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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.
| 8251. |
By Wurtz reaction, a mixture of methyliodide and ethyliodide gives [BHU 2003] |
| A. | Butane |
| B. | Ethane |
| C. | Propane |
| D. | A mixture of the above three |
| Answer» E. | |
| 8252. |
Bohr's model can explain [IIT 1985] |
| A. | The spectrum of hydrogen atom only |
| B. | Spectrum of atom or ion containing one electron only |
| C. | The spectrum of hydrogen molecule |
| D. | The solar spectrum |
| Answer» C. The spectrum of hydrogen molecule | |
| 8253. |
Which of the following is(are) example(s) of nucleophilic addition reaction in case of acetylene |
| A. | Addition of water |
| B. | Addition of HCN |
| C. | Addition of \[AsC{{l}_{3}}\] |
| D. | All |
| Answer» E. | |
| 8254. |
Which one of the following is lyophilic colloid [MP PET 1989] |
| A. | Gelatin |
| B. | Sulphur |
| C. | Gold |
| D. | Carbon |
| Answer» B. Sulphur | |
| 8255. |
The chief constituents of steel made in India are [MP PMT/PET 1988] |
| A. | \[Mn\] and \[Cr\] |
| B. | \[Al\] and \[Zn\] |
| C. | \[V\] and \[Co\] |
| D. | \[Ni\] and \[Mg\] |
| Answer» B. \[Al\] and \[Zn\] | |
| 8256. |
Which is not a electrophile [RPET 1999] |
| A. | \[AlC{{l}_{3}}\] |
| B. | \[B{{F}_{3}}\] |
| C. | \[{{(C{{H}_{3}})}_{3}}{{C}^{+}}\] |
| D. | \[N{{H}_{3}}\] |
| Answer» E. | |
| 8257. |
The aqueous solution of ammonium chloride is [CPMT 1987] |
| A. | Neutral |
| B. | Basic |
| C. | Acidic |
| D. | Amphoteric |
| Answer» D. Amphoteric | |
| 8258. |
Muddy water can be purified through coagulation using [J & K 2005] |
| A. | Common salt |
| B. | Alums |
| C. | Sand |
| D. | Lime |
| Answer» C. Sand | |
| 8259. |
The disappearance of the characteristic purple colour of \[KMn{{O}_{4}}\] in its reaction with an alkene is the test for unsaturation. It is known as [CPMT 1989, 94; CBSE PMT 1990] |
| A. | Markownikoff's test |
| B. | Baeyer's test |
| C. | Wurtz's test |
| D. | Grignard test |
| Answer» C. Wurtz's test | |
| 8260. |
Which of petroleum corresponds to kerosene oil [DCE 1999] |
| A. | \[{{C}_{15}}-{{C}_{18}}\] |
| B. | \[{{C}_{10}}-{{C}_{12}}\] |
| C. | \[{{C}_{5}}-{{C}_{9}}\] |
| D. | \[{{C}_{1}}-{{C}_{9}}\] |
| Answer» C. \[{{C}_{5}}-{{C}_{9}}\] | |
| 8261. |
The standard cell potential of \[Zn|Z{{n}^{2+}}_{(aq)}||C{{u}^{2+}}_{(aq)}|Cu\] cell is 1.10 V. The maximum work obtained by this cell will be [MP PET 2002] |
| A. | 106.15 kJ |
| B. | ? 212.30 kJ |
| C. | ? 318.45 kJ |
| D. | ? 424.60 kJ |
| Answer» C. ? 318.45 kJ | |
| 8262. |
Hydrogen?oxygen fuel cells are used in space?craft to supply [MP PMT 1993; MP PET 1999] |
| A. | Power for heat and light |
| B. | Power for pressure |
| C. | Oxygen |
| D. | Water |
| Answer» C. Oxygen | |
| 8263. |
The atomic number of a radioactive element increases by one unit in [EAMCET 1997] |
| A. | Alpha emission |
| B. | Beta emission |
| C. | Gamma emission |
| D. | Electron capture |
| Answer» C. Gamma emission | |
| 8264. |
When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid [MP PMT 1997] |
| A. | Decreases |
| B. | Increases |
| C. | Remains unaffected |
| D. | Decreases first then increases |
| Answer» C. Remains unaffected | |
