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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.
| 11051. |
Which compound contains both ionic and covalent bonds? |
| A. | Sodium nitrate |
| B. | Ammonia |
| C. | Methane |
| D. | Potassium chloride |
| Answer» B. Ammonia | |
| 11052. |
In which of the following ionization processes the bond energy has increased and also the magnetic behaviour has changed from paramagnetic to diamagnetic? |
| A. | \[NO\to N{{O}^{+}}\] |
| B. | \[{{N}_{2}}\to N_{2}^{+}\] |
| C. | \[{{C}_{2}}\to {{C}_{2}}^{+}\] |
| D. | \[{{O}_{2}}\to {{O}_{2}}^{+}\] |
| Answer» B. \[{{N}_{2}}\to N_{2}^{+}\] | |
| 11053. |
Which of the following molecules has two sigma \[(\sigma )\] and two pi\[(\pi )\] bonds? |
| A. | \[{{C}_{2}}{{H}_{4}}\] |
| B. | \[{{N}_{2}}{{F}_{2}}\] |
| C. | \[{{C}_{2}}{{H}_{2}}C{{l}_{2}}\] |
| D. | \[HCN\] |
| Answer» E. | |
| 11054. |
The formation of molecular complex \[B{{F}_{3}}-N{{H}_{3}}\] results in a change in hybridization of boron |
| A. | from \[s{{p}^{2}}\]to \[ds{{p}^{2}}\] |
| B. | from \[s{{p}^{2}}\]to \[s{{p}^{3}}\] |
| C. | from \[s{{p}^{3}}\] to \[s{{p}^{2}}\] |
| D. | from \[s{{p}^{3}}\] to \[s{{p}^{3}}d\] |
| Answer» C. from \[s{{p}^{3}}\] to \[s{{p}^{2}}\] | |
| 11055. |
The group having triangular planar structures is: |
| A. | \[B{{F}_{3}},N{{F}_{3}},CO{{_{3}^{2}}^{-}}\] |
| B. | \[CO_{3}^{2-}\text{, }NO_{3}^{-},\,\,S{{O}_{3}}\] |
| C. | \[N{{H}_{3}},S{{O}_{3}},CO{{_{3}^{2}}^{-}}\] |
| D. | \[NC{{l}_{3}},BC{{l}_{3}},S{{O}_{3}}\] |
| Answer» C. \[N{{H}_{3}},S{{O}_{3}},CO{{_{3}^{2}}^{-}}\] | |
| 11056. |
In \[Br{{F}_{3}}\] molecule, the lone pairs occupy equatorial positions to minimize |
| A. | lone pair - bond pair repulsion only |
| B. | bond pair - bond pair repulsion only |
| C. | lone pair - lone pair repulsion and lone pair bond pair repulsion |
| D. | lone pair - lone pair repulsion only |
| Answer» D. lone pair - lone pair repulsion only | |
| 11057. |
Among the following compounds the one that is polar and has the central atom with \[~s{{p}^{2}}\] hybridization is |
| A. | \[{{H}_{2}}C{{O}_{3}}\] |
| B. | \[Si{{F}_{4}}\] |
| C. | \[B{{F}_{3}}\] |
| D. | \[HCl{{O}_{2}}\] |
| Answer» B. \[Si{{F}_{4}}\] | |
| 11058. |
Which one of the following molecules is polar? |
| A. | \[Xe{{F}_{4}}\] |
| B. | \[I{{F}_{5}}\] |
| C. | \[Sb{{F}_{5}}\] |
| D. | \[C{{F}_{4}}\] |
| Answer» C. \[Sb{{F}_{5}}\] | |
| 11059. |
In a regular octahedral molecule,\[M{{X}_{6}}\] the number of \[X-M-X\] bonds at \[180{}^\circ \] is |
| A. | three |
| B. | two |
| C. | six |
| D. | four |
| Answer» B. two | |
| 11060. |
Among the following, the species having the smallest bond is |
| A. | \[N{{O}^{-}}\] |
| B. | \[N{{O}^{+}}\] |
| C. | \[O{{ }_{2}}\] |
| D. | \[NO\] |
| Answer» C. \[O{{ }_{2}}\] | |
| 11061. |
Point out incorrect statement about resonance [MP PET 1997] |
| A. | Resonance structures should have equal energy |
| B. | In resonance structures, the constituent atoms should be in the same position |
| C. | In resonance structures, there should not be the same number of electron pairs |
| D. | Resonance structures should differ only in the location of electrons around the constituent atoms |
| Answer» D. Resonance structures should differ only in the location of electrons around the constituent atoms | |
