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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.
| 9251. |
The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to [IIT 1996] |
| A. | Ionization of benzoic acid |
| B. | Dimerization of benzoic acid |
| C. | Trimerization of benzoic acid |
| D. | Solvation of benzoic acid |
| Answer» C. Trimerization of benzoic acid | |
| 9252. |
Energy of the electron in Hydrogen atom is given by [AMU (Engg.) 2002] |
| A. | \[{{E}_{n}}=-\frac{131.38}{{{n}^{2}}}\,kJ\,mo{{l}^{-1}}\] |
| B. | \[{{E}_{n}}=-\frac{131.33}{n}\,kJ\,mo{{l}^{-1}}\] |
| C. | \[{{E}_{n}}=-\frac{1313.3}{{{n}^{2}}}\,kJ\,mo{{l}^{-1}}\] |
| D. | \[{{E}_{n}}=-\frac{313.13}{{{n}^{2}}}\,kJ\,mo{{l}^{-1}}\] |
| Answer» D. \[{{E}_{n}}=-\frac{313.13}{{{n}^{2}}}\,kJ\,mo{{l}^{-1}}\] | |
| 9253. |
In order to prepare one litre normal solution of \[KMn{{O}_{4}}\], how many grams of \[KMn{{O}_{4}}\] are required if the solution is used in acidic medium for oxidation [MP PET 2002] |
| A. | 158 g |
| B. | 31.6 g |
| C. | 790 g |
| D. | 62 g |
| Answer» C. 790 g | |
| 9254. |
The compound \[{{C}_{3}}{{H}_{4}}\] has a triple bond, which is indicated by its reaction with [MP PMT 1999] |
| A. | Bromine water |
| B. | Bayer's reagent |
| C. | Fehling solution |
| D. | Ammonical silver nitrate |
| Answer» E. | |
| 9255. |
The purification of alumina is called [CPMT 1997; AFMC 1998; AIIMS 1999] |
| A. | Bosch process |
| B. | Caster process |
| C. | Baeyer's process |
| D. | Hoop's process |
| Answer» D. Hoop's process | |
| 9256. |
In the Castner?s process for the extraction of sodium, the anode is made of.......metal. [EAMCET 2003] |
| A. | Copper |
| B. | Iron |
| C. | Sodium |
| D. | Nickel |
| Answer» D. Nickel | |
| 9257. |
How many g of a dibasic acid (Mol. wt. = 200) should be present in 100 ml of its aqueous solution to give decinormal strength [AIIMS 1992] |
| A. | 1 g |
| B. | 2 g |
| C. | 10 g |
| D. | 20 g |
| Answer» B. 2 g | |
| 9258. |
The correct formula of hypo is |
| A. | \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}.5{{H}_{2}}O\] |
| B. | \[N{{a}_{2}}S{{O}_{4}}\] |
| C. | \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}.4{{H}_{2}}O\] |
| D. | \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}.3{{H}_{2}}O\] |
| Answer» B. \[N{{a}_{2}}S{{O}_{4}}\] | |
| 9259. |
Acrylic resins are |
| A. | Colourless and transparent |
| B. | Dark brown and thermosetting |
| C. | Dark brown and thermoplastic |
| D. | White like milk |
| Answer» B. Dark brown and thermosetting | |
| 9260. |
Which of the following relations gives the value of n = [Bihar MEE 1996] |
| A. | \[\frac{\text{Moleculer Mass}}{\text{Atomic Mass}}\] |
| B. | \[\frac{\text{Molecular Mass}}{\text{Empirical Mass}}\] |
| C. | \[\frac{\text{Empirical Mass}}{\text{Molecular Mass}}\] |
| D. | None of these |
| Answer» C. \[\frac{\text{Empirical Mass}}{\text{Molecular Mass}}\] | |
| 9261. |
A sodium salt on treatment with \[MgC{{l}_{2}}\]gives white precipitate only on heating. The anion of the sodium salt is [IIT JEE Screening 2004] |
| A. | \[HCO_{3}^{-}\] |
| B. | \[CO_{3}^{2-}\] |
| C. | \[NO_{3}^{-}\] |
| D. | \[SO_{4}^{2-}\] |
| Answer» B. \[CO_{3}^{2-}\] | |
| 9262. |
The metal that is extracted from sea water is [EAMCET 1978; CPMT 1988; CET Pune 1998; MP PET 2000] |
