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.
| 24601. |
The rate of reactino of which of the following is not affected by pressure |
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Answer» `PCl_(3)+Cl_(2)hArrPCl_(5)` |
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| 24602. |
The rate of radioactive decomposition corresponding to 3.7 xx 10^(10) disintegration per second is called a curie. What weight of ""^(225)Ra, whose t_((1)/(2))=1620 yr, will be required to yield 1 millicurie of radiation? |
| Answer» SOLUTION :`1 xx 10^(-3)G` | |
| 24603. |
The rate of physisorption |
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Answer» DECREASES with increase of pressure |
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| 24604. |
The rates of most reactions double when their temperature is raised from 298 K to 308 K. Calculate their activation energy. |
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Answer» SOLUTION :`logK_2/K_1=E_a/(2.303R)[1/T_1-1/T_2]` `E_a=(2.303xx8.314xx298xx308xx0.3010)/1000` `E_a`=52.89 KJ/mol |
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| 24605. |
The rate of most reactions becomes double when their temperature is raised from 298 K to 308 K. Calculate their activation energy. |
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Answer» Solution :`T_(1) = 298 K, T_(2) = 308 K`. `R = 8.314 J mol^(-1) K^(-1)` Activation energy `K_(2) = 2K_(1)` `log.(K_(2))/(K_(1)) = (E_(a))/(2.303 R)[(T_(2)-T_(1))/(T_(1) XX T_(2))]` `log 2 = (E_(a))/(2.303 xx 8.314)[(308 - 298)/(308 xx 298)]` `0.3010 = (E_(a))/(19.147)[(10)/(91784)]` `0.3010 = (E_(a))/(19.147) xx 1.08 xx 10^(-4)` `E_(a) = (0.3010 xx 19.147)/(1.089 xx 10^(-4))` `= (5.763)/(1.089 xx 10^(-4))` `= 52922.37 J mol^(-1)` |
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| 24606. |
The rate of forward reaction is two times that of the reverse reaction at a given temperature and identical concentration. K_("equilibrium") is |
| Answer» Solution :`K_(eqm)=(k_(f))/(k_(B))=(2)/(1)=2` | |
| 24607. |
The rate of Hoffmann's bromamide degradation with following amide will follow the order: |
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Answer» `III gtIgtIVgtII` |
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| 24608. |
The rate of forward reaction is two times that of reverse reaction at a given temperaturee and identical concentration. K_("equilibriuim") is |
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Answer» `2.5` |
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| 24609. |
The ratio of the forward reaction is two times that of the revers reaction at a given temperature and identical concentration.K_("equilibrium") is |
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Answer» 2.5 `(d[A])/(DT)=2(d[B])/(dt)` `K_("EQUILIBRIUM")=(K_(1))/(K_(2))=(d[A]//dt)/(d[B]//dt)=2(d[B]//dt)/(d[B]//dt)=2`. `thereforeK_("equilibrium")=2`. |
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| 24610. |
The rate of formation of SO_(3) in the reaction 2SO_(2)+O_(2)to2SO_(3) is 100 g "min"^(-1) Hence rate of disappearance of O_(2) is |
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Answer» `50g"min"^(-1)` |
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| 24611. |
The rate of formation of NO(g) in the reaction 2NOBr(h) to 2NO(g)+Br_(2)(g) was reported as 1.6xx10^(-4)mol^(-1)sec^(-1). What is the rate of reaction and rate of consumption of NOBr? |
| Answer» SOLUTION :`8XX10^(-5)`, `1.6xx10^(-4)MSEC^(-1)` | |
| 24612. |
The rate of formation of ammonia by the reaction: N_2 +3H_2 to 2NH_3 expressed as (d[NH_3])/(dt)= 2.5xx 10^(-4)molL^(-1)s^(-1) The rate of consumption expressed in terms of H_2 as (-d[H_2])/(dt) will be |
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Answer» double |
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| 24613. |
The rate of formation of a dimer in a second order reaction 7.5xx10^(-3) "mol L"^(-1)s^(-1)at 0.05"mol L "^(--1)monomer concentration. Calculate the rate constant. |
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Answer» Solution :LET us consider the DIMERISATION of a MONOMER M . `2M rarr(M)_2` Rate `=k[M]^n` Given that n = 2 [ M] `=0.05 "mol L"^(-1)` Rate `=7.5xx10^(-3) "mol L"^(-1)s^(-1)` `k=("Rate")/([M]^n)impliesk=(7.5xx10^(-3))/((0.05)^2)=3 "mol"^(-1)Ls^(-1)` |
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| 24614. |
The rate of formation of a dimer in a second order reaction is 7.5xx10^(-3)"mol L"^(-1)s^(-1) at 0.05"mol L"^(-1) monomer concentration. Calculate the rate constant. |
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Answer» SOLUTION :Let US consider the dimerisation of a monomer M `2Mrarr(M)_(2)` `"Rate "=k[M]^(n)` `"Given that n = 2 and [M]"="0.05 MOL L"^(-1)` `"Rate "=7.5xx10^(-3)" mol L"^(-1)s^(-1)` `k=("Rate")/([M]^(n))RARR k=(7.5xx10^(-3))/((0.05)^(2))="3 mol"^(-1)L s"^(-1)` |
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| 24615. |
The rate of formation of a dimer in a second order dimerisation reaction is 9*5xx10^(-5)molL^(-1)s^(-1)" at "0*01molL^(-1) monomer concentration. Calculate the rate constant. |
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Answer» Solution :If the monomer is represented by A, then the reaction is : `2Ato(A)_(2)` As the reaction is of SECOND ORDER, the rate of reaction will be given by : Rate `=k[A]^(2)` Rate of reaction `=-(1)/(2)(d[A])/(dt)=+(d[A_(2)])/(dt)=9*5xx10^(-5)molL^(-1)s^(-1)` `:.9*5xx10^(-5)"MOL "L^(-1)s^(-1)=k(0*01"mol "L^(-1))^(2)=kxx10^(-4)("mol "L^(-1))^(2)" or "k=0*95L" mol"^(-1)s^(-1)` |