| 11062. |
Resonance is due to [NCERT 1981; Kurukshetra CEE 1998] |
| A. | Delocalization of sigma electrons |
| B. | Delocalization of pi electrons |
| C. | Migration of H atoms |
| D. | Migration of protons |
| Answer» C. Migration of H atoms | |
| 11063. |
Pauling?s electronegativity values for elements are useful in predicting [UPSEAT 2004] |
| A. | Polarity of bonds in molecules |
| B. | Position of elements in electrochemical series |
| C. | Co-ordination number |
| D. | Dipole moment of various molecules |
| Answer» B. Position of elements in electrochemical series | |
| 11064. |
Which of the following possesses highest melting point [CPMT 1999] |
| A. | Chlorobenzene |
| B. | o-dichlorobenzene |
| C. | m-dichlorobenzene |
| D. | p-dichlorobenzene |
| Answer» E. | |
| 11065. |
In the series ethane, ethylene and acetylene, the \[C-H\] bond energy is [NCERT 1977] |
| A. | The same in all the three compounds |
| B. | Greatest in ethane |
| C. | Greatest in ethylene |
| D. | Greatest in acetylene |
| Answer» E. | |
| 11066. |
The number and type of bonds between two carbon atoms in calcium carbide are [AIEEE 2005] |
| A. | One sigma, one pi |
| B. | One sigma, two pi |
| C. | Two sigma, one pi |
| D. | Two singma, two pi |
| Answer» C. Two sigma, one pi | |
| 11067. |
The \[p-p\] orbital overlapping is present in the following molecule [MP PET 1994] |
| A. | Hydrogen |
| B. | Hydrogen bromide |
| C. | Hydrogen chloride |
| D. | Chlorine |
| Answer» E. | |
| 11068. |
In a sigma bond |
| A. | Sidewise as well as end to end overlap of orbitals take place |
| B. | Sidewise overlap of orbitals takes place |
| C. | End to end overlap of orbitals takes place |
| D. | None of the above |
| Answer» D. None of the above | |
| 11069. |
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. \[C{{O}_{2}}>CO>CO_{3}^{2-}\] | |
| 11070. |
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. \[O_{2}^{-}\] | |
| 11071. |
Bond energies in \[NO,\,N{{O}^{+}}\] and \[N{{O}^{-}}\] are such as [Pb. CET 2004] |
| A. | \[N{{O}^{-}}>NO>N{{O}^{+}}\] |
| B. | \[NO>N{{O}^{-}}>N{{O}^{+}}\] |
| C. | \[N{{O}^{+}}>NO>N{{O}^{-}}\] |
| D. | \[N{{O}^{+}}>N{{O}^{-}}>NO\] |
| Answer» D. \[N{{O}^{+}}>N{{O}^{-}}>NO\] | |
| 11072. |
Molecular orbital theory was developed mainly by [BHU 1987; Pb. CET 2003] |
| A. | Pauling |
| B. | Pauling and Slater |
| C. | Mulliken |
| D. | Thomson |
| Answer» D. Thomson | |
| 11073. |
The bond order in \[CO_{3}^{2-}\]ion between \[C-O\] is [Pb. PMT 2004] |
| A. | Zero |
| B. | 0.88 |
| C. | 1.33 |
| D. | 2 |
| Answer» D. 2 | |
| 11074. |
How many bonding electron pairs are there in white phosphorous [MP PET 2003] |
| A. | 6 |
| B. | 12 |
| C. | 4 |
| D. | 8 |
| Answer» B. 12 | |
| 11075. |
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. \[{{N}_{2}}\], \[O_{2}^{-}\] | |
| 11076. |
Which of the following is not paramagnetic [AIIMS 1997] |
| A. | \[{{S}^{-2}}\] |
| B. | \[{{N}_{2}}^{-}\] |
| C. | \[O_{2}^{-}\] |
| D. | \[NO\] |
| Answer» B. \[{{N}_{2}}^{-}\] | |
| 11077. |
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. \[{{\sigma }^{*}}\,2{{p}_{x}}\] | |
| 11078. |
Of the following statements which one is correct |
| A. | Oxygen and nitric oxide molecules are both paramagnetic because both contain unpaired electrons |
