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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 1251. |
The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is [CBSE PMT 2005] |
| A. | - 1 |
| B. | -2 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 1252. |
For the following reaction scheme (homogeneous), the rate constant has units : \[A+B\xrightarrow{K}C\] [MP PET 1999] |
| A. | \[{{\sec }^{-1}}\,mole\] |
| B. | \[{{\sec }^{-1}}\] |
| C. | \[{{\sec }^{-1}}litre\ mol{{e}^{-1}}\] |
| D. | sec |
| Answer» D. sec | |
| 1253. |
For a first order reaction \[A\to B\] the reaction rate at reactant concentration of \[0.01M\] is found to be \[2.0\times {{10}^{-5}}mol\ {{L}^{-1}}{{s}^{1}}\]. The half life period of the reaction is [CBSE PMT 2005] |
| A. | 220 s |
| B. | 30 s |
| C. | 300 s |
| D. | 347 s |
| Answer» E. | |
| 1254. |
\[{{t}_{\frac{1}{4}}}\] can be taken as the time taken for the concentration of a reactant to drop to \[\frac{3}{4}\] of its initial value. If the rate constant for a first order reaction is \[K\], the \[{{t}_{\frac{1}{4}}}\] can be written as [AIEEE 2005] |
| A. | \[0.10/K\] |
| B. | \[0.29/K\] |
| C. | \[0.69/K\] |
| D. | \[0.75/K\] |
| Answer» C. \[0.69/K\] | |
| 1255. |
Which one of the following statement for order of reaction is not correct [IIT 2005] |
| A. | Order can be determined experimentally. |
| B. | Order of reaction is equal to sum of the powers of concentration terms in differential rate law. |
| C. | It is not affected with the stoichiometric coefficient of the reactants. |
| D. | Order cannot be fractional. |
| Answer» E. | |
| 1256. |
For reaction a \[A\to x\ P\], when \[[A]=2.2\ mM\], the rate was found to be \[2.4\ mM\ {{s}^{-1}}\]. On reducing concentration of A to half, the rate changes to \[0.6\ mM\ {{s}^{-1}}\]. The order of reaction with respect to A is [AIIMS 2005] |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» C. 2.5 | |
| 1257. |
For a first order reaction [IIT 1998] |
| A. | The degree of dissociation is equal to \[(1-{{e}^{-kt}})\] |
| B. | A plot of reciprocal concentration of the reactant vs time gives a straight line |
| C. | The time taken for the completion of 75% reaction is thrice the \[{{t}_{1/2}}\] of the reaction |
| D. | The pre-exponential factor in the Arrhenius equation has the dimension of time \[{{T}^{-1}}\] |
| Answer» B. A plot of reciprocal concentration of the reactant vs time gives a straight line | |
| 1258. |
The following statements(s) is(are) correct [IIT 1999] |
| A. | A plot of \[\log \,{{K}_{p}}\] versus \[1/T\] is linear |
| B. | A plot of \[\log \,[X]\] versus time is linear for a first order reaction \[X\to P\] |
| 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» B. A plot of \[\log \,[X]\] versus time is linear for a first order reaction \[X\to P\] | |
| 1259. |
The half-life of 2 sample are 0.1 and 0.4 seconds. Their respective concentration are 200 and 50 respectively. What is the order of the reaction [JEE Orissa 2004] |
| A. | 0 |
| B. | 2 |
| C. | 1 |
| D. | 4 |
| Answer» C. 1 | |
| 1260. |
