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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.
| 7701. |
In which of the following, the bond length between hybridized carbon atom and other carbon atom is minimum [MH CET 2003] |
| A. | Propyne |
| B. | Propene |
| C. | Butane |
| D. | Propane |
| Answer» B. Propene | |
| 7702. |
For a system in equilibrium \[\Delta G=0\] under conditions of constant [KCET 1992, 2005] |
| A. | Temperature and pressure |
| B. | Temperature and volume |
| C. | Energy and volume |
| D. | Pressure and volume |
| Answer» B. Temperature and volume | |
| 7703. |
When a freshly precipitated substance is converted into a colloidal solution with the help of a third substance, the process is known as |
| A. | Coagulation |
| B. | Peptization |
| C. | Electrodispersion |
| D. | Dialysis |
| Answer» C. Electrodispersion | |
| 7704. |
Which of the following has the lowest freezing point [UPSEAT 2004] |
| A. | 0.1 m sucrose |
| B. | 0.1 m urea |
| C. | 0.1 m ethanol |
| D. | 0.1 m glucose |
| Answer» D. 0.1 m glucose | |
| 7705. |
Which compound is not inflammable [MP PET 2001] |
| A. | \[CC{{l}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{5}}OH\] |
| C. | \[C{{H}_{4}}\] |
| D. | \[{{C}_{6}}{{H}_{6}}\] |
| Answer» D. \[{{C}_{6}}{{H}_{6}}\] | |
| 7706. |
Solder is an alloy of [Pb. CET 2003] |
| A. | \[Pb+Zn+Sn\] |
| B. | \[Pb+Zn\] |
| C. | \[Pb+Sn\] |
| D. | \[Sn+Zn\] |
| Answer» D. \[Sn+Zn\] | |
| 7707. |
The reagent which forms crystalline osazone derivative when reacted with glucose, is [CPMT 1990] |
| A. | Fehling solution |
| B. | Phenylhydrazine |
| C. | Benedict solution |
| D. | Hydroxylamine |
| Answer» C. Benedict solution | |
| 7708. |
The decomposition of \[{{H}_{2}}{{O}_{2}}\] can be slowed down by the addition of small amount of phosphoric acid which act as [JIPMER 2000] |
| A. | Promoter |
| B. | Inhibitor |
| C. | Detainer |
| D. | Stopper |
| Answer» C. Detainer | |
| 7709. |
Daily use candles (paraffin wax) contain [CPMT 1996] |
| A. | Higher saturated hydrocarbon |
| B. | Lower saturated hydrocarbon |
| C. | Higher unsaturated hydrocarbon |
| D. | Lower unsaturated hydrocarbon |
| Answer» B. Lower saturated hydrocarbon | |
| 7710. |
Which hydrocarbon will be most stable [MP PET 2000, 03] |
| A. | Methane |
| B. | Ethane |
| C. | Propane |
| D. | Butane |
| Answer» E. | |
| 7711. |
Which of the following does not give alkane [MP PMT 1999] |
| A. | Reaction of \[C{{H}_{3}}I\] with Na in ether |
| B. | Reaction of sodium acetate with sodalime |
| C. | Electrolysis of concentrated sodium acetate solution |
| D. | Reaction of ethyl chloride with alco. KOH |
| Answer» E. | |
| 7712. |
Equivalent weight of \[KMn{{O}_{4}}\] acting as an oxidant in acidic medium is [CPMT 1990; MP PET 1999] |
| A. | The same as its molecular weight |
| B. | Half of its molecular weight |
| C. | One-third of its molecular weight |
| D. | One-fifth of its molecular weight |
| Answer» E. | |
| 7713. |
A compound ?X? on ozonolysis forms two molecules of HCHO. Compound ?X? is [AIIMS 1987; CPMT 1993] |
| A. | \[{{C}_{2}}{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{2}}\] |
| C. | \[{{C}_{2}}{{H}_{6}}\] |
