MCQOPTIONS
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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.
| 7351. |
Which of the following is correct for critical temperature |
| A. | It is the highest temperature at which liquid and vapour can coexist |
| B. | Beyond the critical temperature, there is no distinction between the two phases and a gas cannot be liquefied by compression |
| C. | At critical temperature \[({{T}_{c}})\] the surface tension of the system is zero |
| D. | At critical temperature the gas and the liquid phases have different critical densities |
| Answer» B. Beyond the critical temperature, there is no distinction between the two phases and a gas cannot be liquefied by compression | |
| 7352. |
A gas can be liquefied [AFMC 2005] |
| A. | Above its critical temperature |
| B. | At its critical temperature |
| C. | Below its critical temperature |
| D. | At any temperature |
| Answer» D. At any temperature | |
| 7353. |
An ideal gas obeying kinetic theory of gases can be liquefied if [CBSE PMT 1995] |
| A. | Its temperature is more than critical temperature \[{{T}_{c}}\] |
| B. | Its pressure is more than critical pressure \[{{P}_{c}}\] |
| C. | Its pressure is more than \[{{P}_{c}}\] at a temperature less than \[{{T}_{c}}\] |
| D. | It cannot be liquefied at any value of P and T |
| Answer» E. | |
| 7354. |
However great the pressure, a gas cannot be liquefied above its |
| A. | Boyle temperature |
| B. | Inversion temperature |
| C. | Critical temperature |
| D. | Room temperature |
| Answer» D. Room temperature | |
| 7355. |
An ideal gas can't be liquefied because [CBSE PMT 1992] |
| A. | Its critical temperature is always above \[{{0}^{o}}C\] |
| B. | Its molecules are relatively smaller in size |
| C. | It solidifies before becoming a liquid |
| D. | Forces operative between its molecules are negligible |
| Answer» E. | |
| 7356. |
Weight of 112 ml of oxygen at NTP on liquefaction would be [DPMT 1984] |
| A. | 0.32 g |
| B. | 0.64 g |
| C. | 0.16 g |
| D. | 0.96 g |
| Answer» D. 0.96 g | |
| 7357. |
Which set of conditions represents easiest way to liquefy a gas [NCERT 1983] |
| A. | Low temperature and high pressure |
| B. | High temperature and low pressure |
| C. | Low temperature and low pressure |
| D. | High temperature and high pressure |
| Answer» B. High temperature and low pressure | |
| 7358. |
The electron pair which forms a bond between two similar non-metallic atoms will be [IIT 1986] |
| A. | Dissimilar shared between the two |
| B. | By complete transfer from one atom to other |
| C. | In a similar spin condition |
| D. | Equally shared in between the two |
| Answer» E. | |
| 7359. |
With which of the given pairs CO2 resembles [BHU 2005] |
| A. | HgCl2, C2H2 |
| B. | HgCl2, SnCl4 |
| C. | C2H2, NO2 |
| D. | N2O and NO2 |
| Answer» B. HgCl2, SnCl4 | |
| 7360. |
Among \[Ca{{H}_{2}},N{{H}_{3}},NaH\] and \[{{B}_{2}}{{H}_{6}}\], which are covalent hydride [Orissa JEE 2005] |
| A. | \[N{{H}_{3}}\ \text{and}\ {{\text{B}}_{\text{2}}}{{H}_{6}}\] |
| B. | \[NaH\ \text{and}\ \text{Ca}{{\text{H}}_{\text{2}}}\] |
| C. | NaH and \[N{{H}_{3}}\] |
| D. | \[Ca{{H}_{2}}\] and \[{{B}_{2}}{{H}_{6}}\] |
| Answer» B. \[NaH\ \text{and}\ \text{Ca}{{\text{H}}_{\text{2}}}\] | |
| 7361. |
Which of the following statements is correct for covalent bond [BHU 1997] |
| A. | Electrons are shared between two atoms |
| B. | It may be polar or non-polar |
| C. | Direction is non-polar |