Decay of \[_{92}{{U}^{235}}\]is .....order reaction [JEE Orissa 2004] |
| A. | Zero |
| B. | First |
| C. | Second |
| D. | Third |
| Answer» C. Second | |
| 1261. |
Which is correct about zero order reaction [JEE Orissa 2004] |
| A. | Rate of reaction depends on decay constant |
| B. | Rate of reaction is independent of concentration |
| C. | Unit of rate constant is concentration?1 |
| D. | Unit of rate constant is concentration?1 time?1 |
| Answer» C. Unit of rate constant is concentration?1 | |
| 1262. |
A first order reaction was started with a decimolar solution of the reactant, 8 minutes and 20 seconds later its concentration was found to be \[M/100\]. So the rate of the reaction is [Kerala PMT 2004] |
| A. | \[2.303\times {{10}^{-5}}\ {{\sec }^{-1}}\] |
| B. | \[2.303\times {{10}^{-4}}\ {{\sec }^{-1}}\] |
| C. | \[4.606\times {{10}^{-3}}\ {{\sec }^{-1}}\] |
| D. | \[2.606\times {{10}^{-5}}\ {{\sec }^{-1}}\] |
| E. | \[2.603\times {{10}^{-4}}\ {{\sec }^{-1}}\] |
| Answer» D. \[2.606\times {{10}^{-5}}\ {{\sec }^{-1}}\] | |
| 1263. |
The rate of a first order reaction is \[1.5\times {{10}^{-2}}\ mol{{L}^{-1}}\ {{\min }^{-1}}\]at 0.5 M concentration of the reactant. The half life of the reaction is [CBSE PMT 2004] |
| A. | 8.73 min |
| B. | 7.53 min |
| C. | 0.383 min |
| D. | 23.1 min |
| Answer» E. | |
| 1264. |
Order of radioactive disintegration reaction is [JEE Orissa 2004] |
| A. | Zero |
| B. | First |
| C. | Second |
| D. | Third |
| Answer» C. Second | |
| 1265. |
A first order reaction with respect to the reactant A has a rate constant of \[6\ {{\sec }^{-1}}\]. If we start with [A] = 0.5 mol/litre, then in what time the concentration of A becomes 0.05 mol/litre [DCE 2004] |
| A. | 0.384 sec |
| B. | 0.214 sec |
| C. | 3.84 sec |
| D. | 0.402 sec |
| Answer» B. 0.214 sec | |
| 1266. |
For a reaction, \[X(g)\to Y(g)+Z(g)\]the half life period is 10 min. In What period of time would the concentration of X be reduced to 10% of original concentration [DCE 2004] |
| A. | 20 min |
| B. | 33 min |
| C. | 15 min |
| D. | 25 min |
| Answer» C. 15 min | |
| 1267. |
In the first order reaction, the concentration of the reactant is reduced to 25% in one hour. The half life period of the reaction is [DCE 2004] |
| A. | 2 hr |
| B. | 4 hr |
| C. | 1/2 hr |
| D. | 1/4 hr |
| Answer» D. 1/4 hr | |
| 1268. |
In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is [AIEEE 2004] |
| A. | 7.5 minutes |
| B. | 15 minutes |
| C. | 30 minutes |
| D. | 60 minutes |
| Answer» D. 60 minutes | |
| 1269. |
Hydrolysis of DDT is a first order reaction, its half life is 10 years. Time to hydrolyse 10 g DDT to half is [BVP 2004] |
| A. | 100 years |
| B. | 50 years |
| C. | 5 years |
| D. | 10 years |
| Answer» E. | |
| 1270. |
Which of the following is an example of pseudo unimolecular reaction [Pb. CET 2001] |
| A. | \[C{{H}_{3}}COOC{{H}_{3}}+{{H}_{2}}O\xrightarrow{{{H}^{+}}}C{{H}_{3}}COOH+C{{H}_{3}}OH\] |
| B. | \[C{{H}_{3}}COOC{{H}_{3}}+{{H}_{2}}O\xrightarrow{O{{H}^{-}}}C{{H}_{3}}COOH+C{{H}_{3}}OH\] |
| C. | \[2FeC{{l}_{3}}+SnC{{l}_{2}}\to SnC{{l}_{4}}+2FeC{{l}_{2}}\] |
