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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.
| 801. |
An element having electronic configuration \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}4{{s}^{1}}\] forms |
| A. | Acidic oxide |
| B. | Basic oxide |
| C. | Amphoteric oxide |
| D. | Neutral oxide |
| Answer» C. Amphoteric oxide | |
| 802. |
Which is the correct order of second ionization potential of \[C,\text{ }N,\text{ O}\] and F in the following? |
| A. | \[O>N>F>C\] |
| B. | \[O>F>N>C\] |
| C. | \[F>O>N>C\] |
| D. | \[C>N>O>F\] |
| Answer» C. \[F>O>N>C\] | |
| 803. |
The first \[({{\Delta }_{i}}{{H}_{1}})\] and second \[({{\Delta }_{i}}{{H}_{2}})\] ionization enthalpies (in \[kJ\text{ }mo{{l}^{-1}}\]) and the electron gain enthalpy \[({{\Delta }_{eg}}H)\] (in \[kg\,\,mo{{l}^{-1}}\]) of the elements I, II, III, IV and V are given below.Element\[{{\Delta }_{i}}{{H}_{1}}\]\[{{\Delta }_{i}}{{H}_{2}}\]\[{{\Delta }_{eg}}H\]I5207300\[-\,60\]II4193051\[-\,48\]III16813374\[-\,328\]IV10081846\[-\,295\]V23725251+48The most reactive metal and the least reactive non-metal of these are respectively |
| A. | I and V |
| B. | V and II |
| C. | II and V |
| D. | IV and V |
| Answer» D. IV and V | |
| 804. |
The screening effect of inner electrons of the nucleus causes |
| A. | decrease in the ionization energy |
| B. | increase in the ionization energy |
| C. | no effect on the ionization energy |
| D. | increases the attraction of the nucleus for the electrons |
| Answer» B. increase in the ionization energy | |
| 805. |
The incorrect statement among the following is |
| A. | the first ionization potential of Al is less than the first ionization potential of Mg |
| B. | the second ionization potential of Mg is greater than the second ionization potential of Na |
| C. | the first ionization potential of Na is less than the first ionization potential of Mg |
| D. | the third ionization potential of Mg is greater than the third ionization potential of Al. |
| Answer» C. the first ionization potential of Na is less than the first ionization potential of Mg | |
| 806. |
The decreasing order of the ionization potential of the following elements is |
| A. | \[Ne>Cl>P>S>Al>Mg\] |
| B. | \[Ne>Cl>P>S>Mg>Al\] |
| C. | \[Ne>Cl>S>P>Mg>Al\] |
| D. | \[Ne>Cl>S>P>Al>Mg\] |
| Answer» C. \[Ne>Cl>S>P>Mg>Al\] | |
| 807. |
An element X occurs in short period having configuration \[n{{s}^{2}}n{{p}^{1}}\]. The formula and nature of its oxide is |
| A. | \[X{{O}_{3}}\], basic |
| B. | \[X{{O}_{3}}\] acidic |
| C. | \[{{X}_{2}}{{O}_{3}},\] amphoteric |
| D. | \[{{X}_{2}}{{O}_{3}}\]basic |
| Answer» D. \[{{X}_{2}}{{O}_{3}}\]basic | |
| 808. |
Elements X, Y and Z have atomic numbers 19, 37 and 55 respectively. Which of the following statements is true about them? |
| A. | Their ionization potential would increase with increasing atomic number |
| B. | 'Y' would have an ionisation potential between those of 'X' and 'Z' |
