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.
| 3451. |
In which of the following pairs molecules have bond order three and are isoelectronics [MP PET 2003] |
| A. | \[C{{N}^{-}}\], CO |
| B. | \[N{{O}^{+}},\,\,C{{O}^{+}}\] |
| C. | \[C{{N}^{-}}\], \[O_{2}^{+}\] |
| D. | CO, \[O_{2}^{+}\] |
| Answer» B. \[N{{O}^{+}},\,\,C{{O}^{+}}\] | |
| 3452. |
Which of the following is correct for \[{{N}_{2}}\] triple bond [CPMT 2002] |
| A. | 3s |
| B. | 1p, 2s |
| C. | 2p, 1s |
| D. | 3p |
| Answer» D. 3p | |
| 3453. |
Which of the following species would be expected paramagnetic [UPSEAT 2002] |
| A. | Copper crystals |
| B. | \[C{{u}^{+}}\] |
| C. | \[C{{u}^{++}}\] |
| D. | \[{{H}_{2}}\] |
| Answer» D. \[{{H}_{2}}\] | |
| 3454. |
Which of the following molecule has highest bond energy [AIIMS 2002] |
| A. | \[F-F\] |
| B. | \[CC\] |
| C. | \[NN\] |
| D. | \[OO\] |
| Answer» D. \[OO\] | |
| 3455. |
In \[{{H}_{2}}{{O}_{2}}\]molecule, the angle between the two O ? H planes is [CBSE PMT 2002] |
| A. | \[{{90}^{o}}\] |
| B. | \[{{101}^{o}}\] |
| C. | \[{{103}^{o}}\] |
| D. | \[{{105}^{o}}\] |
| Answer» B. \[{{101}^{o}}\] | |
| 3456. |
Which one does not exhibit paramagnetism [DPMT 2000] |
| A. | \[Cl{{O}_{2}}\] |
| B. | \[ClO_{2}^{-}\] |
| C. | \[N{{O}_{2}}\] |
| D. | \[NO\] |
| Answer» C. \[N{{O}_{2}}\] | |
| 3457. |
The bond order is not three for [MP PMT 2001] |
| A. | \[N_{2}^{+}\] |
| B. | \[O_{2}^{2+}\] |
| C. | \[{{N}_{2}}\] |
| D. | \[N{{O}^{+}}\] |
| Answer» B. \[O_{2}^{2+}\] | |
| 3458. |
In which of the following pairs the two molecules have identical bond order [MP PMT 2000] |
| A. | \[{{N}_{2}},O_{2}^{2+}\] |
| B. | \[{{N}_{2}}\], \[O_{2}^{-}\] |
| C. | \[N_{2}^{-}\], \[{{O}_{2}}\] |
| D. | \[O_{2}^{+}\], \[{{N}_{2}}\] |
| Answer» B. \[{{N}_{2}}\], \[O_{2}^{-}\] | |
| 3459. |
The bond order of \[He_{2}^{+}\] molecule ion is [Pb. PMT 2000; Pb CET 2001] |
| A. | 1 |
| B. | 2 |
| C. | \[\frac{1}{2}\] |
| D. | \[\frac{1}{4}\] |
| Answer» D. \[\frac{1}{4}\] | |
| 3460. |
The number of antibonding electron pairs in \[O_{2}^{2-}\] molecular ion on the basis of molecular orbital theory is [Pb. PMT 2000] |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 5 |
| Answer» B. 3 | |
| 3461. |
The bond order is maximum in [AIIMS 1983, 85; CBSE PMT 1994; MP PET 2002] |
| A. | \[{{O}_{2}}\] |
| B. | \[O_{2}^{-1}\] |
| C. | \[O_{2}^{+1}\] |
| D. | \[O_{2}^{-2}\] |
| Answer» D. \[O_{2}^{-2}\] | |
| 3462. |
With increasing bond order, stability of a bond [CET Pune 1998] |
| A. | Remains unaltered |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» D. None of these | |
| 3463. |
Which one of the following molecules is paramagnetic [Pb. PMT 1998] |
| A. | \[C{{O}_{2}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[NO\] |
| D. | \[{{H}_{2}}O\] |
| Answer» D. \[{{H}_{2}}O\] | |
| 3464. |
\[{{N}_{2}}\] and \[{{O}_{2}}\] are converted into monoanions \[N_{2}^{-}\] and \[O_{2}^{-}\] respectively, which of the following statements is wrong [CBSE PMT 1997] |