| D. | \[{{C}_{6}}{{H}_{6}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{2}}\] | |
| 7714. |
The equivalent weight of \[MnS{{O}_{4}}\]is half its molecular weight when it is converted to [IIT 1988; CPMT 1994] |
| A. | \[M{{n}_{2}}{{O}_{3}}\] |
| B. | \[Mn{{O}_{2}}\] |
| C. | \[Mn{{O}_{4}}\] |
| D. | \[MnO_{4}^{2-}\] |
| Answer» C. \[Mn{{O}_{4}}\] | |
| 7715. |
Which metal is protected by a layer of its own oxide [NCERT 1981; DPMT 1983; BHU 1998] |
| A. | \[Al\] |
| B. | \[Ag\] |
| C. | \[Au\] |
| D. | \[Fe\] |
| Answer» B. \[Ag\] | |
| 7716. |
Using anhydrous \[AlC{{l}_{3}}\] as catalyst, which one of the following reaction produces ethylbenzene \[(PhEt)\] [CBSE PMT 2004] |
| A. | \[{{H}_{2}}C=C{{H}_{2}}+{{C}_{6}}{{H}_{6}}\] |
| B. | \[{{H}_{3}}C-C{{H}_{3}}+{{C}_{6}}{{H}_{6}}\] |
| C. | \[{{H}_{3}}C-C{{H}_{2}}OH+{{C}_{6}}{{H}_{6}}\] |
| D. | \[C{{H}_{3}}-CH=C{{H}_{2}}+{{C}_{6}}{{H}_{6}}\] |
| Answer» B. \[{{H}_{3}}C-C{{H}_{3}}+{{C}_{6}}{{H}_{6}}\] | |
| 7717. |
Most stable oxidation state of iron is [AFMC 1976; CPMT 1988] |
| A. | \[+2\] |
| B. | \[+3\] |
| C. | \[-2\] |
| D. | \[-3\] |
| Answer» C. \[-2\] | |
| 7718. |
When metallic copper comes in contact with moisture, a green powdery/ pasty coating can be seen over it. This is chemically known as [AFMC 2002] |
| A. | Copper sulphide - Copper carbonate |
| B. | Copper carbonate - Copper sulphate |
| C. | Copper carbonate - Copper hydroxide |
| D. | Copper Sulphate - Copper sulphide |
| Answer» D. Copper Sulphate - Copper sulphide | |
| 7719. |
Given the molecular formula of the hexa coordinated complexes A \[CoC{{l}_{3}}.6N{{H}_{3}}\] B \[CoC{{l}_{3}}.5N{{H}_{3}}\] C \[CoC{{l}_{3}}.4N{{H}_{3}}\]. If the number of co-ordinated \[N{{H}_{3}}\] molecules in A, B and C respectively are 6, 5 and 4, the primary valency in A, B and C are: [DCE 2003] |
| A. | 6, 5, 4 |
| B. | 3, 2, 1 |
| C. | 0, 1, 2 |
| D. | 3, 3, 3 |
| Answer» C. 0, 1, 2 | |
| 7720. |
Which one has the highest boiling point [CBSE PMT 1990] |
| A. | \[0.1N\,N{{a}_{2}}S{{O}_{4}}\] |
| B. | \[0.1N\,MgS{{O}_{4}}\] |
| C. | \[0.1M\,A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] |
| D. | \[0.1M\,BaS{{O}_{4}}\] |
| Answer» D. \[0.1M\,BaS{{O}_{4}}\] | |
| 7721. |
The modern basis of atomic weight is [MP PET 1989; CPMT 1993] |
| A. | Isotope \[{{H}^{1}}=1.000\] |
| B. | Oxygen = 16.000 |
| C. | Isotope \[{{O}^{16}}=16.000\] |
| D. | Isotope \[{{C}^{12}}=12.000\] |
| Answer» E. | |
| 7722. |
Gold sol is an electronegative sol. The amount of electrolyte required to coagulate a certain amount of gold sol is minimum in the case of [KCET (Med.) 2001] |
| A. | \[CaC{{l}_{2}}\] |
| B. | \[NaCl\] |
| C. | \[AlC{{l}_{3}}\] |
| D. | \[N{{a}_{2}}S{{O}_{4}}\] |
| Answer» D. \[N{{a}_{2}}S{{O}_{4}}\] | |
| 7723. |
\[{{K}_{3}}\left[ Fe{{(CN)}_{6}} \right]\] is called |
| A. | Potassium ferricyanide |
| B. | Red prussiate of potash |
| C. | Potassium hexacyanoferrate (III) |
| D. | All of these |
| Answer» E. | |
| 7724. |
The 'middle oil' fraction of coaltar distillation contains [MP PET 2001] |
| A. | Benzene |
| B. | Anthracene |
| C. | Naphthalene |
| D. | Xylene |
| Answer» D. Xylene | |
| 7725. |
Which is used in motion picture films |
| A. | Cellulose acetate |
| B. | Glucose acetate |