| C. | 'Z' would have the highest ionization potential |
| D. | 'Y' would have the highest ionization potential. |
| Answer» C. 'Z' would have the highest ionization potential | |
| 809. |
Which one of the following has largest ionic radius? |
| A. | \[L{{i}^{+}}\] |
| B. | \[O_{2}^{2-}\] |
| C. | \[{{B}^{3+}}\] |
| D. | \[~{{F}^{-}}\] |
| Answer» B. \[O_{2}^{2-}\] | |
| 810. |
An element of atomic weight 40 has 2, 8, 8, 2 as the electronic configuration. Which one of the following statements regarding this element is not correct? |
| A. | it belongs to II group of the periodic table |
| B. | it has 20 neutrons |
| C. | the formula of its oxide is \[M{{O}_{2}}\] |
| D. | it belongs to 4th period of the periodic table |
| Answer» D. it belongs to 4th period of the periodic table | |
| 811. |
Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species\[{{O}^{2-}},{{S}^{2-}},{{N}^{3-}},{{P}^{3-}}\]? |
| A. | \[{{O}^{2-}}<{{N}^{3-}}<{{S}^{2-}}<{{P}^{3-}}\] |
| B. | \[{{O}^{2-}}<{{P}^{3-}}<{{N}^{3-}}<{{S}^{2-}}\] |
| C. | \[{{N}^{3}}<{{O}^{2-}}<{{P}^{3-}}<{{S}^{2-}}\] |
| D. | \[{{N}^{3-}}<{{S}^{2-}}<{{O}^{2-}}<{{P}^{3-}}\] |
| Answer» B. \[{{O}^{2-}}<{{P}^{3-}}<{{N}^{3-}}<{{S}^{2-}}\] | |
| 812. |
The correct order of acidic strength: |
| A. | \[C{{l}_{2}}{{O}_{7}}>S{{O}_{2}}>{{P}_{4}}{{O}_{10}}\] |
| B. | \[{{K}_{2}}O>CaO>MgO\] |
| C. | \[C{{O}_{2}}>{{N}_{2}}{{O}_{5}}>S{{O}_{3}}\] |
| D. | \[N{{a}_{2}}O>MgO>A{{l}_{2}}{{O}_{3}}\] |
| Answer» B. \[{{K}_{2}}O>CaO>MgO\] | |
| 813. |
In which of the following process highest energy is absorbed? |
| A. | \[Cu\to C{{u}^{+}}\] |
| B. | \[Br\to B{{r}^{-}}\] |
| C. | \[~I\to {{I}^{-}}\] |
| D. | \[Li\to L{{i}^{-}}\] |
| Answer» B. \[Br\to B{{r}^{-}}\] | |
| 814. |
Consider the following changes \[A\to {{A}^{+}}+{{e}^{-}}:{{E}_{1}}\] and \[{{A}^{+}}\to {{A}^{2+}}+{{e}^{-}}:{{E}_{2}}\].The energy required to pull out the two electrons are \[{{E}_{1}}\] and \[{{E}_{2}}\] respectively. The correct relationship between two energies would be |
| A. | \[{{E}_{1}}<{{E}_{2}}\] |
| B. | \[{{E}_{1}}={{E}_{2}}\] |
| C. | \[{{E}_{1}}>{{E}_{2}}\] |
| D. | \[{{E}_{1}}\ge {{E}_{2}}\] |
| Answer» B. \[{{E}_{1}}={{E}_{2}}\] | |
| 815. |
Correct order of first IP among following elements Be, B, C, N, O is |
| A. | \[B<Be<C<O<N\] |
| B. | \[B<Be<C<N<O\] |
| C. | \[Be<B<C<N<O\] |
| D. | \[Be<B<C<O<N\] |
| Answer» B. \[B<Be<C<N<O\] | |
| 816. |
Which of the following sequence correctly represents the decreasing acidic nature of oxides? |
| A. | \[L{{i}_{2}}O>BeO>{{B}_{2}}{{O}_{3}}>C{{O}_{2}}>{{N}_{2}}{{O}_{3}}\] |
| B. | \[{{N}_{2}}{{O}_{3}}>C{{O}_{2}}>{{B}_{2}}{{O}_{3}}>BeO>L{{i}_{2}}O\] |
| C. | \[C{{O}_{2}}>{{N}_{2}}{{O}_{3}}>{{B}_{2}}{{O}_{3}}>BeO>L{{i}_{2}}O\] |
| D. | \[{{B}_{2}}{{O}_{3}}>C{{O}_{2}}>{{N}_{2}}{{O}_{3}}>L{{i}_{2}}O>BeO\] |
| Answer» C. \[C{{O}_{2}}>{{N}_{2}}{{O}_{3}}>{{B}_{2}}{{O}_{3}}>BeO>L{{i}_{2}}O\] | |
| 817. |
The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is: |
