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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.
| 801. |
The activation energies of the forward and reverse reaction in the case of a chemical reaction are `30.5` and `45.4 kJ//mol` respectively. The reaction is:A. ExothermicB. EndothermicC. Neither exothermic nor endothermicD. Independent of temperature |
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Answer» Correct Answer - a `E_(a_(FR))=DeltaH+E_(a_(BR))`, `:. 30.5=DeltaH+45.4` `:. DeltaH=-14.9 kJ mol^(-1)`, i.e., exothermic. |
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| 802. |
For the reaction `A rarr` Products, it is found that the rate of reaction increases by a factor of `6.25` when concentration of `A` increases by a factor of `2.5`. Calculate the order of reaction with respect to `A`. |
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Answer» Correct Answer - 2 Rate `(r ) = k[A]^(n) = k[X]^(n)` …(i) `6.25 xx r k(2.5X)^(n)` …(ii) or `6.25 xx k xx(X)^(n) = k(2.5 xxX)^(n)` `rArr ((2.5)/(X))^(n) = 6.25 rArr (2.5)^(n) = (2.5)^(n)` `:. n = 2`Correct Answer - 2 Rate `(r ) = k[A]^(n) = k[X]^(n)` …(i) `6.25 xx r k(2.5X)^(n)` …(ii) or `6.25 xx k xx(X)^(n) = k(2.5 xxX)^(n)` `rArr ((2.5)/(X))^(n) = 6.25 rArr (2.5)^(n) = (2.5)^(n)` `:. n = 2` |
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| 803. |
For the reaction `A rarr` Products, it is found that the rate of reaction increases by a factor of `6.25` when concentration of `A` increases by a factor of `2.5`. Calculate the order of reaction with respect to `A`.A. `2.5`B. `2`C. `1`D. `0.5` |
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Answer» Correct Answer - b `r=K[A]^(m), 6.25r=K[2.5A]^(m)` `:. 6.25=(2.5)^(m)` `:. M=2` |
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| 804. |
Consider figure and mark the correct option A. Activation energy of forward reaction is `E_(1) + E_(2)` and product is less stable than reactant .B. Activation energy of forward reaction is `E_(1) + E_(2)` and product is more stable than reactant.C. Activation energy of both forward and backward reaction is `E_(1) + E_(2)` and reactant is more stable than productD. Activation energy |
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Answer» Correct Answer - A Activation energy is the minimun energy required to convert reactant molecules to product molecules. Here, the energy gap between reactants and activated complex is sum of `E_(1)` and `E_(2)` `therefore` Activation energy `= E_(1)+ E_(2)` Products is less stable than reactant as energy of product is greater than the reactant. |
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| 805. |
Trimolecular reactions are uncommon becauseA. the probability of many molecules colliding at an instant is high.B. the probability of three molecules colliding at an instant is low.C. the probability of three molecules colliding at an instant is almost zero.D. the probability of three molecules colliding at an instant is high. |
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Answer» Correct Answer - C Termolecular reaction is an elementry reaction that involves three reaction molecules. Both unimolecular and bimolecular reaction are common, but temolecular reactions area. As any pool player Knows, three-body collisions are much less probable than two body collisions. Therefore, it is evident that complex reaction involving three or more molecules in the stoichiometric equation must take place in more than one step. For example, the reaction `KCIO_(3)+6FeSO_(4)+3H_(2)SO_(4)rarrKCl+3Fe_(2)(SO_(4))_(3)+3H_(2)O` which apparently seams to be of tenth order is actually a second order reaction. THis clearly shows that this reaction takes place in several steps. |
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| 806. |
Which of the following statementsw about the order of a reaction is correct ?A. A second order reaction is also bimolecularB. The order of a reaction can only be determined by experimentC. We can determine the order of a reaction from the correctly balnced net ionicv equation for the reactionD. The order of a reaction must be a positive integer |