| D. | Valency electrons are attracted |
| Answer» B. It may be polar or non-polar | |
| 7362. |
Which of the following does not obey the octet rule [EAMCET 1993] |
| A. | \[CO\] |
| B. | \[N{{H}_{3}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[PC{{l}_{5}}\] |
| Answer» B. \[N{{H}_{3}}\] | |
| 7363. |
The major binding force of diamond, silicon and quartz is [Kerala CET (Med.) 2002] |
| A. | Electrostatic force |
| B. | Electrical attraction |
| C. | Co-valent bond force |
| D. | Non-covalent bond force |
| Answer» D. Non-covalent bond force | |
| 7364. |
Strongest bond is [AFMC 1987] |
| A. | \[C-C\] |
| B. | \[C-H\] |
| C. | \[C-N\] |
| D. | \[C-O\] |
| Answer» D. \[C-O\] | |
| 7365. |
Hydrogen atoms are held together to form hydrogen molecules by [AMU 1982] |
| A. | Hydrogen bond |
| B. | Ionic bond |
| C. | Covalent bond |
| D. | Dative bond |
| Answer» D. Dative bond | |
| 7366. |
Number of electrons in the valence orbit of nitrogen in an ammonia molecule are [MH CET 2004] |
| A. | 8 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» C. 6 | |
| 7367. |
Which of the following substances has giant covalent structure [DPMT 1985, 86; NCERT 1975] |
| A. | Iodine crystal |
| B. | Solid \[C{{O}_{2}}\] |
| C. | Silica |
| D. | White phosphorus |
| Answer» D. White phosphorus | |
| 7368. |
Carbon has a valency of 2 in \[CO\] and 4 in\[C{{O}_{2}}\] and \[C{{H}_{4}}\]. Its valency in acetylene \[\left( {{C}_{2}}{{H}_{2}} \right)\] is [NCERT 1971] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 7369. |
In \[{{H}_{2}}{{O}_{2}}\], the two oxygen atoms have |
| A. | Electrovalent bond |
| B. | Covalent bond |
| C. | Coordinate bond |
| D. | No bond |
| Answer» C. Coordinate bond | |
| 7370. |
The following element forms a molecule with eight its own weight atoms [MHCET 2004] |
| A. | \[Si\] |
| B. | \[S\] |
| C. | \[Cl\] |
| D. | \[P\] |
| Answer» C. \[Cl\] | |
| 7371. |
Which of the following has covalent bond [AFMC 1988; DCE 2004] |
| A. | \[N{{a}_{2}}S\] |
| B. | \[AlC{{l}_{3}}\] |
| C. | \[NaH\] |
| D. | \[MgC{{l}_{2}}\] |
| Answer» C. \[NaH\] | |
| 7372. |
\[{{H}_{2}}S\] is more acidic than \[{{H}_{2}}O\], due to [BVP 2004] |
| A. | \[O\] is more electronegative than \[S\] |
| B. | \[O-H\] bond is stronger than \[S-H\] bond |
| C. | \[O-H\] bond is weaker than \[S-H\] bond |
| D. | None of these |
| Answer» C. \[O-H\] bond is weaker than \[S-H\] bond | |
| 7373. |
Which type of bond is present in \[{{H}_{2}}S\] molecule [MHCET 2003; Pb CET 2001] |
| A. | Ionic bond |
| B. | Covalent bond |
| C. | Co-ordinate |
| D. | All of three |
| Answer» C. Co-ordinate | |
| 7374. |
The following salt shows maximum covalent character [UPSEAT 2004] |
| A. | \[AlC{{l}_{3}}\] |
| B. | \[MgC{{l}_{2}}\] |
| C. | \[CsCl\] |
| D. | \[LaC{{l}_{3}}\] |
| Answer» B. \[MgC{{l}_{2}}\] | |
| 7375. |
The acid having \[O-O\] bond is [IIT JEE Screening 2004] |
| A. | \[{{H}_{2}}{{S}_{2}}{{O}_{3}}\] |
| B. | \[{{H}_{2}}{{S}_{2}}{{O}_{6}}\] |
| C. | \[{{H}_{2}}{{S}_{2}}{{O}_{8}}\] |
| D. | \[{{H}_{2}}{{S}_{4}}{{O}_{6}}\] |
| Answer» D. \[{{H}_{2}}{{S}_{4}}{{O}_{6}}\] | |
| 7376. |
The nature of bonding in graphite is [DPMT 1986; CPMT 1986] |
| A. | Covalent |
| B. | Ionic |
| C. | Metallic |
| D. | Coordinate |
| Answer» B. Ionic | |
| 7377. |
Among the species : \[C{{O}_{2}},C{{H}_{3}}CO{{O}^{-}},\] \[CO,C{{O}_{3}}^{2-},\] HCHO which has the weakest carbon- oxygen bond [Kerala PMT 2004] |
| A. | \[C{{O}_{2}}\] |
