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.
| 3401. |
Among the following gases which one has the lowest root mean square velocity at \[{{25}^{o}}C\] [EAMCET 1983] |
| A. | \[S{{O}_{2}}\] |
| B. | \[{{N}_{2}}\] |
| C. | \[{{O}_{2}}\] |
| D. | \[C{{l}_{2}}\] |
| Answer» E. | |
| 3402. |
The average kinetic energy of an ideal gas per molecule in SI units at \[{{25}^{o}}C\] will be [CBSE PMT 1996] |
| A. | \[6.17\times {{10}^{-21}}\,kJ\] |
| B. | \[6.17\times {{10}^{-21}}\,J\] |
| C. | \[6.17\times {{10}^{-20}}\,J\] |
| D. | \[6.17\times {{10}^{-20}}\,J\] |
| Answer» C. \[6.17\times {{10}^{-20}}\,J\] | |
| 3403. |
At \[{{27}^{o}}C\], the ratio of rms velocities of ozone to oxygen is [EAMCET 1992] |
| A. | \[\sqrt{3/5}\] |
| B. | \[\sqrt{4/3}\] |
| C. | \[\sqrt{2/3}\] |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 3404. |
If the \[{{v}_{rms}}\] is \[30{{R}^{1/2}}\] at \[{{27}^{o}}C\] then calculate the molar mass of gas in kilogram. [DPMT 2005] |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 0.001 |
| Answer» E. | |
| 3405. |
The temperature at which RMS velocity of \[S{{O}_{2}}\] molecules is half that of He molecules at 300 K is [NTSE 1991] |
| A. | 150 K |
| B. | 600 K |
| C. | 900 K |
| D. | 1200 K |
| Answer» E. | |
| 3406. |
Which of the following has maximum root mean square velocity at the same temperature [Manipal PMT 2002] |
| A. | \[S{{O}_{2}}\] |
| B. | \[C{{O}_{2}}\] |
| C. | \[{{O}_{2}}\] |
| D. | \[{{H}_{2}}\] |
| Answer» E. | |
| 3407. |
Ratio of average to most probable velocity is [Orissa JEE 2005] |
| A. | 1.128 |
| B. | 1.224 |
| C. | 1.0 |
| D. | 1.112 |
| Answer» B. 1.224 | |
| 3408. |
The root mean square velocity of one mole of a monoatomic having molar mass M is \[{{U}_{rms}}\]. The relation between the average kinetic energy of the \[{{U}_{rms}}\] is [IIT-JEE Screening 2004] |
| A. | \[{{U}_{rms}}=\sqrt{\frac{3E}{2M}}\] |
| B. | \[{{U}_{rms}}=\sqrt{\frac{2E}{3M}}\] |
| C. | \[{{U}_{rms}}=\sqrt{\frac{2E}{M}}\] |
| D. | \[{{U}_{rms}}=\sqrt{\frac{E}{3M}}\] |
| Answer» D. \[{{U}_{rms}}=\sqrt{\frac{E}{3M}}\] | |
| 3409. |
What is the pressure of 2 mole of \[N{{H}_{3}}\] at \[{{27}^{o}}C\] when its volume is 5 litre in vander Waal?s equation (a = 4.17, b = 0.03711) [JEE Orissa 2004] |
| A. | 10.33 atm |
| B. | 9.33 atm |
| C. | 9.74 atm |
| D. | 9.2 atm |
| Answer» C. 9.74 atm | |
| 3410. |
The r.m.s. velocity of a gas depends upon [DCE 2002] |
| A. | Temperature only |
| B. | Molecular mass only |
| C. | Temperature and molecular mass of gas |
| D. | None of these |
| Answer» D. None of these | |
| 3411. |
The r.m.s. velocity of a certain gas is \[v\] at \[300K\]. The temperature, at which the r.m.s. velocity becomes double [Pb. CET 2002] |
| A. | \[1200K\] |
| B. | \[900\,K\] |
| C. | \[600K\] |
| D. | \[150K\] |
| Answer» B. \[900\,K\] | |
| 3412. |
