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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.
| 1301. |
Which of the following expression is correct for first order reaction? \[(CO)\] refers to initial concentration of reactant [DCE 2000] |
| A. | \[{{t}_{1/2}}\propto CO\] |
| B. | \[{{t}_{1/2}}\propto C{{O}^{-1}}\] |
| C. | \[{{t}_{1/2}}\propto C{{O}^{-2}}\] |
| D. | \[{{t}_{1/2}}\propto C{{O}^{0}}\] |
| Answer» E. | |
| 1302. |
After how many seconds will the concentration of the reactants in a first order reaction be halved, if the decay constant is \[\text{1}\text{.155}\times \text{1}{{\text{0}}^{\text{-3}}}{{\sec }^{-1}}\] [CBSE PMT 2000] |
| A. | 100 sec |
| B. | 200 sec |
| C. | 400 sec |
| D. | 600 sec |
| Answer» E. | |
| 1303. |
What is the order of a reaction which has a rate expression rate \[=K{{[A]}^{3/2}}{{[B]}^{-1}}\] [DCE 2000] |
| A. | 3/2 |
| B. | ½ |
| C. | 0 |
| D. | None of these |
| Answer» C. 0 | |
| 1304. |
Point out the wrong statement : For a first order reaction |
| A. | Time for half-change \[({{t}_{1/2}})\] is independent of initial concentration |
| B. | Change in the concentration unit does not change the rate constant \[(K)\] |
| C. | Time for half-change \[\times \] rate constant \[=0.693\] |
| D. | The unit of \[K\] is \[mol{{e}^{-1}}{{\min }^{-1}}\] |
| Answer» E. | |
| 1305. |
Which among the following is a false statement [KCET 1999] |
| A. | Half life of a third order reaction is inversely proportional to the square of initial concentration of the reactant. |
| B. | Molecularity of a reaction may be zero or fractional |
| C. | For a first order reaction \[{{t}_{1/2}}=\frac{0.693}{K}\] |
| D. | Rate of zero order reaction is independent of initial concentration of reactant |
| Answer» C. For a first order reaction \[{{t}_{1/2}}=\frac{0.693}{K}\] | |
| 1306. |
For the reaction \[A+B\to \]products, doubling the concentration of A the rate of the reaction is doubled, but on doubling the concentration of B rate remains unaltered. The over all order of the reaction is [JIPMER 1999] |
| A. | 1 |
| B. | 0 |
| C. | 2 |
| D. | 3 |
| Answer» B. 0 | |
| 1307. |
For a first order reaction \[A\to \]product, the rate of reaction at \[[A]=0.2\,\,mol\,\,{{l}^{-1}}\] is \[1.0\times {{10}^{-2}}mol\,\,{{l}^{-1}}\,{{\min }^{-1}}\]. The half life period for the reaction is [Roorkee 1999] |
| A. | 832 s |
| B. | 440 s |
| C. | 416 s |
| D. | 13.86 s |
| Answer» E. | |
| 1308. |
The rate law of the reaction \[A+2B\to \]Product is given by \[\frac{d[dB]}{dt}=k[{{B}^{2}}]\]. If A is taken in excess, the order of the reaction will be [AMU (Engg.) 1999] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 1309. |
Certain bimolecular reactions which follow the first order kinetics are called [KCET (Med.) 1999] |
| A. | First order reactions |
| B. | Unimolecular reactions |
| C. | Bimolecular reactions |
| D. | Pseudounimolecular reactions |
| Answer» E. | |
| 1310. |
The rate constant of a first order reaction is \[3\times {{10}^{-6}}\]per second. If the initial concentration is 0.10 m, the initial rate of reaction is [AFMC 1999 Pb. PMT 1999, 2000; BHU 1999; AIIMS 1999; KCET 2000; DCE 2004] |
| A. | \[3\times {{10}^{-5}}m{{s}^{-1}}\] |
| B. | \[3\times {{10}^{-6}}m{{s}^{-1}}\] |
| C. | \[3\times {{10}^{-8}}m{{s}^{-1}}\] |
| D. | \[3\times {{10}^{-7}}m{{s}^{-1}}\] |
| Answer» E. | |
| 1311. |