| A. | Both are found together in nature |
| B. | Both have nearly the same size |
| C. | Both have similar electronic configuration |
| D. | The ratio of their charge and size (i.e. charge density) is nearly the same |
| Answer» E. | |
| 818. |
What is the correct order of electronegativity? |
| A. | \[{{M}^{-}}<{{M}^{2-}}<\text{ }{{M}^{3-}}<{{M}^{4-}}\] |
| B. | \[{{M}^{-}}>{{M}^{2}}^{-}>{{M}^{3}}^{-}>{{M}^{4}}^{-}\] |
| C. | \[{{M}^{-}}<{{M}^{2-}}>{{M}^{3-}}<{{M}^{4-}}\] |
| D. | \[{{M}^{4-}}<{{M}^{2-}}<{{M}^{3-}}<{{M}^{-}}\] |
| Answer» C. \[{{M}^{-}}<{{M}^{2-}}>{{M}^{3-}}<{{M}^{4-}}\] | |
| 819. |
What is the order of ionisation energies of the coinage metal |
| A. | \[Cu>Ag<Au\] |
| B. | \[Cu>Ag>Au\] |
| C. | \[Cu<Ag<Au\] |
| D. | \[Au>Ag<Cu\] |
| Answer» B. \[Cu>Ag>Au\] | |
| 820. |
The correct order of decreasing electronegativity values among the elements I-beryllium, II-oxygen, III-nitrogen and IV-magnesium is |
| A. | \[II>III>I>IV\] |
| B. | \[III>IV>II>I\] |
| C. | \[I>II>III>IV\] |
| D. | \[I>II>IV>III\] |
| Answer» B. \[III>IV>II>I\] | |
| 821. |
\[N{{a}^{+}},\ M{{g}^{2+}},A{{l}^{3+}}\] and \[S{{i}^{4+}}\] are isoelectronic. The order of their ionic size is |
| A. | \[N{{a}^{+}}>\ M{{g}^{2+}}<A{{l}^{3+}}<S{{i}^{4+}}\] |
| B. | \[N{{a}^{+}}<\ M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\] |
| C. | \[N{{a}^{+}}>\ M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\] |
| D. | \[N{{a}^{+}}<\ M{{g}^{2+}}>A{{l}^{3+}}<S{{i}^{4+}}\] |
| Answer» D. \[N{{a}^{+}}<\ M{{g}^{2+}}>A{{l}^{3+}}<S{{i}^{4+}}\] | |
| 822. |
Which pair of elements belongs to same group? |
| A. | Elements with atomic no. 17 and 38 |
| B. | Elements with atomic no. 20 and 40 |
| C. | Elements with atomic no. 17 and 53 |
| D. | Elements with atomic no. 11 and 33 |
| Answer» D. Elements with atomic no. 11 and 33 | |
| 823. |
The bond dissociation energy of \[B-F\] in\[~B{{F}_{3}}\] is \[646\text{ }kJ\text{ }mo{{l}^{-1}}\] whereas that of \[C-F\] in \[C{{F}_{4}}\] is\[515\text{ }kJ\text{ }mo{{l}^{-1}}\]. The correct reason for higher \[B-F\] bond dissociation energy as compared to that of \[C-F\] is |
| A. | stronger \[\sigma \] bond between B and F in\[~B{{F}_{3}}\] as compared to that between C and F in \[C{{F}_{4}}\]. |
| B. | significant \[p\pi -p\pi \] interaction between B and F in\[B{{F}_{3}}\] whereas there is no possibility of such interaction between C and F in\[C{{F}_{4}}\]. |
| C. | lower degree of \[p\pi -p\pi \] interaction between B and F in \[~B{{F}_{3}}\] than that between C and F in \[C{{F}_{4}}\] |
| D. | Smaller size of \[B-atom\] as compared to that of C-atom. |
| Answer» C. lower degree of \[p\pi -p\pi \] interaction between B and F in \[~B{{F}_{3}}\] than that between C and F in \[C{{F}_{4}}\] | |
| 824. |
The correct order of hybridization of the central atom in the following species \[N{{H}_{3}},{{[PtC{{l}_{4}}]}^{2+}},\text{ }PC{{l}_{5}}\] and \[BC{{l}_{3}}\] is |
| A. | \[ds{{p}^{2}},ds{{p}^{3}},s{{p}^{2}}and\,s{{p}^{3}}\] |