| C. | Starch acetate |
| D. | Sucrose acetate |
| Answer» B. Glucose acetate | |
| 7726. |
The positive value of \[\Delta S\] indicates that [MP PMT 1997] |
| A. | The system becomes less disordered |
| B. | The system becomes more disordered |
| C. | The system is in equilibrium position |
| D. | The system tends to reach at equilibrium position |
| Answer» C. The system is in equilibrium position | |
| 7727. |
The simplest way to check whether a system is colloidal, is [KCET (Med.) 2002] |
| A. | Tyndall effect |
| B. | Electro dialysis |
| C. | Brownian movement |
| D. | Finding out particle size |
| Answer» B. Electro dialysis | |
| 7728. |
Flocculation value is expressed in terms of [MP PMT 1986] |
| A. | millimole per litre |
| B. | mole per litre |
| C. | gram per litre |
| D. | mole per milliliter |
| Answer» B. mole per litre | |
| 7729. |
Which of the C - C bond is strongest |
| A. | Formed by \[s{{p}^{3}}-s{{p}^{3}}\] hybridised carbon atoms (as in alkanes) |
| B. | Formed by \[s{{p}^{2}}-s{{p}^{2}}\] hybridised carbon atoms (as in alkenes) |
| C. | Formed by \[sp-sp\] hybridised carbon atoms (as in alkynes) |
| D. | All are equal |
| Answer» D. All are equal | |
| 7730. |
Malachite is a mineral of [MP PMT 1990; MP PET 1992, 98, 2000; MP PMT 1998] |
| A. | \[Zn\] |
| B. | \[Fe\] |
| C. | \[Hg\] |
| D. | \[Cu\] |
| Answer» E. | |
| 7731. |
Aqueous solution of \[CuS{{O}_{4}}.5{{H}_{2}}O\] changes blue litmus paper to red due to [CPMT 1979; MP PMT 1989] |
| A. | Presence of \[C{{u}^{++}}\] ions |
| B. | Presence of \[S{{O}_{4}}^{--}\] ions |
| C. | Hydrolysis taking place |
| D. | Reduction taking place |
| Answer» D. Reduction taking place | |
| 7732. |
The element 90Th232 belongs to thorium series. Which of the following will act as the end product of the series [BHU 2005] |
| A. | 82Pb208 |
| B. | 82Bi209 |
| C. | 82Pb206 |
| D. | 82Pb207 |
| Answer» B. 82Bi209 | |
| 7733. |
According to Graham, colloids are those substances which are |
| A. | Insoluble in water |
| B. | In solution do not pass through filter paper |
| C. | Of definite size of particles |
| D. | Separated from crystalloids by parchment paper |
| Answer» E. | |
| 7734. |
An azeotropic solution of two liquids has boiling point lower than either when it [NCERT 1978; IIT 1981] |
| A. | Shows a negative deviation from Raoult's law |
| B. | Shows no deviation from Raoult's law |
| C. | Shows positive deviation from Raoult's law |
| D. | Is saturated |
| Answer» D. Is saturated | |
| 7735. |
Coordination number of Zn in ZnS (zinc blende) is [Orissa JEE 2004] |
| A. | 6 |
| B. | 4 |
| C. | 8 |
| D. | 12 |
| Answer» C. 8 | |
| 7736. |
To prepare a pure sample of n-hexane using sodium metal as one reactant, the other reactant will be [BHU 1999] |
| A. | n-propyl bromide |
| B. | Ethyl bromide and n-butyl bromide |
| C. | Ethyl chloride and n-butyl chloride |
| D. | Methyl bromide and n -pentyl chloride |
| Answer» B. Ethyl bromide and n-butyl bromide | |
| 7737. |
Which of the following has cross-links |
| A. | Vulcanised rubber |
| B. | Nylon |
| C. | Phenol-formaldehyde resins |
| D. | Both A and C are correct |
| Answer» E. | |
| 7738. |
Stainless steel does not rust because [KCET 2004] |