| D. | \[NaOH+HCl\to NaCl+{{H}_{2}}O\] |
| Answer» B. \[C{{H}_{3}}COOC{{H}_{3}}+{{H}_{2}}O\xrightarrow{O{{H}^{-}}}C{{H}_{3}}COOH+C{{H}_{3}}OH\] | |
| 1271. |
Which one of the following is wrongly matched [KCET 2004] |
| A. | Saponification of\[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\]? Second order reaction |
| B. | Hydrolysis of \[C{{H}_{3}}COOC{{H}_{3}}\]? Pseudo uni-molecular reaction |
| C. | Decomposition of \[{{H}_{2}}{{O}_{2}}\] ? First order reaction |
| D. | Combination of \[{{H}_{2}}\]and \[B{{r}_{2}}\] to give \[HBr\] ? Zero order reaction |
| Answer» E. | |
| 1272. |
The unit of velocity constant in case of zero order reaction is [MP PMT 2004] |
| A. | Concentration\[\times \text{Tim}{{\text{e}}^{-1}}\] |
| B. | \[\text{Concentratio}{{\text{n}}^{\text{-1}}}\times \text{Tim}{{\text{e}}^{\text{-1}}}\] |
| C. | \[\text{Concentration}\times \text{Tim}{{\text{e}}^{\text{2}}}\] |
| D. | \[\text{Concentratio}{{\text{n}}^{\text{-1}}}\times \text{Time}\] |
| Answer» B. \[\text{Concentratio}{{\text{n}}^{\text{-1}}}\times \text{Tim}{{\text{e}}^{\text{-1}}}\] | |
| 1273. |
The reaction \[A\to B\]follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B [CBSE PMT 2003] |
| A. | 2 hours |
| B. | 1 hour |
| C. | 0.5 hour |
| D. | 0.25 hour |
| Answer» C. 0.5 hour | |
| 1274. |
For a reaction \[A\to B\], the rate of reaction quadrupled when the concentration of A is doubled. The rate expression of the reaction is \[r=K{{(A)}^{n}}\]. when the value of \[n\] is |
| A. | 1 |
| B. | 0 |
| C. | 3 |
| D. | 2 |
| Answer» E. | |
| 1275. |
If the rate of the reaction is equal to the rate constant, the order of the reaction is [CBSE PMT 2003] |
| A. | 3 |
| B. | 0 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 1276. |
For the reaction system \[2NO(g)+{{O}_{2}}(g)\to 2N{{O}_{2}}(g)\] volume is suddenly produced to half its value by increasing the pressure on it. If the reaction is of first order with respect to \[{{O}_{2}}\] and second order with respect to \[NO\], the rate of reaction will [AIEEE 2003] |
| A. | Diminish to one fourth of its initial value |
| B. | Diminish to one eighth of its initial value |
| C. | Increase to eight times of its initial value |
| D. | Increase to four times of its initial value |
| Answer» D. Increase to four times of its initial value | |
| 1277. |
Which equation is correct for first order reactions [MP PMT 2003] |
| A. | \[{{t}_{1/2}}\propto {{C}^{-1}}\] |
| B. | \[{{t}_{1/2}}\propto C\] |
| C. | \[{{t}_{1/2}}\propto {{C}^{0}}\] |
| D. | \[{{t}_{1/2}}\propto {{C}^{1/2}}\] |
| Answer» D. \[{{t}_{1/2}}\propto {{C}^{1/2}}\] | |
| 1278. |
The decomposition of \[{{N}_{2}}{{O}_{5}}\] occurs as, \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}+{{O}_{2}}\], and follows Ist order kinetics, hence [BVP 2003] |
| A. | The reaction is unimolecular |
| B. | The reaction is bimolecular |
| C. | \[{{T}_{1/2}}\propto {{a}^{0}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 1279. |
75% of a first order reaction was completed in 32 minutes when was 50% of the reaction completed [AMU 1999; Kerala (Med.) 2003] |