| A. | In \[{{N}_{2}},\] the \[N-N\] bond weakens |
| B. | In \[{{O}_{2}},\] the \[O-O\] bond order increases |
| C. | In\[{{O}_{2}},\] bond length increases |
| D. | \[N_{2}^{-}\] becomes diamagnetic |
| Answer» C. In\[{{O}_{2}},\] bond length increases | |
| 3465. |
Which of the following is not paramagnetic [AIIMS 1997] |
| A. | \[{{S}^{-2}}\] |
| B. | \[{{N}_{2}}^{-}\] |
| C. | \[O_{2}^{-}\] |
| D. | \[NO\] |
| Answer» B. \[{{N}_{2}}^{-}\] | |
| 3466. |
What is correct sequence of bond order [BHU 1997] |
| 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» C. \[{{O}_{2}}>O_{2}^{-}>O_{2}^{+}\] | |
| 3467. |
Atomic number of an element is 26. The element shows [CPMT 1996] |
| A. | Ferromagnetism |
| B. | Diamagnetism |
| C. | Paramagnetism |
| D. | None of these |
| Answer» B. Diamagnetism | |
| 3468. |
Which of the following molecular orbitals has two nodal planes [KCET 1996] |
| A. | \[\sigma \,2s\] |
| B. | \[\pi \,2{{p}_{y}}\] |
| C. | \[{{\pi }^{*}}\,2{{p}_{y}}\] |
| D. | \[{{\sigma }^{*}}\,2{{p}_{x}}\] |
| Answer» D. \[{{\sigma }^{*}}\,2{{p}_{x}}\] | |
| 3469. |
The number of nodal planes \['d'\] orbital has [KCET 1996] |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Three |
| Answer» D. Three | |
| 3470. |
Which of the following species is the least stable |
| A. | \[{{O}_{2}}\] |
| B. | \[O_{2}^{-2}\] |
| C. | \[O_{2}^{+1}\] |
| D. | \[O_{2}^{-1}\] |
| Answer» C. \[O_{2}^{+1}\] | |
| 3471. |
If \[{{N}_{x}}\]is the number of bonding orbitals of an atom and \[{{N}_{y}}\] is the number of antibonding orbitals, then the molecule/atom will be stable if [DPMT 1996] |
| A. | \[{{N}_{x}}>{{N}_{y}}\] |
| B. | \[{{N}_{x}}={{N}_{y}}\] |
| C. | \[{{N}_{x}}<{{N}_{y}}\] |
| D. | \[{{N}_{x}}\le {{N}_{y}}\] |
| Answer» B. \[{{N}_{x}}={{N}_{y}}\] | |
| 3472. |
Which of the following is paramagnetic [MP PET 1999] |
| A. | \[{{O}_{2}}\] |
| B. | \[C{{N}^{-}}\] |
| C. | \[CO\] |
| D. | \[N{{O}^{+}}\] |
| Answer» B. \[C{{N}^{-}}\] | |
| 3473. |
The difference in energy between the molecular orbital formed and the combining atomic orbitals is called |
| A. | Bond energy |
| B. | Activation energy |
| C. | Stabilization energy |
| D. | Destabilization energy |
| Answer» D. Destabilization energy | |
| 3474. |
According to molecular orbital theory, the paramagnetism of \[{{O}_{2}}\] molecule is due to presence of [MP PMT 1997] |
| A. | Unpaired electrons in the bonding \[\sigma \] molecular orbital |
| B. | Unpaired electrons in the antibonding \[\sigma \]molecular orbital |
| C. | Unpaired electron in the bonding \[\pi \] molecular orbital |
| D. | Unpaired electrons in the antibonding \[\pi \]molecular orbital |
| Answer» E. | |
| 3475. |
The bond order in \[O_{2}^{+}\] is [MP PET 1999; BHU 2001] |
| A. | 2 |
| B. | 2.5 |
| C. | 1.5 |
| D. | 3 |
| Answer» C. 1.5 | |
| 3476. |