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| 24616. |
The rate of first order reaction increases: |
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Answer» If the temperature is increased |
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| 24617. |
The rate of fchemical reaction depends on the nature of chemical reactions, because |
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Answer» the threshold energy LEVEL differs from one reaction to another Also `K = Ae^(-E//RT)` and rate `= k ["reactant"]^n` |
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| 24618. |
The rate of first order reaction A rarr Products, is7.5xx10^-4 mole litre^-1sec^-1.If the concentration of A is 0.5 mole litre-1the rate constant is: |
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Answer» `3.75xx10^-4sec^-1` |
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| 24619. |
The rate of elementary reaction, A to B, increases by 400 times when the concentration of A is increased twenty folds. The order of the reaction with respect to A is |
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Answer» 1 ALSO, `400r = k [20A]^m` …(ii) From (ii)`-:`(i) `400 = (20)^m` `(20)^2 = (20)^m` ltbRgt `:.m = 2` |
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| 24620. |
The rate of elementary chemical reaction is directly proportional to: |
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Answer» ACTIVE masses of REACTANTS |
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| 24621. |
The rate of effusion of a particular gas whas measured to be 40ml/min. Under same condition the rate of effusion of pure methane was 20ml/min. Then find molar mass of gas. |
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Answer» 4amu `M_(gas)=4gm` |
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| 24622. |
The rate of disapperance of SO_(2) in the reaction 2SO_(2) + O_(2) to 2SO_(3) is 1.28 xx 10^(-3)g/secthen the rate of formation of SO_(3) is |
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Answer» `0.64xx 10^(-3)` G /sec |
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| 24623. |
The rate of disappearance of CO in the reaction, 2 CO +O_2 to 2CO_2 is 1.28 xx 10^(-3)g//sec. Then the rate of formation of CO_2 is |
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Answer» `0.64 xx 10^(-3) g// sec` Rate of FORMATION of CO = rate of disappearance of `CO_2` `=1.28xx10^(-3)g//sec` |
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| 24624. |
The rate of diffusion of two gases x and y is in the ratio of 1 : 5 and that of y and z in the ratio of 1 : 6 the ratio of the rate of diffusion of z with respect to x is : |
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Answer» Solution :`(r_(x))/(r_(y))=(1)/(5)""....(i)""(r_(g))/(r_(z))=(1)/(6)""....(ii)` `(i)xx(ii) : (r_(x))/(r_(z))=(1)/(30)IMPLIES (r_(z))/(r_(x))=(30)/(1)` |
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| 24625. |
The rate of diffusion of SO_2 and O_2 at the same P and T are in the ratio (S = 32, O = 16): |
| Answer» ANSWER :D | |
| 24626. |
The rate of diffusion of methane at a given temperature is twice that of a gas X. The molecular weight of X is |
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Answer» 64 |
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| 24627. |
The rate of diffusion of methane at a given temperature is twice that of a gas X. The molecular weight of X is : |
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Answer» 64 |
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| 24628. |
The rate of diffusion of a sample of ozonised oxygen is 0.98 times more than that of pure oxygen. Find the percentage (by volume) of ozone in the ozonised sample. |
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Answer» |
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| 24629. |
The rate of diffusion of gas is ……… proportional to both ....... of molecular mass. |
| Answer» SOLUTION :INTERCEPT =RT | |
| 24630. |
The rate of decomposition of N_(2)O_(5) in C Cl_(4) solution has been studied at 318 K and the following results have been obtained : {:(t//min,,,0,,,135,,,342,,,683,,,1693),(c//M,,,2.08,,,1.91,,,1.67,,,1.35,,,0.57):} Find the order of the reaction and calculate its rate constant. What is the half-life period ? |
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Answer» |
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| 24631. |
The rate of dehydration of alcohols to form alkenes depends on ........ |
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Answer» Both the CONCENTRATION of dehydrating AGENT and alcohol |
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| 24632. |
The rate of decompostion of ozone drops sharply in ………… . |
| Answer» Solution :alkaline medium | |
| 24633. |
The rate of decomposition of ammonia is found to depend upon the concentration of NH_(3) according to the equation -(d[NH_(3)])/(dt)=(k_(1)[NH_(3)])/(1+k_(2)[NH_(3)]) What will be the order of reaction when (i) concentration of NH_(3) is very high ? (ii) concentration of NH_(3) is very low ? |
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Answer» Solution :The given rate law equation can be written as `-(d[NH_(3)])/(DT)=(k_(1))/(1//[NH_(3)]+k_(2))` (i) If `[NH_(3)]` is very high, `1//[NH_(3)]` becomes negligible `:.-(d[NH_(3)])/(dt)=(k_(1))/(k_(2))=k` i.e., rate becomes independent of concentration. Hence,it is of zero ORDER. (ii) If `[NH_(3)]` is very SMALL, `1//[NH_(3)]` will be very large `(gtgtk_(2))`, so that `k_(2)` can be neglected in comparison to `1//[NH_(3)]`. Hence, `-(d[NH_(3)])/(dt)=(k_(1))/(1//[NH_(3)])=k_(1)[NH_(3)]` Thus, REACTION is of 1st order. |
