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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.
| 7401. |
The covalency of nitrogen in \[HN{{O}_{3}}\] is [CPMT 1987] |
| A. | 0 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 7402. |
Which of the following substances has covalent bonding [AMU 1985] |
| A. | Germanium |
| B. | Sodium chloride |
| C. | Solid neon |
| D. | Copper |
| Answer» B. Sodium chloride | |
| 7403. |
The valency of phosphorus in \[{{H}_{3}}P{{O}_{4}}\]is [DPMT 1984] |
| A. | 2 |
| B. | 5 |
| C. | 4 |
| D. | 1 |
| Answer» C. 4 | |
| 7404. |
The bond between two identical non-metal atoms has a pair of electrons [CPMT 1986] |
| A. | Unequally shared between the two |
| B. | Transferred fully from one atom to another |
| C. | With identical spins |
| D. | Equally shared between them |
| Answer» B. Transferred fully from one atom to another | |
| 7405. |
The electronic configuration of four elements are given in brackets \[L\,\left( 1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{1}} \right);\,\,M\,\left( 1{{s}^{2}},\,\,2{{s}^{2}}\,2{{p}^{5}} \right)\] \[Q\,\left( 1{{s}^{2}},\,\,2{{s}^{2}}\,2{{p}^{6}},\,\,3{{s}^{1}} \right);\,\,R\,\left( 1{{s}^{2}},\,\,2{{s}^{2}}\,2{{p}^{2}} \right)\] The element that would most readily form a diatomic molecule is [NCERT 1983] |
| A. | Q |
| B. | M |
| C. | R |
| D. | L |
| Answer» C. R | |
| 7406. |
A covalent bond is likely to be formed between two elements which [MP PMT 1987] |
| A. | Have similar electronegativities |
| B. | Have low ionization energies |
| C. | Have low melting points |
| D. | Form ions with a small charge |
| Answer» B. Have low ionization energies | |
| 7407. |
Solid \[C{{H}_{4}}\] is [DPMT 1983] |
| A. | Molecular solid |
| B. | Ionic solid |
| C. | Pseudo solid |
| D. | Does not exist |
| Answer» B. Ionic solid | |
| 7408. |
Bond energy of covalent \[O-H\]bond in water is [EAMCET 1982] |
| A. | Greater than bond energy of \[H-\]bond |
| B. | Equal to bond energy of \[H-\]bond |
| C. | Less than bond energy of \[H-\]bond |
| D. | None of these |
| Answer» B. Equal to bond energy of \[H-\]bond | |
| 7409. |
The correct sequence of increasing covalent character is represented by [CBSE PMT 2005] |
| A. | \[LiCl<NaCl<BeC{{l}_{2}}\] |
| B. | \[BeC{{l}_{2}}<NaCl<LiCl\] |
| C. | \[NaCl<LiCl<BeC{{l}_{2}}\] |
| D. | \[BeC{{l}_{2}}<LiCl<NaCl\] |
| Answer» D. \[BeC{{l}_{2}}<LiCl<NaCl\] | |
| 7410. |
The covalent compound \[HCl\] has the ionic character as [EAMCET 1980] |
| A. | The electronegativity of hydrogen is greater than that of chlorine |
| B. | The electronegativity of hydrogen is equal to that of chlorine |
| C. | The electronegativity of chlorine is greater than that of hydrogen |
| D. | Hydrogen and chlorine are gases |
| Answer» D. Hydrogen and chlorine are gases | |
| 7411. |
Which is the most covalent [AFMC 1982] |
| A. | \[C-O\] |
| B. | \[C-Br\] |
| C. | \[C-S\] |
| D. | \[C-F\] |
| Answer» D. \[C-F\] | |
| 7412. |
If the atomic number of element \[X\] is 7, the best electron dot symbol for the element is [NCERT 1973; CPMT 2003] |
| A. | \[X\,\,.\] |
| B. | \[.\,\,X\,\,.\] |