| B. | Oxygen and nitric oxide molecules are both diamagnetic because both contain no unpaired electrons |
| C. | Oxygen is paramagnetic because it contains unpaired electrons, while nitric oxide is diamagnetic because it contains no unpaired electrons |
| D. | Oxygen is diamagnetic because it contains no unpaired electrons, while nitric oxide is paramagnetic because it contains an unpaired electron |
| Answer» C. Oxygen is paramagnetic because it contains unpaired electrons, while nitric oxide is diamagnetic because it contains no unpaired electrons | |
| 11079. |
The bond order of \[NO\] molecule is [MP PET 1996] |
| A. | 1 |
| B. | 2 |
| C. | 2.5 |
| D. | 3 |
| Answer» D. 3 | |
| 11080. |
Out of the following which has highest dipole moment? |
| A. | 2,2-dimethyl propane |
| B. | trans-2-pentene |
| C. | cis-3-hexene |
| D. | 2,2,3,3-tetramethyl butane |
| Answer» D. 2,2,3,3-tetramethyl butane | |
| 11081. |
Specify the coordination geometry around and hybridization Of N and B atoms in a 1 : 1 complex of \[B{{F}_{3}}\] and \[N{{H}_{3}}\]: |
| A. | N: tetrahedral, \[s{{p}^{3}}\], B: tetrahedral, \[s{{p}^{3}}\] |
| B. | N: pyramidal, \[s{{p}^{3}}\]', B: pyramidal, \[s{{p}^{3}}\] |
| C. | N: pyramidal, \[s{{p}^{3}}\], B: planar, \[s{{p}^{2}}\] |
| D. | N: pyramidal, \[s{{p}^{3}}\], B: tetrahedral, \[s{{p}^{3}}\] |
| Answer» B. N: pyramidal, \[s{{p}^{3}}\]', B: pyramidal, \[s{{p}^{3}}\] | |
| 11082. |
What makes a lemon sour [CPMT 1972; CBSE PMT 1991; RPET 1999] |
| A. | Tartaric acid |
| B. | Oxalic acid |
| C. | Citric acid |
| D. | Hydrochloric acid |
| Answer» D. Hydrochloric acid | |
| 11083. |
In the esterification reaction of alcohols [KCET 1984] |
| A. | \[O{{H}^{-}}\] is replaced by \[{{C}_{6}}{{H}_{5}}OH\] |
| B. | \[{{H}^{+}}\] is replaced by sodium metal |
| C. | \[O{{H}^{-}}\] is replaced by chlorine |
| D. | \[O{{H}^{-}}\] is replaced by \[C{{H}_{3}}CO{{O}^{-}}\] group |
| Answer» E. | |
| 11084. |
Reaction between an acid and alcohol will give [Roorkee 1995] |
| A. | Higher C containing acid |
| B. | Secondary alcohol |
| C. | Alkane |
| D. | Ester |
| Answer» E. | |
| 11085. |
Which one of the following compounds forms a red coloured solution on treatment with neutral \[FeC{{l}_{3}}\]solution [EAMCET 2003] |
| A. | \[C{{H}_{3}}COC{{H}_{3}}\] |
| B. | \[C{{H}_{3}}OC{{H}_{3}}\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}OH\] |
| D. | \[C{{H}_{3}}COOH\] |
| Answer» E. | |
| 11086. |
The fatty acid which shows reducing property is [Kerala CET 2000] |
| A. | Acetic acid |
| B. | Ethanoic Acid |
| C. | Oxalic acid |
| D. | Formic acid |
| Answer» E. | |
| 11087. |
Urea on slow heating gives |
| A. | \[N{{H}_{2}}CON.HN{{O}_{2}}\] |
| B. | \[N{{H}_{2}}CONHCON{{H}_{2}}\] |
| C. | HCNO |
| D. | \[N{{H}_{2}}CON{{H}_{2}}.HN{{O}_{3}}\] |
| Answer» C. HCNO | |
| 11088. |
Which of the following substances when boiled with caustic soda solution will evolve ammonia [BHU 1983] |
| A. | Ethylamine |
| B. | Aniline |
| C. | Acetamide |
| D. | Acetoxime |
| Answer» D. Acetoxime | |
| 11089. |
What is the main reason for the fact that carboxylic acids can undergo ionization [MNR 1993; Pb. PMT 2004] |
| A. | Absence of \[\alpha -\]hydrogen |
| B. | Resonance stabilisation of the carboxylate ion |
