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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.
| 9901. |
The metal commonly present in brass and german silver is [EAMCET 1988] |
| A. | Mg |
| B. | Zn |
| C. | C |
| D. | Al |
| Answer» C. C | |
| 9902. |
When a radioactive element emits an electron the daughter element formed will have [EAMCET 1988; MP PET 1994] |
| A. | Mass number one unit less |
| B. | Atomic number one unit less |
| C. | Mass number one unit more |
| D. | Atomic number one unit more |
| Answer» E. | |
| 9903. |
The number of gram atoms of oxygen present in 0.3 gram mole of \[{{(COOH)}_{2}}.2{{H}_{2}}O\]is |
| A. | 0.6 |
| B. | 1.8 |
| C. | 1.2 |
| D. | 3.6 |
| Answer» C. 1.2 | |
| 9904. |
The alkene which on ozonolysis yields acetone is [MP PMT 1986, 2000] |
| A. | \[C{{H}_{2}}=C{{H}_{2}}\] |
| B. | \[C{{H}_{3}}-CH=C{{H}_{2}}\] |
| C. | \[{{(C{{H}_{3}})}_{2}}C=C{{(C{{H}_{3}})}_{2}}\] |
| D. | \[C{{H}_{3}}-CH=CH-C{{H}_{3}}\] |
| Answer» D. \[C{{H}_{3}}-CH=CH-C{{H}_{3}}\] | |
| 9905. |
Gold number is maximum for the lyophilic sol is [BVP 2004] |
| A. | Gelatin |
| B. | Haemoglobin |
| C. | Sodium oleate |
| D. | Potato starch |
| Answer» E. | |
| 9906. |
Amongst the following, the compound that is nitrated with difficulty is |
| A. | Benzene |
| B. | Nitrobenzene |
| C. | Toluene |
| D. | Phenol |
| Answer» C. Toluene | |
| 9907. |
Addition of HCN to ethyne in presence of \[Ba{{(CN)}_{2}}\] as catalyst gives [AFMC 1991] |
| A. | 1, 1-dicyano ethane |
| B. | Ethyl cyanide |
| C. | Vinyl cyanide |
| D. | Divinyl cyanide |
| Answer» D. Divinyl cyanide | |
| 9908. |
Pure anhydrous \[MgC{{l}_{2}}\] can be prepared from the hydrated salt by [CPMT 1986; MP PMT 1989] |
| A. | Heating the hydrate with coke |
| B. | Heating the hydrate with \[Mg\] ribbon |
| C. | Melting the hydrate |
| D. | Heating the hydrate to red heat in an atmosphere of \[HCl\]gas |
| Answer» E. | |
| 9909. |
The mass average molecular mass & number average molecular mass of a polymer are respectively 40,000 and 30,000. The polydispersity index of polymer will be [Kerala CET 2005] |
| A. | < 1 |
| B. | > 1 |
| C. | 1 |
| D. | 0 |
| E. | -1 |
| Answer» C. 1 | |
| 9910. |
In the fractional distillation of crude petroleum [Roorkee 1989] |
| A. | Petrol condenses at the bottom of the column |
| B. | The gases condense at the top of the column |
| C. | High boiling constituents condense at the bottom of the column |
| D. | High boiling constituents condense at the top of the column |
| Answer» D. High boiling constituents condense at the top of the column | |
| 9911. |
In certain matters lithium differs from other alkali metals, the main reason for this is [MP PET/PMT 1998] |
| A. | Small size of Li atom and \[L{{i}^{+}}\] ion |
| B. | Extremely high electropositivity of \[Li\] |
| C. | Greater hardness of \[Li\] |
| D. | Hydration of \[L{{i}^{+}}\] ion |
| Answer» B. Extremely high electropositivity of \[Li\] | |
| 9912. |
Cryolite helps in [BHU 2003] |
| A. | Lowering the melting point |
| B. | Increasing the melting point |
| C. | Increasing the electrical conductivity |
| D. | Decreasing the electrical conductivity |
| Answer» D. Decreasing the electrical conductivity | |
| 9913. |
In the manufacture of steel, the Bessemer converter is containing lining of |
| A. | \[Si{{O}_{2}}\] |
| B. | \[CaO\] |
| C. | \[CaO\] and \[MgO\] |
| D. | \[F{{e}_{2}}{{O}_{3}}\] |
| Answer» D. \[F{{e}_{2}}{{O}_{3}}\] | |