The rate constant of a reaction is \[0.69\times {{10}^{-1}}{{\min }^{-1}}\] and the initial concentration is \[0.2mol\,{{l}^{-1}}.\] The half-life period is [AIIMS 1998] |
| A. | 400 sec |
| B. | 600 sec |
| C. | 800 sec |
| D. | 1200 sec |
| Answer» C. 800 sec | |
| 1312. |
For the reaction \[{{H}_{2}}+C{{l}_{2}}\xrightarrow{\text{Sunlight}}2HCl\] taking place on water, the order of reaction is [KCET 1998; AIIMS 2002; Pb. PMT 2002] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» E. | |
| 1313. |
For a first order reaction, rate constant is \[0.6932\,h{{r}^{-1}}\], then half-life for the reaction is [Bihar MEE 1997] |
| A. | \[0.01\,hr\] |
| B. | \[1\,hr\] |
| C. | \[2\,hr\] |
| D. | \[10\,hr\] |
| E. | \[0.1\,hr\] |
| Answer» C. \[2\,hr\] | |
| 1314. |
For a reaction whose rate expression is : Rate \[=k{{[A]}^{1/2}}{{[B]}^{3/2}}\], the order would be [Pune CET 1998] |
| A. | 1.5 |
| B. | 2 |
| C. | 3 |
| D. | 1 |
| Answer» C. 3 | |
| 1315. |
For the reaction\[A\to B\], the rate increases by a factor of 2.25 when the concentration of \[A\] is increased by 1.5. What is the order of the reaction [KCET 1998] |
| A. | 3 |
| B. | 0 |
| C. | 2 |
| D. | 1 |
| Answer» D. 1 | |
| 1316. |
Velocity constant K of a reaction is affected by |
| A. | Change in the concentration of the reactant |
| B. | Change of temperature |
| C. | Change in the concentration of the product |
| D. | None of the above |
| Answer» C. Change in the concentration of the product | |
| 1317. |
For the reaction \[A\to B\], the rate law expression is : Rate \[=\,k\,[A]\] Which of the following statements is incorrect [Pb. PMT 1998] |
| A. | The reaction is said to follow first order kinetics |
| B. | The half life of the reaction will depend on the initial concentration of the reactant |
| C. | \[k\]is constant for the reaction at a constant temperature |
| D. | The rate law provides a simple way of predicting the concentration of reactants and products at any time after the start of the reaction |
| Answer» C. \[k\]is constant for the reaction at a constant temperature | |
| 1318. |
If initial concentration is reduced to its 1/4th in a zero order reaction, the time taken for half of the reaction to complete [BHU 1998] |
| A. | Remains same |
| B. | Becomes 4 times |
| C. | Becomes one-fourth |
| D. | Doubles |
| Answer» D. Doubles | |
| 1319. |
Order of a reaction can have [DPMT 1996] |
| A. | \[+ve\] values |
| B. | Whole number values |
| C. | Fractional values |
| D. | All of the above |
| Answer» E. | |
| 1320. |
The order of the reaction occurring by following mechanism should be [JIPMER 1997] (i) \[{{A}_{2}}\to A+A\] (fast) (ii) \[A+{{B}_{2}}\to AB+B\] (slow) (iii) \[A+B\to \] (fast) |
| A. | \[1\,\frac{1}{2}\] |
| B. | \[3\frac{1}{2}\] |
| C. | 2 |
| D. | None of these |
| Answer» B. \[3\frac{1}{2}\] | |
| 1321. |
If reaction between \[A\] and \[B\] to give \[C\]shows first order kinetics in \[A\] and second order in \[B\], the rate equation can be written as [MP PET 1999] |
| A. | Rate \[=k\,[A]\,{{[B]}^{1/2}}\] |
| B. | Rate \[=k{{[A]}^{1/2}}[B]\] |
| C. | Rate \[=k\,[A]\,{{[B]}^{2}}\] |
| D. | Rate \[=k{{[A]}^{2}}[B]\] |
| Answer» D. Rate \[=k{{[A]}^{2}}[B]\] | |
| 1322. |
The reaction \[2FeC{{l}_{3}}+SnC{{l}_{2}}\to 2FeC{{l}_{2}}+SnC{{l}_{4}}\] is an example of [CBSE PMT 1996; MP PET 1999] |
| A. | First order reaction |
| B. | Second order reaction |
| C. | Third order reaction |
| D. | None of these |
| Answer» D. None of these | |
| 1323. |
The conversion of \[A\to B\] follows second order kinetics. Doubling the concentration of \[A\] will increase the rate of formation of \[B\] by a factor [MP PET 1999; DCE 1999; KCET 2001; BCECE 2005] |
| A. | \[1/4\] |
| B. | 2 |
| C. | \[1/2\] |
| D. | 4 |
| Answer» E. | |
| 1324. |
The rate constant of a first order reaction whose half-life is 480 seconds, is [MP PET 1999] |
| A. | \[2.88\times {{10}^{-3}}{{\sec }^{-1}}\] |
| B. | \[1.44\times {{10}^{-3}}{{\sec }^{-1}}\] |
| C. | \[1.44\,{{\sec }^{-1}}\] |
| D. | \[0.72\times {{10}^{-3}}{{\sec }^{-1}}\] |
| Answer» C. \[1.44\,{{\sec }^{-1}}\] | |
| 1325. |
For a reactions \[A+B\to \]product, it was found that rate of reaction increases four times if concentration of ?A? is doubled, but the rate of reaction remains unaffected. If concentration of ?B? is doubled. Hence, the rate law for the reaction is [MP PET/PMT 1998; MP PMT 2003] |
| A. | \[\text{rate}=k[A][B]\] |
| B. | \[\text{rate}=k{{[A]}^{2}}\] |
| C. | \[\text{rate}=k{{[A]}^{2}}{{[B]}^{1}}\] |
| D. | \[\text{rate}=k{{[A]}^{2}}{{[B]}^{2}}\] |
| Answer» C. \[\text{rate}=k{{[A]}^{2}}{{[B]}^{1}}\] | |
| 1326. |
Which of these does not influence the rate of reaction [KCET 2005] |
| A. | Nature of the reactants |
| B. | Concentration of the reactants |
| C. | Temperature of the reaction |
| D. | Molecularity of the reaction |
| Answer» E. | |
| 1327. |
Alpha rays consist of a stream of [BHU 1979] |
| A. | \[{{H}^{+}}\] |
| B. | \[H{{e}^{+2}}\] |
| C. | Only electrons |
| D. | Only neutrons |
| Answer» C. Only electrons | |
| 1328. |
a-particles can be detected using [AIIMS 2005] |
| A. | Thin aluminum sheet |
| B. | Barium sulphate |
| C. | Zinc sulphide screen |
| D. | Gold foil |
| Answer» D. Gold foil | |
| 1329. |
Alpha particles are ...... times heavier (approximately) than neutrons [CPMT 1971] |
| A. | 2 |
| B. | 4 |
| C. | 3 |
| D. | \[2\frac{1}{2}\] |
| Answer» C. 3 | |
| 1330. |
The radiations having high penetrating power and not affected by electrical and magnetic field are [Kerala CET 1992] |
| A. | Alpha rays |
| B. | Beta rays |
| C. | Gamma rays |
| D. | Neutrons |
| Answer» D. Neutrons | |
| 1331. |
The velocity of \[\alpha \]-rays is approximately [CPMT 1982] |
| A. | Equal to that of the velocity of light |
| B. | 1/10 of the velocity of light |
| C. | 10 times more than the velocity of light |
| D. | Uncomparable to the velocity of light |
| Answer» C. 10 times more than the velocity of light | |
| 1332. |
Calculate mass defect in the following reaction \[_{1}{{H}^{2}}{{+}_{1}}{{H}^{3}}{{\to }_{1}}H{{e}^{4}}{{+}_{0}}{{n}^{1}}\] (Given : mass \[{{H}^{2}}=2.014,\,{{H}^{3}}=3.016,\,He=4.004,\] \[n=1.008\,amu\]) [Kerala CET 2005] |
| A. | 0.018 amu |
| B. | 0.18 amu |
| C. | 0.0018 amu |
| D. | 1.8 amu |
| E. | 18 amu |
| Answer» B. 0.18 amu | |
| 1333. |
Decrease in atomic number is observed during [IIT 1998] |
| A. | Alpha emission |
| B. | Beta emission |
| C. | Positron emission |
| D. | Electron capture |
| Answer» B. Beta emission | |
| 1334. |
Nuclear theory of the atom was put forward by [KCET 2004] |
| A. | Rutherford |
| B. | Aston |
| C. | Neils Bohr |
| D. | J.J. Thomson |
| Answer» B. Aston | |
| 1335. |
The charge on gamma rays is [Pb. PMT 2004; EAMCET 2004] |
| A. | Zero |
| B. | +1 |
| C. | ?1 |
| D. | +2 |
| Answer» B. +1 | |
| 1336. |
A nuclear reaction is accompanied by loss of mass equivalent to \[0.01864\ amu\]. Energy liberated is [DCE 2002] |
| A. | \[931\ MeV\] |
| B. | \[186.6\ MeV\] |