The ratio of most probable velocity to that of average velocity is [JEE Orissa 2004] |
| A. | \[\pi /2\] |
| B. | \[2/\pi \] |
| C. | \[\sqrt{\pi }/2\] |
| D. | \[2/\sqrt{\pi }\] |
| Answer» D. \[2/\sqrt{\pi }\] | |
| 3413. |
Choose the correct arrangement, where the symbols have their usual meanings |
| A. | \[\bar{u}>{{u}_{p}}>{{u}_{rms}}\] |
| B. | \[{{u}_{rms}}>\bar{u}>{{u}_{p}}\] |
| C. | \[{{u}_{p}}>\bar{u}>{{u}_{rms}}\] |
| D. | \[{{u}_{p}}>{{u}_{rms}}>\bar{u}\] |
| Answer» C. \[{{u}_{p}}>\bar{u}>{{u}_{rms}}\] | |
| 3414. |
Which is not true in case of an ideal gas [CBSE PMT 1991] |
| A. | It cannot be converted into a liquid |
| B. | There is no interaction between the molecules |
| C. | All molecules of the gas move with same speed |
| D. | At a given temperature, PV is proportional to the amount of the gas |
| Answer» D. At a given temperature, PV is proportional to the amount of the gas | |
| 3415. |
The rms speed of \[{{N}_{2}}\] molecules in a gas is u. If the temperature is doubled and the nitrogen molecules dissociate into nitrogen atoms, the rms speed becomes |
| A. | \[u/2\] |
| B. | 2u |
| C. | 4u |
| D. | 14u |
| Answer» C. 4u | |
| 3416. |
Consider a mixture of \[S{{O}_{2}}\] and \[{{O}_{2}}\] kept at room temperature. Compared to the oxygen molecule, the \[S{{O}_{2}}\] molecule will hit the wall with |
| A. | Smaller average speed |
| B. | Greater average speed |
| C. | Greater kinetic energy |
| D. | Greater mass |
| Answer» E. | |
| 3417. |
The root mean square velocity of an ideal gas at constant pressure varies density as [IIT 2000] |
| A. | \[{{d}^{2}}\] |
| B. | d |
| C. | \[\sqrt{d}\] |
| D. | \[1/\sqrt{d}\] |
| Answer» E. | |
| 3418. |
The ratio between the root mean square velocity of H2 at 50 K and that of \[{{O}_{2}}\] at 800 K is [IIT 1996] |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| D. | ¼ |
| Answer» D. ¼ | |
| 3419. |
The temperature of the gas is raised from \[{{27}^{o}}C\] to \[{{927}^{o}}C\], the root mean square velocity is [CBSE PMT 1994] |
| A. | \[\sqrt{927/27}\]times the earlier value |
| B. | Same as before |
| C. | Halved |
| D. | Doubled |
| Answer» E. | |
| 3420. |
Molecular velocities of the two gases at the same temperature are \[{{u}_{1}}\] and \[{{u}_{2}}\]. Their masses are \[{{m}_{1}}\] and \[{{m}_{2}}\] respectively. Which of the following expressions is correct [BHU 1994] |
| A. | \[\frac{{{m}_{1}}}{u_{1}^{2}}=\frac{{{m}_{2}}}{u_{2}^{2}}\] |
| B. | \[{{m}_{1}}{{u}_{1}}={{m}_{2}}{{u}_{2}}\] |
| C. | \[\frac{{{m}_{1}}}{{{u}_{1}}}=\frac{{{m}_{2}}}{{{u}_{2}}}\] |
| D. | \[{{m}_{1}}u_{1}^{2}={{m}_{2}}u_{2}^{2}\] |
| Answer» E. | |
| 3421. |
At constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with increase in temperature due to [IIT 1992] |
| A. | Increase in the average molecular speed |
| B. | Increased rate of collision amongst molecules |
| C. | Increase in molecular attraction |
