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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.
| 2951. |
At low concentrations, the statement that equimolal solutions under a given set of experimental conditions have equal osmotic pressure is true for [EAMCET 1979; BHU 1979] |
| A. | All solutions |
| B. | Solutions of non-electrolytes only |
| C. | Solutions of electrolytes only |
| D. | None of these |
| Answer» C. Solutions of electrolytes only | |
| 2952. |
The value of osmotic pressure of a 0.2 M aqueous solution at 293K is [AMU 2002] |
| A. | 8.4 atm |
| B. | 0.48atm |
| C. | 4.8 atm |
| D. | 4.0 atm |
| Answer» D. 4.0 atm | |
| 2953. |
A 0.6% solution of urea (molecular weight = 60) would be isotonic with [NCERT 1982; DCE 2002] |
| A. | \[0.1M\] glucose |
| B. | \[0.1M\,KCl\] |
| C. | 0.6% glucose solution |
| D. | \[0.6%\,\,KCl\] solution |
| Answer» B. \[0.1M\,KCl\] | |
| 2954. |
Isotonic solution have the same [EAMCET 1979; JIPMER 1991, 2002; AFMC 1995; MP PMT 2002] |
| A. | Density |
| B. | Molar concentration |
| C. | Normality |
| D. | None of these |
| Answer» C. Normality | |
| 2955. |
Osmotic pressure is 0.0821 atm at temperature of \[300\,K\]. Find concentration in mole/litre [Roorkee 1990] |
| A. | 0.033 |
| B. | 0.066 |
| C. | \[0.33\times {{10}^{-2}}\] |
| D. | 3 |
| Answer» D. 3 | |
| 2956. |
Which of the following associated with isotonic solutions is not correct [AMU 2002] |
| A. | They will have the same osmotic pressure |
| B. | They have the same weight concentrations |
| C. | Osmosis does not take place when the two solutions are separated by a semipermeable membrane |
| D. | They will have the same vapour pressure |
| Answer» C. Osmosis does not take place when the two solutions are separated by a semipermeable membrane | |
| 2957. |
Isotonic solutions have [DPMT 1984; MP PMT 1986] |
| A. | Equal temperature |
| B. | Equal osmotic pressure |
| C. | Equal volume |
| D. | Equal amount of solute |
| Answer» C. Equal volume | |
| 2958. |
Which statement is wrong regarding osmotic pressure (P), volume (V) and temperature (T) [MP PMT 1985] |
| A. | \[P\propto \frac{1}{V}\] if \[T\] is constant |
| B. | \[P\propto T\] if \[V\] is constant |
| C. | \[P\propto V\] if \[T\] is constant |
| D. | \[PV\]is constant if \[T\] is constant |
| Answer» D. \[PV\]is constant if \[T\] is constant | |
| 2959. |
The osmotic pressure of a dilute solution is given by [MP PMT 1987] |
| A. | \[P={{P}_{o}}x\] |
| B. | \[\pi V=nRT\] |
| C. | \[\Delta P={{P}_{o}}{{N}_{2}}\] |
| D. | \[\frac{\Delta P}{{{P}_{o}}}=\frac{{{P}_{o}}-P}{{{P}_{o}}}\] |
| Answer» C. \[\Delta P={{P}_{o}}{{N}_{2}}\] | |
| 2960. |
What would happen if a thin slice of sugar beet is placed in a concentrated solution of \[NaCl\] [CMC Vellore 1986] |
| A. | Sugar beet will lose water from its cells |
| B. | Sugar beet will absorb water from solution |
| C. | Sugar beet will neither absorb nor lose water |
| D. | Sugar beet will dissolve in solution |
| Answer» B. Sugar beet will absorb water from solution | |
| 2961. |
The osmotic pressure of a solution is directly proportional to |
| A. | The molecular concentration of solute |
| B. | The absolute temperature at a given concentration |
| C. | The lowering of vapour pressure |
| D. | All of the above |
| Answer» E. | |
| 2962. |
The osmotic pressure of a solution is given by the relation [CPMT 1983, 84, 87, 93, 94] |
| A. | \[P=\frac{RT}{C}\] |