| B. | \[s{{p}^{3}},ds{{p}^{2}},s{{p}^{3}}d,s{{p}^{2}}\] |
| C. | \[ds{{p}^{2}},s{{p}^{2}},s{{p}^{3}},ds{{p}^{3}}\] |
| D. | \[ds{{p}^{2}},s{{p}^{3}},s{{p}^{2}},ds{{p}^{3}}\] |
| Answer» C. \[ds{{p}^{2}},s{{p}^{2}},s{{p}^{3}},ds{{p}^{3}}\] | |
| 825. |
The internuclear distances in \[~O-O\] bonds for \[O_{2}^{+},{{O}_{2}},O_{2}^{-}\] and \[O_{2}^{2-}\] respectively are: |
| A. | \[1.30\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.49\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.12\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.21\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| B. | \[1.49\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.21\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.12\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.30\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| C. | \[1.21\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.12\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.49\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.30\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| D. | \[1.12\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.21\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.30\overset{\text{o}}{\mathop{\text{A}}}\,,\text{ }1.49\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| Answer» E. | |
| 826. |
Bond order normally gives idea of stability of a molecular species. All the molecules viz. \[{{H}_{2}},L{{i}_{2}}\]and\[{{B}_{2}}\]have the same bond order yet they are not equally stable. Their stability order is |
| A. | \[{{H}_{2}}>L{{i}_{2}}>{{B}_{2}}\] |
| B. | \[L{{i}_{2}}>{{H}_{2}}>{{B}_{2}}\] |
| C. | \[L{{i}_{2}}>{{B}_{2}}>{{H}_{2}}\] |
| D. | \[{{B}_{2}}>{{H}_{2}}>L{{i}_{2}}\] |
| Answer» B. \[L{{i}_{2}}>{{H}_{2}}>{{B}_{2}}\] | |
| 827. |
The compound\[M{{X}_{4}}\]is tetrahedral. The number of\[\angle XMX\] formed in the compound are |
| A. | three |
| B. | four |
| C. | five |
| D. | six |
| Answer» E. | |
| 828. |
Which one of the following pairs of molecules will have permanent dipole moments for both members? |
| A. | \[N{{O}_{2}}\] and\[C{{O}_{2}}\] |
| B. | \[N{{O}_{2}}\] and \[{{O}_{3}}\] |
| C. | \[Si{{F}_{4}}\] and\[C{{O}_{2}}\] |
| D. | \[Si{{F}_{4}}\]and \[N{{O}_{2}}\] |
| Answer» C. \[Si{{F}_{4}}\] and\[C{{O}_{2}}\] | |
| 829. |
Which one of the following molecules is paramagnetic? |
| A. | \[{{N}_{2}}\] |
| B. | NO |
| C. | CO |
| D. | \[{{O}_{3}}\] |
| Answer» C. CO | |
| 830. |
Dipole moment is shown by |
| A. | 1, 4-dichlorobenzene |
| B. | cis -1, 2-dichlorobenzene |
| C. | trans -1,3-dichlorobenzene |
| D. | trans -2, 3-dichloro -2- butane |
| Answer» C. trans -1,3-dichlorobenzene | |
| 831. |
CaO and \[~NaCl\] have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of \[~NaCl\], the approximate lattice energy of \[CaO\] is |
| A. | U/2 |
| B. | U |
| C. | 4C |
| D. | 2 U |
| Answer» D. 2 U | |
| 832. |