| D. | Decrease in mean free path |
| Answer» B. Increased rate of collision amongst molecules | |
| 3422. |
Root mean square velocity of a gas molecule is proportional to [CBSE PMT 1990] |
| A. | \[{{m}^{1/2}}\] |
| B. | \[{{m}^{0}}\] |
| C. | \[{{m}^{-1/2}}\] |
| D. | m |
| Answer» D. m | |
| 3423. |
The rms velocity at NTP of the species can be calculated from the expression [EAMCET 1990] |
| A. | \[\sqrt{\frac{3P}{d}}\] |
| B. | \[\sqrt{\frac{3\,PV}{M}}\] |
| C. | \[\sqrt{\frac{3\,RT}{M}}\] |
| D. | All the above |
| Answer» E. | |
| 3424. |
The root mean square velocity of an ideal gas in a closed container of fixed volume is increased from \[5\times {{10}^{4}}\,cm\,{{s}^{-1}}\] to \[10\times {{10}^{4}}\,cm\,{{s}^{-1}}\]. Which of the following statement correctly explains how the change is accomplished [Pb. CET 1986] |
| A. | By heating the gas, the temperature is doubled |
| B. | By heating the gas, the pressure is quadrupled (i.e. made four times) |
| C. | By heating the gas, the temperature is quadrupled |
| D. | By heating the gas, the pressure is doubled |
| Answer» C. By heating the gas, the temperature is quadrupled | |
| 3425. |
The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is [IIT 1981] |
| A. | 1.086 : 1 |
| B. | 1 : 1.086 |
| C. | 2 : 1.086 |
| D. | 1.086 : 2 |
| Answer» B. 1 : 1.086 | |
| 3426. |
Oxygen molecule is paramagnetic because [NCERT 1984; IIT 1984] |
| A. | Bonding electrons are more than antibonding electrons |
| B. | Contains unpaired electrons |
| C. | Bonding electrons are less than antibonding electrons |
| D. | Bonding electrons are equal to antibonding electrons |
| Answer» D. Bonding electrons are equal to antibonding electrons | |
| 3427. |
Among the following molecules which one have smallest bond angle [Orissa JEE 2005] |
| A. | \[N{{H}_{3}}\] |
| B. | \[P{{H}_{3}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[{{H}_{2}}Sc\] |
| E. | \[{{H}_{2}}S\] |
| Answer» E. \[{{H}_{2}}S\] | |
| 3428. |
Which of the following is paramagnetic [DPMT 2005] |
| A. | \[{{N}_{2}}\] |
| B. | \[{{C}_{2}}\] |
| C. | \[N_{2}^{+}\] |
| D. | \[O_{2}^{2-}\] |
| Answer» D. \[O_{2}^{2-}\] | |
| 3429. |
Correct order of bond length is [Orissa JEE 2005] |
| A. | \[CO_{3}^{2-}>C{{O}_{2}}>CO\] |
| B. | \[C{{O}_{2}}>CO>CO_{3}^{2-}\] |
| C. | \[CO>C{{O}_{2}}>CO_{3}^{2-}\] |
| D. | None of these |
| Answer» B. \[C{{O}_{2}}>CO>CO_{3}^{2-}\] | |
| 3430. |
The correct order in which the O ? O bond length increases in the following is [BHU 2000; CBSE PMT 2005] |
| A. | \[{{H}_{2}}{{O}_{2}}<{{O}_{2}}<{{O}_{3}}\] |
| B. | \[{{O}_{2}}<{{H}_{2}}{{O}_{2}}<{{O}_{3}}\] |
| C. | \[{{O}_{2}}<{{O}_{3}}<{{H}_{2}}{{O}_{2}}\] |
| D. | \[{{O}_{3}}<{{H}_{2}}{{O}_{2}}<{{O}_{2}}\] |
| Answer» D. \[{{O}_{3}}<{{H}_{2}}{{O}_{2}}<{{O}_{2}}\] | |
| 3431. |
Which of the following species have maximum number of unpaired electrons [AIIMS 1983] |
