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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.
| 7851. |
If the dispersed phase is a liquid and the dispersion medium is a solid, the colloid is known as [NCERT 1981; CBSE PMT 1989; KCET 1998] |
| A. | A sol |
| B. | An emulsion |
| C. | A gel |
| D. | A foam |
| Answer» D. A foam | |
| 7852. |
Volume occupied by a gas at one atmospheric pressure and \[{{0}^{o}}C\] is V mL. Its volume at 273 K will be [Bihar MADT 1982] |
| A. | V ml |
| B. | V/2 ml |
| C. | 2 V |
| D. | None of these |
| Answer» B. V/2 ml | |
| 7853. |
Brownian motion is due to [MNR 1987; CPMT 1987; UPSEAT 2001, 02] |
| A. | Temperature fluctuation within the liquid phase |
| B. | Attraction and repulsion between charge on the colloidal |
| C. | Impact of molecules of the dispersion medium on the colloidal particles |
| D. | Convective currents |
| Answer» D. Convective currents | |
| 7854. |
What is the normality of a 1 M solution of \[{{H}_{3}}P{{O}_{4}}\] [AIIMS 1982] |
| A. | 0.5 N |
| B. | 1.0 N |
| C. | 2.0 N |
| D. | 3.0 N |
| Answer» E. | |
| 7855. |
The correct order of magnetic moments (spin only values in B.M.) among is [AIEEE 2004] |
| A. | \[{{[Fe{{(CN)}_{6}}]}^{4-}}>{{[MnC{{l}_{4}}]}^{2-}}>{{[CoC{{l}_{4}}]}^{2-}}\] |
| B. | \[{{[MnC{{l}_{4}}]}^{2-}}>{{[Fe{{(CN)}_{6}}]}^{4-}}>{{[CoC{{l}_{4}}]}^{2-}}\] |
| C. | \[{{[MnC{{l}_{4}}]}^{2-}}>{{[CoC{{l}_{4}}]}^{2-}}>{{[Fe{{(CN)}_{6}}]}^{4-}}\] |
| D. | \[{{[Fe{{(CN)}_{6}}]}^{4-}}>{{[CoC{{l}_{4}}]}^{2-}}>{{[MnC{{l}_{4}}]}^{2-}}\] (Atomic nos. \[Mn=25,\,Fe=26,\,Co=27\]) |
| Answer» D. \[{{[Fe{{(CN)}_{6}}]}^{4-}}>{{[CoC{{l}_{4}}]}^{2-}}>{{[MnC{{l}_{4}}]}^{2-}}\] (Atomic nos. \[Mn=25,\,Fe=26,\,Co=27\]) | |
| 7856. |
Alkene \[R-C-H=C{{H}_{2}}\] reacts readily with \[{{B}_{2}}{{H}_{56}}\] and the product on oxidation with alkaline hydrogen peroxides produces [CBSE PMT 1995] |
| A. | \[R-C{{H}_{2}}-CHO\] |
| B. | \[R-C{{H}_{2}}-C{{H}_{2}}-OH\] |
| C. | \[\underset{O}{\mathop{\underset{||}{\mathop{R-C-C{{H}_{3}}}}\,}}\,\] |
| D. | \[\underset{\,\,\,\,\,\,OH\,\,\,\,OH}{\mathop{\underset{\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}{\mathop{R-CH-C{{H}_{3}}}}\,}}\,\] |
| Answer» C. \[\underset{O}{\mathop{\underset{||}{\mathop{R-C-C{{H}_{3}}}}\,}}\,\] | |
| 7857. |
Which metal is present in brass, bronze and German silver [CPMT 1997; AFMC 1998; AIIMS 1999; J & K 2005] |
| A. | \[Zn\] |
| B. | \[Mg\] |
| C. | \[Cu\] |
| D. | \[Al\] |
| Answer» D. \[Al\] | |
| 7858. |
The unit of cell constant is [MP PET 1996] |
| A. | \[oh{{m}^{-1}}\,c{{m}^{-1}}\] |
| B. | \[ohm\,cm\] |
| C. | \[cm\] |
| D. | \[c{{m}^{-1}}\] |
| Answer» E. | |
| 7859. |
Natural rubber is a [MP PMT 1994] |
| A. | Polyester |
| B. | Polyamide |
| C. | Polyisoprene |
| D. | Polysaccharide |
| Answer» D. Polysaccharide | |
| 7860. |
A catalyst remains unchanged at the end of the reaction regarding [MP PET 1995] |
| A. | Mass |
| B. | Physical state |
| C. | Physical state and chemical composition |
| D. | Mass and chemical composition |
| Answer» E. | |
| 7861. |
The compound used as an explosive is [Kerala (Engg.) 2002; MP PET 2002; MP PMT 1993] |
| A. | 2,4, 6-tribromoaniline |
