collision::, with proper orientations of colloiding molecules then according to Arrhenius equation, rate constant of a chemical reaction is equal to
Answer» `P. fe^(-E_a//RT)` `P/fe^(-E_a//RT)` `P.fxx1/(E_a//RT)` `P.A FXX e^(-E_a^2//RT)` SOLUTION :ARRHENIUS equation is `k=Ae^(-E_a//RT)"where" A= P.f`

Discussion

30.	If internuclear axis is y then pi- bond is form by-
Answer» <P>`P_(X)+P_(x)` `s+P_(x)` `P_(y)+P_(y)` `P_(x)+P_(y)` SOLUTION :`PI` bond is form by `p_(x)+p_(x)` and `p_(z)+p_(z)` orbitals

Discussion

31.	If is found that the equilibrium constant increases by factor of four when the temperature is increased from 25°C to 40°C. The value of DeltaH° is
Answer» 25.46 kJ 171.65 kJ 89.43 kJ 71.65 kJ Answer :D

Discussion

32.	If a is the length of unit cell .then which one is correct relationship :
Answer» For SIMPLE cubic lattice, RADIUS of metal atom=a/2 For bcc lattice, Radius of metal atom= `(sqrt3a)/4` For fcc lattice, Radius of metal atom =`a/(2SQRT2)` All Answer :D

Discussion

33.	If ionization enthalpy for hydrogen atom is 13.6 eV, then ionization enthalpy for He^+will be
Answer» 54.4eV 6.8eV 13.6eV 24.5eV Answer :A

Discussion

34.	If interionic distance between Na^+ and F^- ions is 2.31 Å then radii of Na^+ & F^- are :-
Answer» 1.95 Å & 1.36 Å 0.95 & 1.36Å 1.36Å & 1.98Å 1.36Å & 1.36 Å ANSWER :B

Discussion

35.	If initial concentration is reduced to its 1//4^(th) in a zero order reaction ,the time taken for half of the reaction to complete……
Answer» REMAINS same becomes 4 times becomes ONE -fourth doubles Answer :C

Discussion

36.	If initial concentration is reduced to its 1/4 th in a zero order reaction , the time taken for half of the reaction to complete
Answer» Remains same Becomes 4 TIMES Becomes one-fourth Doubles ANSWER :C

Discussion

37.	If initial concentration is doubled, the time for half-reaction is also doubled, the order of reaction is
Answer» zero first second THIRD ANSWER :A

Discussion

38.	If increase in boiling point of 1 molal glucose solution is 2K increase in freezing point of 2 molal glucose solution is also 2K. Then state the relationship of K_(b) and K_(f).
Answer» `K_(B)=1.5 K_(F)` `K_(b)=0.5 K_(f)` `K_(b)=2K_(f)` `K_(b)=K_(f)` SOLUTION :`(Delta T_(b))/(Delta T_(f))=(i XX m xx K_(b))/(i xx m xx K_(f))` `therefore (2)/(2)=(1xx1xx K_(b))/(1xx2xx K_(f))` `therefore K_(b)=2K_(f)`

Discussion

39.	If in the reaction of fluorine-19 with a neutron nitrogen-16 is formed, what is the other particle given off in the reaction ?
Answer» `""_(0)^(1)N` `""_(2)^(4)He` `""_(0)^(1)e` `""_(1)^(1)H` Answer :C

Discussion

40.	If in the reaction N_(2)O_(4)hArr2NO_(2),alpha is that part of N_(2)O_(4) which dissociates, then the number of moles at equilibrium will be
Answer» 3 1 `(1-alpha)^(2)` `(1+alpha)` Solution :`underset((1-alpha))underset(1)(N_(2)O_(4))hArrunderset(2alpha)underset(0)(2NO_(2))` total mole at EQULIBRIUM `=(1-alpha)+2alpha=1+alpha`

Discussion

41.	If, in the reaction N_(2)O_(4) harr 2NO_(2) x is that part of N_(2) O_(4) which dissociates, then the number of molecules at equilibrium will be
Answer» 1 3 `(1 + X)` `(1 + x)^(2)` Solution :No. of moles before dissociation No. of moles after dissociation `UNDERSET(1-x)underset(1)(N_(2)O_(4)) harr underset(2x)underset(0)(2NO_(2))` Total number of moles at equilibrium`= 1-x+ 2x = 1 +x`

Discussion

42.	If in the reaction N_2O_4⇌ 2NO_2,alpha is degree of dissociation of N_2O_4 Then the number of molecules at equiliberium will be :
Answer» 3 1 `(1-ALPHA)^2` `(1 + alpha)` ANSWER :D

Discussion

43.	If in the given reaction ,3I_2 + OH^- to IO_3^- + 5I^- 2 moles of iodine are taken, then the ratio of iodate and iodide ions formed in the alkaline medium is
Answer» 1 : 5 3 : 5 5 : 1 5 : 3 Answer :A

Discussion

44.	If in the fermentation of sugar in an enzymatic solution which is initially 0.12M the concentration of the sugar is reduced to 0.06M in 10h and to 0.03M in 20h, hence order ofthe reaction is
Answer» `0` `1` `2` `3` Answer :B