| 8265. |
When hypo solution is added to cupric sulphate solution, the blue colour of the latter is discharged, due to formation of |
| A. | \[Cu{{S}_{2}}{{O}_{3}}\] |
| B. | \[N{{a}_{2}}{{S}_{4}}{{O}_{6}}\] |
| C. | \[NaCu{{S}_{2}}{{O}_{3}}\] |
| D. | \[C{{u}_{2}}O\] |
| Answer» D. \[C{{u}_{2}}O\] | |
| 8266. |
The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant \[=\,1.097\,\times \,{{10}^{7}}{{m}^{-1}}\]) [AIEEE 2004] |
| A. | 406 nm |
| B. | 192 nm |
| C. | 91 nm |
| D. | \[9.1\,\times \,{{10}^{-8}}\,\,nm\] |
| Answer» D. \[9.1\,\times \,{{10}^{-8}}\,\,nm\] | |
| 8267. |
The solubility product of \[BaS{{O}_{4}}\] is \[1.3\times {{10}^{-9}}\]. The solubility of this salt in pure water will be [MP PET 2002] |
| A. | \[1.69\times {{10}^{-9}}mol\,litr{{e}^{-1}}\] |
| B. | \[1.69\times {{10}^{-18}}mol\,litr{{e}^{-1}}\] |
| C. | \[3.6\times {{10}^{-18}}mol\,litr{{e}^{-1}}\] |
| D. | \[3.6\times {{10}^{-5}}mol\,litr{{e}^{-1}}\] |
| Answer» E. | |
| 8268. |
Which one of the following reacts with concentrated sulphuric acid [EAMCET 1998] |
| A. | \[Au\] |
| B. | \[Ag\] |
| C. | \[Pt\] |
| D. | \[Pb\] |
| Answer» C. \[Pt\] | |
| 8269. |
The type of hybridisation of boron in diborane is [CPMT 1999] |
| A. | sp-hybridisation |
| B. | \[s{{p}^{2}}\text{-}\]hybridisation |
| C. | \[s{{p}^{3}}\text{-}\]hybridization |
| D. | \[s{{p}^{3}}{{d}^{2}}\text{-}\]hybridization |
| Answer» D. \[s{{p}^{3}}{{d}^{2}}\text{-}\]hybridization | |
| 8270. |
Stainless steel is an alloy of iron with [DCE 1999] |
| A. | 8% Cr, 50% Mn |
| B. | 10% Ni, 2% Mn |
| C. | 2% Cr, 3% C |
| D. | 12% Cr, 1% N |
| Answer» B. 10% Ni, 2% Mn | |
| 8271. |
The expression for the solubility product of \[A{{l}_{2}}\,{{(S{{O}_{4}})}_{3}}\]is |
| A. | \[{{K}_{sp}}=[A{{l}^{3+}}]\,\,(SO_{4}^{2-}]\] |
| B. | \[{{K}_{sp}}={{[A{{l}^{3+}}]}^{2}}\,\,{{(SO_{4}^{2-}]}^{3}}\] |
| C. | \[{{K}_{sp}}={{[A{{l}^{3+}}]}^{3}}\,\,{{(SO_{4}^{2-}]}^{2}}\] |
| D. | \[{{K}_{sp}}={{[A{{l}^{3+}}]}^{2}}\,\,{{(SO_{4}^{2-}]}^{2}}\] |
| Answer» C. \[{{K}_{sp}}={{[A{{l}^{3+}}]}^{3}}\,\,{{(SO_{4}^{2-}]}^{2}}\] | |
| 8272. |
Which one of the following characteristics apply to both ethene and ethyne [NCERT 1990] |
| A. | Explode when mixed with chlorine |
| B. | Decolourise Baeyer's reagent giving brown precipitate |
| C. | Rapidly absorbed by cold conc. \[{{H}_{2}}S{{O}_{4}}\] |
| D. | Form white precipitate with silver nitrate solution |
| Answer» C. Rapidly absorbed by cold conc. \[{{H}_{2}}S{{O}_{4}}\] | |
| 8273. |
0.01 molar solutions of glucose, phenol and potassium chloride were prepared in water. The boiling points of |
| A. | Glucose solution = Phenol solution = Potassium chloride solution |
| B. | Potassium chloride solution > Glucose solution > Phenol solution |
| C. | Phenol solution > Potassium chloride solution > Glucose solution |
| D. | Potassium chloride solution > Phenol solution > Glucose solution |
| Answer» E. | |
| 8274. |
Acetylenic hydrogens are acidic because [CBSE PMT 1989; Pb. PMT 1999] |
| A. | Sigma electron density of C-H bond in acetylene is nearer to carbon, which has 50% s-character |
| B. | Acetylene has only one hydrogen on each carbon |
| C. | Acetylene contains least number of hydrogens among the possible hydrocarbons having two carbons |