| A. | 16 min. |
| B. | 24 min. |
| C. | 8 min. |
| D. | 4 min. |
| Answer» B. 24 min. | |
| 1280. |
For a chemical reaction....can never be a fraction [EAMCET 2003] |
| A. | Order |
| B. | Half-life |
| C. | Molecularity |
| D. | Rate constant |
| Answer» D. Rate constant | |
| 1281. |
In a reaction, the concentration of reactant is increased two times and three times then the increases in rate of reaction were four times and nine times respectively, order of reaction is [UPSEAT 2003] |
| A. | Zero |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 1282. |
For a first order reaction velocity constant, \[K={{10}^{-3}}{{s}^{-1}}\]. Two third life for it would be [MP PET 2001; UPSEAT 2003] |
| A. | 1100 s |
| B. | 2200 s |
| C. | 3300 s |
| D. | 4400 s |
| Answer» D. 4400 s | |
| 1283. |
If the order of the reaction \[x+y\xrightarrow{hv}x\,y\] is zero, it means that the rate of [Kurukshetra CEE 2002] |
| A. | Reaction is independent of temperature |
| B. | Formation of activated complex is zero |
| C. | Reaction is independent of the concentration of reacting species |
| D. | Decomposition of activated complex is zero |
| Answer» D. Decomposition of activated complex is zero | |
| 1284. |
In a first order reaction the concentration of reactant decreases from \[800\,mol/d{{m}^{3}}\] to \[50\,mol/d{{m}^{3}}\] is \[2\times {{10}^{2}}\sec \]. The rate constant of reaction in \[{{\sec }^{-1}}\] is [IIT-JEE (Screening) 2003] |
| A. | \[2\times {{10}^{4}}\] |
| B. | \[3.45\times {{10}^{-5}}\] |
| C. | \[1.386\times {{10}^{-2}}\] |
| D. | \[2\times {{10}^{-4}}\] |
| Answer» D. \[2\times {{10}^{-4}}\] | |
| 1285. |
For an elementary reaction, 2A + B\[\to \]C + D the molecularity is [Kurukshetra CEE 2002] |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Three |
| Answer» E. | |
| 1286. |
The half-life period for a first order reaction is 693 seconds. The rate constants for this reaction would be [MP PET 2002] |
| A. | \[0.1se{{c}^{-1}}\] |
| B. | \[0.01se{{c}^{-1}}\] |
| C. | \[0.001se{{c}^{-1}}\] |
| D. | \[0.0001se{{c}^{-1}}\] |
| Answer» D. \[0.0001se{{c}^{-1}}\] | |
| 1287. |
The reaction \[2{{N}_{2}}{{O}_{5}}\] ⇌ \[2{{N}_{2}}{{O}_{4}}+{{O}_{2}}\] is [MP PMT 2002] |
| A. | Bimolecular and second order |
| B. | Unimolecular and first order |
| C. | Bimolecular and first order |
| D. | Bimolecular and zero order |
| Answer» D. Bimolecular and zero order | |
| 1288. |
Units of rate constant of first and zero order reactions in terms of molarity M unit are respectively [AIEEE 2002] |
| A. | \[se{{c}^{-1}},\,\,\,M\,se{{c}^{-1}}\] |
| B. | \[se{{c}^{-1}},\,\,\,M\] |
| C. | \[M\,se{{c}^{-1}},\,\,\,se{{c}^{-1}}\] |
| D. | \[M,\,se{{c}^{-1}}\] |
| Answer» B. \[se{{c}^{-1}},\,\,\,M\] | |
| 1289. |
For the reaction \[A+2B\to C,\] rate is given by R \[=[A]{{[B]}^{2}}\] then the order of the reaction is [AIEEE 2002] |
| A. | 3 |
| B. | 6 |
| C. | 5 |
| D. | 7 |
| Answer» B. 6 | |
| 1290. |
Order of a reaction is decided by [KCET 2002] |
| A. | Pressure |
| B. | Temperature |