The molecular orbital configuration of a diatomic molecule is \[\sigma \,\,1{{s}^{2}}\,\,{{\sigma }^{*}}\,\,1{{s}^{2}}\,\sigma \,\,2{{s}^{2}}\,{{\sigma }^{*}}\,2{{s}^{2}}\,\,\sigma \,2p_{x}^{2}\,\left\{ {}_{\pi \,2p_{z}^{2}}^{\pi \,2p_{y}^{2}} \right.\] Its bond order is |
| A. | 3 |
| B. | 2.5 |
| C. | 2 |
| D. | 1 |
| Answer» B. 2.5 | |
| 3477. |
According to the molecular orbital theory, the bond order in \[{{C}_{2}}\] molecule is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 3478. |
Which of the following does not exist on the basis of molecular orbital theory [AFMC 1990; MP PMT 1996] |
| A. | \[H_{2}^{+}\] |
| B. | \[He_{2}^{+}\] |
| C. | \[H{{e}_{2}}\] |
| D. | \[L{{i}_{2}}\] |
| Answer» D. \[L{{i}_{2}}\] | |
| 3479. |
When two atomic orbitals combine they form |
| A. | One molecular orbital |
| B. | Two molecular orbital |
| C. | Three molecular orbital |
| D. | Four molecular orbital |
| Answer» C. Three molecular orbital | |
| 3480. |
In the electronic structure of acetic acid, there are [AMU 1983] |
| A. | 16 shared and 8 unshared electrons |
| B. | 8 shared and 16 unshared electrons |
| C. | 12 shared and 12 unshared electrons |
| D. | 18 shared and 6 unshared electrons |
| Answer» B. 8 shared and 16 unshared electrons | |
| 3481. |
The energy of a \[2p\]orbital except hydrogen atom is [AMU 1983] |
| A. | Less than that of \[s{{p}^{2}}\] orbital |
| B. | More than that of \[2s\]orbital |
| C. | Equal to that of \[2s\] orbital |
| D. | Double that of \[2s\] orbital |
| Answer» C. Equal to that of \[2s\] orbital | |
| 3482. |
Which one of the following is paramagnetic [DPMT 1985] |
| A. | \[{{H}_{2}}O\] |
| B. | \[N{{O}_{2}}\] |
| C. | \[S{{O}_{2}}\] |
| D. | \[C{{O}_{2}}\] |
| Answer» C. \[S{{O}_{2}}\] | |
| 3483. |
Paramagnetism is exhibited by molecules [NCERT 1979; MP PET 2002] |
| A. | Not attracted into a magnetic field |
| B. | Containing only paired electrons |
| C. | Carrying a positive charge |
| D. | Containing unpaired electrons |
| Answer» E. | |
| 3484. |
\[PC{{l}_{5}}\] exists but \[NC{{l}_{5}}\]does not because [EAMCET 1977; MP PET/PMT 1988] |
| A. | Nitrogen has no vacant d-orbitals |
| B. | \[NC{{l}_{5}}\]is unstable |
| C. | Nitrogen atom is much smaller |
| D. | Nitrogen is highly inert |
| Answer» B. \[NC{{l}_{5}}\]is unstable | |
| 3485. |
The bond order of individual carbon-carbon bonds in benzene is [IIT 1980] |
| A. | One |
| B. | Two |
| C. | Between 1 and 2 |
| D. | One and two alternately |
| Answer» D. One and two alternately | |
| 3486. |
An atom of an element A has three electrons in its outermost shell and that of B has six electrons in the outermost shell. The formula of the compound between these two will be [CPMT 1974, 84; RPMT 1999] |
| A. | \[{{A}_{3}}{{B}_{4}}\] |
| B. | \[{{A}_{2}}{{B}_{3}}\] |
| C. | \[{{A}_{3}}{{B}_{2}}\] |
| D. | \[{{A}_{2}}{{B}_{3}}\] |
| Answer» C. \[{{A}_{3}}{{B}_{2}}\] | |
| 3487. |
