InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Consider following two competing first ordr reactions, `Poverset(k_(1))rarrA+B,Qoverset(k_(2))rarrC+D` if `50%` of the reaction oof P wascompleted when `96%` of Q was complete ,then the ratio `(k_(2)//k_(1))` will be :A. 4.06B. 0.215C. 1.1D. 4.65 |
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Answer» Correct Answer - D |
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| 52. |
Two consecutive irreversible fierst order reactions can be represented by `Aoverset(k_(1))(rarr)Boverset(k_(2))(rarr)C` The rate equation for A is readily interated to obtain `[A]_(t)=[A]_(0).e^(-k_(1^(t)))` , and `[B]_(t)=(k_(1)[A]_(0))/(k_(2)-k_(1))[e^(-k_(1)^(t))-e^(-k_(2)^(t))]` At what time will B be present in maximum concentration ?A. `(K_(1))/(K_(2)-K_(1))`B. `(1)/(k_(1)-k_(2))` In `k_(1))/(k_(2))`C. `(1)/(k_(2)-k_(1))` In `k_(1))/(k_(2))`D. none of these |
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Answer» Correct Answer - B |
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| 53. |
For the reaction (i) `Aoverset(k_(I))toP` (ii) `Boverset(K_(II))toQ`, following observation is made. Calculate `(k_(1))/(k_(II))`, where `k_(I)` and `k_(II)` and rate constant for the respective reaction.A. 2.303B. 1C. 0.36D. 0.693 |
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Answer» Correct Answer - D |
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| 54. |
Identify reaction type: `_(13)^(27)Al+_(1)^(2)H rarr _(13)^(28)Al+_(1)^(1)H`A. (d,p)B. (p,p)C. (p,d)D. none of these |
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Answer» Correct Answer - A |
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| 55. |
`._(23)^(28)Al+_(1)^(1)P rarr X +_(0)^(0)gamma`, type artifical radioactive reaction.A. `._(13)^(28)Al`B. `._(14)^(27)Si`C. `._(14)^(28)Si`D. none of these |
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Answer» Correct Answer - C |
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| 56. |
`Ac^(227)` has a half-life of 22 years . The decays follows two parallel paths What are the decay constant `(lambda)` for Th and Fr respectively ?A. 0.03087,0.00063B. 0.00063,0.03087C. 0.02,0.98D. None of these |
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Answer» Correct Answer - B |
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| 57. |
For the reaction `3A(g)overset(k)toB(g)+C(g)` k is `10^(-4)L//mol.min`. If [A] = 0.5M then the value of `-(d[A])/(dt)`(in `ms^(-1)` is:A. `7.5xx10^(-5)`B. `3xx10^(-4)`C. `2.5xx10^(-5)`D. None of these |
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Answer» Correct Answer - D |
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| 58. |
Reaction `A+BrarrC+D` follows rate law .`r=k[A]^(1//2)[B]^(1//2)` Starting with 1 M of A and B each. What is the time taken fro concetration of A become `0.1M`? (Given`k=2.303xx10^(-2)sec^(-1))`A. 10 secB. 100 secC. 1000 secD. 434 sec |
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Answer» Correct Answer - B |
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| 59. |
The plot of In 1/T is linear with slope of :A. `-E_(a)//R`B. `E_(a)//R)`C. `E_(a)//2.303 R`D. `-E_(a)//2.303 R` |
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Answer» Correct Answer - A |
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| 60. |
A radioactive sample has initial activity of 28 dpm 30 minutes later its activity 14 dpm . How many atoms of nuclide were present initially?A. 2800B. 1212C. 528D. 2802 |
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Answer» Correct Answer - B |
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| 61. |
If decompositon reaction `A(g)toB(g) follows first order linetics then the graph of rate of formation (R ) of B against time t will be :A. B. C. D. |
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Answer» Correct Answer - C |
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| 62. |
`A_(2)+B_(2)to2AB`, R.O.R.=`k[A_(2)]^(a)[B_(2)]^(b)` `{:(,"Initial"[A_(2)],"Initial"[B_(2)],R.O.R.(r) Ms^(-1)),(,0.2,0.2,0.04),(,0.1,0.4,0.04),(,0.2,0.4,0.08):}` Order of reaction with respect to `A_( 2)` and `B_(2)` are respectively :A. a=1,b=1B. a=2,b=0C. a=2,b=1D. None |
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Answer» Correct Answer - A |
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| 63. |
If `a` is the initial concentration of the rectant, the half life period of the reaction of `n^(th)` order is inversely proportional to :A. `a^(n-1)`B. `a^(n)`C. `a^(1-n)`D. `a^(n+1)` |
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Answer» Correct Answer - A |
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| 64. |
Rate constant for a chemical reaction taking place at 500K is expressed as `K=A. e^(-1000)` The activation energy of the reaction is :A. 100 cal/molB. 1000 kcal/molC. `10^(4)` kcal/molD. `10^(6)` kcal/mol |
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Answer» Correct Answer - B |