| 9914. |
Which carbohydrates has highest abundance in human blood [MP PET 1995] |
| A. | d-fructose |
| B. | d-glucose |
| C. | Sucrose |
| D. | Lactose |
| Answer» C. Sucrose | |
| 9915. |
The standard state gibbs free energy change for the given isomerization reaction cis-2-pentene ⇌ trans ?2 -pentene is \[-3.67\,kJ/mol\] at \[400K\]. If more trans-2-pentene is added to the reaction vessel, then [CBSE PMT 1995; BHU 1999; AFMC 2000] |
| A. | More cis ?2?pentene is formed |
| B. | Equilibrium is shifted in the forward direction |
| C. | Equilibrium remains unaffected |
| D. | Additional trans?2?pentene is formed |
| Answer» B. Equilibrium is shifted in the forward direction | |
| 9916. |
A detergent is a [CPMT 1993] |
| A. | Cleaning agent |
| B. | Drug |
| C. | Catalyst |
| D. | Vitamin |
| Answer» B. Drug | |
| 9917. |
Chlorine atom differs from chloride ion in the number of [NCERT 1972; MP PMT 1995] |
| A. | Proton |
| B. | Neutron |
| C. | Electrons |
| D. | Protons and electrons |
| Answer» D. Protons and electrons | |
| 9918. |
Trunbull's blue is a compound [KCET 1993] |
| A. | Ferricyanide |
| B. | Ferrous ferricyanide |
| C. | Ferrous cyanide |
| D. | Ferriferrocyanide |
| Answer» C. Ferrous cyanide | |
| 9919. |
Which of the following has least mass [Pb. PET 1985] |
| A. | \[2\ g\] atom of nitrogen |
| B. | \[3\times {{10}^{23}}\] atoms of \[C\] |
| C. | 1 mole of \[S\] |
| D. | \[7.0\ g\] of \[Ag\] |
| Answer» C. 1 mole of \[S\] | |
| 9920. |
Homolytic fission of C - C bond in ethane gives an intermediate in which carbon is [IIT-JEE 1992] |
| A. | \[s{{p}^{3}}\] hybridised |
| B. | \[s{{p}^{2}}\]hybridized |
| C. | \[sp\] hybridised |
| D. | \[s{{p}^{2}}d\] hybridized |
| Answer» C. \[sp\] hybridised | |
| 9921. |
Which of the following is the sweetest sugar [MP PMT 1997; CBSE PMT 1999; AIIMS 2000 Manipal MEE 1995; CPMT 1996; BHU 1997;] |
| A. | Glucose |
| B. | Fructose |
| C. | Lactose |
| D. | Sucrose |
| Answer» C. Lactose | |
| 9922. |
Chemical name of the insecticide gammexene is [CPMT 1981; MP PET 1995; MP PMT 1996; CBSE PMT 1999; MP PET 1999] |
| A. | DDT |
| B. | Benzene hexachloride |
| C. | Chloral |
| D. | Hexachloroethane |
| Answer» C. Chloral | |
| 9923. |
In which of the following, addition of \[HBr\] does not take place against Markownikoff's rule or Anti-Markownikoff addition of \[HBr\] is not observed for [IIT-JEE 1985; CBSE PMT 1994; MADT Bihar 1995; MP PMT 1999; AMU 2002] |
| A. | Propene |
| B. | But-1-ene |
| C. | But-2-ene |
| D. | Pent-2-ene |
| Answer» D. Pent-2-ene | |
| 9924. |
Yeast cell derive their energy from glucose by [AIIMS 2001] |
| A. | Glycolysis |
| B. | Respiration formation |
| C. | Formation |
| D. | None of these |
| Answer» B. Respiration formation | |
| 9925. |
Which one of the following statements is not correct [CBSE PMT 1994] |
| A. | Zinc dissolves in sodium hydroxide solution |
| B. | Carbon monoxide reduces iron (III) oxide to iron |
| C. | Mercury (II) iodide dissolves in excess of potassium iodide solution |
| D. | Tin (IV) chloride is made by dissolving tin solution in concentrated hydrochloric acid |
| Answer» E. | |
| 9926. |
Which reactions are most common in alkenes [Pb. CET 1989] |
| A. | Electrophilic substitution reactions |
| B. | Nucleophilic substitution reactions |
| C. | Electrophilic addition reactions |
| D. | Nucleophilic addition reactions |
| Answer» D. Nucleophilic addition reactions | |
| 9927. |
Which of the following statement(s) is(are) correct with reference to the ferrous and ferric ions [IIT 1998] |
| A. | \[F{{e}^{3+}}\] gives brown colour with potassium ferricyanide |
| B. | \[F{{e}^{2+}}\]gives blue precipitate with potassium ferricyanide |
| C. | \[F{{e}^{3+}}\] gives red colour with potassium thiocyanate |
| D. | \[F{{e}^{2+}}\] gives brown colour with ammonium thiocyanate |
| Answer» C. \[F{{e}^{3+}}\] gives red colour with potassium thiocyanate | |
| 9928. |
Which one is Freundlich's equation |
| A. | \[\frac{x}{m}=\log \,K+\frac{1}{n}\log \,P\] |
| B. | \[\frac{x}{m}=\exp \,(-KP)\] |
| C. | \[\frac{x}{m}=K{{P}^{2}}\] |
| D. | \[\log \frac{x}{m}=\log K+\frac{1}{n}\log \,C\] |
| Answer» E. | |
| 9929. |
When potassium permanganate is titrated against ferrous ammonium sulphate, the equivalent weight of potassium permanganate is [CPMT 1988] |
| A. | Molecular weight /10 |
| B. | Molecular weight /5 |
| C. | Molecular weight /2 |
| D. | Molecular weight |
| Answer» C. Molecular weight /2 | |
| 9930. |
If a refrigerator's door is opened, then we get [CPMT 1980] |
| A. | Room heated |
| B. | Room cooled |
| C. | More amount of heat is passed out |
| D. | No effect on room |
| Answer» B. Room cooled | |
| 9931. |
Which of the following aqueous solution will have a \[pH\] less than 7.0 [MP PMT 1991, 92] |
| A. | \[KN{{O}_{3}}\] |
| B. | \[NaOH\] |
| C. | \[FeC{{l}_{3}}\] |
| D. | \[1\times {{10}^{-15}}\] |
| Answer» D. \[1\times {{10}^{-15}}\] | |
| 9932. |
Which of the following oil is obtained from benzene after fractional distillation of coal tar [BHU 2004] |
| A. | Light oil |
| B. | Heavy oil |
| C. | Middle oil |
| D. | Anthracene oil |
| Answer» B. Heavy oil | |
| 9933. |
Colloidal solutions of metals like gold, silver and platinum are generally prepared by using [DPMT 1984] |
| A. | Peptization |
| B. | Bredig's arc method |
| C. | Exchange of solvent |
| D. | Oxidation method |
| Answer» C. Exchange of solvent | |
| 9934. |
In polysaccharides the linkage connecting monosaccharide units is called [MP PMT 2000] |
| A. | Glycoside linkage |
| B. | Nucleoside linkage |
| C. | Glycogen linkage |
| D. | Peptide linkage |
| Answer» B. Nucleoside linkage | |
| 9935. |
The enthalpy change for the transition of liquid water to steam, \[\Delta {{H}_{vap}}=37.3\,kJ\,mo{{l}^{-1}}\] at \[373\,K\]. The entropy change for the process is [MP PET 1994] |
| A. | \[111.9\,J\,mo{{l}^{-1}}{{K}^{-1}}\] |
| B. | \[37.3\,J\,mo{{l}^{-1}}\,{{K}^{-1}}\] |
| C. | \[100\,J\,mo{{l}^{-1}}{{K}^{-1}}\] |
| D. | \[74.6\,J\,mo{{l}^{-1}}{{K}^{-1}}\] |
| Answer» D. \[74.6\,J\,mo{{l}^{-1}}{{K}^{-1}}\] | |
| 9936. |
Acetylene is prepared industrially by passing electric discharge through graphite electrodes in the atmosphere of [CPMT 1985] |
| A. | Air |
| B. | \[{{N}_{2}}\] |
| C. | \[{{H}_{2}}\] |
| D. | \[C{{O}_{2}}\] |
| Answer» D. \[C{{O}_{2}}\] | |
| 9937. |
IUPAC name of \[{{(C{{H}_{3}})}_{3}}C-CH=C{{H}_{2}}\] is [NCERT 1978, 81; IIT-JEE 1984; DPMT 1986; CPMT 1989; CBSE PMT 1991; AIIMS 1997; MP PMT 2001; KCET 2003] |
| A. | 3,3,3-trimethyl-1-propene |
| B. | 1,1,1-trimethyl-2-propene |
| C. | 3,3-dimethyl-1-butene |
| D. | 2,2-dimethyl-3-butene |
| Answer» D. 2,2-dimethyl-3-butene | |
| 9938. |
IUPAC name of \[{{H}_{3}}C-\underset{{{C}_{2}}{{H}_{5}}\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{2}}}}\,}}\,-\underset{OH\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{2}}Cl}}\,}}\,\] is [CPMT 1988, 93] |