| C. | Molecularity |
| D. | Relative concentration of reactants |
| Answer» E. | |
| 1291. |
The given reaction \[2NO+{{O}_{2}}\to 2N{{O}_{2}}\] is an example of [CBSE PMT 2001; JIPMER 2002] |
| A. | First order reaction |
| B. | Second order reaction |
| C. | Third order reaction |
| D. | None of these |
| Answer» D. None of these | |
| 1292. |
A substance ?A? decomposes by a first order reaction starting initially with [A] =2.00m and after 200 min [A] = 0.15m. For this reaction what is the value of k [AIIMS 2001] |
| A. | \[1.29\times {{10}^{-2}}{{\min }^{-1}}\] |
| B. | \[2.29\times {{10}^{-2}}{{\min }^{-1}}\] |
| C. | \[3.29\times {{10}^{-2}}{{\min }^{-1}}\] |
| D. | \[4.40\times {{10}^{-2}}{{\min }^{-1}}\] |
| Answer» B. \[2.29\times {{10}^{-2}}{{\min }^{-1}}\] | |
| 1293. |
Which of the following statements about zero order reaction is not true [DCE 2001] |
| A. | Its unit is \[se{{c}^{-1}}\] |
| B. | The graph between log (reactant) versus rate of reaction is a straight line |
| C. | The rate of reaction increases with the decrease in concentration of reactants |
| D. | Rate of reaction is independent of concentration of reactants |
| Answer» B. The graph between log (reactant) versus rate of reaction is a straight line | |
| 1294. |
The rate constant of a reaction depends on [CPMT 1989; DPMT 2001] |
| A. | Temperature |
| B. | Mass |
| C. | Weight |
| D. | Time |
| Answer» B. Mass | |
| 1295. |
A First order reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed [AIIMS 2001] |
| A. | 5 hours |
| B. | 7.5 hours |
| C. | 10 hours |
| D. | 20 hours |
| Answer» C. 10 hours | |
| 1296. |
75% of a first order reaction is completed in 30 minutes. What is the time required for 93.75% of the reaction (in minutes) [KCET 2001] |
| A. | 45 |
| B. | 120 |
| C. | 90 |
| D. | 60 |
| Answer» E. | |
| 1297. |
The rate for a first order reaction is \[0.6932\times {{10}^{-2}}mol\,{{l}^{-1}}mi{{n}^{-1}}\] and the initial concentration of the reactants is 1M, \[{{T}_{1/2}}\] is equal to [JIPMER (Med.) 2001] |
| A. | \[6.932\] min |
| B. | 100 min |
| C. | \[0.6932\times {{10}^{-3}}\] min |
| D. | \[0.6932\times {{10}^{-2}}\] min |
| Answer» C. \[0.6932\times {{10}^{-3}}\] min | |
| 1298. |
For a given reaction \[{{t}_{1/2}}=\frac{1}{Ka}.\]. The order of the reaction is [KCET 2001] |
| A. | 1 |
| B. | 0 |
| C. | 3 |
| D. | 2 |
| Answer» E. | |
| 1299. |
The rate constant for a second order reaction is \[8\times {{10}^{-5}}{{M}^{-1}}mi{{n}^{-1}}\]. How long will it take a 1M solution to be reduced to 0.5 M [MH CET 2001] |
| A. | \[8\times {{10}^{-5}}\]min |
| B. | \[8.665\times {{10}^{3}}\]min |
| C. | \[4\times {{10}^{-5}}\]min |
| D. | \[1.25\times {{10}^{4}}\]min |
| Answer» E. | |
| 1300. |
For a reaction \[2NO(g)+C{{l}_{2}}(g)\]⇌\[\,2NOCl(g)\]. When concentration of \[C{{l}_{2}}\] is doubled, the rate of reaction becomes two times of the original. When the concentration of NO is doubled the rate becomes four times. What is the order of the reaction [MP PMT 2000] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |