MCQOPTIONS
Saved Bookmarks
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.
| 4351. |
For the reaction \[C(s)+C{{O}_{2}}(g)\] ⇌ \[2CO(g)\], the partial pressure of \[C{{O}_{2}}\] and \[CO\] are 2.0 and 4.0 atm respectively at equilibrium. The \[{{K}_{p}}\] for the reaction is [Roorkee 1990] |
| A. | 0.5 |
| B. | 4.0 |
| C. | 8.0 |
| D. | 32.0 |
| Answer» D. 32.0 | |
| 4352. |
\[K\] for the synthesis of \[HI\] is 50. \[K\] for dissociation of \[HI\] is [Roorkee 1990] |
| A. | 50 |
| B. | 5 |
| C. | 0.2 |
| D. | 0.02 |
| Answer» E. | |
| 4353. |
At a given temperature, the equilibrium constant for reaction \[PC{{l}_{5}}(g)\]⇌ \[PC{{l}_{3}}(g)+C{{l}_{2}}(g)\] is \[2.4\times {{10}^{-3}}\]. At the same temperature, the equilibrium constant for reaction \[PC{{l}_{3}}(g)+C{{l}_{2}}(g)\] ⇌ \[PC{{l}_{5}}(g)\] is [KCET 1992] |
| A. | \[2.4\times {{10}^{-3}}\] |
| B. | \[-2.4\times {{10}^{-3}}\] |
| C. | \[4.2\times {{10}^{2}}\] |
| D. | \[4.8\times {{10}^{-2}}\] |
| Answer» D. \[4.8\times {{10}^{-2}}\] | |
| 4354. |
\[{{H}_{2}}+{{I}_{2}}\]⇌\[2HI\] In the above equilibrium system if the concentration of the reactants at \[{{25}^{o}}C\] is increased, the value of \[{{K}_{c}}\] will [BHU 1979; CPMT 1990; CBSE PMT 1990] |
| A. | Increase |
| B. | Decrease |
| C. | Remains the same |
| D. | Depends on the nature of the reactants |
| Answer» D. Depends on the nature of the reactants | |
| 4355. |
Two gaseous equilibria \[S{{O}_{2(g)}}+\frac{1}{2}{{O}_{2(g)}}\] ⇌ \[S{{O}_{3(g)}}\] and \[2S{{O}_{3(g)}}\]⇌\[2S{{O}_{2(g)}}+{{O}_{2(g)}}\] have equilibrium constants \[{{K}_{1}}\] and \[{{K}_{2}}\] respectively at \[298\,K\]. Which of the following relationships between \[{{K}_{1}}\] and \[{{K}_{2}}\] is correct [CPMT 1988; CBSE PMT 1989; MP PET 1993, 95; RPMT 1999; MP PMT 2001] |
| A. | \[{{K}_{1}}={{K}_{2}}\] |
| B. | \[{{K}_{2}}=K_{1}^{2}\] |
| C. | \[{{K}_{2}}=\frac{1}{K_{1}^{2}}\] |
| D. | \[{{K}_{2}}=\frac{1}{{{K}_{1}}}\] |
| Answer» D. \[{{K}_{2}}=\frac{1}{{{K}_{1}}}\] | |
| 4356. |
In which of the following equilibria, the value of \[{{K}_{p}}\] is less than \[{{K}_{c}}\] [MP PMT 1993] |
| A. | \[{{H}_{2}}+{{I}_{2}}\]⇌ \[2HI\] |
| B. | \[{{N}_{2}}+3{{H}_{2}}\]⇌\[2N{{H}_{3}}\] |
| C. | \[{{N}_{2}}+{{O}_{2}}\]⇌ \[2NO\] |
| D. | \[CO+{{H}_{2}}O\]⇌ \[C{{O}_{2}}+{{H}_{2}}\] |
| Answer» C. \[{{N}_{2}}+{{O}_{2}}\]⇌ \[2NO\] | |
| 4357. |
In which of the following reaction, the value of \[{{K}_{p}}\] will be equal to \[{{K}_{c}}\] [MP PMT 1995] |
| A. | \[{{H}_{2}}+{{I}_{2}}\]⇌ \[2HI\] |
| B. | \[PC{{l}_{5}}\] ⇌ \[PC{{l}_{3}}+C{{l}_{2}}\] |
| C. | \[2N{{H}_{3}}\] ⇌ \[{{N}_{2}}+3{{H}_{2}}\] |
| D. | \[2S{{O}_{2}}+{{O}_{2}}\]⇌\[2S{{O}_{3}}\] |
| Answer» B. \[PC{{l}_{5}}\] ⇌ \[PC{{l}_{3}}+C{{l}_{2}}\] | |
| 4358. |
Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is [IIT 1982] |
| A. | Two times that of a hydrogen molecule |
| B. | Same as that of a hydrogen molecule |
| C. | Four times that of a hydrogen molecule |
| D. | Half that of a hydrogen molecule |
| Answer» C. Four times that of a hydrogen molecule | |
| 4359. |
The translational kinetic energy of an ideal gas depends only on its |
| A. | Pressure |
| B. | Force |
| C. | Temperature |
| D. | Molar mass |
| Answer» D. Molar mass | |
| 4360. |
The kinetic theory of gases perdicts that total kinetic energy of a gaseous assembly depends on [NCERT 1984] |
| A. | Pressure of the gas |
| B. | Temperature of the gas |
| C. | Volume of the gas |
| D. | Pressure, volume and temperature of the gas |
| Answer» C. Volume of the gas | |
| 4361. |
According to kinetic theory of gases, the energy per mole of a gas is equal to [EAMCET 1985] |
| A. | 1.5 RT |
| B. | RT |
| C. | 0.5 RT |
| D. | 2.5 RT |
| Answer» B. RT | |
| 4362. |
Kinetic energy of a gas depends upon its[Bihar MADT 1982] |
| A. | Molecular mass |
| B. | Atomic mass |
| C. | Equivalent mass |
| D. | None of these |
| Answer» E. | |
| 4363. |
The density of a gas An is three times that of a gas B. if the molecular mass of A is M, the molecular mass of B is [CPMT 1987] |
| A. | 3 M |
| B. | \[\sqrt{3}\]M |
| C. | \[M/3\] |
| D. | \[M/\sqrt{3}\] |
| Answer» D. \[M/\sqrt{3}\] | |
| 4364. |
In deriving the kinetic gas equation, use is made of the root mean square velocity of the molecules because it is [Bihar MADT 1980] |
| A. | The average velocity of the molecules |
| B. | The most probable velocity of the molecules |
| C. | The square root of the average square velocity of the molecules |
| D. | The most accurate form in which velocity can be used in these calculations |
| Answer» E. | |
| 4365. |
At the same temperature and pressure, which of the following gases will have the highest kinetic energy per mole [MNR 1991] |
| A. | Hydrogen |
| B. | Oxygen |
| C. | Methane |
| D. | All the same |
| Answer» E. | |
| 4366. |
Consider the following statements : (1) Joule-Thomson experiment is isoenthalpic as well as adiabatic. (2) A negative value of \[{{\mu }_{JT}}\] (Joule Thomson coefficient corresponds to warming of a gas on expansion. (3) The temperature at which neither cooling nor heating effect is observed is known as inversion temperature. Which of the above statements are correct |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 4367. |
Vibrational energy is [Pb. CET 1985] |
| A. | Partially potential and partially kinetic |
| B. | Only potential |
| C. | Only kinetic |
| D. | None of the above |
| Answer» B. Only potential | |
| 4368. |
Absolute zero is defined as the temperature [CBSE PMT 1990] |
| A. | At which all molecular motion ceases |
| B. | At which liquid helium boils |
| C. | At which ether boils |
| D. | All of the above |
| Answer» B. At which liquid helium boils | |
| 4369. |
The density of neon will be highest at [CBSE PMT 1990] |
| A. | S.T.P. |
| B. | \[{{0}^{o}}C,\,2\,atm\] |
| C. | \[{{273}^{o}}C,\,1\,atm\] |
| D. | \[{{273}^{o}}C,\,2\,atm\] |
| Answer» C. \[{{273}^{o}}C,\,1\,atm\] | |
| 4370. |
The density of air is 0.00130 g/ml. The vapour density of air will be [DCE 2000] |
| A. | 0.00065 |
| B. | 0.65 |
| C. | 14.4816 |
| D. | 14.56 |
| Answer» E. | |
| 4371. |
The ratio g for inert gases is [AFMC 1990] |
| A. | 1.33 |
| B. | 1.66 |
| C. | 2.13 |
| D. | 1.99 |
| Answer» C. 2.13 | |
| 4372. |
At \[{{100}^{o}}C\] and 1 atm, if the density of liquid water is 1.0 g \[c{{m}^{-3}}\] and that of water vapour is 0.0006 g \[{{m}^{-3}}\], then the volume occupied by water molecules in 1 litre of steam at that temperature is [IIT 2000] |
| A. | 6 \[c{{m}^{3}}\] |
| B. | 60 \[c{{m}^{3}}\] |
| C. | 0.6 \[c{{m}^{3}}\] |
| D. | 0.06 \[c{{m}^{3}}\] |
| Answer» D. 0.06 \[c{{m}^{3}}\] | |
| 4373. |
Ratio of \[{{C}_{p}}\] and \[{{C}_{v}}\] of a gas 'X' is 1.4. The number of atoms of the gas 'X' present in 11.2 litres of it at N.T.P. is [CBSE PMT 1989] |
| A. | \[6.02\times {{10}^{23}}\] |
| B. | \[1.2\times {{10}^{24}}\] |
| C. | \[3.01\times {{10}^{23}}\] |
| D. | \[2.01\times {{10}^{23}}\] |
| Answer» B. \[1.2\times {{10}^{24}}\] | |
| 4374. |
If the inversion temperature of a gas is \[-{{80}^{o}}C\], then it will produce cooling under Joule-Thomson effect at |
| A. | 298 K |
| B. | 273 K |
| C. | 193 K |
| D. | 173 K |
| Answer» E. | |
| 4375. |
According to kinetic theory of gases, [EAMCET 1980] |
| A. | There are intermolecular attractions |
| B. | Molecules have considerable volume |
| C. | No intermolecular attractions |
| D. | The velocity of molecules decreases after each collision |
| Answer» D. The velocity of molecules decreases after each collision | |
| 4376. |
An ideal gas will have maximum density when [CPMT 2000] |
| A. | \[P=0.5\,atm,\,T=600\,K\] |
| B. | \[P=2\,atm,\,T=150\,K\] |
| C. | \[P=1\,atm,\,T=300\,K\] |
| D. | \[P=1.0\,atm,\,T=500\,K\] |
| Answer» C. \[P=1\,atm,\,T=300\,K\] | |
| 4377. |
If P, V, M, T and R are pressure, volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by [CBSE PMT 1989, 91] |
| A. | \[\frac{RT}{PM}\] |
| B. | \[\frac{P}{RT}\] |
| C. | \[\frac{M}{V}\] |
| D. | \[\frac{PM}{RT}\] |
| Answer» E. | |
| 4378. |
Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas [AIEEE 2005] |
| A. | The most probable speed increases |
| B. | The fraction of the molecules with the most probable speed increases |
| C. | The distribution becomes broader |
| D. | The area under the distribution curve remains the same as under the lower temperature |
| Answer» C. The distribution becomes broader | |
| 4379. |
With increase of pressure, the mean free path [Pb. CET 1985] |
| A. | Decreases |
| B. | Increases |
| C. | Does not change |
| D. | Becomes zero |
| Answer» B. Increases | |
| 4380. |
Indicate the correct statement for a 1-L sample of \[{{N}_{2}}(g)\] and \[C{{O}_{2}}(g)\] at 298 K and 1 atm pressure |
| A. | The average translational KE per molecule is the same in \[{{N}_{2}}\] and \[C{{O}_{2}}\] |
| B. | The rms speed remains constant for both \[{{N}_{2}}\] and \[C{{O}_{2}}\] |
| C. | The density of \[{{N}_{2}}\] is less than that of \[C{{O}_{2}}\] |
| D. | The total translational KE of both \[{{N}_{2}}\] and \[C{{O}_{2}}\] is the same |
| Answer» B. The rms speed remains constant for both \[{{N}_{2}}\] and \[C{{O}_{2}}\] | |
| 4381. |
At STP, 0.50 mol \[{{H}_{2}}\] gas and 1.0 mol He gas [CBSE PMT 1993, 2000] |
| A. | Have equal average kinetic energies |
| B. | Have equal molecular speeds |
| C. | Occupy equal volumes |
| D. | Have equal effusion rates |
| Answer» B. Have equal molecular speeds | |
| 4382. |
According to kinetic theory of gases, for a diatomic molecule [MNR 1991] |
| A. | The pressure exerted by the gas is proportional to the mean velocity of the molecules |
| B. | The pressure exerted by the gas is proportional to the root mean square velocity of the molecules |
| C. | The root mean square velocity is inversely proportional to the temperature |
| D. | The mean translational kinetic energy of the molecules is proportional to the absolute temperature |
| Answer» E. | |
| 4383. |
The average K.E. of an ideal gas in calories per mole is approximately equal to [EAMCET 1989] |
| A. | Three times the absolute temperature |
| B. | Absolute temperature |
| C. | Two times the absolute temperature |
| D. | 1.5 times the absolute temperature |
| Answer» B. Absolute temperature | |
| 4384. |
Which of the following is valid at absolute zero [Pb. CET 1985] |
| A. | Kinetic energy of the gas becomes zero but the molecular motion does not become zero |
| B. | Kinetic energy of the gas becomes zero and molecular motion also becomes zero |
| C. | Kinetic energy of the gas decreases but does not become zero |
| D. | None of the above |
| Answer» C. Kinetic energy of the gas decreases but does not become zero | |
| 4385. |
Postulate of kinetic theory is [EAMCET 1980] |
| A. | Atom is indivisible |
| B. | Gases combine in a simple ratio |
| C. | There is no influence of gravity on the molecules of a gas |
| D. | None of the above |
| Answer» E. | |
| 4386. |
Which isotope on bombardment with \[\alpha \]-particles will give \[_{8}{{O}^{17}}\] and \[_{1}{{H}^{1}}\] [NCERT 1983] |
| A. | \[_{8}{{O}^{16}}\] |
| B. | \[_{7}{{N}^{14}}\] |
| C. | \[_{7}{{N}^{15}}\] |
| D. | \[_{6}{{C}^{14}}\] |
| Answer» C. \[_{7}{{N}^{15}}\] | |
| 4387. |
Elements having different nuclear charge but the same mass number are called [NCERT 1974; MP PMT 1991; CBSE PMT 1991; CPMT 1989; EAMCET 1992] |
| A. | Isotopes |
| B. | Isobars |
| C. | Isomers |
| D. | Isotones |
| Answer» C. Isomers | |
| 4388. |
In treatment of cancer, which of the following isotope is used [DPMT 1985; BHU 1995; KCET 1999; AMU 1999; Pb.CET 2001; MP PET 2002; Kurukshetra CET 2002] |