Discussion

45.	If in the fementation of sugar in an enzymatic solution thatis 0.12m the concentration of the sugar is reduced to 0.06m in 10h and to 0.03m in 20h. What is the order of reaction
Answer» SOLUTION :`1` `0.12m to 0.06m`, `50%`, CHANGE `t_(1//2)=10H` `0.12m to 0.03m`, `75%`, change `t_(3/4)=20h` Since `t_(3//4)=2xxt_(1//2)`. Hence order is `1`

Discussion

46.	If in diamond there is a unit cell of carbon atoms as fcc and if carbon atom is sp^(3) hybridised, what fractions of voids are occupied by carbon atom?
Answer» 0.25 tetrahedral 50% tetrahedral 25% octahderal Solution :`sp^(3)` hybbridised C-atom suggest a tetrahddral arrangement of 4 C-atoms. For fcc number of atoms (N) PER UNIT cell =4 `:.` Total available tetrahedral voidds `=2N=2xx4=8` Occupied tetrahedral VOID `=4` i.e 50% of the total.

Discussion

47.	If in future some element is discovered in group number sisteen and in period number seven then a form a non-polar and non-planar compound with florine atom, identify the correct formula-
Answer» `UohF_(2)` `UusF_(7)` `UnhF_(4)` `UuhF_(6)` Solution : `sp^(3)d^(2)`, OCTAHEDRAL `mu=0` Non-polar and Non PLANAR

Discussion

48.	If in diamond, there is a unit cell of carbon atoms as fcc and if carbon atom is sp^(3) hybridized, what fractions of void are occupied by carbon atom.
Answer» 25 % TETRAHEDRAL 50 % tetrahedral 25 % octahedral 50 % octahedral ANSWER :B

Discussion

49.	If in a standard hydrogen electrons half cell 2H^(+) (aq) + 2e to H_(2)(g), 1 atm, on-oxidation of base hydrogen ion concentration is reduced to 10^(-3) (M), then the emf will be
Answer» `+0.0591` V `0.1182` V `-0.0591` V `-0.1182` V ANSWER :C

Discussion

50.	If, in an ammonical solution, salts which produce a black precipate when H_2S is passed through themselves, may be :
Answer» A nickel salt A mercury salt A cobalt salt A LEAD saltc Solution :AMMONICAL `H_2S` soution can precipitate IV group RADICALS

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If K_(sp) of MOH is 1xx10^(-10), then pH of its aqueous solution will be :

If K_(sp) for HgSO_(4) is 6.4 xx 10^(-5), then solubility of the salt is

IfKlt1.0, what will be the value of DeltaG^(@) of the following

If K_p< K_c and K_p=K_c then deltan are _____ and _____ respectively.

If K_(c) is the equlibrium constant for the formation of KH_(3). the dissociation constant of ammonia under the same temperaturee will be

If K_(f) for water is 1.86^(@)C"mol"^(-1),a 0.1 m solution of urea in water will have the freezing point of

If K_(c) for the reaction Cu_((aq))^(2+) + Sn_((aq))^(2+) to Sn_((aq))^(4+) + Cu_((s)) at25^(@) Cis represented as y xx 10^(6) then find the value of y . (Given : E(Cu^(2+) |Cu)^(@) = 0.34 V , E_(Sn^(4+)|Sn^(2+))^(@) = 0.15V )

If K_(c) = 7.5 ×x 10^(-9) at 1000 k for the reaction N_(2)(g) + O_(2)(g)hArr2NO(g), what is K_(c) at 1000 K for the reaction 2NO(g)hArrN_(2)(g) + O_(2)(g) ?

If K_Bis the Boltzmann constant then the quantity (PV//K_B T)represents the:

If kappa is the specific conductivity of a solution with volume V containing 1 g eq of the electrolyte and wedge is the equivalent conductivity, then kappa,wedge and V are related as_____.

If K_(a_(1)) and K_(a_(2)) of sulphuric acid are 1xx10^(-2) and 1xx10^(-6) respectively, then concentration of sulphate ions in 0.01 M H_(2)SO_(4) solution will be :

If K_(a_1) and K_(a_2)are the ionisation constant of H_3overset+NCHRCOOH and H_2NCHRCOO^(-), respectively the pH of the solution at the isoelectric point is

If K_(2) and K_(2)are theionizationconsatnats of H_(3)NCHRCOOH and H_(3)overset(+)(N)CHRCOO^(-) , respectively , the pH of the solutionat theisoelectric point is .

If K_a for a weak acid is 10^-5. pK_b value of its conjugate base is:

If K_(1)andK_(2)are the respective equilibrium constants for the two reactions :XeF_(6)(g)+H_(2)O(g)hArr XeOF_(4)(g)+2HF(g)XeO_(4)(g)+XeF_(6)(g)hArr XeOF_(4)(g)+XeO_(3)F_(2)(g)The equilibrium constant for the reaction :XeO_(4)(g)+2HF(g)hArr XeO_(3)F_(2)(g)+H_(2)O(g)will be :

If K_1 and K_2 are equiliberium constant for reactions (I) and (II) respectively for , N_2 + O_2 ⇌ 2NO….(i) 1/2 N_2 + 1/2 O_2 ⇌ NO ….(ii) then :

If k_(1) and k_(2)are rate constants at temperatures T_(1) and T_(2) respectivelythen according to Arrhenius equation :

If K_1 & K_2 be first and second ionisation constant of H_3PO_4 and K_1 gtgt K_2 which is incorrect.