| D. | Acetylene belongs to the class of alkynes with molecular formula \[{{C}_{n}}{{H}_{2n-2}}\] |
| Answer» B. Acetylene has only one hydrogen on each carbon | |
| 8275. |
Which of the statement is wrong among the following [AFMC 1993] |
| A. | Haber's process of \[N{{H}_{3}}\] requires iron as catalyst |
| B. | Friedel?Craft's reaction uses anhydrous \[AlC{{l}_{3}}\] |
| C. | Hydrogenation of oils uses iron as catalyst |
| D. | Oxidation of \[S{{O}_{2}}\] to \[S{{O}_{3}}\] requires \[{{V}_{2}}{{O}_{5}}\] |
| Answer» D. Oxidation of \[S{{O}_{2}}\] to \[S{{O}_{3}}\] requires \[{{V}_{2}}{{O}_{5}}\] | |
| 8276. |
Which of the following statement is true. The entropy of the universe [MP PMT 1993; CET Pune 1998] |
| A. | Increases and tends towards maximum value |
| B. | Decreases and tends to be zero |
| C. | Remains constant |
| D. | Decreases and increases with a periodic rate |
| Answer» B. Decreases and tends to be zero | |
| 8277. |
As the number of carbon atoms in a chain increases the boiling point of alkanes [AFMC 1989] |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | May increase or decrease |
| Answer» B. Decreases | |
| 8278. |
Brass is an alloy of [DPMT 1982, 83; CPMT 1972, 80, 89; MLNR 1985; AFMC 1990; Pb. CET 2004; EAMCET 1993; MP PMT 1996; KCET 2000] |
| A. | Zn and Sn |
| B. | Zn and Cu |
| C. | Cu, Zn and Sn |
| D. | Cu and Sn |
| Answer» C. Cu, Zn and Sn | |
| 8279. |
5 ml of N HCl, 20 ml of \[N/2\,\,{{H}_{2}}S{{O}_{4}}\] and 30 ml of \[N/3\,\,HN{{O}_{3}}\] are mixed together and volume made to one litre. The normality of the resulting solution is [MNR 1991] |
| A. | \[N/5\] |
| B. | \[N/10\] |
| C. | \[N/20\] |
| D. | \[N/40\] |
| Answer» E. | |
| 8280. |
Iron on reacting with carbon give |
| A. | FeC |
| B. | \[F{{e}_{2}}C\] |
| C. | \[F{{e}_{3}}C\] |
| D. | \[Fe{{C}_{2}}\] |
| Answer» D. \[Fe{{C}_{2}}\] | |
| 8281. |
Which of the following can stabilize gold sol from coagulation by \[NaCl\] solution |
| A. | \[Fe{{(OH)}_{3}}\] |
| B. | Gelatin |
| C. | \[A{{s}_{2}}{{S}_{3}}\] |
| D. | None of these |
| Answer» C. \[A{{s}_{2}}{{S}_{3}}\] | |
| 8282. |
Which of the following complexes show six coordination number [RPET 2000] |
| A. | \[{{[Zn{{(CN)}_{4}}]}^{2-}}\] |
| B. | \[{{[Cr{{({{H}_{2}}O)}_{6}}]}^{3+}}\] |
| C. | \[{{[Cu{{(CN)}_{4}}]}^{2-}}\] |
| D. | \[{{[Ni{{(N{{H}_{3}})}_{4}}]}^{2+}}\] |
| Answer» C. \[{{[Cu{{(CN)}_{4}}]}^{2-}}\] | |
| 8283. |
Which of the following attacks glass [NCERT 1976; AFMC 2005] |
| A. | HCl |
| B. | HF |
| C. | HI |
| D. | HBr |
| Answer» C. HI | |
| 8284. |
Indigestible carbohydrate, which is also a constituent of our diet, is [Kerala (Med.) 1999] |
| A. | Cellulose |
| B. | Galactose |
| C. | Maltose |
| D. | Starch |
| Answer» B. Galactose | |
| 8285. |
Glucose will show mutarotation when solvent is [MP PMT 1986] |
| A. | Acidic |
| B. | Basic |
| C. | Neutral |
| D. | Amphoteric |
| Answer» D. Amphoteric | |
| 8286. |
0.2 gm of fine animal charcoal is mixed with half litre of acetic acid solution and shaken for 30 minutes [DPMT 2004] |
| A. | Concentration remains same |
| B. | Concentration increases |
| C. | Concentration of the solution decrease |