| A. | Chromium and nickel combine with iron |
| B. | Chromium forms an oxide layer and protects iron from rusting |
| C. | Nickel present in it, does not rust |
| D. | Iron forms a hard chemical compound with chromium present in it. |
| Answer» C. Nickel present in it, does not rust | |
| 7739. |
In the coordinate valency [CPMT 1989] |
| A. | Electrons are equally shared by the atoms |
| B. | Electrons of one atom are shared with two atoms |
| C. | Hydrogen bond is formed |
| D. | None of the above |
| Answer» C. Hydrogen bond is formed | |
| 7740. |
An example of double salt is [CPMT 1986; CBSE PMT 1989; Roorkee 1990] |
| A. | Bleaching powder |
| B. | \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] |
| C. | Hypo |
| D. | Potash alum |
| Answer» E. | |
| 7741. |
Aluminium is obtained by [KCET 1992; RPMT 2002] |
| A. | Reducing \[A{{l}_{2}}{{O}_{3}}\] with coke |
| B. | Electrolysing \[A{{l}_{2}}{{O}_{3}}\] dissolved in \[N{{a}_{3}}Al{{F}_{6}}\] |
| C. | Reducing \[A{{l}_{2}}{{O}_{3}}\] with chromium |
| D. | Heating alumina and cryolite |
| Answer» C. Reducing \[A{{l}_{2}}{{O}_{3}}\] with chromium | |
| 7742. |
A colloidal solution can be purified by [MP PET 1993; CPMT 1990; MP PMT 2001] |
| A. | Filtration |
| B. | Peptization |
| C. | Coagulation |
| D. | Dialysis |
| Answer» E. | |
| 7743. |
Which of the following terms is not related with colloids [CPMT 1985, 87, 88] |
| A. | Dialysis |
| B. | Ultrafiltration |
| C. | Wavelength |
| D. | Brownian movement |
| Answer» D. Brownian movement | |
| 7744. |
Dry air was passed successively through a solution of \[5\,gm\] of a solute in \[80gm\] of water and then through pure water. The loss in weight of solution was \[2.50\,gm\] and that of pure solvent \[0.04\,gm\]. What is the molecular weight of the solute [MP PMT 1986] |
| A. | 70.31 |
| B. | 7.143 |
| C. | 714.3 |
| D. | 80 |
| Answer» B. 7.143 | |
| 7745. |
The numbers of sigma (\[\sigma \]) bonds in 1-butene is [MP PMT 1995] |
| A. | 8 |
| B. | 10 |
| C. | 11 |
| D. | 12 |
| Answer» D. 12 | |
| 7746. |
Which of the following has diamagnetic character [Pb. CET 2003] |
| A. | \[{{[NiC{{l}_{4}}]}^{2-}}\] |
| B. | \[{{[Co{{F}_{6}}]}^{3-}}\] |
| C. | \[{{[Fe{{({{H}_{2}}O)}_{6}}]}^{2+}}\] |
| D. | \[{{[Ni{{(CN)}_{4}}]}^{2-}}\] |
| Answer» E. | |
| 7747. |
An element A dissolves both in acid and alkali. It is an example of [NCERT 1972] |
| A. | Allotropic nature of A |
| B. | Dimorphic nature of A |
| C. | Amorphous nature of A |
| D. | Amphoteric nature of A |
| Answer» E. | |
| 7748. |
Cyanide process is used in the extraction of [DCE 2002, 03] |
| A. | \[Au\] |
| B. | Ag |
| C. | both a and b |
| D. | Cu |
| Answer» D. Cu | |
| 7749. |
Synthetic fibres like nylon-66 are very strong because |
| A. | They have high molecular weights and high melting points |
| B. | They have a high degree of cross-linking by strong \[C-C\] bond |
| C. | They have linear molecules consisting of very long chains |
| D. | They have linear molecules interlinked with forces like hydrogen bonding |
| Answer» E. | |
| 7750. |
The ratio of area covered by second orbital to the first orbital is [AFMC 2004] |
| A. | 1 : 2 |
| B. | 1 : 16 |
| C. | 8 : 1 |
| D. | 16 : 1 |
| Answer» E. | |