| A. | \[Ba\] |
| B. | \[Mg\] |
| C. | \[Ca\] |
| D. | \[Sr\] |
| Answer» C. \[Ca\] | |
| 9263. |
Which of the following substance is used as dehydrating agent in laboratory [MP PMT 1987] |
| A. | Calcium chloride |
| B. | Sodium chloride |
| C. | Sodium carbonate |
| D. | Potassium nitrate |
| Answer» B. Sodium chloride | |
| 9264. |
Would gaseous HCl be considered as an Arrhenius acid [UPSEAT 2004] |
| A. | Yes |
| B. | No |
| C. | Not known |
| D. | Gaseous HCl does not exist |
| Answer» C. Not known | |
| 9265. |
Paraffin wax is [MP PMT 1986; CPMT 1993] |
| A. | Ester |
| B. | Alcohol |
| C. | Unsaturated hydrocarbon |
| D. | Saturated hydrocarbon |
| Answer» E. | |
| 9266. |
The size of the following species increases in the order [IIT-JEE 1990; AFMC 1995] |
| A. | \[M{{g}^{2+}}<N{{a}^{+}}<{{F}^{-}}<Al\] |
| B. | \[{{F}^{-}}<Al<N{{a}^{+}}>M{{g}^{2+}}\] |
| C. | \[Al<Mg<{{F}^{-}}<N{{a}^{+}}\] |
| D. | \[N{{a}^{+}}<Al<{{F}^{-}}<M{{g}^{2+}}\] |
| Answer» B. \[{{F}^{-}}<Al<N{{a}^{+}}>M{{g}^{2+}}\] | |
| 9267. |
In third row of periodic table the atomic radii from \[Na\] to \[Cl\] [MP PMT 1986] |
| A. | Continuosly decreases |
| B. | Continuosly increases |
| C. | Remains constant |
| D. | Increases but not continuously |
| Answer» B. Continuosly increases | |
| 9268. |
A volume of 1 \[{{m}^{3}}\] is equal to |
| A. | \[1000\,c{{m}^{3}}\] |
| B. | \[100\,c{{m}^{3}}\] |
| C. | \[10\,d{{m}^{3}}\] |
| D. | \[{{10}^{6}}\,c{{m}^{3}}\] |
| Answer» E. | |
| 9269. |
What volume of \[N{{H}_{3}}\]gas at STP would be needed to prepare 100ml of 2.5 molal (2.5m) ammonium hydroxide solution |
| A. | 0.056 litres |
| B. | 0.56 litres |
| C. | 5.6 litres |
| D. | 11.2 litres |
| Answer» D. 11.2 litres | |
| 9270. |
Which one of the following compounds gives methane on treatment with water [Kerala PMT 2004; MH CET 2004] |
| A. | \[A{{l}_{4}}{{C}_{3}}\] |
| B. | \[Ca{{C}_{2}}\] |
| C. | VC |
| D. | \[SiC\] |
| E. | \[{{B}_{4}}C\] |
| Answer» B. \[Ca{{C}_{2}}\] | |
| 9271. |
The types of hybridization present in 1, 2- butadiene are [MH CET 2000] |
| A. | \[sp,s{{p}^{2}}\,\,\text{and}\,\,s{{p}^{3}}\] |
| B. | \[s{{p}^{2}}\,\,\text{and}\,\,s{{p}^{3}}\] |
| C. | \[s{{p}^{2}}\,\,\text{and}\,\,sp\] |
| D. | \[sp\,\,\text{and}\,\,s{{p}^{3}}\] |
| Answer» B. \[s{{p}^{2}}\,\,\text{and}\,\,s{{p}^{3}}\] | |
| 9272. |
Discovery of 'nylon' is associated with |
| A. | Newyork and London |
| B. | Newyork and Longuet |
| C. | Nyholm and London |
| D. | None of these |
| Answer» B. Newyork and Longuet | |
| 9273. |
Mark the correct statement in a reversible reaction [CPMT 1974; EAMCET 1978, 79; MP PMT 1993] |
| A. | The catalyst catalyses the forward reaction |
| B. | The catalyst catalyses the backward reaction |
| C. | The catalyst influences the direct and the reverse reaction to the same extent |
| D. | The catalyst increases the rate of forward reaction and decreases the rate of backward reaction |
| Answer» D. The catalyst increases the rate of forward reaction and decreases the rate of backward reaction | |
| 9274. |
Methane can be prepared by [DCE 2001] |
| A. | Wurtz's reaction |
| B. | Decarboxylation |
| C. | Hydrogenation reaction |
| D. | All of these |
| Answer» C. Hydrogenation reaction | |
| 9275. |
Paste is [MHCET 2004] |
| A. | Suspension of solid in a liquid |