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| 24634. |
The rate of decomposition of hydrogen peroxide decreases in presence of |
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Answer» Platinum |
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| 24635. |
The rate of decomposition of ammonia is found to depend upon the concentration of ammonia as : - (d[NH_(3)])/(dt) = (k_(1) [NH_(3)])/(1 + k_(2) [NH_(3)]) which of the following statement is correct ? |
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Answer» The reaction is zero ORDER at very lowas WELL as very high `NH_(3)` CONCENTRATION |
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| 24636. |
The rate of decomposition of a gas at a certain temperature is 5.14 and 7.25 in some units for 20% and 5% decomposition respectively. Calculate the order of the reaction. |
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Answer» |
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| 24637. |
The rate of decompositionof a substance increases by a factor 2.25 for 1.5 times increases in concentration of substance at same temperature. Find order of the reaction |
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Answer» |
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| 24638. |
The rate of decomposition for methyl nitrite and ethyl nitrite can be given in terms of rate constant k_(1) and k_(2) respectively. The energy of activation for the two reactions are 152.30 kJ mol^(-1) and 157.7 kg mol^(-1) as well as frequency factors are 10^(13) and 10^(14) respectively for the decomposition of methyl and ethyl nitrite. Calculate the temperature at which rate constant will be same for the two reactions. |
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Answer» 256 K |
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| 24639. |
The rate of decomposition for methyl nitrite and ethyl nitrite can be given in terms of rate constant ("in" sec^(-1)) k_(1) "and"k_(2) respectively. The energy of activationsfor the two reactions are 152.30 kJ "mol"^(-1) "and" 157.7 kJ "mol"^(-1) as well as frequency factors are 10^(13)"and" 10^(14) respectively for the decomposition of methyl and ethyl nitrite. Calculate the approx. temperature at which rate constant will be same for the two reactions. |
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Answer» |
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| 24640. |
The rate of decomposition for methyl nitrite and ethyl nitrite can be given in terms of rate constant ("in" sec^(-1)) K_(1) and K_(2) respectively. The energy of activation for the two reaction are 152.30 kJ mol^(-1) and 157.7 kJ mol^(-1) as well as frequency factor are 10^(13) and 10^(14) respectively for the decomposition of methyl and ethyl nitrite. Calculate the temperature at which rate constant will be same for the two reactions. |
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Answer» |
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| 24641. |
The rate of decay per second of a radioactive sample |
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Answer» proportional to the life time lived by the nucleus |
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| 24642. |
The rate of chemisorption |
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Answer» decreases with INCREASE of pressure |
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| 24643. |
The rate of constant is numerically the same for 1 order, II order and III order. Select the correct statements, if |
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Answer» `[A]LT1,` then `r_(1)gtr_(2)gtr_(3)` `AtoB^(+)""C` `C_(0)""0""0` |
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| 24644. |
The rate constant of a reaction depends on |
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Answer» TEMPERATURE |
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| 24645. |
The rate of chemisorption : |
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Answer» is INDEPENDENT of PRESSURE |
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| 24646. |
The rate of chemical reaction is doubled for every 10^@C rise in temperature because of |
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Answer» decrease in the ACTIVATION energy |
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| 24647. |
The rate of chemical reaction is directly proportional to |
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Answer» active masses of reactants |
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| 24648. |
The rate of chemical reaction (except zero order) |
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Answer» decreases from MOMENT to moment Where x STANDS for product concentration and [A] stands for REACTANT concentration. It continously decreases with decrease in concentrationof reactant with time |
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| 24649. |
The rate-of chemical reaction (except zero order): |
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Answer» Decreases from MOMENT to moment |
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| 24650. |
The rate of chemical reaction depends upon |
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Answer» TIME |
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