| D. | None of these |
| Answer» D. None of these | |
| 8287. |
Which of the following statements is incorrect [CPMT 1985] |
| A. | Enzymes are in colloidal state |
| B. | Enzymes are catalysts |
| C. | Enzymes can catalyse any reaction |
| D. | Urease is an enzyme |
| Answer» D. Urease is an enzyme | |
| 8288. |
\[{{F}_{2}}C=C{{F}_{2}}\] is the monomer of [CBSE PMT 2000] |
| A. | Nylon-6 |
| B. | Buna-S |
| C. | Glyptal |
| D. | Teflon |
| Answer» E. | |
| 8289. |
In the 'glycolipids', the two sugars known to occur are glucose and |
| A. | Fructose |
| B. | Lactose |
| C. | Galactose |
| D. | Sucrose |
| Answer» D. Sucrose | |
| 8290. |
If 1.2 g of metal displace 1.12 litre hydrogen at normal temperature and pressure, equivalent weight of metal would be [DPMT 2001] |
| A. | 24 |
| B. | 12 |
| C. | 1.2 ¸11.2 |
| D. | 1.2 - 11.2 |
| Answer» B. 12 | |
| 8291. |
Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to [AIEEE 2004] |
| A. | A change in the partial pressure of oxygen in the air |
| B. | A change in the crystalline structure of tin |
| C. | An interaction with nitrogen of the air at very low to temperatures |
| D. | An interaction with water vapour contained in the humid air |
| Answer» C. An interaction with nitrogen of the air at very low to temperatures | |
| 8292. |
What is the packet of energy called [AFMC 2005] |
| A. | Electron |
| B. | Photon |
| C. | Positron |
| D. | Proton |
| Answer» C. Positron | |
| 8293. |
Which of the following is an organometallic compound [AIIMS 1997] |
| A. | \[Ti{{\left( {{C}_{2}}{{H}_{5}} \right)}_{4}}\] |
| B. | \[Ti{{(O{{C}_{2}}{{H}_{5}})}_{4}}\] |
| C. | \[Ti{{\left( OCOC{{H}_{3}} \right)}_{4}}\] |
| D. | \[Ti{{(O{{C}_{6}}{{H}_{5}})}_{4}}\] |
| Answer» B. \[Ti{{(O{{C}_{2}}{{H}_{5}})}_{4}}\] | |
| 8294. |
The compound in which cation is isoelectronic with anion is [UPSEAT 2004] |
| A. | \[NaCl\] |
| B. | \[CsF\] |
| C. | \[NaI\] |
| D. | \[{{K}_{2}}S\] |
| Answer» E. | |
| 8295. |
The radius of the nucleus is related to the mass number \[A\] by [EAMCET 1998] |
| A. | \[R={{R}_{o}}{{A}^{1/2}}\] |
| B. | \[R={{R}_{o}}A\] |
| C. | \[R={{R}_{o}}{{A}^{2}}\] |
| D. | \[R={{R}_{o}}{{A}^{1/3}}\] |
| Answer» E. | |
| 8296. |
?Lead pencil? contains [DPMT 2001; IIT 1990] |
| A. | \[PbS\] |
| B. | Graphite |
| C. | \[({{H}_{3}}B{{O}_{3}})\] |
| D. | \[Pb\] |
| Answer» C. \[({{H}_{3}}B{{O}_{3}})\] | |
| 8297. |
Which of the following is a non-metal [MP PMT 1999] |
| A. | Gallium |
| B. | Indium |
| C. | Boron |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 8298. |
Melmoware are |
| A. | Thermosetting |
| B. | Thermoplastic |
| C. | Both A and B |
| D. | None of these |
| Answer» B. Thermoplastic | |
| 8299. |
Tollen's reagent is [KCET 1990] |
| A. | \[{{\left[ Ag{{\left( N{{H}_{3}} \right)}_{2}} \right]}^{+}}\] |
| B. | \[A{{g}_{2}}O\] |
| C. | \[{{\left[ Cu{{\left( OH \right)}_{4}} \right]}^{2-}}\] |
| D. | \[C{{u}_{2}}O\] |
| Answer» B. \[A{{g}_{2}}O\] | |
| 8300. |
The conjugate acid of \[NH_{2}^{-}\]is [IIT 1985; Roorkee 1995; EAMCET 1997;CBSE PMT PMT 2000; MP PET 1996,2000] |
| A. | \[N{{H}_{3}}\] |
| B. | \[NH_{4}^{+}\] |
| C. | \[N{{H}_{2}}OH\] |
| D. | \[{{N}_{2}}{{H}_{4}}\] |
| Answer» B. \[NH_{4}^{+}\] | |