| B. | \[P=\frac{CT}{R}\] |
| C. | \[P=\frac{RC}{T}\] |
| D. | \[\frac{P}{C}=RT\] |
| Answer» E. | |
| 2963. |
The solution in which the blood cells retain their normal form are with regard to the blood [CBSE PMT 1991] |
| A. | Isotonic |
| B. | Isomotic |
| C. | Hypertonic |
| D. | Equinormal |
| Answer» B. Isomotic | |
| 2964. |
Osmotic pressure of a solution can be measured quickly and accurately by [JIPMER 1991; CPMT 1983] |
| A. | Berkeley and Hartley's method |
| B. | Morse's method |
| C. | Pfeffer's method |
| D. | De Vries method |
| Answer» B. Morse's method | |
| 2965. |
The osmotic pressure of \[1\,m\] solution at \[{{27}^{o}}C\] is [CPMT 1999] |
| A. | 2.46 atm |
| B. | 24.6 atm |
| C. | 1.21 atm |
| D. | 12.1 atm |
| Answer» C. 1.21 atm | |
| 2966. |
Which inorganic precipitate acts as semipermeable membrane or The chemical composition of semipermeable membrane is [CPMT 1984, 90; MP PMT 1985, 86] |
| A. | Calcium sulphate |
| B. | Barium oxalate |
| C. | Nickel phosphate |
| D. | Copper ferrocyanide |
| Answer» E. | |
| 2967. |
Blood is isotonic with [DCE 2000] |
| A. | 0.16 M \[NaCl\] |
| B. | Conc. \[NaCl\] |
| C. | 50 % \[NaCl\] |
| D. | 30 % \[NaCl\] |
| Answer» B. Conc. \[NaCl\] | |
| 2968. |
The osmotic pressure of 0.4% urea solution is 1.66 atm and. that of a solution of suger of 3.42 % is 2.46 atm. When both the solution are mixed then the osmotic pressure of the resultant solution will be [MP PMT 1985] |
| A. | 1.64 atm |
| B. | 2.46 atm |
| C. | 2.06 atm |
| D. | 0.82 atm |
| Answer» D. 0.82 atm | |
| 2969. |
If 20 g of a solute was dissolved in 500 ml of water and osmotic pressure of the solution was found to be 600 mm of Hg at \[{{15}^{o}}C,\] then molecular weight of the solute is [BHU 2004] |
| A. | 1000 |
| B. | 1200 |
| C. | 1400 |
| D. | 1800 |
| Answer» C. 1400 | |
| 2970. |
A solution of sucrose(molar mass = 342 g/mol) is prepared by dissolving 68.4 g of it per litre of the solution, what is its osmotic pressure (R = 0.082 lit. atm.\[{{k}^{-1}}\]\[mo{{l}^{-1}}\]) at 273k [UPSEAT 2001] |
| A. | 6.02 atm |
| B. | 4.92 atm |
| C. | 4.04 atm |
| D. | 5.32 atm |
| Answer» C. 4.04 atm | |
| 2971. |
Blood has been found to be isotonic with [CPMT 1994] |
| A. | Normal saline solution |
| B. | Saturated \[NaCl\]solution |
| C. | Saturated \[KCl\] solution |
| D. | Saturated solution of a 1 : 1 mixture of \[NaCl\] and \[KCl\] |
| Answer» B. Saturated \[NaCl\]solution | |
| 2972. |
The average osmotic pressure of human blood is 7.8 bar at \[{{37}^{o}}C\]. What is the concentration of an aqueous \[NaCl\] solution that could be used in the blood stream [AIIMS 2004] |
| A. | \[0.16\,\,mol/L\] |
| B. | \[0.32\,\,mol/L\] |
| C. | \[0.60\,\,mol/L\] |
| D. | \[0.45\,\,mol/L\] |
| Answer» C. \[0.60\,\,mol/L\] | |
| 2973. |
Which of the following colligative properties can provide molar mass of proteins (or polymers or colloids) with greater precision [Kerala PMT 2004] |
| A. | Relative lowering of vapour pressure |
| B. | Elevation of boiling point |
| C. | Depression in freezing point |
| D. | Osmotic pressure |
| E. | Rast's method |
| Answer» E. Rast's method | |
| 2974. |
A 5% solution of canesugar (mol. wt. =342) is isotonic with 1% solution of a substance \[X\]. The molecular weight of \[X\] is [CBSE PMT 1998] |
| A. | 34.2 |
| B. | 171.2 |
| C. | 68.4 |
| D. | 136.8 |
| Answer» D. 136.8 | |
| 2975. |