Sulphur reacts with chlorine in 1 : 2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. What is the hybridisation state of central atom in the compound. |
| A. | \[s{{p}^{3}}\] |
| B. | \[s{{p}^{2}}\] |
| C. | sp |
| D. | \[ds{{p}^{2}}\] |
| Answer» B. \[s{{p}^{2}}\] | |
| 833. |
Which of the following substances has the least ionic character? |
| A. | \[FeC{{l}_{2}}\] |
| B. | \[ZnC{{l}_{2}}\] |
| C. | \[CdC{{l}_{2}}\] |
| D. | \[MgC{{l}_{2}}\] |
| Answer» C. \[CdC{{l}_{2}}\] | |
| 834. |
In piperidine the hybrid state assumed by N is |
| A. | \[sp\] |
| B. | \[s{{p}^{2}}\] |
| C. | \[s{{p}^{3}}\] |
| D. | \[ds{{p}^{2}}\] |
| Answer» D. \[ds{{p}^{2}}\] | |
| 835. |
In which of the following sets, all the given species are isostructural? |
| A. | \[CO{{ }_{2}},N{{O}_{2}},Cl{{O}_{2}},Si{{O}_{2}}\] |
| B. | \[PC{{l}_{3}},AlC{{l}_{3}},BC{{l}_{3}},SbC{{l}_{3}}\] |
| C. | \[B{{F}_{3}},N{{F}_{3}},P{{F}_{3}},Al{{F}_{3}}\] |
| D. | \[BF_{4}^{-},CC{{l}_{4}},NH_{4}^{+},PCl_{4}^{+}\] |
| Answer» E. | |
| 836. |
The true statements from the following are 1. \[P{{H}_{5}}\] and \[BiC{{l}_{5}}\] do not exist 2. \[p\pi -d\pi \] bond is present in \[S{{O}_{2}}\] 3. Electrons travel with the speed of light 4. \[Se{{F}_{4}}\]and \[C{{H}_{4}}\]have same shape 5. \[I_{3}^{+}\]has bent geometry |
| A. | 1, 3 |
| B. | 1, 2, 5 |
| C. | 1, 3, 5 |
| D. | 1, 2, 4 |
| Answer» C. 1, 3, 5 | |
| 837. |
The maximum number of \[~90{}^\circ \] angles between bond pair-bond pair of electrons is observed in |
| A. | \[ds{{p}^{2}}\] hybridization |
| B. | \[s{{p}^{3}}d\] hybridization |
| C. | \[ds{{p}^{3}}\] hybridization |
| D. | \[s{{p}^{3}}{{d}^{2}}\] hybridization |
| Answer» E. | |
| 838. |
The shape of \[IF_{6}^{-}\] is: |
| A. | Trigonally distorted octahedron |
| B. | Pyramidal |
| C. | Octahedral |
| D. | Square antiprism |
| Answer» B. Pyramidal | |
| 839. |
\[S{{F}_{2}},S{{F}_{4}}\] and \[S{{F}_{6}}\] have the hybridization at sulphur atom respectively as: |
| A. | \[s{{p}^{2}},s{{p}^{3}},s{{p}^{2}}{{d}^{2}}\] |
| B. | \[s{{p}^{3}},s{{p}^{3}},s{{p}^{3}}{{d}^{2}}\] |
| C. | \[s{{p}^{3}},s{{p}^{3}}d,s{{p}^{3}}{{d}^{2}}\] |
| D. | \[s{{p}^{3}},sp{{d}^{2}},{{d}^{2}}s{{p}^{3}}\] |
| Answer» D. \[s{{p}^{3}},sp{{d}^{2}},{{d}^{2}}s{{p}^{3}}\] | |
| 840. |
The group of molecules having identical shape is: |
| A. | \[PC{{l}_{5}},I{{F}_{5}},Xe{{O}_{2}}{{F}_{2}}\] |
| B. | \[B{{F}_{3}},PC{{l}_{3}},Xe{{O}_{3}}\] |
| C. | \[S{{F}_{4}},Xe{{F}_{4}},CC{{l}_{4}}\] |
| D. | \[Cl{{F}_{3}},XeO{{F}_{2}},Xe{{F}_{3}}^{+}\] |
| Answer» E. | |
| 841. |
In\[Xe{{F}_{2}},\,\,Xe{{F}_{4}}\] and \[Xe{{F}_{6}}\,,\] the number of lone pairs on Xe are respectively |
| A. | 2, 3, 1 |
| B. | 1, 2, 3 |
| C. | 4, 1, 2 |
| D. | 3, 2, 1 |
| Answer» E. | |
| 842. |
\[{{N}_{2}}\] and\[{{O}_{2}}\] are converted into monocations, \[N_{_{2}}^{+}\] and\[O_{_{2}}^{+}\] respectively. Which of the following statements is wrong? |
| A. | In \[N_{2}^{+},N-N\] bond weakens |
| B. | In \[O_{2}^{+}\], the \[O-O\] bond order increases |