| C. | \[.\,\,\underset{.}{\overset{.}{\mathop{X}}}\,\,\,:\] |
| D. | \[:\,\,\underset{.\,.}{\overset{.\,.}{\mathop{X}}}\,\,\,.\] |
| Answer» D. \[:\,\,\underset{.\,.}{\overset{.\,.}{\mathop{X}}}\,\,\,.\] | |
| 7413. |
Indicate the nature of bonding in \[CC{{l}_{4}}\] and \[2s\] [NCERT 1973] |
| A. | Covalent in \[CC{{l}_{4}}\] and electrovalent in \[Ca{{H}_{2}}\] |
| B. | Electrovalent in both \[CC{{l}_{4}}\] and \[Ca{{H}_{2}}\] |
| C. | Covalent in both \[CC{{l}_{4}}\]and \[Ca{{H}_{2}}\] |
| D. | Electrovalent in \[CC{{l}_{4}}\] and covalent in \[Ca{{H}_{2}}\] |
| Answer» B. Electrovalent in both \[CC{{l}_{4}}\] and \[Ca{{H}_{2}}\] | |
| 7414. |
Which of the following compounds are covalent [IIT 1980; MLNR 1982] |
| A. | \[{{H}_{2}}\] |
| B. | \[CaO\] |
| C. | \[KCl\] |
| D. | \[N{{a}_{2}}S\] |
| Answer» B. \[CaO\] | |
| 7415. |
Octet rule is not valid for the molecule [IIT 1979; MP PMT 1995] |
| A. | \[C{{O}_{2}}\] |
| B. | \[{{H}_{2}}O\] |
| C. | \[CO\] |
| D. | \[{{O}_{2}}\] |
| Answer» C. \[CO\] | |
| 7416. |
The number of electrons involved in the bond formation of \[{{N}_{2}}\]molecule [IIT 1980; CPMT 1983, 84, 85; CBSE PMT 1992] |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 10 |
| Answer» D. 10 | |
| 7417. |
Indicate the nature of bonding in diamond [EAMCET 1980; BHU 1996; KCET 2000] |
| A. | Covalent |
| B. | Ionic |
| C. | Coordinate |
| D. | Hydrogen |
| Answer» B. Ionic | |
| 7418. |
Amongst the following covalent bonding is found in [CPMT 1973] |
| A. | Sodium chloride |
| B. | Magnesium chloride |
| C. | Water |
| D. | Brass |
| Answer» D. Brass | |
| 7419. |
A bond with maximum covalent character between non-metallic elements is formed [NCERT 1982] |
| A. | Between identical atoms |
| B. | Between chemically similar atoms |
| C. | Between atoms of widely different electronegativities |
| D. | Between atoms of the same size |
| Answer» B. Between chemically similar atoms | |
| 7420. |
Which of the following occurs when two hydrogen atoms bond with each others |
| A. | Potential energy is lowered |
| B. | Kinetic energy is lowered |
| C. | Electronic motion ceases |
| D. | Energy is absorbed |
| Answer» B. Kinetic energy is lowered | |
| 7421. |
Silicon has 4 electrons in the outermost orbit. In forming the bonds [EAMCET 1981] |
| A. | It gains electrons |
| B. | It loses electrons |
| C. | It shares electrons |
| D. | None of these |
| Answer» D. None of these | |
| 7422. |
Which among the following elements has the tendency to form covalent compounds |
| A. | \[Ba\] |
| B. | \[Be\] |
| C. | \[Mg\] |
| D. | \[Ca\] |
| Answer» C. \[Mg\] | |
| 7423. |
Which one is the electron deficient compound [AIIMS 1982] |
| A. | \[ICl\] |
| B. | \[N{{H}_{3}}\] |
| C. | \[BC{{l}_{3}}\] |
| D. | \[PC{{l}_{3}}\] |
| Answer» D. \[PC{{l}_{3}}\] | |
| 7424. |
Covalent compounds are generally ...... in water [CPMT 1987] |
| A. | Soluble |
| B. | Insoluble |
| C. | Dissociated |
| D. | Hydrolysed |
| Answer» C. Dissociated | |
| 7425. |
Which type of bond is formed between similar atoms |
| A. | Ionic |
| B. | Covalent |
| C. | Coordinate |
| D. | Metallic |
| Answer» C. Coordinate | |
| 7426. |