If 3 gm of glucose (mol. wt. 180) is dissolved in 60 gm of water at \[{{15}^{o}}C\]. Then the osmotic pressure of this solution will be [MP PMT 1986] |
| A. | 0.34 atm |
| B. | 0.65 atm |
| C. | 6.57 atm |
| D. | 5.57 atm |
| Answer» D. 5.57 atm | |
| 2976. |
Two solutions A and B are separated by semi- permeable membrane. If liquid flows form A to B then [MH CET 2000] |
| A. | A is less concentrated than B |
| B. | A is more concentrated than B |
| C. | Both have same concentration |
| D. | None of these |
| Answer» B. A is more concentrated than B | |
| 2977. |
In electrophilic substitution reaction nitrobenzene is [Kerala (Med.) 2003] |
| A. | Meta-directing |
| B. | Ortho-directing |
| C. | Para-directing |
| D. | Not reactive and does not undergo any substitution |
| E. | Non-selective |
| Answer» D. Not reactive and does not undergo any substitution | |
| 2978. |
\[{{H}_{3}}C-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,}{\mathop{C\,\,-\,}}}\,}}}\,Br+KOH(Aq.)\to {{H}_{3}}C-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,}{\mathop{C\,\,-\,}}}\,}}}\,OH+KBr\] above reaction is [RPMT 2003] |
| A. | \[S{{N}^{1}}\] |
| B. | \[S{{N}^{2}}\] |
| C. | \[{{E}_{1}}\] |
| D. | Both A and B |
| Answer» B. \[S{{N}^{2}}\] | |
| 2979. |
Which of the following alkyl groups has the maximum + I effect [KCET 2002] |
| A. | \[C{{H}_{3}}-\] |
| B. | \[{{(C{{H}_{3}})}_{2}}CH-\] |
| C. | \[{{(C{{H}_{3}})}_{3}}C-\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}-\] |
| Answer» D. \[C{{H}_{3}}C{{H}_{2}}-\] | |
| 2980. |
Which of the following cannot undergo nucleophilic substitution under ordinary conditions [J & K 2005] |
| A. | Chlorobenzene |
| B. | tert-butylchloride |
| C. | Isopropyl chloride |
| D. | None of these |
| Answer» E. | |
| 2981. |
Geometry of reaction intermediate in \[S{{N}^{1}}\] reaction is [MH CET 2001] |
| A. | Tetrahedral |
| B. | Planar |
| C. | Triangular bipyramidal |
| D. | None of these |
| Answer» C. Triangular bipyramidal | |
| 2982. |
Bromination of alkanes involves [J & K 2005] |
| A. | Carbanions |
| B. | Carbocations |
| C. | Carbenes |
| D. | Free radicals |
| Answer» E. | |
| 2983. |
Which of the following applies in the reaction, \[C{{H}_{3}}CHBrC{{H}_{2}}C{{H}_{3}}\xrightarrow{alc.\,KOH}\] (i) \[C{{H}_{3}}CH=CHC{{H}_{3}}\] (major product) (ii) \[C{{H}_{2}}=CHC{{H}_{2}}C{{H}_{3}}\] (minor product) [Orissa JEE 2005] |
| A. | Markovnikov's rule |
| B. | Saytzeff's rule |
| C. | Kharasch effect |
| D. | Hofmann's rule |
| Answer» C. Kharasch effect | |
| 2984. |
What is the decreasing order of reactivity amongst the following compounds towards aromatic electrophilic substitution [IIT-JEE 1995] I. Chlorobenzene II. Benzene III. Anilinium chloride IV. Toluene |
| A. | \[I>II>III>IV\] |
| B. | \[IV>II>I>III\] |
| C. | \[II>I>III>IV\] |
| D. | \[III>I>II>IV\] |
| Answer» C. \[II>I>III>IV\] | |
| 2985. |
Examine the following statements pertaining to an \[S{{N}^{2}}\] reaction (1) The rate of reaction is independent of the concentration of the nucleophile (2) The nucleophile attacks the \[{{C}^{-}}\] atom on the side of the molecule opposite to the group being displaced (3) The reaction proceeds with simultaneous bond formation and bond rupture/cleavage Amongst the following which of the above were true [NCERT 1982] |
| A. | 1, 2 |
| B. | 1, 3 |
| C. | 1, 2, 3 |
| D. | 2, 3 |
| Answer» E. | |
| 2986. |
Elimination of bromine from 2-bromobutane results in the formation of [AIEEE 2004, 05] |
