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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.
| 9201. |
Canesugar on hydrolysis gives [MADT Bihar 1984; NCERT 1977; AMU 1985] |
| A. | Glucose and maltose |
| B. | Glucose and lactose |
| C. | Glucose and fructose |
| D. | Only glucose |
| Answer» D. Only glucose | |
| 9202. |
Which silver halide is used in medicine [DPMT 1996] |
| A. | \[AgN{{O}_{3}}\] |
| B. | \[AgCl\] |
| C. | \[AgBr\] |
| D. | \[AgF\] |
| Answer» B. \[AgCl\] | |
| 9203. |
If the quantity of a radioactive element is doubled, then its rate of disintegration per unit time will be [NCERT 1972, 92; MP PET 1989] |
| A. | Unchanged |
| B. | Reduced to half |
| C. | Increased by \[\sqrt{2}\]times |
| D. | Doubled |
| Answer» E. | |
| 9204. |
A mixture of two completely miscible non-ideal liquids which distil as such without change in its composition at a constant temperature as though it were a pure liquid. This mixture is known as [CBSE PMT 1990] |
| A. | Binary liquid mixture |
| B. | Azeotropic mixture |
| C. | Eutectic mixture |
| D. | Ideal mixture |
| Answer» C. Eutectic mixture | |
| 9205. |
The negative ligand is |
| A. | Aqua |
| B. | Sulphato |
| C. | Carboxyl |
| D. | Nitro sodium |
| Answer» C. Carboxyl | |
| 9206. |
In alkene (ethene) number of \[s{{p}^{2}}\] hybrid carbon atoms are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 9207. |
Positronium consists of an electron and a positron (a particle which has the same mass as an electron, but opposite charge) orbiting round their common centre of mass. Calculate the value of the Rydberg constant for this system. |
| A. | \[{{R}_{\infty }}/4\] |
| B. | \[{{R}_{\infty }}/2\] |
| C. | \[2{{R}_{\infty }}\] |
| D. | \[{{R}_{\infty }}\] |
| Answer» C. \[2{{R}_{\infty }}\] | |
| 9208. |
IUPAC name of the compound \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}{{(C{{H}_{3}})}_{2}}-C-C{{H}_{3}}\] [RPET 2000] |
| A. | 1, 1-dimethyl pentane |
| B. | 2, 2-dimethyl pentane |
| C. | 1, 2-dimethyl pentane |
| D. | None of these |
| Answer» C. 1, 2-dimethyl pentane | |
| 9209. |
IUPAC name of the following are \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{N\,-\,}}\,}}\,\underset{{{C}_{2}}{{H}_{5}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,}{\mathop{C\,\,\,-}}}\,}}}\,C{{H}_{2}}-C{{H}_{3}}\] [DCE 2000] |
| A. | 3-dimethylamino-3-methyl pentane |
| B. | 3 (N, N-Trimethyl)-3-aminopentane |
| C. | 3, (N, N-Trimethyl) pentanammine |
| D. | 3-N, N dimethyl amino-3- methyl pentane |
| Answer» E. | |
| 9210. |
A gaseous mixture contains \[C{{H}_{4}}\]and \[{{C}_{2}}{{H}_{6}}\]in equimolecular proportion. The weight of 2.24 litres of this mixture at NTP is |
| A. | 4.6 g |
| B. | 1.6 g |
| C. | 2.3 g |
| D. | 23 g |
| Answer» D. 23 g | |
| 9211. |
If the \[Z{{n}^{2+}}/Zn\] electrode is diluted to 100 times then the change in e.m.f. [DPMT 2005] |
| A. | Increase of \[59\,mV\] |
| B. | Decrease of \[59\,mV\] |
| C. | Increase of \[29.5\,mV\] |
| D. | Decrease of \[29.5\,mV\] |
| Answer» B. Decrease of \[59\,mV\] | |
| 9212. |
Which of the following has highest octane number [MP PMT 2000] |
| A. | n-hexane |
| B. | n-heptane |
| C. | n-pentane |
| D. | 2, 2, 4-trimethyl pentane |
| Answer» E. | |
| 9213. |
The natural petroleum contains [MP PMT 1995] |
| A. | Saturated hydrocarbons |
| B. | Cyclic saturated hydrocarbons |
| C. | Compounds of sulphur |
| D. | All of these |
| Answer» E. | |
| 9214. |