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Answer» Correct Answer - B The reaction order with respect to a given reactant species equals the exponent of the concentration of that species in the rate law, as determined experimentally. Although reaction orders frequently have whole number value (particularly `1` or `2`), they can be fractional and zero also possible. A second order reaction is bimolecular reaction if and only if it is an elementry reaction. Similary, wecan determine the order of a reaction from the correctly balanced net ionic equation for the reaction provided the reaction is elementary in nature. |
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| 807. |
Which of the following is an example of a second order reaction ?A. A radioactive decay processB. Decomposition of hydrtogen peroxideC. Decomposition of nitrogen pentoxideD. Alkaline hydrolysis of rthyl acetate |
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Answer» Correct Answer - D Saponification of ethyl acctate ltbergt `CH_(3)COOC_(2)H_(5)NaOHrarrCH_(3)COONa+C_(2)H_(5)OH` is a second order reaction as it follows the rate law: Rate `=K[CH_(3)COOC_(2)H_(5)][OH^(-)]` A radioactive decay process follows first order kinetics. Decomposition of hydrogen peroxide `(2H_(2)O_(2)rarr2H_(2)O+O_(2))` and decompositon of nitrogen pentoxde both follow first order kinetics. `(N_(2)O_(5)(g)rarr2NO_(2)(g)+1//2O_(2)(g)` |
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| 808. |
A reaction involiving two different reactants can never be:A. bimolecular reactionB. second order reactionC. first order reactionD. unimolecular reaction |
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Answer» Correct Answer - D Molecularity is the number of molecules (or atoms or ions) on the reactant side of the chemical equation for the two different reacting molecules is a bimolecular reaction. However, a complex reaction involving two different reactants can be a second order or a first order reaction depending upon reaction mechanism. |
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| 809. |
`t_(1//4)` can be taken as the time taken for concentration of reactant to drop to `.^(3)//_(4)` of its initial value. If the rate constant for a first order reaction is `K`, then `t_(1//4)` can be written as:A. 0.10 /KB. 0.29/KC. 0.69/KD. 0.75/K |
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Answer» Correct Answer - b `t_(1//4) = (2.303)/(k) "log" (1)/(1 - (1)/(4)) = (0.29)/(k)` . |
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| 810. |
A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will:A. Remain unchangedB. TripleC. Increase by a factor of 4D. Double |
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Answer» Correct Answer - c Since `- (dx)/(dt) prop [CO]^(2)` so on doubling the concentration of CO the rate of reaction will increase by 4 times . |
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| 811. |
A reaction involiving two different reactants can never be:A. Can never be a second order reactionB. Can never be a unimolecular reactionC. Can never be a bimolecular reactionD. Can never be a first order reaction |
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Answer» Correct Answer - b Because two molecules are taking part in elementary step . |
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| 812. |
In the sequence of reaction, `L overset(k_(1))rarr M overset(k_(2))rarr N overset(k_(3))rarrO` `k_(3) gt k_(2) gt k_(1)` The rate determining step of the reaction is :A. `ArarrB`B. `BrarrC`C. `CrarrD`D. `ArarrD` |
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Answer» Correct Answer - A `Aoverset(k_(1))rarrBoverset(K_(2))rarrCoverset(k_(3))rarrD` `because" "k_(3)gtk_(2)gtk_(1)` As `k_(1)` is slowest, hence `ArarrB` is the rate of determining step of the reaction. |
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| 813. |
For the mechanism `Step1: A+Bunderset(E_(a-1))overset(E_(a-1))hArrC+D` `Step2: 2Coverset(E_(a,2)) to G+H` Step 2 is rate -determining Given the activation energies `E_(a.1)=120KJ//mol,E_(a,-1)=96KJ//mol` and` E_(a,2=196KJ//mol` Find `E_(a)` for the overall reaction. `[2A+2Bto2D+G+H]`A. 154B. 244C. 354D. none of these |
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Answer» Correct Answer - B |
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| 814. |
For the following reaction: `(CH_(3))_(3)"CCl"+H_(2)O rarr (CH_(3))_(3)COH+HCl,((dx)/(dt))=k` `[(CH_(3))_(3)"CCl"]` hence , rate determining step can be:A. `(CH_(3))_(3)"CCl" rarr (CH_(3))_(3)C^(+)+Cl^(-)`B. `(CH_(3))_(3)"CCl"+H_(2)O rarr (CH_(3))_(3)COH+HCl`C. `(CH_(3))_(3)C^(+)+H_(2)O rarr (CH_(3))_(3)COH+H^(+)`D. `H^(+) +Cl^(-) rarr HCl` |
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Answer» Correct Answer - A |
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| 815. |
Which of the following expression is correct for the rate of reaction given below ? `5Br^(-)(aq) + BrO_(3)^(-)(aq) + 6H^(+) (aq) to 3Br_(2) (aq) + 3H_(2) O(l)` .A. `(Delta[Br^(-)])/(Delta t) = 5 (Delta[H^(+)])/(Delta)`B. `(Delta[Br^(-)])/(Delta t) = (6)/(5) (Delta[H^(+)])/(Delta t)`C. `(Delta[Br^(-)])/(Delta t) = (5)/(6) (Delta [H^(+)])/(Delta t)`D. `(Delta[Br^(-)])/(Delta t) = 6 (Delta[H^(+)])/(Delta t)` |
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Answer» Correct Answer - C For the reaction, `5Br_((aq))^(-) + BrO_(3(aq))^(-) + 6H_((aq))^(+) to 3Br_(2(aq)) + 3H_(2)O_((l))` Rate `= (-1 Delta)/(5) ([Br^(-)])/(Delta t) = - (Delta[BrO_(3)^(-)])/(Delta t) = (-1)/(6) (Delta[H^(+)])/(Delta t)` `:. (Delta [Br^(-)])/(Delta t) = (5)/(6) (Delta[H^(+)])/(Delta t)` |
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| 816. |
Which of the following expression is correct for the rate of reaction given below ? `5Br^(-)(aq) + BrO_(3)^(-)(aq) + 6H^(+) (aq) to 3Br_(2) (aq) + 3H_(2) O(l)` .A. `(Delta[Br^(-1)])/(Deltat) = 5(Delta[H^(+)])/(Deltat)`B. `(Delta[Br^(-)])/(Deltat) = 6/5(Delta[H^(+)])/(Deltat)`C. `(Delta[Br^(-)])/(Deltat) = 5/6 (Delta[H^(+)])/(Deltat)`D. `(Delta[Br^(-)])/(Deltat) = 6 (Delta[H^(+)])/(Deltat)` |
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Answer» Correct Answer - C |
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| 817. |
For the reaction `A rarr `products , the graph of the fraction of `A` remaining as a function of time `(x-` axis ) is a straight line with `-ve` slpe . The order of the reaction is thereforeA. 1B. 2C. zeroD. `-1` |
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Answer» Correct Answer - 3 `A rarr ` Products `{:(t=0,a,0,,),(t=t,a-x,x,,):}` `(a-x)/(a)=` fraction of A `" "rArr" "(a-x)=a-kt" "rArr" "(a-x)/(a)=-kt` So, it is zero order. |
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| 818. |
Assertion : A catalyst increases the rate of reaction without itself undergoing any permanent chemical change. Reason : A catalyst changes the Gibbs energy `(Delta G)` of the reaction and equilibrium constant of the reaction.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
| Answer» Correct Answer - C | |
| 819. |
Which of the following statement is/are correct with respect to Arrhenius equation ?A. Rate constant linearly increases with increasing temperature and exponentially decreases with increasing activation energy.B. Rate constant exponentially increasing temperature and increasing activation energy.C. Rate constant increases exponentially with increasing temperature and decreases exponentially with increasing activation energy.D. Rate constant is unaffected by change in either temperature or activation energy. |
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Answer» Correct Answer - C |
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| 820. |
Which of the following statements is correct ?A. The rate of reaction generally decreases with passage of time as the concentration of reactants decreases in zereo order reaction.B. The rate of reaction remains same throughout the reaction in a first order reaction reaction.C. The rate of reaction increases with passage of time as the concentration of reactants decreases in a negative order reaction.D. The rate of reaction is independent of temperature change. |
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Answer» Correct Answer - C |
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| 821. |
The rate of a reaction gets doubled when the temperature change from `7^(@)C` to `17^(@)C`. By what factor will it change for the the temperature change from `17^(@)C` to `27^(@)C` ?A. `1.81`B. `1.71`C. `1.91`D. `1.76` |
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Answer» Correct Answer - C |
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| 822. |
The rate of a reaction gets doubled when the temperature changes from `7^(@)C` to `17^(@)C`. By what factor will it change for the temperature change from `17^(@)C` to `27^(@)C` ?A. `1.81`B. `1.71`C. `1.91`D. `1.76` |
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Answer» Correct Answer - C `"log"(k_(2))/(k_(1)) = (E_(a))/(2.303R)[(1)/(T_(1)) - (1)/(T_(2))]` `log 2 = (E_(a))/(2.303R)[(T_(2) - T_(1))/(T_(1)T_(2))]` `0.3 = (E_(a))/(2.303R) xx (10)/(280 xx 290)` `Ea = 0.3 xx 2.303 xx 280 xx 29 xx R` …(1) Now again `"log"(k_(2))/(k_(1)) = (E_(a))/(2.303R)[(T_(2) - T_(1))/(T_(1)T_(2))]` `"log"(k_(2))/(k_(1)) = (0.3 xx 2.303 xx 280 xx 29 R)/(2.303 R)[(10)/(290 xx 300)] = 1.905` |
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| 823. |
By increasing the temperature by `10^(@)C`, the rate of forward reaction at equilibrium is increased by a factor of `2`. The rate of backward reaction by this increase in temperatureA. remains unaffectedB. increases by a factor gretaer than twoC. decreases by a factor lesser than twoD. is also increased by a factor of two |
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Answer» Correct Answer - D At equilibrium, Rate of forward reaction `=` Rate of backward reaction. |
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| 824. |
The distribution of molecular kinetic energy at two temperature is as shown in the following graph: Which is the following concluison is/are correct?A. The number of molecules with energy `E_` or greater is proportional to the shaded area for each temperatureB. The number of molecules with energy `E_(a)` or less is proportional to the shaded area for each temperaturesC. The number of molecules with energy `E_(a)` is the mean of all temperaturesD. The graph is not according to the Maxwell-Boltzmann energy distribution law |
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Answer» Correct Answer - A It is fact |
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| 825. |
Which of the following statements `(s)` are not correct?A. A plot of `log k` versus `1//T` is linearB. A plot of `log k_(p)` versus `1//T` is nonlinear.C. A plot of `log P` versus `1//T` is linear at constant volume.D. A plot of `P` versus `1//V` is linear at constant temperature. |
| Answer» Correct Answer - B::C | |
| 826. |
Which one is correct according to the colliison theory of the rate of reaction?A. The threshold energy level is a characteristic of reaction.B. The energy of activation decreases with rise in temperature.C. The energy of absorbed activated complex is lower than ismple activated complex.D. The energy of activated complex (both activated or adsorbed) is higher than reactant or Product. |
| Answer» Correct Answer - A::C::D | |
| 827. |
The distribution of molecular kinetic energy at two temperature is as shown in the following graph: Which is the following concluison is/are correct?A. The number of molecules with energy `E_(a)` or greater is proportional to the shaded area for each temperature.B. The number of molecules with energy `E_(a)` or less is proportional to the shaded area for each temperature.C. The number of molecules with energy `E_(a)` is the mean of all temperatures.D. The graph follows the Maxwell-Boltzmann energy distribution law. |
| Answer» Correct Answer - A::D | |
| 828. |
Which of the correct exponential form of the Arrhenius equations?A. `E_(a)=Ae^(-k//RT)`B. `E_(a)=Ae^(-k//RT)`C. `k=Ae^(-RT//E_(a))`D. `k=Ae^(-E_(a)//RT)` |
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Answer» Correct Answer - D |
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| 829. |
Identify the true statement `(s)`.A. A catalyst is chemically unchanged at the end of a reaction.B. A catalyst may appear in the kinetic rate equation of the reaction.C. A catalyst will not affect the compoistion of an equilibrium mixture.D. A catalyst cannot cause a non- spontaneous `(Delta G gt 0)` reaction to proceed. |
| Answer» Correct Answer - A::B::C::D | |
| 830. |
Which of the following reaction `(s)` is `//` are of the first order ?A. The decompoistion of ammonium nitrate in an aqueous solution.B. The inverison of cane sugar in the presence of an acid.C. The acidic hydrolyiss of ethyl acetate.D. All radioactive decays. |
| Answer» Correct Answer - A::B::C::D | |
| 831. |
Which of the following plots are correctly made for the reaction `nA hArr (A)_(n)` if it obeys first order reaction?A. B. C. D. |
| Answer» Correct Answer - A::B::C::D | |
| 832. |
The desorption of gas molecules from the adsorbent surface obeys Arrhenius equations. The average adsorbed at Pt-surface at 400 K is : [Given : Pre-exponential factor, `A=1.25xx10^(8)s^(-1)`, Activation energy of desorption =16 Kcal,`e^(20)=5xx10^(8)`]A. 0.25 secB. 4 secC. 8 secD. 0.125 sec |
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Answer» Correct Answer - B |
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| 833. |
Which of the following statements is in accordance with the Arrhenius equations?A. Rate of a reaction increases with increases in temperaturesB. Rate of reaction does not change with increase in activation energy.C. Rate constant decreases exponentially with increase in temperature.D. Rate of reaction increases with decreases in activation energy. |
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Answer» Correct Answer - A::D d) Both these statements are correct. Rate of a reaction increases with the increase in temperature as well as decrease in activation energy. |
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| 834. |
Which accounts for the increase in the rate of a reaction when a catalyst is added to a chemical system?A. decrease in the enthalpy change between the reactant and productsB. An increase in the potential energy of the reactantsC. A decrease in the potential energy of the activated complexD. A decrease in the entropy of the activated complex |
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Answer» Correct Answer - C |
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| 835. |
The value of the rate constant for a gas phase reacation can be changed by increasing the :A. amount of product.B. pressure of the reactant.C. temperature of the reaction vessel.D. Times on the reaction curve. |
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Answer» Correct Answer - C |
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| 836. |
The rate of the reaction of chorine gas with a liquid hydrocarbon can be increased by all of the changes excepts one. Which change will be ineffective?A. Use UV light to dissociate the `Cl_(2)` .B. increase temperture at constant pressure.C. Divided the liquid into small dropletsD. Double the pressure by adding He gas. |
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Answer» Correct Answer - D |
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| 837. |
The rate constant for a first order reaction whose half life is 480 sec, is :A. `1.44 xx 10^(-3)s^(-1)`B. `1.44 s^(-1)`C. `0.72 xx 10^(-3)s^(-1)`D. `2.88 xx 10^(-3)s^(-1)` |
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Answer» Correct Answer - A For the first order reaction `implies " "k=(0.693)/(t_(1//2))=(0.693)/(480 sec)=1.44 xx 10^(-3)s^(-1)` |
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| 838. |
The hydrolysis of ester in alkaline medium is aA. first order reaction with molecularity 1B. second order reaction with molecularity 2C. first order reaction with molecularity 2D. second order reaction with molecularity 1 |
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Answer» Correct Answer - B Alkaline hydrolysis of ester (saponification) is a bimolecular and second order reaction. |
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| 839. |
Assertion: Glow worm shows chemiluminescence. Reason: Glow worm emits light due to oxidation protein, luciferin present in it.A. If both assertion and reason are true and reason is the correct explanation of the assertion.B. If both assertion and reason are true and reason Iis not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - A The emission of cold light during a chemical reaction is called chemiluminescence. |
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| 840. |
The rate constant is unmerically the same for three reactions of first, second and third order respectively, the unit of concentration being in moles per litre. If `R_(1), R_(2) and R_(3)` are the rates of three reactions of first, second and third order respectively aqnd K is the rate constant, which of the following relationships is valid for the three reactions.A. `R_(1)= R_(2) = R_(3)`B. `R_(1)ltT_(2)ltR_(3)`C. `R_(3)ltR_(2)ltR_(1)`D. All of these |
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Answer» Correct Answer - D Considring the rate law expressions (for a reation `ArarrB)` we have `R_(1)=k[A]` `R_(2)=k[A]^(2)` `R_(3)=k[A]^(3)` `K` is the rate constant, which is the same for the three reactions and `[A]` is the concentration of the reaction `A` in moles per litre. `[A]=1,R_(1)=R_(2)=R_(3)` `[A]= gt1,R_(3)gtR_(2)gtR_(1)` `[A]= lt 1,R_(1)=R_(2)gtR_(3)` |
