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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.
| 8051. |
Identify the product D in the following series of reaction \[C{{H}_{3}}COOH\xrightarrow{LiAl{{H}_{4}}}A\underset{443K}{\mathop{\xrightarrow{{{H}^{+}}}}}\,B\xrightarrow{B{{r}_{2}}}C\underset{KOH}{\mathop{\xrightarrow{alc.}}}\,D\] [CBSE PMT 1998] Methane |
| A. | Alcohol |
| B. | Acetylene |
| C. | Benzaldehyde |
| Answer» D. | |
| 8052. |
Nitrogen atom has an atomic number of 7 and oxygen has an atomic number 8. The total number of electrons in a nitrate ion will be [Pb. PMT 2000] |
| A. | 8 |
| B. | 16 |
| C. | 32 |
| D. | 64 |
| Answer» D. 64 | |
| 8053. |
Which one of the following will undergo meta substitution on monochlorination [AIIMS 1991] |
| A. | Ethoxy ethane |
| B. | Chlorobenzene |
| C. | Ethyl benzoate |
| D. | Phenol |
| Answer» D. Phenol | |
| 8054. |
On heating pyrollusite with \[KOH\] in presence of air we get |
| A. | \[KMn{{O}_{4}}\] |
| B. | \[{{K}_{2}}Mn{{O}_{4}}\] |
| C. | \[Mn{{(OH)}_{2}}\] |
| D. | \[M{{n}_{3}}{{O}_{4}}\] |
| Answer» C. \[Mn{{(OH)}_{2}}\] | |
| 8055. |
The phenomenon of radioactivity arises from the [Kerala (Med.) 2002] |
| A. | Binary fission |
| B. | Nuclear fusion |
| C. | Stable nuclei |
| D. | Decay of unstable nuclei |
| Answer» E. | |
| 8056. |
Among the following a natural polymer is [MP PET 1993; BCECE 2005] |
| A. | Cellulose |
| B. | PVC |
| C. | Teflon |
| D. | Polyethylene |
| Answer» B. PVC | |
| 8057. |
\[100\ mL\] of \[P{{H}_{3}}\] on decomposition produced phosphorus and hydrogen. The change in volume is [MNR 1986] |
| A. | \[50\ mL\] increase |
| B. | \[500\ mL\] decrease |
| C. | \[900\ mL\] decrease |
| D. | Nil. |
| Answer» B. \[500\ mL\] decrease | |
| 8058. |
Which of the following is heavy water [AFMC 1997] |
| A. | \[{{H}_{2}}{{O}_{18}}\] |
| B. | \[{{H}_{2}}{{O}_{16}}\] |
| C. | \[{{H}_{2}}{{O}_{3}}\] |
| D. | \[{{D}_{2}}O\] |
| Answer» E. | |
| 8059. |
For the reaction \[{{H}_{2}}(g)+{{I}_{2}}(g)\] ⇌ \[2HI(g)\] , the equilibrium constant changes with [IIT 1981; MNR 1983, 85; NCERT 1984; MP PMT 1987, 97; MP PET/PMT 1988; CPMT 1976, 90; UPSEAT 2000] |
| A. | Total pressure |
| B. | Catalyst |
| C. | The amounts of \[{{H}_{2}}\] and \[{{I}_{2}}\] taken |
| D. | Temperature |
| Answer» E. | |
| 8060. |
A clock spring is heated to redness and then plunged into cold water. This treatment will cause it to become [NCERT 1979] |
| A. | Soft and ductile |
| B. | More springy than before |
| C. | Strongly magnetic |
| D. | Hard and brittle |
| Answer» E. | |
| 8061. |
The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight=78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is [CBSE PMT 2001] |
| A. | \[1.568\times {{10}^{4}}\] |
| B. | \[1.568\times {{10}^{3}}\] |
| C. | \[15.68\] |
| D. | \[3.136\times {{10}^{4}}\] |
| Answer» B. \[1.568\times {{10}^{3}}\] | |
| 8062. |
When dispersed phase is liquid and dispersion medium is gas, then the colloidal system is called [CPMT 1984] |
| A. | Smoke |
| B. | Clouds |
| C. | Emulsion |
| D. | Jellies |
| Answer» C. Emulsion | |
| 8063. |
If excess of \[N{{H}_{4}}OH\] is added to \[CuS{{O}_{4}}\] solution, it forms blue coloured complex which is [MP PMT 1971, 79; Bihar CEE 1995; RPET 1999; AFMC 2001] |
| A. | \[Cu{{(N{{H}_{3}})}_{4}}S{{O}_{4}}\] |
| B. | \[Cu{{(N{{H}_{3}})}_{2}}S{{O}_{4}}\] |
| C. | \[Cu{{(N{{H}_{4}})}_{4}}S{{O}_{4}}\] |
| D. | \[Cu{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] |
| Answer» B. \[Cu{{(N{{H}_{3}})}_{2}}S{{O}_{4}}\] | |
| 8064. |
For preparing 0.1 N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be [MP PET 1996] |
| A. | More than the theoretical weight |
| B. | Less than the theoretical weight |
| C. | Same as the theoretical weight |
| D. | None of these |
| Answer» B. Less than the theoretical weight | |
| 8065. |
In the oxidation of \[Cu\], the reaction which takes place in bessemer converter is [CPMT 1999] |
| A. | \[2CuFe{{S}_{2}}+{{O}_{2}}\to C{{u}_{2}}S+FeS+S{{O}_{2}}\] |
| B. | \[2C{{u}_{2}}S+3{{O}_{2}}\to 2C{{u}_{2}}O+2S{{O}_{2}}\] |
| C. | \[2C{{u}_{2}}O+C{{u}_{2}}S\to 6Cu+S{{O}_{2}}\] |
| D. | \[2FeS+3{{O}_{2}}\to 2FeO+2S{{O}_{2}}\] |
| Answer» D. \[2FeS+3{{O}_{2}}\to 2FeO+2S{{O}_{2}}\] | |
| 8066. |
The most strained cycloalkane is [IIT-JEE 1981] |
| A. | Cyclopropane |
| B. | Cyclobutane |
| C. | Cyclopentane |
| D. | Cyclohexane |
| Answer» B. Cyclobutane | |
| 8067. |
Which of the following has a bond formed by overlap of \[sp-s{{p}^{3}}\] hybrid orbitals [MNR 1993; UPSEAT 2001, 02] |
| A. | \[C{{H}_{3}}-C\equiv C-H\] |
| B. | \[C{{H}_{3}}-CH=CH-C{{H}_{3}}\] |
| C. | \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\] |
| D. | \[HC\equiv CH\] |
| Answer» B. \[C{{H}_{3}}-CH=CH-C{{H}_{3}}\] | |
| 8068. |
Which is true for an element \[R\] present in III group of the periodic table [EAMCET 1991] |
| A. | It is gas at room temperature |
| B. | It has oxidation state of \[+\,4\] |
| C. | It forms \[{{R}_{2}}{{O}_{3}}\] |
| D. | It forms \[R{{X}_{2}}\] |
| Answer» D. It forms \[R{{X}_{2}}\] | |
| 8069. |
The nucleus of an element contain 9 protons. Its valency would be [MP PET 2004] |
| A. | 1 |
| B. | 3 |
| C. | 2 |
| D. | 5 |
| Answer» B. 3 | |
| 8070. |
The equivalent weight of \[KI{{O}_{3}}\] in the reaction \[2Cr{{(OH)}_{3}}+4OH+KI{{O}_{3}}\to 2CrO_{4}^{2-}+5{{H}_{2}}O+KI\] is [MP PMT 2004] |
| A. | Mole wt. |
| B. | \[\frac{\text{Mol}\text{. wt}\text{.}}{\text{6}}\] |
| C. | \[\frac{\text{Mol}\text{. wt}\text{.}}{\text{2}}\] |
| D. | \[\frac{\text{Mol}\text{. wt}\text{.}}{\text{3}}\] |
| Answer» E. | |
| 8071. |
The molecular weight of cellulose varies between |
| A. | 1000 to 20000 |
| B. | 20000 to 500000 |
| C. | 100 to 200 |
| D. | 1000000 to 5000000 |
| Answer» C. 100 to 200 | |
| 8072. |
EDTA combines with cations to form |
| A. | Ion-exchange resins |
| B. | Chelates |
| C. | Clathrates |
| D. | Polymers |
| Answer» C. Clathrates | |
| 8073. |
Maximum entropy will be in which of the following [DCE 2004] |
| A. | Ice |
| B. | Liquid water |
| C. | Snow |
| D. | Water vapours |
| Answer» E. | |
| 8074. |
Mark the variety of iron which has highest melting point |
| A. | Pig iron |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» D. Steel | |
| 8075. |
Nylon threads are made of [MP PMT 2001, 03; AIEEE 2003] |
| A. | Polyvinyl polymer |
| B. | Polyester polymer |
| C. | Polyamide polymer |
| D. | Polyethylene polymer |
| Answer» D. Polyethylene polymer | |
| 8076. |
In a fission reaction the nucleus of an element [NCERT 1977] |
| A. | Loses only some elementary nuclear particles from another nucleus |
| B. | Captures some elementary nuclear particles from another nucleus |
| C. | Breaks up into several smaller nuclei |
| D. | Breaks up into two smaller nuclei with the loss of same elementary nuclear particles |
| Answer» E. | |
| 8077. |
\[p{{K}_{a}}\]value of the strongest acid among the following is [MP PMT 1990] |
| A. | 3.0 |
| B. | 4.5 |
| C. | 1.0 |
| D. | 2.0 |
| Answer» D. 2.0 | |
| 8078. |
If the bond energies of \[H-H\], \[Br-Br\] and \[HBr\] are 433, 192 and 364 \[kJ\,mo{{l}^{-1}}\] respectively, the \[\Delta {{H}^{o}}\] for the reaction, \[{{H}_{2}}(g)+B{{r}_{2}}(g)\to 2HBr(g)\] is [CBSE PMT 2004] |
| A. | + 261 kJ |
| B. | ? 103 kJ |
| C. | ? 261 kJ |
| D. | + 103 kJ |
| Answer» C. ? 261 kJ | |
| 8079. |
Which of the following is a lyophilic colloid [MP PET/PMT 1998] |
| A. | Milk |
| B. | Gum |
| C. | Fog |
| D. | Blood |
| Answer» C. Fog | |
| 8080. |
For an aqueous solution, the characteristic species of acid is [RPMT 1999] |
| A. | \[{{H}^{+}}\]ion |
| B. | \[{{H}_{3}}{{O}^{+}}\]ion |
| C. | \[{{H}_{2}}^{+}\]ion |
| D. | \[{{H}_{4}}{{O}^{+}}\]ion |
| Answer» B. \[{{H}_{3}}{{O}^{+}}\]ion | |
| 8081. |
Which of the following is a biodegradable polymer [AIIMS 2004] |
| A. | Cellulose |
| B. | Polythene |
| C. | Polyvinyl chloride |
| D. | Nylon-6 |
| Answer» B. Polythene | |
| 8082. |
Which of the following bonds is most acidic |
| A. | = C - H |
| B. | \[-C-H\] |
| C. | \[\equiv C-H\] |
| D. | All are equally acidic |
| Answer» D. All are equally acidic | |
| 8083. |
Gelatin is mostly used in making ice cream in order to [NCERT 1979; MP PET/PMT 1988] |
| A. | Prevent making of colloid |
| B. | To stabilise the colloid and prevent crystallization |
| C. | To stabilise mixture |
| D. | To enrich the aroma |
| Answer» C. To stabilise mixture | |
| 8084. |
Which hydroxide will have lowest value of solubility product at normal temperature \[({{25}^{o}}C)\] [IIT 1990; RPMT 1997] |
| A. | \[Mg\,{{(OH)}_{2}}\] |
| B. | \[Ca\,{{(OH)}_{2}}\] |
| C. | \[Ba\,{{(OH)}_{2}}\] |
| D. | \[Be\,{{(OH)}_{2}}\] |
| Answer» E. | |
| 8085. |
For artificial transmutation of nuclei, the most effective one is [MP PMT 1996] |
| A. | Proton |
| B. | Deuteron |
| C. | Helium nuclei |
| D. | Neutron |
| Answer» E. | |
| 8086. |
Gold number is minimum in case of [MP PMT 1985] |
| A. | Gelatin |
| B. | Egg albumin |
| C. | Gum arabic |
| D. | Starch |
| Answer» B. Egg albumin | |
| 8087. |
Which of the following is called white vitriol [MP PET 1990; Bihar MEE 1995; BVP 2004] |
| A. | \[ZnC{{l}_{2}}\] |
| B. | \[MgS{{O}_{4}}.7{{H}_{2}}O\] |
| C. | \[ZnS{{O}_{4}}.7{{H}_{2}}O\] |
| D. | \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] |
| Answer» D. \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] | |
| 8088. |
Petroleum is mainly a mixture of [CPMT 1984; Pb. PMT 1999] |
| A. | Alkanes |
| B. | Cyclohexane |
| C. | Benzenoid hydrocarbons |
| D. | Alkenes |
| Answer» B. Cyclohexane | |
| 8089. |
What is the effect of shaking dil. \[{{H}_{2}}S{{O}_{4}}\] with small quantity of anhydrous \[CuS{{O}_{4}}\] [NCERT 1975; CPMT 1975, 88] |
| A. | The white solid dissolves to form a colourless solution |
| B. | The white solid dissolves to form a green solution |
| C. | The white solid turns blue but does not dissolve |
| D. | The white solid dissolves to form a blue solution |
| Answer» E. | |
| 8090. |
In electroplating, the metal that is not used for plating is [Pune CET 1998] |
| A. | \[Fe\] |
| B. | \[Zn\] |
| C. | \[Ni\] |
| D. | \[Au\] |
| Answer» B. \[Zn\] | |
| 8091. |
An enzyme which brings about the conversion of starch into maltose is known as [BHU 1979] |
| A. | Maltase |
| B. | Zymase |
| C. | Invertase |
| D. | Diastase |
| Answer» E. | |
| 8092. |
Number of \[\pi \] bonds in \[C{{H}_{2}}=CH-CH=CH-C\equiv CH\] is [Kurukshetra CEE 1991; KCET 2000] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 8093. |
Which one is organometallic compound [MP PMT 2004] |
| A. | Lithium methoxide |
| B. | Lithium dimethyl amide |
| C. | Lithium acetate |
| D. | Methyl lithium |
| Answer» E. | |
| 8094. |
Surface tension of lyophilic sols is [MP PMT 2002] |
| A. | Lower than that of \[{{H}_{2}}O\] |
| B. | More than that of \[{{H}_{2}}O\] |
| C. | Equal to that of \[{{H}_{2}}O\] |
| D. | None of these |
| Answer» B. More than that of \[{{H}_{2}}O\] | |
| 8095. |
At 25°C specific conductivity of a normal solution of KCl is 0.002765 mho. The resistance of cell is 400 ohms. The cell constant is [Pb.PMT 2004] |
| A. | 0.815 |
| B. | 1.016 |
| C. | 1.106 |
| D. | 2.016 |
| Answer» D. 2.016 | |
| 8096. |
The molecular mass of acetic acid dissolved in water is 60 and when dissolved in benzene it is 120.This difference in behaviour of \[C{{H}_{3}}COOH\] is because [AMU 2000] |
| A. | Water prevents association of acetic acid |
| B. | Acetic acid does not fully dissolve in water |
| C. | Acetic acid fully dissolves in benzene |
| D. | Acetic acid does not ionize in benzene |
| Answer» C. Acetic acid fully dissolves in benzene | |
| 8097. |
\[{{C}_{6}}{{H}_{6}}+C{{H}_{3}}Cl\underset{AlC{{l}_{3}}}{\mathop{\xrightarrow{\text{anhydrous}}}}\,{{C}_{6}}{{H}_{5}}C{{H}_{3}}+HCl\] is an example of [NCERT 1979; CPMT 1974, 85, 90; Bihar CEE 1995; BHU 1979, 2001; MP PET 1995; MP PMT 1995; KCET 1993; EAMCET 1998; AIIMS 1998; CBSE PMT 2000; AFMC 2000; JIPMER 2000] |
| A. | Friedel-Craft's reaction |
| B. | Kolbe's synthesis |
| C. | Wurtz reaction |
| D. | Grignard reaction |
| Answer» B. Kolbe's synthesis | |
| 8098. |
In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti-Markovnikoff?s addition to alkenes because [IIT-JEE Screening 2001] |
| A. | Both are highly ionic |
| B. | One is oxidising and the other is reducing |
| C. | One of the steps is endothermic in both the cases |
| D. | All the steps are exothermic in both the cases |
| Answer» D. All the steps are exothermic in both the cases | |
| 8099. |
From aqueous solution of \[ZnS{{O}_{4}}\], normal zinc carbonate may be precipitated by [CPMT 1973] |
| A. | Boiling with \[CaC{{O}_{3}}\] |
| B. | Adding \[N{{a}_{2}}C{{O}_{3}}\] |
| C. | Adding \[NaHC{{O}_{3}}\] |
| D. | Passing \[C{{O}_{2}}\] |
| Answer» D. Passing \[C{{O}_{2}}\] | |
| 8100. |
The aqueous solution of a carbohydrate gives dark blue colour with iodine. It is |
| A. | Glucose |
| B. | Fructose |
| C. | Sucrose |
| D. | Starch |
| Answer» E. | |