Which one of the following salts gives aqueous solution which is weakly basic [Bihar CEE 1995] |
| A. | \[NaHC{{O}_{3}}\] |
| B. | \[NaHS{{O}_{4}}\] |
| C. | \[NaCl\] |
| D. | \[N{{H}_{4}}HC{{O}_{3}}\] |
| Answer» B. \[NaHS{{O}_{4}}\] | |
| 9215. |
The colour of hydrogen is [IIT 1980] |
| A. | Black |
| B. | Yellow |
| C. | Orange |
| D. | None of these |
| Answer» E. | |
| 9216. |
The process of industrial manufacturing of sodium carbonate is known as [CPMT 1978, 86; MP PMT 1995] |
| A. | Castner process |
| B. | Haber's process |
| C. | Le-blanc process |
| D. | Chamber process |
| Answer» D. Chamber process | |
| 9217. |
The IUPAC name of \[C{{H}_{3}}-\underset{OH}{\mathop{\underset{|\,\,\,\,}{\mathop{\overset{Cl}{\mathop{\overset{|}{\mathop{C}}\,}}\,-}}\,}}\,C{{H}_{2}}CH=CHC{{H}_{3}}\] is [DPMT 1996] |
| A. | 5-chloro-2-hydroxyhexene |
| B. | 2-chloro-5-hydroxyhexene |
| C. | 2-chloro-2-hydroxy-5-hexene |
| D. | 2-chloro-4-hexenol-2 |
| Answer» E. | |
| 9218. |
The IUPAC name of the following compound is \[\underset{CH{{(C{{H}_{3}})}_{2}}\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}-CH-C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}}}\,}}\,\] [Bihar CEE 1995] |
| A. | 2-isopropylpentane |
| B. | 2, 3-dimethylhexane |
| C. | Isononane |
| D. | 2, 4-dimethylhexane |
| Answer» C. Isononane | |
| 9219. |
An organic compound has a triple bond and not double bond. It can be tested by [MP PMT 2000, 03] |
| A. | Bromine water |
| B. | Bayer's reagent |
| C. | Fehling solution |
| D. | Ammonical silver nitrate |
| Answer» E. | |
| 9220. |
The name of \[{{H}_{3}}C-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-\underset{OH}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{3}}\] IUPAC nomenclature system is [MP PMT 2002; MH CET 2002] |
| A. | Butanol |
| B. | 2-methyl butanol-3 |
| C. | 3-methyl butanol-2 |
| D. | Pentanol |
| Answer» D. Pentanol | |
| 9221. |
Which of the following is an example of nuclear fission [Pb. CET 2002] |
| A. | \[_{1}{{H}^{2}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{2}}H{{e}^{4}}+\gamma \] |
| B. | \[A+B\to C+\]energy |
| C. | \[_{92}{{U}^{235}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{56}}B{{a}^{141}}+{{\,}_{36}}K{{r}^{92}}+3{{\,}_{0}}{{n}^{1}}+\]energy |
| D. | \[_{13}A{{l}^{27}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{15}}{{P}^{30}}+{{\,}_{0}}{{n}^{1}}\] |
| Answer» D. \[_{13}A{{l}^{27}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{15}}{{P}^{30}}+{{\,}_{0}}{{n}^{1}}\] | |
| 9222. |
Which of the following is the weakest acid [CPMT 2001] |
| A. | HF |
| B. | HCl |
| C. | HBr |
| D. | HI |
| Answer» B. HCl | |
| 9223. |
After the emission of \[\alpha \]-particle from the atom \[_{92}{{X}^{238}}\], the number of neutrons in the atom will be [MNR 1993; UPSEAT 1999, 2001, 02] |
| A. | 138 |
| B. | 140 |
| C. | 144 |
| D. | 150 |
| Answer» D. 150 | |
| 9224. |
Simplest alkyne is represented by [CPMT 1974] |
| A. | CH |
| B. | \[C{{H}_{2}}\] |
| C. | \[{{C}_{2}}{{H}_{2}}\] |
| D. | \[{{C}_{2}}{{H}_{4}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{4}}\] | |
| 9225. |
When \[Al\] is added to \[KOH\] solution [NCERT 1974, 76; CPMT 1977] |
| A. | No action takes place |
| B. | Oxygen is evolved |
| C. | Water is produced |
| D. | Hydrogen is evolved |
| Answer» E. | |
| 9226. |
When an radioactive element emits an alpha particle, the daughter element is placed in the periodic table [MP PET 1991; MADT Bihar 1981] |
| A. | Two positions to the left of the parent element |