| C. | High reactivity of \[\alpha -\]hydrogen |
| D. | Hydrogen bonding |
| Answer» C. High reactivity of \[\alpha -\]hydrogen | |
| 11090. |
Formic acid [MP PET/PMT 1988] |
| A. | Is immiscible with water |
| B. | Reduces the ammonical silver nitrate |
| C. | Is a weak acid nearly three and a half time weaker than acetic acid |
| D. | Is prepared by heating potassium hydroxide |
| Answer» C. Is a weak acid nearly three and a half time weaker than acetic acid | |
| 11091. |
The reaction \[2C{{H}_{3}}-\underset{\underset{O}{\mathop{||}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C-O{{C}_{2}}{{H}_{5}}\xrightarrow{{{C}_{2}}{{H}_{5}}ONa}}}\,\]\[C{{H}_{3}}-\underset{\underset{O}{\mathop{||}}\,}{\mathop{C}}\,-C{{H}_{2}}-\underset{\underset{O}{\mathop{||}}\,}{\mathop{C}}\,-O{{C}_{2}}{{H}_{5}}+{{C}_{2}}{{H}_{5}}OH\] is called [MP PMT 2003; KCET 1996] |
| A. | Etard reaction |
| B. | Perkin's reaction |
| C. | Claisen condensation |
| D. | Claisen Schmidt reaction |
| Answer» D. Claisen Schmidt reaction | |
| 11092. |
Acetic acid exists as a dimer in benzene solution. This is due to [MP PMT 1989; CPMT 1982] |
| A. | Condensation |
| B. | Presence of \[-COOH\] group |
| C. | Presence of \[\alpha -\]hydrogen |
| D. | Hydrogen bonding |
| Answer» E. | |
| 11093. |
Oxalic acid may be distinguished from tartaric acid by |
| A. | Sodium bicarbonate solution |
| B. | Ammonical silver nitrate solution |
| C. | Litmus paper |
| D. | Phenolphthalein |
| Answer» C. Litmus paper | |
| 11094. |
Acetic anhydride reacts with excess of ammonia to form [MP PET 1992] |
| A. | \[2C{{H}_{3}}COON{{H}_{4}}\] |
| B. | \[2C{{H}_{3}}CON{{H}_{2}}\] |
| C. | \[C{{H}_{3}}CON{{H}_{2}}+C{{H}_{3}}COON{{H}_{4}}\] |
| D. | \[2C{{H}_{3}}COOH\] |
| Answer» D. \[2C{{H}_{3}}COOH\] | |
| 11095. |
If the enolate ion combines with carbonyl group of ester, we get [DPMT 2005] |
| A. | Aldol |
| B. | \[\alpha ,\,\beta \]-unsaturated ester |
| C. | \[\beta \]-keto aldehyde |
| D. | Acid |
| Answer» D. Acid | |
| 11096. |
Which of the following is an amphoteric acid [KCET 2005] |
| A. | Glycine |
| B. | Salicylic acid |
| C. | Benzoic acid |
| D. | Citric acid |
| Answer» B. Salicylic acid | |
| 11097. |
\[{{C}_{6}}{{H}_{5}}CONHC{{H}_{3}}\] can be converted into \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}NHC{{H}_{3}}\] by [AIIMS 2005] |
| A. | \[NaB{{H}_{4}}\] |
| B. | \[{{H}_{2}}-Pd/C\] |
| C. | \[LiAl{{H}_{4}}\] |
| D. | \[Zn-Hg/HCl\] |
| Answer» E. | |
| 11098. |
When \[C{{H}_{3}}COOH\] reacts with \[C{{H}_{3}}-Mg-X\] [BVP 2003] |
| A. | \[C{{H}_{3}}COX\]is formed |
| B. | Hydrocarbon is formed |
| C. | Acetone is formed |
| D. | Alcohol is formed |
| Answer» C. Acetone is formed | |
| 11099. |
The \[OH\] group of an alcohol or the \[-COOH\] group of a carboxylic acid can be replaced by \[-Cl\]using [CBSE PMT 2004] |
| A. | Chlorine |
| B. | Hydrochloric acid |
| C. | Phosphorus pent chloride |
| D. | Hypochlorous acid |
| Answer» D. Hypochlorous acid | |
| 11100. |
The weakest acid among the following is [CPMT 1976, 82, 89; BHU 1982; CBSE PMT 1991; MP PMT 1989; Roorkee 1992; RPET 1999] |
| A. | \[C{{H}_{3}}COOH\] |
| B. | \[C{{l}_{2}}CHCOOH\] |
| C. | \[ClC{{H}_{2}}COOH\] |
| D. | \[C{{l}_{3}}CCOOH\] |
| Answer» B. \[C{{l}_{2}}CHCOOH\] | |