| B. | \[C{{H}_{3}}CO{{O}^{-}}\] |
| C. | CO |
| D. | \[C{{O}_{3}}^{2-}\] |
| E. | HCHO |
| Answer» E. HCHO | |
| 7378. |
Which of the following is Lewis acid [RPET 2003] |
| A. | \[B{{F}_{3}}\] |
| B. | \[N{{H}_{3}}\] |
| C. | \[P{{H}_{3}}\] |
| D. | \[S{{O}_{2}}\] |
| Answer» B. \[N{{H}_{3}}\] | |
| 7379. |
Covalent compounds have low melting point because [KCET 2002] |
| A. | Covalent bond is less exothermic |
| B. | Covalent molecules have definite shape |
| C. | Covalent bond is weaker than ionic bond |
| D. | Covalent molecules are held by weak Vander Waal?s force of attraction |
| Answer» E. | |
| 7380. |
Two elements X and Y have following electron configurations X \[=1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{6}},\,\,3{{s}^{2}}3{{p}^{6}},\,\,4{{s}^{2}}\] and Y \[=1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{6}},\,\,3{{s}^{2}}3{{p}^{6}}\] The compound formed by combination of X and Y is [DPMT 2001] |
| A. | \[X{{Y}_{5}}\] |
| B. | \[{{X}_{2}}{{Y}_{5}}\] |
| C. | \[{{X}_{5}}{{Y}_{3}}\] |
| D. | \[X{{Y}_{2}}\] |
| Answer» E. | |
| 7381. |
Which of the following atoms has minimum covalent radius [DPMT 2000] |
| A. | B |
| B. | C |
| C. | N |
| D. | Si |
| Answer» D. Si | |
| 7382. |
Which of the following substances when dissolved in water will give a solution that does not conduct electricity [JIPMER 1999] |
| A. | Hydrogen chloride |
| B. | Potassium hydroxide |
| C. | Sodium acetate |
| D. | Urea |
| Answer» E. | |
| 7383. |
The number of electrons shared by each outermost shell of \[{{N}_{2}}\] is [AFMC 1998] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 7384. |
The valency of \[A=3\] and \[B=2\], then the compound is [Bihar MEE 1997] |
| A. | \[{{A}_{2}}{{B}_{3}}\] |
| B. | \[{{A}_{3}}{{B}_{2}}\] |
| C. | \[{{A}_{3}}{{B}_{3}}\] |
| D. | \[{{A}_{2}}{{B}_{2}}\] |
| E. | None of these |
| Answer» B. \[{{A}_{3}}{{B}_{2}}\] | |
| 7385. |
If a molecule \[{{X}_{2}}\] has a triple bond, then \[X\]will have the electronic configuration [CET Pune 1998] |
| A. | \[1{{s}^{2}}\,\,2{{s}^{2}}\,2{{p}^{5}}\] |
| B. | \[1{{s}^{2}}\,\,2{{s}^{2}}\,2{{p}^{3}}\] |
| C. | \[1{{s}^{2}}\,2{{s}^{1}}\] |
| D. | \[1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{1}}\] |
| Answer» C. \[1{{s}^{2}}\,2{{s}^{1}}\] | |
| 7386. |
Which of the following compounds does not follow the octet rule for electron distribution [CET Pune 1998] |
| A. | \[PC{{l}_{5}}\] |
| B. | \[PC{{l}_{3}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[P{{H}_{3}}\] |
| Answer» B. \[PC{{l}_{3}}\] | |
| 7387. |
The table shown below gives the bond dissociation energies \[({{E}_{diss}})\] for single covalent bonds of carbon atoms with element \[A,\,\,B,\,\,C\]and \[D.\] Which element has the smallest atoms [CBSE PMT 1994] Bond \[{{E}_{diss}}\,(kJ\,\,mo{{l}^{-1}})\] \[C-A\] 240 \[C-B\] 328 \[C-C\] 276 \[C-D\] 485 |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 7388. |
If the electronic configuration of \[M=2,\,\,8,\,\,3\] and that of \[A=2,\,\,8,\,\,7,\] the formula of the compound is [Bihar MEE 1996] |
| A. | \[{{M}_{2}}{{A}_{3}}\] |
| B. | \[M{{A}_{2}}\] |
| C. | \[{{M}_{2}}A\] |
| D. | \[M{{A}_{3}}\] |
| E. | \[{{M}_{3}}A\] |
| Answer» E. \[{{M}_{3}}A\] | |
| 7389. |
Which of the following statements regarding covalent bond is not true [MP PET/PMT 1998] |
| A. | The electrons are shared between atoms |
| B. | The bond is non-directional |
| C. | The strength of the bond depends upon the extent of overlapping |