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| 65. |
Isodiaphers are atoms having:A. n/p sameB. p/n sameC. (n-p) sameD. (n-p) different |
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Answer» Correct Answer - C |
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| 66. |
Decomposition of `NH_(4)NO_(2)(aq` into `N_(2)(g)` and `2H_(2)O(l)` is first order reaction.A. B. C. D. |
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Answer» Correct Answer - D |
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| 67. |
The half-life of `Tc^(99)` is 6.0 hr. The total residual activity in a patient 30 hr after receiving an injection containing `Tc^(99)` must be more than 0.01 `muC_(i)`. What is the maximum activity `("in"muC_(i))` that the sample injected can have?A. 0.16B. 0.32C. 0.64D. 0.08 |
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Answer» Correct Answer - B |
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| 68. |
Reaction `AtoB` follows second order kinetics. Doubling the concentration of A wil increase the rate of formation of B by a factor of :A. `1//4`B. `1//2`C. 2D. 4 |
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Answer» Correct Answer - D |
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| 69. |
`AtoB` first order reaction A is ooptical active and B is optically inactive. A series of experiment were conducted on a solution of A `{:(,"Time",0,60 min,oo),(,"optical rotation",82^(@),77^(@),2^(@)):}` assume some imurity is present calculate the otical rotation for 5 hours.) (Given in 1.066=0.064, `e^(0.16)`=1.17)A. 60B. 30C. 20D. 120 |
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Answer» Correct Answer - A |
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| 70. |
In the following gaseous phase first order reaction `A(g) rarr 2B(g)+C(g)` initial pressure was found to be 400 mm of Hg and it changed to 1000 mm of Hg after 20min. ThenA. half life for A is 10 minB. rate constant is 0.0693 `"min"^(-1)`C. partial pressure of C at 30 min is 350 mm of HgD. total pressure after 30 min is 1100 mm of Hg |
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Answer» Correct Answer - A::B::C::D |
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| 71. |
For `A_((s))+B_((s))toC_((s))`,rate=`k[A]^(1//2)[B]^(2)`, if initial concentration of A and B are increased by factors 4 and 2 respectively, then the initial rate is changed by the factor:A. 4B. 6C. 8D. None of these |
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Answer» Correct Answer - C |
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| 72. |
What will be the order of reaction for a chemical change having `log t_((1)/(2))` vs log a? ( where a = initial concentration of rectant, `t_((1)/(2))` =half life) A. zero orderB. First orderC. Second orderD. None of these |
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Answer» Correct Answer - A |
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| 73. |
For a complex reaction `A overset(k) rarr `products `E_(a1)=180kJ //mol e,E_(a2)=80kJ//mol ,E_(a3)=50kJ//mol` Overall rate constant `k` is related to individual rate constant by the equation `k=((k_(1)k_(2))/(k_(3)))^(2//3)`. Activation energy `( kJ//mol )` for the overall reaction is `:`A. 100B. 43.44C. 150D. 140 |
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Answer» Correct Answer - D |
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| 74. |
In the decay process: `A overset(- alpha)rarr B overset(-beta)rarr C overset(-beta)rarr D`a)`A` and `B` are isodiaphersb)`A` and `C` are isotonesc)`A` and `C` are isotopesd)`B, C` and `D` are isobarsA. A and B are isobarsB. A and D are isotopesC. B,C and D are isobarsD. A and C are isotones |
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Answer» Correct Answer - B::C |
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| 75. |
For the reaction `Aunderset(k_(2)"sec"^(-1))overset(K_(1)"sec"^(-1))hArr B` following graph is given, `k_(1) =4 xx 10^([email protected])"sec"^(-1)`. Which is/are correct statement (s) (In 2=0.7 , In 8/7 =0.14) A. equilibrium constant is 4.0B. Time taken for the completion fo 50% fo equilibrium conc. Of B is 14 sec.C. Time taken for the completion of 10% of initial conc. Of A is 2.8 sec.D. Rate constant of backward reaction is `10^(-2)"sec"^(-1)` |
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Answer» Correct Answer - A::B::C::D |
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| 76. |
The half-life of first order decomposition of `NH_(4)NO_(3)` is 2.10 hr at 288 K temperature `NH_(4)NO_(3)(aq)toN_(2)O(g)+2H_(2)O(l)`. If 6.2 of `NH_(4)NO_(3)` is allowed to decompose, the required for `NH_(4)NO_(3)` to decompose 90 % is :A. 6.978 hrB. 0.319C. 0.319 hrD. None of these |
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Answer» Correct Answer - A |
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| 77. |