For the formation of covalent bond, the difference in the value of electronegativities should be [EAMCET 1982] |
| A. | Equal to or less than 1.7 |
| B. | More than 1.7 |
| C. | 1.7 or more |
| D. | None of these |
| Answer» B. More than 1.7 | |
| 7427. |
The valency of sulphur in sulphuric acid is [NCERT 1974] |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 7428. |
Corrosion of iron is essentially an electrochemical phenomenon where the cell reactions are [KCET 2005] |
| A. | \[Fe\] is oxidised to \[F{{e}^{2+}}\] and dissolved oxygen in water is reduced to \[\overset{\,\,\,\,\,\,\,}{\mathop{OH}}\,\] |
| B. | \[Fe\] is oxidised to \[F{{e}^{3+}}\] and \[{{H}_{2}}O\] is reduced to \[O_{2}^{2-}\] |
| C. | \[Fe\] is oxidised to \[F{{e}^{2+}}\] and \[{{H}_{2}}O\] is reduced to \[O_{2}^{-}\] |
| D. | \[Fe\] is oxidised to \[F{{e}^{2+}}\] and \[{{H}_{2}}O\] is reduced to \[{{O}_{2}}\] |
| Answer» B. \[Fe\] is oxidised to \[F{{e}^{3+}}\] and \[{{H}_{2}}O\] is reduced to \[O_{2}^{2-}\] | |
| 7429. |
Rusting of iron is catalysed by which of the following [MNR 1990; UPSEAT 2001] |
| A. | \[Fe\] |
| B. | \[{{O}_{2}}\] |
| C. | \[Zn\] |
| D. | \[{{H}^{+}}\] |
| Answer» E. | |
| 7430. |
Corrosion is basically a [Kerala (Med.) 2002] |
| A. | Altered reaction in presence of \[{{H}_{2}}O\] |
| B. | Electrochemical phenomenon |
| C. | Interaction |
| D. | Union between light metal and heavy metal |
| Answer» C. Interaction | |
| 7431. |
Percentage of carbon in steel is |
| A. | 2.5 - 4.5% |
| B. | 0.25 - 0.5% |
| C. | 0.2 - 1.5% |
| D. | 3 - 3.5% |
| Answer» D. 3 - 3.5% | |
| 7432. |
\[Pb{{O}_{2}}\] is [JIPMER 2000] |
| A. | Basic |
| B. | Acidic |
| C. | Neutral |
| D. | Amphoteric |
| Answer» E. | |
| 7433. |
Adsorption is phenomenon is which a substance |
| A. | Goes into the body of the other substance |
| B. | Remains close the other substance |
| C. | Accumulates on the surface of the other substance |
| D. | None of these |
| Answer» D. None of these | |
| 7434. |
Natural rubber is which type of polymer [DCE 2002] |
| A. | Condensation polymer |
| B. | Addition polymer |
| C. | Co-ordination polymer |
| D. | None of these |
| Answer» C. Co-ordination polymer | |
| 7435. |
Which is strongest Lewis base [CPMT 1994] |
| A. | \[Sb{{H}_{3}}\] |
| B. | \[As{{H}_{3}}\] |
| C. | \[P{{H}_{3}}\] |
| D. | \[N{{H}_{3}}\] |
| Answer» E. | |
| 7436. |
An ore like zinc blende is concentrated by [MP PMT 1997] |
| A. | Froth floatation |
| B. | Magnetic separation |
| C. | Leaching |
| D. | Washing with water |
| Answer» B. Magnetic separation | |
| 7437. |
Butene-1 may be converted to butane by reaction with [AIEEE 2003] |
| A. | Zn-HCl |
| B. | Sn-HCl |
| C. | Zn-Hg |
| D. | Pd/\[{{H}_{2}}\] |
| Answer» E. | |
| 7438. |
Heat produced in calories by the combustion of one gram of carbon is called |
| A. | Heat of combustion of carbon |
| B. | Heat of formation of carbon |
| C. | Calorific value of carbon |
| D. | Heat of production of carbon |
| Answer» D. Heat of production of carbon | |
| 7439. |
An organic dye, cosine used to detect end point of precipitation titration by adsorption is called [MH CET 1999] |
| A. | Absorption indicator |
| B. | Adsorption indicator |