| A. | \[_{53}{{I}^{131}}\] |
| B. | \[_{15}{{P}^{32}}\] |
| C. | \[_{27}C{{o}^{60}}\] |
| D. | \[_{1}{{H}^{2}}\] |
| Answer» D. \[_{1}{{H}^{2}}\] | |
| 4389. |
Successive emission of an \[\alpha \]-particle and two \[\beta \]-particles by an atom of an element results in the formation of its [MP PMT/PET 1988; BHU 1979] |
| A. | Isobar |
| B. | Isomorph |
| C. | Isotope |
| D. | Isomer |
| Answer» D. Isomer | |
| 4390. |
An isotone of \[_{32}^{76}Ge\]is (one or more are correct) [IIT 1984; MADT Bihar 1995; MP PMT 1995] |
| A. | \[_{32}^{77}Ge\] |
| B. | \[_{33}^{77}As\] |
| C. | \[_{34}^{77}Se\] |
| D. | \[_{34}^{78}Se\] |
| Answer» C. \[_{34}^{77}Se\] | |
| 4391. |
Which among the following isotope is not found in natural uranium [Orissa JEE 2002] |
| A. | \[_{92}{{U}^{234}}\] |
| B. | \[_{92}{{U}^{235}}\] |
| C. | \[_{92}{{U}^{238}}\] |
| D. | \[_{92}{{U}^{239}}\] |
| Answer» C. \[_{92}{{U}^{238}}\] | |
| 4392. |
Which of the following are pairs of isotopes [Bihar CEE 1982] |
| A. | \[_{1}^{2}{{H}^{+}}\] and \[_{1}^{3}H\] |
| B. | \[_{1}^{3}H\] and \[_{2}^{4}{{H}^{-}}\] |
| C. | \[_{2}^{3}He\] and \[_{2}^{4}He\] |
| D. | \[_{6}^{12}C\] and \[_{7}^{14}{{N}^{+}}\] |
| Answer» B. \[_{1}^{3}H\] and \[_{2}^{4}{{H}^{-}}\] | |
| 4393. |
Which of the following are iso-electronic [CBSE 2002] |
| A. | \[C{{O}_{2}}\] and \[NO\] |
| B. | \[S{{O}_{2}}\] and\[C{{O}_{2}}\] |
| C. | \[CN\] and \[CO\] |
| D. | \[N{{O}_{2}}\] and \[C{{O}_{2}}\] |
| Answer» D. \[N{{O}_{2}}\] and \[C{{O}_{2}}\] | |
| 4394. |
Isotopes were discovered by [AMU 1983; AFMC 1995] |
| A. | Aston |
| B. | Soddy |
| C. | Thomson |
| D. | Millikan |
| Answer» C. Thomson | |
| 4395. |
An ordinary oxygen contains [NCERT 1977] |
| A. | Only \[O-16\] isotopes |
| B. | Only \[O-17\] isotopes |
| C. | A mixture of \[O-16\] and \[O-18\] isotopes |
| D. | A mixture of O ? 16, \[O-17\] and \[O-18\] isotopes |
| Answer» E. | |
| 4396. |
In chlorine gas, ratio of \[C{{l}^{35}}\] and \[C{{l}^{37}}\]is [BHU 1984; CPMT 1977, 80] |
| A. | 1 : 3 |
| B. | 3 : 1 |
| C. | 1 : 1 |
| D. | 1 : 4 |
| Answer» C. 1 : 1 | |
| 4397. |
Isotopes of same elements have the same number of [BHU 1984; DPMT 1983; CPMT 1972, 78; AFMC 2000, 01] |
| A. | Protons |
| B. | Neutrons |
| C. | Deutrons |
| D. | None |
| Answer» B. Neutrons | |
| 4398. |
Isotopes are atoms having the same [EAMCET 1978, 79; MP PMT 1980; CPMT 1973; BHU 2001; AFMC 2003] |
| A. | Atomic mass |
| B. | Mass number |
| C. | Atomic number |
| D. | Number of neutrons |
| Answer» D. Number of neutrons | |
| 4399. |
Radioactive isotope of hydrogen is [MP PMT 2001; MPPET 2003] |
| A. | Tritium |
| B. | Deuterium |
| C. | Para hydrogen |
| D. | Ortho hydrogen |
| Answer» B. Deuterium | |
| 4400. |
The isobars are atoms with the same number of [DPMT 1982; CPMT 1994] |
| A. | Protons |
| B. | Neutrons |
| C. | Protons and neutrons |
| D. | Nucleons |
| Answer» E. | |