| A. | Equimolar mixture of 1 and 2-butene |
| B. | Predominantly 2-butene |
| C. | Predominantly 1-butene |
| D. | Predominantly 2-butyne |
| Answer» C. Predominantly 1-butene | |
| 2987. |
The reaction [AIEEE 2005] , is fastest when \[X\] is |
| A. | \[Cl\] |
| B. | \[N{{H}_{2}}\] |
| C. | \[O{{C}_{2}}{{H}_{5}}\] |
| D. | \[OCOR\] |
| Answer» B. \[N{{H}_{2}}\] | |
| 2988. |
Strongest nucleophile is [BHU 2003] |
| A. | \[RN{{H}_{2}}\] |
| B. | \[ROH\] |
| C. | \[{{C}_{6}}{{H}_{5}}{{O}^{-}}\] |
| D. | \[C{{H}_{3}}{{O}^{-}}\] |
| Answer» E. | |
| 2989. |
The above reaction proceeds through [AMU 2000] |
| A. | Nucleophilic substitution |
| B. | Electrophilic substitution |
| C. | Free radical substitution |
| D. | More than one of the above processes |
| Answer» D. More than one of the above processes | |
| 2990. |
Which is an electrophile [DCE 2000] |
| A. | \[AlC{{l}_{3}}\] |
| B. | \[C{{N}^{-}}\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[C{{H}_{3}}OH\] |
| Answer» B. \[C{{N}^{-}}\] | |
| 2991. |
Which represents nucleophilic aromatic substitution reaction [Orissa JEE 2004] |
| A. | Reaction of benzene with \[C{{l}_{2}}\] in sunlight |
| B. | Benzyl bromide hydrolysis |
| C. | Reaction of NaOH with dinitrofluorobenzene |
| D. | Sulphonation of benzene |
| Answer» C. Reaction of NaOH with dinitrofluorobenzene | |
| 2992. |
The following compound will undergo electrophilic substitution more readily than benzene [UPSEAT 2004] |
| A. | Nitrobenzene |
| B. | Benzoic acid |
| C. | Benzaldehyde |
| D. | Phenol |
| Answer» E. | |
| 2993. |
The electrophile in the nitration of benzene is [Orissa JEE 2004] |
| A. | \[NO_{2}^{+}\] |
| B. | \[N{{O}_{2}}\] |
| C. | \[N{{O}^{+}}\] |
| D. | \[NO_{2}^{-}\] |
| Answer» B. \[N{{O}_{2}}\] | |
| 2994. |
Formation of ethylene from acetylene is an example of |
| A. | Elimination reaction |
| B. | Substitution reaction |
| C. | Addition reaction |
| D. | Condensation reaction |
| Answer» D. Condensation reaction | |
| 2995. |
Addition of HCl to vinyl chloride gives 1, 1-dichloroethane because of [MP PET 2004] |
| A. | Mesomeric effect of Cl |
| B. | Inductive effect of Cl |
| C. | Restricted rotation around double bond |
| D. | None of these |
| Answer» E. | |
| 2996. |
Dehydrohalogenation of an alkyl halide is a/an [MH CET 2004] |
| A. | Nucleophilic substitution reaction |
| B. | Elimination reaction |
| C. | Both nucleophilic substitution and elimination reaction |
| D. | Rearrangement |
| Answer» C. Both nucleophilic substitution and elimination reaction | |
| 2997. |
The nitration of a compound is due to the [Pb. PMT 2004] |
| A. | \[N{{O}_{2}}\] |
| B. | \[N{{O}_{3}}\] |
| C. | NO |
| D. | \[NO_{2}^{+}\] |
| Answer» E. | |
| 2998. |
An alkyl halide may be converted into an alcohol by [Pb. PMT 2000] |
| A. | Elimination |
| B. | Addition |
| C. | Substitution |
| D. | Dehydrohalogenation |
| Answer» D. Dehydrohalogenation | |
| 2999. |
To which of the following four types does this reaction belong \[{{B}^{-}}+R-A\to B-R+{{A}^{-}}\] [Manipal MEE 1995] |
| A. | Unimolecular electrophilic substitution |
| B. | Bimolecular electrophilic substitution |
| C. | Unimolecular nucleophilic substitution |
| D. | Bimolecular nucleophilic substitution |
| Answer» E. | |
| 3000. |
The highest quantity present in the atmosphere is of [NCERT 1971, 79; CPMT 1972] |
| A. | Oxygen |
| B. | Hydrogen |
| C. | Nitrogen |
| D. | Ozone |
| Answer» D. Ozone | |