| B. | Two positions to the right of the parent element |
| C. | One position to the right of the parent element |
| D. | In the same position as the parent element |
| Answer» B. Two positions to the right of the parent element | |
| 9227. |
A straight chain hydrocarbon has the molecular formula \[{{C}_{8}}{{H}_{10}}\]. The hybridisation for the carbon atoms from one end of the chain to the other are respectively \[s{{p}^{3}},\text{ }s{{p}^{2}},\text{ }s{{p}^{2}}\text{, }s{{p}^{3}},\text{ }s{{p}^{2}},\text{ }s{{p}^{2}},\text{ }sp\] and \[sp\]. The structural formula of the hydrocarbon would be [CBSE PMT 1992] |
| A. | \[C{{H}_{3}}-C\equiv C-C{{H}_{2}}-CH=CH-CH=C{{H}_{2}}\] |
| B. | \[C{{H}_{3}}-C{{H}_{2}}-CH=CH-C{{H}_{2}}-C\equiv C-CH=C{{H}_{2}}\] |
| C. | \[C{{H}_{3}}-CH=CH-C{{H}_{2}}-C\equiv C-CH=C{{H}_{2}}\] |
| D. | \[C{{H}_{3}}-CH=CH-C{{H}_{2}}-CH=CH-C\equiv CH\] |
| Answer» E. | |
| 9228. |
When \[\alpha \]-particles are sent through a thin metal foil, most of them go straight through the foil because (one or more are correct) [IIT 1984] |
| A. | Alpha particles are much heavier than electrons |
| B. | Alpha particles are positively charged |
| C. | Most part of the atom is empty space |
| D. | Alpha particles move with high velocity |
| Answer» D. Alpha particles move with high velocity | |
| 9229. |
Toluene has [MP PMT 2000; Kerala CET 2005] |
| A. | 6\[\sigma \]and 3 \[\pi \]bond |
| B. | 9 \[\sigma \]and 3\[\pi \]bond |
| C. | 9 \[\sigma \]and 6\[\pi \]bond |
| D. | 15\[\sigma \]and 3\[\pi \] bond |
| Answer» E. | |
| 9230. |
The method of zone refining of metals is based on the principle of [CBSE PMT 2003] |
| A. | Greater solubility of the impurity in the molten state than in the solid |
| B. | Greater mobility of the pure metal than that of the impurity |
| C. | Higher melting point of the impurity than that of the pure metal |
| D. | Greater noble character of the solid metal than that of the impurity |
| Answer» B. Greater mobility of the pure metal than that of the impurity | |
| 9231. |
In paraffins, with the increasing molecular weight, it is found that [CPMT 1974] |
| A. | Freezing point decreases |
| B. | Boiling point decreases |
| C. | Boiling point increases |
| D. | Vapour pressure decreases |
| Answer» D. Vapour pressure decreases | |
| 9232. |
The bond between carbon atom (1) and carbon atom (2) in compound \[N\equiv C-CH=C{{H}_{2}}\] involves the hybridised carbon as [IIT-JEE 1987; DCE 2000] |
| A. | \[s{{p}^{2}}\] and \[s{{p}^{2}}\] |
| B. | \[s{{p}^{3}}\] and \[sp\] |
| C. | \[sp\] and \[s{{p}^{2}}\] |
| D. | \[sp\] and \[sp\] |
| Answer» D. \[sp\] and \[sp\] | |
| 9233. |
The first ionization energy for Li is 5.4 eV and electron affinity of Cl is 3.61eV. The \[\Delta H\] (in kJ/mol) for the reaction \[Li(g)+Cl(g)\to L{{i}^{+}}+C{{l}^{-}}\] is (if resulting ions do not combine with each other) \[(1\,eV=1.6\times {{10}^{-19}}J)\] [MP PMT 2000, 03] |
| A. | 70 |
| B. | 100 |
| C. | 170 |
| D. | 270 |
| Answer» D. 270 | |
| 9234. |
Which of the following statements are true for an fuel cells [DPMT 2004] |
| A. | They run till the reactants are active |
| B. | They are free from pollution |
| C. | They are more efficient |
| D. | All of the above |
| Answer» E. | |
| 9235. |
The ionisation potential of a hydrogen atom is ?13.6 eV. What will be the energy of the atom corresponding to \[n=2\] [Pb. CET 2000] |
| A. | ?3.4 eV |
| B. | ?6.8 eV |
| C. | ?1.7 eV |
| D. | ? 2.7 eV |
| Answer» B. ?6.8 eV | |