| C. | \[17.36\ MeV\] |
| D. | \[460\ MeV\] |
| Answer» D. \[460\ MeV\] | |
| 1337. |
The amount of energy, which is required to separate the nucleons from a nucleus. The energy is called [UPSEAT 2001] |
| A. | Binding energy |
| B. | Lattice energy |
| C. | Kinetic energy |
| D. | None of these |
| Answer» B. Lattice energy | |
| 1338. |
Which of the following can be used to convert \[_{7}^{14}N\] into \[_{8}^{17}O\] [MP PMT 2001] |
| A. | Deuteron |
| B. | Proton |
| C. | a-particle |
| D. | Neutron |
| Answer» D. Neutron | |
| 1339. |
Which of the following is not deflected by magnetic field [MP PMT 2001] |
| A. | Deuteron |
| B. | Positron |
| C. | Proton |
| D. | Photon |
| Answer» E. | |
| 1340. |
The element californium belongs to the family of [UPSEAT 2002] |
| A. | Actinide series |
| B. | Alkali metal family |
| C. | Alkaline earth family |
| D. | Lantanide series |
| Answer» B. Alkali metal family | |
| 1341. |
Which statement is incorrect [CPMT 1982] |
| A. | \[\alpha \]-rays have more penetrating power than \[\beta \]-rays |
| B. | \[\alpha \]-rays have less penetrating power than \[\gamma \]-rays |
| C. | \[\beta \]-rays have less penetrating power than \[\gamma \]-rays |
| D. | \[\beta \]-rays have more penetrating power than \[\alpha \]-rays |
| Answer» B. \[\alpha \]-rays have less penetrating power than \[\gamma \]-rays | |
| 1342. |
During b-decay [UPSEAT 2001] |
| A. | An atomic electron is ejected |
| B. | An electron which is already present with in the nucleus is ejected |
| C. | A neutron in the nucleus decays emitting an electron |
| D. | A part of binding of the nucleus is converted into an electron |
| Answer» D. A part of binding of the nucleus is converted into an electron | |
| 1343. |
The \[_{88}R{{a}^{226}}\] is [AIIMS 2001] |
| A. | n-mesons |
| B. | u-mesons |
| C. | Radioactive |
| D. | Non-radioactive |
| Answer» D. Non-radioactive | |
| 1344. |
The radiations from a naturally occurring radio element, as seen after deflection in a magnetic field in one direction, are [IIT 1984; MP PMT 1986; MP PET/PMT 1988 JIPMER 1999] |
| A. | Definitely a-rays |
| B. | Definitely b-rays |
| C. | Both a and b-rays |
| D. | Either a or b-rays |
| Answer» E. | |
| 1345. |
There exists on \[\gamma \]-rays [MP PMT 1996; Pb. PMT 2004; EAMCET 2004] |
| A. | Positive charge |
| B. | Negative charge |
| C. | No charge |
| D. | Sometimes positive charge, sometimes negative charge |
| Answer» D. Sometimes positive charge, sometimes negative charge | |
| 1346. |
Which has the least penetrating power [CPMT 1994] |
| A. | \[\beta \]-rays |
| B. | \[\alpha \]-rays |
| C. | \[\gamma \]-rays |
| D. | \[X\]-rays |
| Answer» C. \[\gamma \]-rays | |
| 1347. |
Which leaves no track on Wilson cloud chamber [AFMC 1988] |
| A. | Electrons |
| B. | Protons |
| C. | \[\alpha \]-particles |
| D. | Neutrons |
| Answer» E. | |
| 1348. |
Uranium ultimately decays into a stable isotope of [MP PET 1995] |
| A. | Radium |
| B. | Carbon |
| C. | Lead |
| D. | Neptunium |
| Answer» D. Neptunium | |
| 1349. |
Of the following radiations, the one most easily stopped by air is [MP PMT 1991] |
| A. | \[\alpha \]-rays |
| B. | \[\beta \]-rays |
| C. | \[\gamma \]-rays |
| D. | X-rays |
| Answer» B. \[\beta \]-rays | |
| 1350. |
A magnet will cause the greatest deflection of [MP PMT 1991] |
| A. | \[\gamma \]-rays |
| B. | \[\beta \]-rays |
| C. | \[\alpha \]-rays |
| D. | Neutrons |
| Answer» C. \[\alpha \]-rays | |