| A. | 1-chloro-4-methyl -2-hexanal |
| B. | 1-chloro--4-ethyl-2-pentanol |
| C. | 1-chloro-4-methyl-2-hexanol |
| D. | 1-chloro--2-hydroxy-4-methyl hexane |
| Answer» D. 1-chloro--2-hydroxy-4-methyl hexane | |
| 9939. |
The alkane that yields two isomeric monobromo derivatives is [EAMCET 1997] |
| A. | Neopentane |
| B. | Ethane |
| C. | Methane |
| D. | Propane |
| Answer» E. | |
| 9940. |
The degree of dissociation in a weak electrolyte increases [CBSE PMT 1989; MP PMT 1997] |
| A. | On increasing dilution |
| B. | On increasing pressure |
| C. | On decreasing dilution |
| D. | None of these |
| Answer» B. On increasing pressure | |
| 9941. |
Reaction of one molecule of \[HBr\] with one molecule of 1,3-butadiene at \[{{40}^{o}}C\] gives predominantly [AIEEE 2005] |
| A. | 3-bromobutene under kinetically controlled conditions |
| B. | 1-bromo-2-butene under thermodyanamically controlled conditions |
| C. | 3-bromobutene under thermodynamically controlled conditions |
| D. | 1-bromo-2-butene under kinetically controlled conditions |
| Answer» C. 3-bromobutene under thermodynamically controlled conditions | |
| 9942. |
The cell reaction \[Cu+2A{{g}^{+}}\to C{{u}^{+2}}+Ag\] is best represented by [AMU 2000] |
| A. | \[C{{u}_{(s)}}|C{{u}^{+2}}_{(aq)}||A{{g}^{+}}_{(aq)}|A{{g}_{(s)}}\] |
| B. | \[Pt|C{{u}^{+2}}||A{{g}^{+}}_{(aq)}|A{{g}_{(s)}}\] |
| C. | \[C{{u}^{+2}}|Cu||Pt|Ag\] |
| D. | None of the above representations |
| Answer» B. \[Pt|C{{u}^{+2}}||A{{g}^{+}}_{(aq)}|A{{g}_{(s)}}\] | |
| 9943. |
By coaltar distillation, which is not obtained [SCRA 1990; MP PMT 1986] |
| A. | Light oil |
| B. | Middle oil |
| C. | Heavy oil |
| D. | Mobil oil |
| Answer» E. | |
| 9944. |
Accepting the definition that an acid is a proton donor, the acid in the following reaction \[N{{H}_{3}}+{{H}_{2}}O\to NH_{4}^{+}+O{{H}^{-}}\] is [Kerala (Med.) 2003] |
| A. | \[N{{H}_{3}}\] |
| B. | \[{{H}^{+}}\] |
| C. | \[NH_{4}^{+}\] |
| D. | \[{{H}_{2}}O\] |
| Answer» E. | |
| 9945. |
Which has the smallest size [MP PET 1999] |
| A. | \[N{{a}^{+}}\] |
| B. | \[M{{g}^{2+}}\] |
| C. | \[A{{l}^{3+}}\] |
| D. | \[{{P}^{5+}}\] |
| Answer» E. | |
| 9946. |
A sodium cation has a different number of electrons from |
| A. | \[{{O}^{2-}}\] |
| B. | \[{{F}^{-}}\] |
| C. | \[L{{i}^{-}}\] |
| D. | \[A{{l}^{3+}}\] |
| Answer» D. \[A{{l}^{3+}}\] | |
| 9947. |
An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of [MP PET 2002] |
| A. | Weak acid and weak base |
| B. | Strong acid and weak base |
| C. | Weak acid and strong base |
| D. | Strong acid and strong base |
| Answer» D. Strong acid and strong base | |
| 9948. |
\[\begin{matrix} {{H}_{3}}C & {} & C{{H}_{3}} \\ {} & >C=C< & {} \\ {{H}_{3}}C & {} & C{{H}_{3}} \\ \end{matrix}\underset{KOH\,\text{(heat)}}{\mathop{\xrightarrow{X}}}\,\begin{matrix} C{{H}_{3}} & {} & C{{H}_{3}} \\ {} & >C=O+O=C< & {} \\ C{{H}_{3}} & {} & C{{H}_{3}} \\ \end{matrix}\] \[X\] in the above reaction is [CPMT 1985, 93] |
| A. | \[HN{{O}_{3}}\] |
| B. | \[{{O}_{2}}\] |
| C. | \[{{O}_{3}}\] |
| D. | \[KMn{{O}_{4}}\] |
| Answer» E. | |
| 9949. |
Which of the following is oxidised by \[KMn{{O}_{4}}\] |
| A. | Methane |
| B. | Pentane |
| C. | Isobutane |
| D. | Neopentane |
| Answer» D. Neopentane | |
| 9950. |
Xylenes on oxidation with acidic \[KMn{{O}_{4}}\]gives [JIPMER 2000] |
| A. | Terphthalic acid |
| B. | Phthalic acid |
| C. | Isophthalic acid |
| D. | All of these |
| Answer» E. | |