| 9236. |
Electrophile in the case of chlorination of benzene in the presence of \[FeC{{l}_{3}}\] is [CBSE PMT 1996] |
| A. | \[C{{l}^{+}}\] |
| B. | \[C{{l}^{-}}\] |
| C. | Cl |
| D. | \[FeC{{l}_{3}}\] |
| Answer» B. \[C{{l}^{-}}\] | |
| 9237. |
Addition of HCl does not obey antimarkownikoff?s rule because [UPSEAT 2003] |
| A. | It is a strong acid |
| B. | It is a gas |
| C. | Its bond energy is high |
| D. | Its bond energy is less |
| Answer» D. Its bond energy is less | |
| 9238. |
The product formed when toluene is heated in light with \[C{{l}_{2}}\] and in absence of halogen carrier is |
| A. | Benzotrichloride |
| B. | Gammexene |
| C. | Chlorobenzene |
| D. | None of these |
| Answer» B. Gammexene | |
| 9239. |
Which has the minimum freezing point [CPMT 1991] |
| A. | One molal \[NaCl\] solution |
| B. | One molal \[KCl\] solution |
| C. | One molal \[CaC{{l}_{2}}\] solution |
| D. | One molal urea solution |
| Answer» D. One molal urea solution | |
| 9240. |
Which of the following salts is insoluble in water at room temperature but soluble in boiling water [MP PMT 1993] |
| A. | \[CaC{{l}_{2}}\] |
| B. | \[BaC{{l}_{2}}\] |
| C. | \[SrC{{l}_{2}}\] |
| D. | \[PbC{{l}_{2}}\] |
| Answer» E. | |
| 9241. |
The outer electronic configuration of alkaline earth metal is [BHU 1980; CPMT 1985, 93; MP PAT 1993] |
| A. | \[n{{s}^{2}}\] |
| B. | \[n{{s}^{1}}\] |
| C. | \[n{{p}^{6}}\] |
| D. | \[n{{d}^{10}}\] |
| Answer» B. \[n{{s}^{1}}\] | |
| 9242. |
Which of the following metal carbonate is decomposed on heating [MNR 1985; MP PET 1994; Pb. CET 2004] |
| A. | \[MgC{{O}_{3}}\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}\] |
| C. | \[{{K}_{2}}C{{O}_{3}}\] |
| D. | \[R{{b}_{2}}C{{O}_{3}}\] |
| Answer» B. \[N{{a}_{2}}C{{O}_{3}}\] | |
| 9243. |
In Friedel Craft?s alkylation, besides \[AlC{{l}_{3}}\] the other reactants are [AFMC 1997; CBSE PMT 1999] |
| A. | \[{{C}_{6}}{{H}_{6}}+C{{H}_{3}}Cl\] |
| B. | \[{{C}_{6}}{{H}_{6}}+C{{H}_{4}}\] |
| C. | \[{{C}_{6}}{{H}_{6}}+N{{H}_{3}}\] |
| D. | \[{{C}_{6}}{{H}_{6}}+C{{H}_{3}}COCl\] |
| Answer» B. \[{{C}_{6}}{{H}_{6}}+C{{H}_{4}}\] | |
| 9244. |
\[FeS{{O}_{4}}.7{{H}_{2}}O\] shows isomorphism with [BVP 2004] |
| A. | \[ZnS{{O}_{4}}.7{{H}_{2}}O\] |
| B. | \[MnS{{O}_{4}}.4{{H}_{2}}O\] |
| C. | \[CaS{{O}_{4}}.5{{H}_{2}}O\] |
| D. | \[CaC{{l}_{2}}.2{{H}_{2}}O\] |
| Answer» B. \[MnS{{O}_{4}}.4{{H}_{2}}O\] | |
| 9245. |
Which metal is electro-deposited on iron surface to prevent rusting [MP PET 1990] |
| A. | \[Cu\] |
| B. | \[Zn\] |
| C. | \[Mg\] |
| D. | \[Pb\] |
| Answer» C. \[Mg\] | |
| 9246. |
Which of the following is property of colloid [CPMT 1996] |
| A. | Scattering of light |
| B. | They show attraction |
| C. | Dialysis |
| D. | Emulsion |
| Answer» B. They show attraction | |
| 9247. |
Which one has larger radius [CPMT 1997; KCET 2005] |
| A. | \[N{{a}^{+}}\] |
| B. | \[F\] |
| C. | \[{{F}^{-}}\] |
| D. | \[Na\] |
| Answer» E. | |
| 9248. |
Silver nitrate produces a black stain on skin due to |
| A. | Being a strong reducing agent |
| B. | Its corrosive action |
| C. | Formation of complex compound |
| D. | Its reduction to metallic silver |
| Answer» E. | |
| 9249. |
Bredig arc method can not be used to prepare colloidal solution of which of the following [AFMC 2004] |
| A. | Pt |
| B. | Fe |
| C. | Ag |
| D. | Au |
| Answer» C. Ag | |
| 9250. |
Mohr's salt is a [MNR 1986] |
| A. | Normal salt |
| B. | Acid salt |
| C. | Basic salt |
| D. | Double salt |
| Answer» E. | |