| A. | \[{{O}_{2}}\] |
| B. | \[O_{2}^{+}\] |
| C. | \[O_{2}^{-}\] |
| D. | \[O_{2}^{2-}\] |
| Answer» B. \[O_{2}^{+}\] | |
| 3432. |
The bond order of a molecule is given by [NCERT 1984] |
| A. | The difference between the number of electrons in bonding and antibonding orbitals |
| B. | Total number of electrons in bonding and antibonding orbitals |
| C. | Twice the difference between the number of electrons in bonding and antibonding electrons |
| D. | Half the difference between the number of electrons in bonding and antibonding electrons |
| Answer» C. Twice the difference between the number of electrons in bonding and antibonding electrons | |
| 3433. |
Which of the following is not paramagnetic [DCE 2002] |
| A. | \[{{O}_{2}}\] |
| B. | \[O_{2}^{2+}\] |
| C. | \[O_{2}^{2-}\] |
| D. | \[O_{2}^{-}\] |
| Answer» D. \[O_{2}^{-}\] | |
| 3434. |
In \[O_{2}^{-},\] \[{{O}_{2}}\] and \[O_{2}^{-2}\] molecular species, the total number of antibonding electrons respectively are [DCE 2003] |
| A. | 7, 6, 8 |
| B. | 1, 0, 2 |
| C. | 6, 6, 6 |
| D. | 8, 6, 8 |
| Answer» B. 1, 0, 2 | |
| 3435. |
Which has the highest bond energy [DCE 2002] |
| A. | \[{{F}_{2}}\] |
| B. | \[C{{l}_{2}}\] |
| C. | \[B{{r}_{2}}\] |
| D. | \[{{I}_{2}}\] |
| Answer» C. \[B{{r}_{2}}\] | |
| 3436. |
The paramagnetic molecule at ground state among the following is [UPSEAT 2004] |
| A. | \[{{H}_{2}}\] |
| B. | \[{{O}_{2}}\] |
| C. | \[{{N}_{2}}\] |
| D. | \[CO\] |
| Answer» C. \[{{N}_{2}}\] | |
| 3437. |
Which of the following is paramagnetic [UPSEAT 2004] |
| A. | \[{{B}_{2}}\] |
| B. | \[{{C}_{2}}\] |
| C. | \[{{N}_{2}}\] |
| D. | \[{{F}_{2}}\] |
| Answer» B. \[{{C}_{2}}\] | |
| 3438. |
Which of the following is diamagnetic [BVP 2004] |
| A. | Oxygen molecule |
| B. | Boron molecule |
| C. | \[N_{2}^{+}\] |
| D. | None |
| Answer» E. | |
| 3439. |
The bond order in NO is 2.5 while that in \[N{{O}^{+}}\]is 3. Which of the following statements is true for these two species [AIEEE 2004] |
| A. | Bond length in \[N{{O}^{+}}\]is equal to that in \[NO\] |
| B. | Bond length in \[NO\]is greater than in \[N{{O}^{+}}\] |
| C. | Bond length in \[N{{O}^{+}}\]is greater than in \[NO\] |
| D. | Bond length is unpredictable |
| Answer» C. Bond length in \[N{{O}^{+}}\]is greater than in \[NO\] | |
| 3440. |
According to molecular orbital theory which of the following statement about the magnetic character and bond order is correct regarding \[O_{2}^{+}\] [IIT JEE Screening 2004] |
| A. | Paramagnetic and bond order<\[{{O}_{2}}\] |
| B. | Paramagnetic and bond order>\[{{O}_{2}}\] |
| C. | Dimagnetic and bond order<\[{{O}_{2}}\] |
| D. | Dimagnetic and bond order>\[{{O}_{2}}\] |
| Answer» C. Dimagnetic and bond order<\[{{O}_{2}}\] | |
| 3441. |
The bond length the species \[{{O}_{2}},O_{2}^{+}\]and \[O_{2}^{-}\] are in the order of [MP PET 2004] |