If K_1 and K_2 are the respective equiliberium constant for the two reactions XeF_6 (g) + H_2O(g) = XeOF_4 (g) + 2HF(g) XeO_4 (g) + XeF_6 (g) ⇌ XeOF_4 (g) XeO_3F_2(g) , The equiliberium constant for the reaction,XeO_4 (g) + 2HF (g) ⇌ XeO_3F_2 + H_2O (g) is :

If K lt 1,0, what will be the value of DeltaG^(@)?

If K is dissociation constant of H_(2)O and K_(W) is ionic product of H_(2)O then which of the following is correct:-

If it known that 1 out of every 4 collisions has appropriate orientation and activation energy is 2 Kcal, then % of effective collisions at 500 K as per collision theory will be :

If it safe to stir AgNO_(3) solutio with a copper spoon? Why or why not ? ltBrgt Given E_(Ag^(+)//Ag)^(@)=0.80 volt and E_(Cu^(2+)//Cu)^(@)=0.34volt.

If it known that out every 5 collisions, 1 has appropriate orientation and activation energy is 4 Kcal then % of effective collisions at 1000 K as per collisions theory will be :

If it is assumed that ._(92)^(235)U decays only by emitting alpha and beta-particles, the possible product of the decay is

If isotopic distribution of C-12 and C-14 is 98% and 2% respectively, then the number of C-14 atoms in 12 g of carbon is

If it is assumed that ""_(92)^(235)U decays only by emitting alpha-and beta-particles, the possible product of the decay is :

If /is the fraction of collisions withst1ffident K.E. and P is the fraction of collision::, with proper orientations of colloiding molecules then according to Arrhenius equation, rate constant of a chemical reaction is equal to

If internuclear axis is y then pi- bond is form by-

If is found that the equilibrium constant increases by factor of four when the temperature is increased from 25°C to 40°C. The value of DeltaH° is

If a is the length of unit cell .then which one is correct relationship :

If ionization enthalpy for hydrogen atom is 13.6 eV, then ionization enthalpy for He^+will be

If interionic distance between Na^​+​ and F​^- ions is 2.31 Å then radii of Na^​+​ & F​^-​ are :-

If initial concentration is reduced to its 1//4^(th) in a zero order reaction ,the time taken for half of the reaction to complete……

If initial concentration is reduced to its 1/4 th in a zero order reaction , the time taken for half of the reaction to complete

If initial concentration is doubled, the time for half-reaction is also doubled, the order of reaction is

If increase in boiling point of 1 molal glucose solution is 2K increase in freezing point of 2 molal glucose solution is also 2K. Then state the relationship of K_(b) and K_(f).

If in the reaction of fluorine-19 with a neutron nitrogen-16 is formed, what is the other particle given off in the reaction ?

If in the reaction N_(2)O_(4)hArr2NO_(2),alpha is that part of N_(2)O_(4) which dissociates, then the number of moles at equilibrium will be

If, in the reaction N_(2)O_(4) harr 2NO_(2) x is that part of N_(2) O_(4) which dissociates, then the number of molecules at equilibrium will be

If in the reaction N_2O_4⇌ 2NO_2,alpha is degree of dissociation of N_2O_4 Then the number of molecules at equiliberium will be :

If in the given reaction ,3I_2 + OH^- to IO_3^- + 5I^- 2 moles of iodine are taken, then the ratio of iodate and iodide ions formed in the alkaline medium is

If in the fermentation of sugar in an enzymatic solution which is initially 0.12M the concentration of the sugar is reduced to 0.06M in 10h and to 0.03M in 20h, hence order ofthe reaction is

If in the fementation of sugar in an enzymatic solution thatis 0.12m the concentration of the sugar is reduced to 0.06m in 10h and to 0.03m in 20h. What is the order of reaction

If in diamond there is a unit cell of carbon atoms as fcc and if carbon atom is sp^(3) hybridised, what fractions of voids are occupied by carbon atom?

If in future some element is discovered in group number sisteen and in period number seven then a form a non-polar and non-planar compound with florine atom, identify the correct formula-

If in diamond, there is a unit cell of carbon atoms as fcc and if carbon atom is sp^(3) hybridized, what fractions of void are occupied by carbon atom.

If in a standard hydrogen electrons half cell 2H^(+) (aq) + 2e to H_(2)(g), 1 atm, on-oxidation of base hydrogen ion concentration is reduced to 10^(-3) (M), then the emf will be

If, in an ammonical solution, salts which produce a black precipate when H_2S is passed through themselves, may be :

If K_p< K_c and K_p=K_c then deltan are _ and _ respectively.

If interionic distance between Na^+ and F^- ions is 2.31 Å then radii of Na^+ & F^- are :-