| B. | Mechanical dispersion of a solid in liquid |
| C. | Colloidal solution of a solid in solid |
| D. | None of these |
| Answer» B. Mechanical dispersion of a solid in liquid | |
| 9276. |
The correct order towards bond length is [RPMT 1997] |
| A. | \[C-C<C=C<C\equiv C\] |
| B. | \[C\equiv C<C=C<C-C\] |
| C. | \[C=C<C\equiv C<C-C\] |
| D. | \[C=C<C-C<C\equiv C\] |
| Answer» C. \[C=C<C\equiv C<C-C\] | |
| 9277. |
Which one of the following compounds does not give addition reactions [MADT Bihar 1981] |
| A. | Aldehydes |
| B. | Alkanes |
| C. | Alkenes |
| D. | Alkynes |
| E. | Ketones |
| Answer» C. Alkenes | |
| 9278. |
Which one of the following groupings represents a collection of isoelectronic species [AIEEE 2003] |
| A. | \[N{{a}^{+}},\,C{{a}^{2+}},M{{g}^{2+}}\] |
| B. | \[{{N}^{3-}},\,{{F}^{-}},\,N{{a}^{+}}\] |
| C. | \[Be,\,A{{l}^{3+}},\,C{{l}^{-}}\] |
| D. | \[C{{a}^{2+}},\,C{{s}^{+}},\,Br\] |
| Answer» C. \[Be,\,A{{l}^{3+}},\,C{{l}^{-}}\] | |
| 9279. |
Solubility of \[AgCl\] will be minimum in [CBSE PMT 1995] |
| A. | \[0.001\,M\,AgN{{O}_{3}}\] |
| B. | Pure water |
| C. | \[0.30\,\,M\] |
| D. | \[0.01\,M\,NaCl\] |
| Answer» D. \[0.01\,M\,NaCl\] | |
| 9280. |
The nuclear binding energy for \[Ar\](39.962384 amu) is: (given mass of proton and neutron are 1.007825 amu and 1.008665 amu respectively) [Pb.CET 2002] |
| A. | \[343.81\ MeV\] |
| B. | \[0.369096\ MeV\] |
| C. | \[931\ MeV\] |
| D. | None of these |
| Answer» B. \[0.369096\ MeV\] | |
| 9281. |
Which of the following is the most stable |
| A. | 1-butene |
| B. | 2-butene |
| C. | 1-pentene |
| D. | 2-pentene |
| Answer» E. | |
| 9282. |
The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with \[ZnS{{O}_{4}}.7{{H}_{2}}O\]. The atomic weight of M is [IIT 1991] |
| A. | 40.3 |
| B. | 36.3 |
| C. | 24.3 |
| D. | 11.3 |
| Answer» D. 11.3 | |
| 9283. |
The intermediate during the addition of HCl to propene in the presence of peroxide is [IIT-JEE 1997] |
| A. | \[C{{H}_{3}}\overset{\bullet \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CHC{{H}_{2}}}}\,Cl\] |
| B. | \[\overset{+\,\,\,\,\,}{\mathop{C{{H}_{3}}CHC{{H}_{3}}}}\,\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}\overset{\bullet \,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}\overset{+\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,\] |
| Answer» C. \[C{{H}_{3}}C{{H}_{2}}\overset{\bullet \,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,\] | |
| 9284. |
Amylopectin is [KCET 2005] |
| A. | Water soluble |
| B. | Water insoluble |
| C. | Forms colloidal solution with water |
| D. | Both B and C |
| Answer» C. Forms colloidal solution with water | |
| 9285. |
The chemical processes in the production of steel from haematite ore involve [IIT-JEE (Screening) 2000] |
| A. | Reduction |
| B. | Oxidation |
| C. | Reduction followed by oxidation |
| D. | Oxidation followed by reduction |
| Answer» E. | |
| 9286. |
IUPAC name of the following compound is \[C{{H}_{3}}-\underset{{{C}_{6}}{{H}_{5}}\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{H\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C-C{{H}_{2}}}}\,}}\,}}\,}}\,-C{{H}_{3}}\] [MP PMT 1986] |
| A. | 2-cyclohexylbutane |
| B. | 2-phenylbutane |
| C. | 3-cyclohexylbutane |
| D. | 3-phenylbutane |
| Answer» C. 3-cyclohexylbutane | |