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| 841. |
In a reaction `A rarr ` products , when start is made from `8.0 xx 10^(-2) M` of A, half life is found to be 120 minute. For the initial concentration `4.0 xx 10^(-2) M`, the half life of the reaction becomes 240 minute. The order of the reaction is `:`A. zeroB. oneC. twoD. `0.5` |
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Answer» Correct Answer - 3 `((t_(1//2))_(1))/((t_(1//2))_(2))=((a_(2))/a_(1))^(n-1),(120)/(240)=((4xx10^(-2))/(8xx10^(-2)))^(n-1),n=2` |
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| 842. |
The rate of reaction ` A+B+C to ` product is given by ` r= K[A]^(1//3)[B]^(1//2)[C].` The order of the reaction isA. 1B. 3C. `(5)/(6) `D. `(11)/(6)` |
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Answer» Correct Answer - D The order of reaction is `(1)/(3)+(1)/(2)+1=(11)/(6)` |
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| 843. |
For the reaction ` A to C ` it is found that the rate of the reaction quadruples when the concentration of A is doubled . The rate for the reaction is Rate =`[A]^(n) ` where the value of n isA. 1B. 2C. zeroD. 3 |
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Answer» Correct Answer - B Rate `=[A]^(n) therefore 4=[2]^n therefore n=2` |
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| 844. |
What is the order of a reaction which has a rate expression, i.e. rate = `k[A]^(3//2)[B]^(-1)`?A. `(3)/(2)`B. `(1)/(2)`C. ZeroD. 1 |
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Answer» Correct Answer - B `(3)/(2)-1=(1)/(2)` |
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| 845. |
The reaction between `H_(2(g) ) and ICI _((g)) ` occurs in the following steps: ` H_(2) +ICI to HI +HCI ` `HI +ICI to I_(2) +HCI ` The reaction interemediate in the reaction isA. `HCI`B. `HI`C. `I_(2)`D. `ICI` |
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Answer» Correct Answer - B Common substance for both the step . |
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| 846. |
The rate constant of a reactionA. Decreases with increasing `E_(a) `B. Decreases with decreasing `E_(a)`C. is independent of `E_(a)`D. decreases with increasing temperature |
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Answer» Correct Answer - A Aeehenius equation . |
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| 847. |
A catalyst increases the rate of the temperatureA. increasing `E_(a)`B. increasing TC. decreasing `E_(a)`D. decreasing T |
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Answer» Correct Answer - C Effect of catalyst. |
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| 848. |
The correct difference between first and second order reaction is thatA. The rate of a first order reaction does not depend on reactant concentration , the rate of a second order reaction does depend on reactant concentrationsB. The half life of a first order reaction does not depend on `[A]_(0)` : the half life of a second order reaction does depend on `[A]_(0)`C. A first order reaction can be catalyzed , a second order reaction cannot be catalyzedD. The rate of a first order reaction does depend on reactant concentrations , the rate of a second order reaction does not depend on reactant concentrations |
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Answer» Correct Answer - b `(t_(1//2)) 1^(st)` order = Independent of concentration `(t_(1//2)) 2^(nd)` order `prop (1)/([A]_(0))` |
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| 849. |
When initial concentration of the reactant is doubled , the half-life period of a zero order reactionA. Is halvedB. Is doubledC. Is tripledD. Remains unchanged |
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Answer» Correct Answer - b `(t_(1//2))_("zero") = ([A]_(0))/(2K)` `therefore` If `[A]_(0)` = doubled , `t_(1//2)` = doubled |
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| 850. |
Assertion: In a zero order reaction, if concentration of the reactant is doubled, half-life period is also doubled. Reason: The total time taken for a zero order reaction to complete is double of the half-life period.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - B Correct explanation. For zero order reaction, `t_(1//2) = a(t_(1//2) = a//2 k)` |
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