| B. | 1,3, 5-trinitrobenzene |
| C. | 2,4, 6-trichlorotoluene |
| D. | 1,3, 5-trichlorobenzene |
| E. | 2,4, 6-trinitrotoluene |
| Answer» F. | |
| 7862. |
Iron pipes lying under acidic soil are often attached to blocks of magnesium for protection from rusting. Magnesium offers protection to iron against corrosion because it [KCET 1998] |
| A. | Is more readily converted into positive ions |
| B. | Is lighter than iron |
| C. | Forms a corrosion-resistant alloy with iron |
| D. | Prevents air from reaching the surface of iron |
| Answer» B. Is lighter than iron | |
| 7863. |
In a hydrogen ? oxygen fuel cell, combustion of hydrogen occurs to [AIEEE 2004] |
| A. | Produce high purity water |
| B. | Create potential difference between the two electrodes |
| C. | Generate heat |
| D. | Remove adsorbed oxygen from electrode surfaces |
| Answer» C. Generate heat | |
| 7864. |
The solubility of \[CaC{{O}_{3}}\]in water is \[3.05\times {{10}^{-4}}moles/litre.\] Its solubility product will be [MP PMT 1997] |
| A. | \[3.05\times {{10}^{-4}}\] |
| B. | 10 |
| C. | \[6.1\times {{10}^{-4}}\] |
| D. | \[9.3\times {{10}^{-8}}\] |
| Answer» E. | |
| 7865. |
Which reagent can be used to identify nickel ion |
| A. | Resorcinol |
| B. | Dimethyl glyoxime [DMG] |
| C. | Diphenyl benzidine |
| D. | Potassium ferrocyanide |
| Answer» C. Diphenyl benzidine | |
| 7866. |
If uranium (mass no. 238 and atomic no. 92) emits \[\alpha \]-particle, the product has mass number and atomic number [CPMT 1984, 90, 93, 94; MNR 1991; IIT 1981] |
| A. | 234, 90 |
| B. | 236, 92 |
| C. | 238, 90 |
| D. | 236, 90 |
| Answer» B. 236, 92 | |
| 7867. |
Six carbon atoms of benzene are of |
| A. | One type |
| B. | Two types |
| C. | Three types |
| D. | Six types |
| Answer» B. Two types | |
| 7868. |
To protect iron against corrosion, the most durable metal plating on it, is [CBSE PMT 1994] |
| A. | Nickel plating |
| B. | Tin plating |
| C. | Copper plating |
| D. | Zinc plating |
| Answer» E. | |
| 7869. |
The difference between a lyophilic and lyophobic colloid is in their |
| A. | Particle size |
| B. | Behaviour towards dispersion medium |
| C. | Filtrability |
| D. | None of these |
| Answer» C. Filtrability | |
| 7870. |
The primary valence of the metal ion in the co-ordination compound \[{{K}_{2}}\left[ Ni{{\left( CN \right)}_{4}} \right]\] is |
| A. | Four |
| B. | Zero |
| C. | Two |
| D. | Six |
| Answer» D. Six | |
| 7871. |
All the nuclei from the initial element to the final element constitute a series which is called [Kerala (Med.) 2002] |
| A. | g-series |
| B. | b-series |
| C. | b-g series |
| D. | Disintegration series |
| Answer» E. | |
| 7872. |
Which one of the following substances will be a mixed salt [DPMT 1982; CPMT 1972] |
| A. | \[NaHC{{O}_{3}}\] |
| B. | \[Ca(OCl)Cl\] |
| C. | \[{{K}_{2}}S{{O}_{4}}\,A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] |
| D. | \[Mg\,(OH)Br\] |
| Answer» C. \[{{K}_{2}}S{{O}_{4}}\,A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] | |
| 7873. |
Which one of the following is not a colloidal solution [MADT Bihar 1983] |
| A. | Smoke |
| B. | Ink |
| C. | Air |
| D. | Blood |
| Answer» D. Blood | |
| 7874. |