| 9287. |
The first controlled artificial disintegration of an atomic nucleus was achieved by [BHU 1987] |
| A. | Geiger |
| B. | Wilson |
| C. | Cockcroft |
| D. | Rutherford |
| Answer» E. | |
| 9288. |
Which of the following salt has the same value of Van't Hoff factor \[i\] as that of \[{{K}_{3}}[Fe{{(CN)}_{6}}]\] [CBSE PMT 1994; AIIMS 1998] |
| A. | \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] |
| B. | \[NaCl\] |
| C. | \[N{{a}_{2}}S{{O}_{4}}\] |
| D. | \[Al{{(N{{O}_{3}})}_{3}}\] |
| Answer» B. \[NaCl\] | |
| 9289. |
On passing a current of \[HCl\] gas in a saturated solution of \[NaCl,\] the solubility of \[NaCl\] [CPMT 1989; CBSE PMT 1989] |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | \[NaCl\]decomposes |
| Answer» C. Remains unchanged | |
| 9290. |
Silica is added to roasted copper ore during smelting in order to remove [KCET 1998] |
| A. | Cuprous sulphide |
| B. | Cuprous oxide |
| C. | Ferrous oxide |
| D. | Ferrous sulphide |
| Answer» D. Ferrous sulphide | |
| 9291. |
A simple example of a coordinate covalent bond is exhibited by [NCERT 1984] |
| A. | \[{{C}_{2}}{{H}_{2}}\] |
| B. | \[{{H}_{2}}S{{O}_{4}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[HCl\] |
| Answer» C. \[{{H}_{2}}O\] | |
| 9292. |
Which of the following is not an example of natural polymer [BHU 1987] |
| A. | Wool |
| B. | Silk |
| C. | Leather |
| D. | Nylon |
| Answer» E. | |
| 9293. |
Benzene is the polymer of [RPET 1999; Bihar MEE 1999] |
| A. | Methane |
| B. | Ethane |
| C. | Ethylene |
| D. | Ethyne |
| Answer» E. | |
| 9294. |
Magnitude of which of the following property of alkali metals increases with the increase of atomic number [MP PMT 1987] |
| A. | Electronegativity |
| B. | Ionic radius |
| C. | First ionization energy |
| D. | Melting point |
| Answer» C. First ionization energy | |
| 9295. |
Valency electrons in alkali metals are [CPMT 1972] |
| A. | 1 |
| B. | 7 |
| C. | 4 |
| D. | 2 |
| Answer» B. 7 | |
| 9296. |
Ratio of \[{{C}_{p}}\]and \[{{C}_{v}}\]of a gas X is 1.4, the number of atom of the gas ?X? present in 11.2 litres of it at NTP will be [CBSE 1999] |
| A. | \[6.02\times {{10}^{23}}\] |
| B. | \[1.2\times {{10}^{23}}\] |
| C. | \[3.01\times {{10}^{23}}\] |
| D. | \[2.01\times {{10}^{23}}\] |
| Answer» B. \[1.2\times {{10}^{23}}\] | |
| 9297. |
A solution of sodium acetate in water will [MNR 1979] |
| A. | Turn red litmus blue |
| B. | Turn blue litmus red |
| C. | Not effect litmus |
| D. | Decolorizes litmus |
| Answer» B. Turn blue litmus red | |
| 9298. |
In the reaction \[SnC{{l}_{2}}+2C{{l}^{-}}\to SnC{{l}_{4}},\] Lewis acid is [EAMCET 1987] |
| A. | \[SnC{{l}_{2}}\] |
| B. | \[C{{l}^{-}}\] |
| C. | \[SnC{{l}_{4}}\] |
| D. | None of these |
| Answer» B. \[C{{l}^{-}}\] | |
| 9299. |
The solvent which neither accepts proton nor donates proton is called [RPMT 2000] |
| A. | Amphoteric |
| B. | Neutral |
| C. | Aprotic |
| D. | Amphiprotic |
| Answer» D. Amphiprotic | |
| 9300. |
In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to [KCET 2004] |
| A. | Minimize the heat loss due to radiation |
| B. | Protect aluminium produced from oxygen |
| C. | Dissolve bauxite and render it conductor of electricity |
| D. | Lower the melting point of bauxite |
| Answer» D. Lower the melting point of bauxite | |