| C. | In \[O_{2}^{+}\], paramagnetism decreases |
| D. | \[N_{2}^{+}\] becomes diamagnetic |
| Answer» E. | |
| 843. |
In an octahedral structure, the pair of d orbitals involved in\[~{{d}^{2}}s{{p}^{3}}\] hybridization is |
| A. | \[{{d}_{{{x}^{2}}-{{y}^{2}}}},{{d}_{{{z}^{2}}}}\] |
| B. | \[{{d}_{xz}},{{d}_{{{x}^{2}}-{{y}^{2}}}}\] |
| C. | \[{{d}_{{{z}^{2}}.}}{{d}_{xz}}\] |
| D. | \[{{d}_{xy}},{{d}_{yz}}\] |
| Answer» B. \[{{d}_{xz}},{{d}_{{{x}^{2}}-{{y}^{2}}}}\] | |
| 844. |
In the reaction \[2PC{{l}_{5}}\rightleftharpoons PCl_{_{4}}^{-}+PCl_{6}^{-}\], the change in hybridization is from |
| A. | \[s{{p}^{3}}d\] to \[s{{p}^{3}}\]and \[s{{p}^{3}}{{d}^{2}}\] |
| B. | \[s{{p}^{3}}d\] to\[~s{{p}^{2}}\] and \[s{{p}^{3}}\] |
| C. | \[s{{p}^{3}}d\] to \[s{{p}^{3}}{{d}^{2}}\] and \[s{{p}^{3}}{{d}^{3}}\] |
| D. | \[s{{p}^{3}}{{d}^{2}}\]to \[s{{p}^{3}}\] and \[s{{p}^{3}}d\] |
| Answer» B. \[s{{p}^{3}}d\] to\[~s{{p}^{2}}\] and \[s{{p}^{3}}\] | |
| 845. |
Among the following ions the \[~p\pi -d\pi \] overlap could be present in |
| A. | \[NO_{2}^{-}\] |
| B. | \[NO_{3}^{-}\] |
| C. | \[PO_{4}^{3-}\] |
| D. | \[CO_{3}^{2-}\] |
| Answer» D. \[CO_{3}^{2-}\] | |
| 846. |
The number and type of bonds in ion in\[~Ca{{C}_{2}}\]are: |
| A. | One \[\sigma \,\,bond\]and one \[\pi -bond\] |
| B. | One \[\sigma \,\,bond\] and two \[\pi -bond\] |
| C. | Two \[\sigma \,\,bond\] and two \[\pi -bond\] |
| D. | Two \[\sigma \,\,bond\] and one \[\pi -bond\] |
| Answer» C. Two \[\sigma \,\,bond\] and two \[\pi -bond\] | |
| 847. |
Although\[~C{{N}^{-}}\] ion and \[{{N}_{2}}\] molecule are isoelectronic, yet\[{{N}_{2}}\] molecule is chemically inert because of |
| A. | presence of more number of electrons in bonding orbitals |
| B. | lone bond energy |
| C. | absence of bond polarity |
| D. | uneven electron distribution. |
| Answer» D. uneven electron distribution. | |
| 848. |
Main axis of a diatomic molecule is Z. \[A{O}'s\] \[{{p}_{x}}\]and \[{{p}_{y}}\] overlap to form which of the following orbitals? |
| A. | \[\pi -MO\] |
| B. | \[\sigma -MO\] |
| C. | \[\delta -MO\] |
| D. | No bond will form |
| Answer» E. | |
| 849. |
The molecules \[B{{F}_{3}}\] and \[N{{F}_{3}}\] are both covalent compounds, but \[B{{F}_{3}}\] is non polar whereas \[N{{F}_{3}}\] is polar. The reason for this is |
| A. | atomic size of boron is larger than nitrogen |
| B. | Boron is metal while nitrogen is gas |
| C. | \[B-F\] bonds are non-polar while \[N-F\] bonds are polar |
| D. | \[B{{F}_{3}}\] is planar but \[N{{F}_{3}}\] is pyramidal |
| Answer» E. | |
| 850. |
Which of the correct increasing order of lone pair of electrons on the central atom? |
| A. | \[I{{F}_{7}}<I{{F}_{5}}<Cl{{F}_{3}}<Xe{{F}_{2}}\] |
| B. | \[I{{F}_{7}}<Xe{{F}_{2}}<Cl{{F}_{2}}<I{{F}_{5}}\] |
| C. | \[I{{F}_{7}}<Cl{{F}_{3}}<Xe{{F}_{2}}<I{{F}_{5}}\] |
| D. | \[I{{F}_{7}}<Xe{{F}_{2}}<I{{F}_{5}}<Cl{{F}_{3}}\] |
| Answer» B. \[I{{F}_{7}}<Xe{{F}_{2}}<Cl{{F}_{2}}<I{{F}_{5}}\] | |