| D. | The bond formed may or may not be polar |
| Answer» C. The strength of the bond depends upon the extent of overlapping | |
| 7390. |
The electronic configuration of a metal \[M\] is \[1{{s}^{2}},\,\,2{{s}^{2}}\,2{{p}^{6}},\,\,3{{s}^{1}}.\] The formula of its oxides will be [MP PET/PMT 1998] |
| A. | \[MO\] |
| B. | \[{{M}_{2}}O\] |
| C. | \[{{M}_{2}}{{O}_{3}}\] |
| D. | \[M{{O}_{2}}\] |
| Answer» C. \[{{M}_{2}}{{O}_{3}}\] | |
| 7391. |
A covalent bond between two atoms is formed by which of the following [MP PMT 1996] |
| A. | Electron nuclear attraction |
| B. | Electron sharing |
| C. | Electron transfer |
| D. | Electrostatic attraction |
| Answer» C. Electron transfer | |
| 7392. |
Which is the correct electron dot structure of \[{{N}_{2}}O\]molecule [MP PET 1996] |
| A. | \[:\,N=N=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,\] |
| B. | \[:\,N\equiv {{N}^{+}}-\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,{{:}^{-}}\] |
| C. | \[\underset{.\,.}{\overset{.\,.}{\mathop{N}}}\,=\overset{.\,.}{\mathop{N}}\,=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,\] |
| D. | \[:\,N=N=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,:\] |
| Answer» C. \[\underset{.\,.}{\overset{.\,.}{\mathop{N}}}\,=\overset{.\,.}{\mathop{N}}\,=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,\] | |
| 7393. |
Atoms in the water molecule are linked by [MP PAT 1996] |
| A. | Electrovalent bond |
| B. | Covalent bond |
| C. | Coordinate covalent bond |
| D. | Odd electron bond |
| Answer» C. Coordinate covalent bond | |
| 7394. |
Among the following which property is commonly exhibited by a covalent compound [MP PET 1994] |
| A. | High solubility in water |
| B. | High electrical conductance |
| C. | Low boiling point |
| D. | High melting point |
| Answer» D. High melting point | |
| 7395. |
In covalency [CPMT 1974, 76, 78, 81; AFMC 1982] |
| A. | Electrons are transferred |
| B. | Electrons are equally shared |
| C. | The electron of one atom are shared between two atoms |
| D. | None of the above |
| Answer» C. The electron of one atom are shared between two atoms | |
| 7396. |
Highest covalent character is found in [EAMCET 1992] |
| A. | \[Ca{{F}_{2}}\] |
| B. | \[CaC{{l}_{2}}\] |
| C. | \[CaB{{r}_{2}}\] |
| D. | \[Ca{{I}_{2}}\] |
| Answer» E. | |
| 7397. |
Ionic and covalent bonds are present in [CBSE PMT 1990; MNR 1990; KCET 2000; UPSEAT 2001] |
| A. | \[CC{{l}_{4}}\] |
| B. | \[CaC{{l}_{2}}\] |
| C. | \[N{{H}_{4}}Cl\] |
| D. | \[{{H}_{2}}O\] |
| Answer» D. \[{{H}_{2}}O\] | |
| 7398. |
On analysis, a certain compound was found to contain iodine and oxygen in the ratio of \[254\,\,gm\] of iodine and \[80\,\,gm\] of oxygen. The atomic mass of iodine is 127 and that of oxygen is 16. Which of the following is the formula of the compound [CPMT 1981] |
| A. | \[IO\] |
| B. | \[{{I}_{2}}O\] |
| C. | \[{{I}_{5}}{{O}_{2}}\] |
| D. | \[{{I}_{2}}{{O}_{5}}\] |
| Answer» E. | |
| 7399. |
As compared to covalent compounds, electrovalent compounds generally have [CPMT 1990, 94; MP PMT 1997] |
| A. | Low melting points and low boiling points |
| B. | Low melting points and high boiling points |
| C. | High melting points and low boiling points |
| D. | High melting points and high boiling points |
| Answer» E. | |
| 7400. |
Hydrogen chloride molecule contains a [CPMT 1984] |
| A. | Covalent bond |
| B. | Double bond |
| C. | Coordinate bond |
| D. | Electrovalent bond |
| Answer» B. Double bond | |