For the zero order reaction `AtoB+C`, initial concentration of A is 0.1 M. If [A]=0.08 M after 10 minutes,then its half-life and completion time are respectively :A. 10 min, 20 minB. `2xx10^(-3)min,4xx10^(-3)min`C. 25 min, 50 minD. 250 min, 500 min |
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Answer» Correct Answer - C |
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| 78. |
A homogenous catalytic reaction takes place through the three alternative plots A, B, and C shown in the given figure. Which one of the following indicates the relative ease with which the reaction cant take place? A. ` A gt B gt C`B. `C gt B gt A`C. `A gt C gt B`D. A=B=C |
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Answer» Correct Answer - B |
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| 79. |
For a first order homogeneous gaseous reaction `Ato 2B+C` if the total pressure after time t was `P_(1)` and after long time `(t to infty)` was `P_(infty)` then K in terms of `P_(t_(1))` `P_(infty)` t isA. `k=(2.303)/(t)log((Poo)/(Poo-P_(t)))`B. `k=(2.303)/(t)log((2Poo)/(Poo-P_(t)))`C. `k=(2.303)/(t)log((2Poo)/(3(Poo-P_(t))))`D. none of these |
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Answer» Correct Answer - C |
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| 80. |
For a partiocular reaction with initial conc. Of the rectents as `a_(1)` and `a_(2)`, the half-life period are `t_(1)` and `t_(2)` respectively. The order of the reaction (n) is given by :A. `n=1+(log(t_(2)//t_(1)))/(log(a_(2)//a_(1))`B. `n=(log(t_(2)//t_(1)))/(log(a_(2)//a_(1))`C. `n=1+(log(t_(1)//t_(2)))/(log(a_(2)//a_(1))`D. None of these |
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Answer» Correct Answer - C |
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| 81. |
The reaction ,Sucrose`overset(H^(+))rarr` Glucose `+` Fructose, take place at certain temperature while the volume of solution is maintained at 1 litre. At time zero the initial rotation of the mixture is `34^(@)`. After 30 minutes the total rotation of solutions is `19^(@)` and after a very long time, the total roation is `-11^(@) C` Find the time when solution was potically inaactive.A. 135 minB. `103.7 min`C. `38.7 min`D. 45 min |
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Answer» Correct Answer - B |
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| 82. |
For the homogenous gaseous reaction `Ato3B`, if pressure after time t was `P_(t)` and after completion of reaction, pressure was `P_(oo)` then select correct relationA. `k=(1)/(t)"in"((P_(oo))/(3(P_(oo)-P_(t))))`B. `k=(1)/(t)"in"((2P_(oo))/((P_(oo)-P_(T))))`C. `k=(1)/(t)"in"((3P_(oo))/(2P_(oo)-P_(t)))`D. `k=(1)/(t)"in"((P_(oo))/(3(P_(oo)-P_(T))))` |
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Answer» Correct Answer - D |
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| 83. |
The hydrolysis of sucrose was studied with the help of calorimeter and following data were `{:(,"Collected time (min.)",:0,70,oo),(,"observed rotation (degrees)",:44,16.5,-11):}` the time taken when reaction mixture wil be optically inactive ? (Given : In 2=0.7,in 3=1.1, in 5=1.6)A. 16 minB. 69.47 minC. 160 minD. None of these |
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Answer» Correct Answer - C |
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| 84. |
Above given question, the value of rate constant for appearance of AB(g) is :A. `2.5xx10^(-4)`B. `2.5xx10^(-2)`C. `1.25xx10^(-2)`D. None of these |
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Answer» Correct Answer - B |
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| 85. |
For the first order reaction `ArarrB+C` , carried out at `27^(@)C` if `3.8xx10^(-16)%` of the reactant molecules exists in the activated state, the `E_(a)` (activation energy) of the reaction is :A. `12kJ//mol`B. `831.4kJ//mol`C. `100kJ//mol`D. `88.57kJ//mol` |
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Answer» Correct Answer - C |
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| 86. |
In the following reaction, how is the rate of appearance of the underlined Product related to the rate of disappearance of the underlined reactant ? `BrO_(3)^(ɵ)(aq) + 5underline(Br)^(ɵ)(aq) + 6H^(o+) (aq) rarr 3underline(Br_(2))(l) + 3H_(2)O(l)`A. `-(d[BrO_(3)^(-)])/(dt)=(d[Br_(2)])/(dt)`B. `-(1)/(3)(d[BrO_(3)^(-)])/(dt)=(d[Br_(2)])/(dt)`C. `-(d[BrO_(3)^(-)])/(dt)=(1)/(3)(d[Br_(2)])/(dt)`D. None of these |
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Answer» Correct Answer - C |
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| 87. |
The activation energies of the forward and backward reactions in the case of a chemical reaction are 30.5 and 45.5 KJ/mol , respectively . The reaction is:A. exothermicB. endothermicC. neither exothermicD. independent of temperature |
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Answer» Correct Answer - A |
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