| C. | Chemical indicator |
| D. | None of these |
| Answer» C. Chemical indicator | |
| 7440. |
In the dichlorination reaction of propane, mixture of products are obtained. How many isomers, the mixture contains [Orissa JEE 2003] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 7441. |
\[AgN{{O}_{3}}\] gives a red ppt. with [NCERT 1972; BHU 1978; MP PMT 1995] |
| A. | \[KI\] |
| B. | \[NaBr\] |
| C. | \[NaN{{O}_{3}}\] |
| D. | \[{{K}_{2}}Cr{{O}_{4}}\] |
| Answer» E. | |
| 7442. |
A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the \[\alpha -\]particles in succession. The group of the periodic table to which the resulting daughter element would belong is [CBSE PMT 2005] |
| A. | Gr.14 |
| B. | Gr.16 |
| C. | Gr.4 |
| D. | Gr.6 |
| Answer» C. Gr.4 | |
| 7443. |
The entropy change, in the conversion of one mole of liquid water at 373 K to vapour at the same temperature is (Latent heat of vaporization of water, \[\Delta {{H}_{vap}}=2.257\,kJ/g)\] [AFMC 2002; KCET 2002] |
| A. | 105.9\[J{{k}^{-1}}\] |
| B. | \[107.9\,\,J{{k}^{-1}}\] |
| C. | \[108.9\,\,J{{k}^{-1}}\] |
| D. | \[109.9\,\,J{{k}^{-1}}\] |
| Answer» D. \[109.9\,\,J{{k}^{-1}}\] | |
| 7444. |
Silver nitrate is supplied in coloured bottles because it is [CPMT 1985] |
| A. | Oxidised in air |
| B. | Decomposes in sunlight |
| C. | Explosive in sunlight |
| D. | Reactive towards air in sunlight |
| Answer» C. Explosive in sunlight | |
| 7445. |
Which of the following is used as a moderator in a nuclear reactor [AIIMS 2001] |
| A. | \[{{D}_{2}}O\] |
| B. | \[{{N}_{2}}O\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[NaOH\] |
| Answer» B. \[{{N}_{2}}O\] | |
| 7446. |
Formation of silver mirror by glucose shows that it is a/an |
| A. | Oxidising agent |
| B. | Acid |
| C. | Reducing agent |
| D. | A salt of silver |
| Answer» D. A salt of silver | |
| 7447. |
Aromatisation of n-heptane by passing over \[(A{{l}_{2}}{{O}_{3}}+C{{r}_{2}}{{O}_{3}})\] catalyst at 773 K gives [DCE 2004] |
| A. | Benzene |
| B. | Toluene |
| C. | Mixture of both |
| D. | Heptylene |
| Answer» C. Mixture of both | |
| 7448. |
Cyclohexane, a hydrocarbon floats on water because [NCERT 1976] |
| A. | It is immiscible with water |
| B. | Its density is low as compared to water |
| C. | It is non-polar substance |
| D. | It is immiscible and lighter than water |
| Answer» E. | |
| 7449. |
Which of the following reactions will not give propane [DPMT 2005] |
| A. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Cl\underset{{{H}_{2}}O}{\mathop{\xrightarrow{Mg/\text{ether}}}}\,\] |
| B. | \[C{{H}_{3}}COCl\underset{{{H}_{2}}O}{\mathop{\xrightarrow{C{{H}_{3}}MgX}}}\,\] |
| C. | \[C{{H}_{3}}CH=C{{H}_{2}}\underset{C{{H}_{3}}COOH}{\mathop{\xrightarrow{{{B}_{2}}{{H}_{6}}}}}\,\] |
| D. | \[\underset{OH\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}CH-C{{H}_{3}}}}\,}}\,\xrightarrow{P/HI}\] |
| Answer» C. \[C{{H}_{3}}CH=C{{H}_{2}}\underset{C{{H}_{3}}COOH}{\mathop{\xrightarrow{{{B}_{2}}{{H}_{6}}}}}\,\] | |
| 7450. |
Among the following acids, the weakest one is [NCERT 1984] |
| A. | \[HF\] |
| B. | \[HCl\] |
| C. | \[HBr\] |
| D. | \[HI\] |
| Answer» B. \[HCl\] | |