Which of these will not react with acetylene [AIEEE 2002; DCE 2002] |
| A. | NaOH |
| B. | Ammonical \[AgN{{O}_{3}}\] |
| C. | Na |
| D. | HCl |
| Answer» B. Ammonical \[AgN{{O}_{3}}\] | |
| 7875. |
What is freon-12 [RPET 1999] |
| A. | Pesticide |
| B. | Refrigerant |
| C. | Solvent |
| D. | Lubricant |
| Answer» C. Solvent | |
| 7876. |
Prevention of corrosion of iron by zinc coating is called [MP PMT 1993; CPMT 2002] |
| A. | Galvanization |
| B. | Cathodic protection |
| C. | Electrolysis |
| D. | Photo?electrolysis |
| Answer» B. Cathodic protection | |
| 7877. |
Which one of the following compounds cannot be prepared by Wurtz reaction [Kurukshetra CEE 2002; MP PMT 2002; MP PET 2003] |
| A. | \[C{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[{{C}_{3}}{{H}_{8}}\] |
| D. | \[{{C}_{4}}{{H}_{10}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{6}}\] | |
| 7878. |
An isotope \[_{Y}{{A}^{X}}\] undergoes a series of \[m\] alpha and \[n\] beta disintegration to form a stable isotope \[_{Y-10}{{B}^{X-32}}\]. The values of \[m\] and \[n\] are respectively [MP PET 1995] |
| A. | 6 and 8 |
| B. | 8 and 10 |
| C. | 5 and 8 |
| D. | 8 and 6 |
| Answer» E. | |
| 7879. |
The element of \[{{s}^{2}}{{p}^{2}}\] configuration is of ..... group |
| A. | IV |
| B. | III |
| C. | V |
| D. | II |
| Answer» B. III | |
| 7880. |
Which one of the following bonds has the highest average bond energy (kcal/mol) [CPMT 1994] |
| A. | \[S=O\] |
| B. | \[C\equiv C\] |
| C. | \[C\equiv N\] |
| D. | \[N\equiv N\] |
| Answer» E. | |
| 7881. |
What is the end product of the following sequences of operations \[Ca{{C}_{2}}\xrightarrow{{{H}_{2}}O}A\underset{H{{g}^{++}}}{\mathop{\xrightarrow{\text{dil}\text{. }{{H}_{2}}S{{O}_{4}}}}}\,B\underset{{{H}_{2}}}{\mathop{\xrightarrow{Ni}}}\,C\] [CPMT 1978; MP PMT 1996] |
| A. | Methyl alcohol |
| B. | Acetaldehyde |
| C. | \[{{C}_{2}}{{H}_{5}}OH\] |
| D. | \[{{C}_{2}}{{H}_{4}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{4}}\] | |
| 7882. |
\[KMn{{O}_{4}}\] in basic medium is reduced to [Orissa JEE 2005] |
| A. | \[{{K}_{2}}Mn{{O}_{4}}\] |
| B. | \[Mn{{O}_{2}}\] |
| C. | \[Mn{{(OH)}_{2}}\] |
| D. | \[M{{n}^{2+}}\] |
| Answer» C. \[Mn{{(OH)}_{2}}\] | |
| 7883. |
Which species has the maximum number of lone pair of electrons on the central atom? [IIT 2005] |
| A. | [ClO3]- |
| B. | XeF4 |
| C. | SF4 |
| D. | [I3]- |
| Answer» E. | |
| 7884. |
The highest electrical conductivity of the following aqueous solutions is of [AIEEE 2005] |
| A. | 0.1 M acetic acid |
| B. | 0.1 M chloroacetic acid |
| C. | 0.1 M fluoroacetic acid |
| D. | 0.1 M difluoroacetic acid |
| Answer» E. | |
| 7885. |
German silver is an alloy of [EAMCET 1979;CPMT 1986, 93; MP PET/PMT 1998; UPSEAT 1999; CBSE PMT 2000; KCET 2000; MP PMT 2001] |
| A. | Copper, zinc and nickel |
| B. | Copper and silver |
| C. | Copper, zinc and tin |
| D. | Copper, zinc and silver |
| Answer» B. Copper and silver | |
| 7886. |
The basic ligand is |
| A. | \[N{{H}_{3}}\] |
| B. | \[C{{N}^{-}}\] |
| C. | \[{{F}^{-}}\] |
| D. | All |
| Answer» E. | |
| 7887. |
Which of the following statements does not form part of Bohr's model of the hydrogen atom [CBSE PMT 1989] |