| A. | \[O_{2}^{+}>{{O}_{2}}>O_{2}^{-}\] |
| B. | \[O_{2}^{+}>O_{2}^{-}>{{O}_{2}}\] |
| C. | \[{{O}_{2}}>O_{2}^{+}>O_{2}^{-}\] |
| D. | \[O_{2}^{-}>{{O}_{2}}>O_{2}^{+}\] |
| Answer» B. \[O_{2}^{+}>O_{2}^{-}>{{O}_{2}}\] | |
| 3442. |
The total number of electron that takes part in forming bonds in \[{{N}_{2}}\]is [MP PET 2004] |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 10 |
| Answer» D. 10 | |
| 3443. |
The bond order of \[O_{2}^{+}\] is the same as in [CPMT 2004] |
| A. | \[N_{2}^{+}\] |
| B. | \[C{{N}^{-}}\] |
| C. | \[CO\] |
| D. | \[N{{O}^{+}}\] |
| Answer» B. \[C{{N}^{-}}\] | |
| 3444. |
Bond order of \[{{O}_{2}}\]is [DPMT 2004] |
| A. | 2 |
| B. | 1.5 |
| C. | 3 |
| D. | 3.5 |
| Answer» B. 1.5 | |
| 3445. |
In \[PO_{4}^{3-}\]ion, the formal charge on each oxygen atom and \[P-O\]bond order respectively are [DPMT 2004] |
| A. | \[-0.75,\ 1.25\] |
| B. | \[-0.75,\ 1.0\] |
| C. | \[-0.75,\ 0.6\] |
| D. | \[-3,\ 1.25\] |
| Answer» B. \[-0.75,\ 1.0\] | |
| 3446. |
The paramagnetic property of the oxygen molecule due to the presence of unpaired electorns present in [Kerala PMT 2004] |
| A. | \[{{(\sigma 2{{p}_{x}})}^{1}}\] and \[{{({{\sigma }^{*}}2{{p}_{x}})}^{1}}\] |
| B. | \[{{(\sigma 2{{p}_{x}})}^{1}}\]and \[{{(\pi 2{{p}_{y}})}^{1}}\] |
| C. | \[{{(\pi *2{{p}_{y}})}^{1}}\] and \[{{(\pi *2{{p}_{z}})}^{1}}\] |
| D. | \[{{(\pi *2{{p}_{y}})}^{1}}\]and \[{{(\pi 2{{p}_{y}})}^{1}}\] |
| E. | \[{{(\pi *2{{p}_{z}})}^{1}}\] and \[{{(\pi 2{{p}_{z}})}^{1}}\] |
| Answer» D. \[{{(\pi *2{{p}_{y}})}^{1}}\]and \[{{(\pi 2{{p}_{y}})}^{1}}\] | |
| 3447. |
From elementary molecular orbital theory we can give the electronic configuration of the singly positive nitrogen molecular ion \[N_{2}^{+}\] as [UPSEAT 2003] |
| A. | \[\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\pi {{(2p)}^{4}}\sigma {{(2p)}^{1}}\] |
| B. | \[\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2p)}^{1}}\pi {{(2p)}^{3}}\] |
| C. | \[\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2p)}^{2}}\pi {{(2p)}^{4}}\] |
| D. | \[\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2p)}^{2}}\pi {{(2p)}^{2}}\] |
| Answer» B. \[\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2p)}^{1}}\pi {{(2p)}^{3}}\] | |
| 3448. |
The atomicity of phosphorus is X and the \[P\hat{P}P\] bond angle in the molecule is Y. What are X and Y [EAMCET 2003] |
| A. | X = 4, Y = \[{{90}^{o}}\] |
| B. | X = 4, Y = \[{{60}^{o}}\] |
| C. | X = 3, Y = \[{{120}^{o}}\] |
| D. | X = 2, Y = \[{{180}^{o}}\] |
| Answer» C. X = 3, Y = \[{{120}^{o}}\] | |
| 3449. |
How many bonding electron pairs are there in white phosphorous [MP PET 2003] |
| A. | 6 |
| B. | 12 |
| C. | 4 |
| D. | 8 |
| Answer» B. 12 | |
| 3450. |
Which of the following is paramagnetic [MP PET 2003] |
| A. | \[O_{2}^{+}\] |
| B. | \[C{{N}^{-}}\] |
| C. | CO |
| D. | \[{{N}_{2}}\] |
| Answer» B. \[C{{N}^{-}}\] | |