When two atoms of chlorine combine to form one molecule of chlorine gas, the energy of the molecule [AMU 1982] |
| A. | Greater than that of separate atoms |
| B. | Equal to that of separate atoms |
| C. | Lower than that of separate atoms |
| D. | None of the above statement is correct |
| Answer» D. None of the above statement is correct | |
| 3488. |
Which one is paramagnetic and has the bond order 1/2 [NCERT 1983] |
| A. | \[{{O}_{2}}\] |
| B. | \[{{N}_{2}}\] |
| C. | \[{{F}_{2}}\] |
| D. | \[H_{2}^{+}\] |
| Answer» E. | |
| 3489. |
The bond order in \[{{N}_{2}}\] molecule is [CBSE 1995; Pb. PMT 1999; MP PET 1997] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 3490. |
The bond order of \[NO\] molecule is [MP PET 1996] |
| A. | 1 |
| B. | 2 |
| C. | 2.5 |
| D. | 3 |
| Answer» D. 3 | |
| 3491. |
Which one of the following oxides is expected exhibit paramagnetic behaviour [CBSE PMT 2005] |
| A. | \[C{{O}_{2}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[Cl{{O}_{2}}\] |
| D. | \[Si{{O}_{2}}\] |
| Answer» D. \[Si{{O}_{2}}\] | |
| 3492. |
Which one of the following species is diamagnetic in nature [AIEEE 2005] |
| A. | \[He_{2}^{+}\] |
| B. | H2 |
| C. | \[H_{2}^{+}\] |
| D. | \[H_{2}^{-}\] |
| Answer» C. \[H_{2}^{+}\] | |
| 3493. |
In which case the bond length is minimum between carbon and nitrogen |
| A. | \[C{{H}_{3}}N{{H}_{2}}\] |
| B. | \[{{C}_{6}}{{H}_{5}}CH=NOH\] |
| C. | \[C{{H}_{3}}CON{{H}_{2}}\] |
| D. | \[C{{H}_{3}}CN\] |
| Answer» E. | |
| 3494. |
The paramagnetic nature of oxygen molecule is best explained on the basis of [BHU 1996] |
| A. | Valence bond theory |
| B. | Resonance |
| C. | Molecular orbital theory |
| D. | Hybridization |
| Answer» D. Hybridization | |
| 3495. |
The molecular electronic configuration of \[H_{2}^{-}\] ion is |
| A. | \[{{\left( \sigma \,1s \right)}^{2}}\] |
| B. | \[{{\left( \sigma \,1s \right)}^{2}}{{\left( {{\sigma }^{x}}1s \right)}^{2}}\] |
| C. | \[NO\] |
| D. | \[{{\left( \sigma \,1s \right)}^{3}}\] |
| Answer» D. \[{{\left( \sigma \,1s \right)}^{3}}\] | |
| 3496. |
Which molecule has the highest bond order |
| A. | \[{{N}_{2}}\] |
| B. | \[L{{i}_{2}}\] |
| C. | \[H{{e}_{2}}\] |
| D. | \[{{O}_{2}}\] |
| Answer» B. \[L{{i}_{2}}\] | |
| 3497. |
Which of the following molecule is paramagnetic [CPMT 1980; RPET 1999;MP PMT 1999; RPMT 2000] |
| A. | Chlorine |
| B. | Nitrogen |
| C. | Oxygen |
| D. | Hydrogen |
| Answer» D. Hydrogen | |
| 3498. |
Out of the following which has smallest bond length [RPMT 1997] |
| A. | \[{{O}_{2}}\] |
| B. | \[O_{2}^{+}\] |
| C. | \[O_{2}^{-}\] |
| D. | \[O_{2}^{2-}\] |
| Answer» C. \[O_{2}^{-}\] | |
| 3499. |
The bond order in \[C{{H}_{3}}Cl\] ion is [Pb. CET 2004] |
| A. | 1 |
| B. | 2 |
| C. | 2.5 |
| D. | 3 |
| Answer» D. 3 | |
| 3500. |
Which one is paramagnetic from the following [IIT 1989; CBSE PMT 1995] |
| A. | \[O_{2}^{-}\] |
| B. | \[NO\] |
| C. | Both A and B |
| D. | \[C{{N}^{-}}\] |
| Answer» D. \[C{{N}^{-}}\] | |