| A. | Energy of the electrons in the orbit is quantized |
| B. | The electron in the orbit nearest the nucleus has the lowest energy |
| C. | Electrons revolve in different orbits around the nucleus |
| D. | The position and velocity of the electrons in the orbit cannot be determined simultaneously |
| Answer» E. | |
| 7888. |
Which one of the following can be classified as a Bronsted base [KCET 2001] |
| A. | \[NO_{3}^{-}\] |
| B. | \[{{H}_{3}}{{O}^{+}}\] |
| C. | \[NH_{4}^{+}\] |
| D. | \[C{{H}_{3}}COOH\] |
| Answer» B. \[{{H}_{3}}{{O}^{+}}\] | |
| 7889. |
What will be the volume of \[C{{O}_{2}}\]at NTP obtained on heating 10 grams of (90% pure) limestone [Pb. CET 2001] |
| A. | 22.4 litre |
| B. | 2.016 litre |
| C. | 2.24 litre |
| D. | 20.16 litre |
| Answer» C. 2.24 litre | |
| 7890. |
Normal butane convert into isobutane by [RPMT 2002] |
| A. | \[LiAl{{H}_{4}}\] |
| B. | \[AlC{{l}_{3}}\] |
| C. | \[NaB{{H}_{4}}\] |
| D. | \[Zn/HCl\] |
| Answer» C. \[NaB{{H}_{4}}\] | |
| 7891. |
Chloroprene is |
| A. | 2-chloro-1, 3-butadiene |
| B. | 3-chloro-2, 3-butadiene |
| C. | 2, 3-dichlorobutadiene |
| D. | None of these |
| Answer» B. 3-chloro-2, 3-butadiene | |
| 7892. |
The atomic number of an element is always equal to [MP PMT 1994] |
| A. | Atomic weight divided by 2 |
| B. | Number of neutrons in the nucleus |
| C. | Weight of the nucleus |
| D. | Electrical charge of the nucleus |
| Answer» E. | |
| 7893. |
The final product formed when ethyl bromide is treated with excess of alcoholic KOH is [MP PET 1999] |
| A. | Ethylene |
| B. | Ethane |
| C. | Ethyne |
| D. | Vinyl bromide |
| Answer» B. Ethane | |
| 7894. |
The Van't Hoff factor will be highest for |
| A. | Sodium chloride |
| B. | Magnesium chloride |
| C. | Sodium phosphate |
| D. | Urea |
| Answer» D. Urea | |
| 7895. |
The enthalpy of vapourization of a liquid is \[30\,kJ\,mo{{l}^{-1}}\] and entropy of vapourization is \[75\,J\,mo{{l}^{-1}}K\]. The boiling point of the liquid at 1 atm is [IIT JEE (Screening) 2004] |
| A. | 250K |
| B. | 400K |
| C. | 450K |
| D. | 600K |
| Answer» C. 450K | |
| 7896. |
Anhydrous sample of ferric chloride is prepared by heating |
| A. | \[Fe+HCl\] |
| B. | \[Fe+C{{l}_{2}}\] |
| C. | \[FeC{{l}_{2}}+C{{l}_{2}}\] |
| D. | Hydrated ferric chloride |
| Answer» C. \[FeC{{l}_{2}}+C{{l}_{2}}\] | |
| 7897. |
If the density of water is 1 g \[c{{m}^{-3}}\]then the volume occupied by one molecule of water is approximately [Pb. PMT 2004] |
| A. | \[18\,\,c{{m}^{3}}\] |
| B. | \[22400\,\,c{{m}^{3}}\] |
| C. | \[6.02\times {{10}^{-23}}\,\,c{{m}^{3}}\] |
| D. | \[3.0\times {{10}^{-23}}\,\,c{{m}^{3}}\] |
| Answer» E. | |
| 7898. |
Cod liver oil is [MHCET 2004] |
| A. | An emulsion |
| B. | Solution |
| C. | Colloidal solution |
| D. | Suspension |
| Answer» B. Solution | |
| 7899. |
An example of an associated colloid is [CBSE PMT 2000; MP PET 2000] |
| A. | Milk |
| B. | Soap solution |
| C. | Rubber latex |
| D. | Vegetable oil |
| Answer» C. Rubber latex | |
| 7900. |
Catalyst used in hydrogenation of oils is [CPMT 1975; MNR 1986; DPMT 1982, 85;BHU 1973, 87; EAMCET 1987; AFMC 1993; CET Pune 1998] |
| A. | \[Pt\] |
| B. | \[Mo\] |
| C. | \[Fe\] |
| D. | \[Ni\] |
| Answer» E. | |