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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.
| 7801. |
What does not change on changing temperature [DCE 2001] |
| A. | Mole fraction |
| B. | Normality |
| C. | Molality |
| D. | None of these |
| Answer» B. Normality | |
| 7802. |
Which of the following compounds of lead is used in match industry |
| A. | \[PbO\] |
| B. | \[Pb{{O}_{2}}\] |
| C. | \[PbC{{l}_{2}}\] |
| D. | None of these |
| Answer» C. \[PbC{{l}_{2}}\] | |
| 7803. |
General formula of alkane is [EAMCET 1979; Manipal MEE 1995] |
| A. | \[{{C}_{n}}{{H}_{2n+2}}\] |
| B. | \[{{C}_{n}}{{H}_{2n-1}}\] |
| C. | \[{{C}_{n}}{{H}_{2n}}\] |
| D. | \[{{C}_{n}}{{H}_{2n+1}}\] |
| Answer» B. \[{{C}_{n}}{{H}_{2n-1}}\] | |
| 7804. |
1, 3-butadiene has [JIPMER 2000] |
| A. | sp and \[s{{p}^{2}}\] hybridised C-atoms |
| B. | sp, \[s{{p}^{2}}\] and \[s{{p}^{3}}\] hybridized C-atoms |
| C. | Only \[s{{p}^{2}}\] hybridised C-atoms |
| D. | Only sp hybridised C-atoms |
| Answer» D. Only sp hybridised C-atoms | |
| 7805. |
Impurities of lead in silver are removed by [AllMS 1987] |
| A. | Park process |
| B. | Solvey process |
| C. | Cyanide process |
| D. | Amalgamation process |
| Answer» B. Solvey process | |
| 7806. |
Which of the following kinds of catalysis can be explained by the adsorption theory? [MP PET/PMT 1998] |
| A. | Homogeneous catalysis |
| B. | Acid base catalysis |
| C. | Heterogeneous catalysis |
| D. | Enzyme catalysis |
| Answer» D. Enzyme catalysis | |
| 7807. |
The minimum quantity of sodium chloride which is necessary to precipitate 10 litres of sol in two hours is 0.585 gm. The flocculation value of sodium chloride is |
| A. | 0.585 |
| B. | 0.0585 |
| C. | 0.1 |
| D. | One |
| Answer» E. | |
| 7808. |
Each carbon atom in benzene is in the state of hybridization [CPMT 1973, 83, 89; MP PMT 1993; KCET (Med.) 1999; DCE 2001] |
| A. | \[s{{p}^{3}}\] |
| B. | \[s{{p}^{2}}\] |
| C. | \[sp\] |
| D. | \[{{s}^{3}}p\] |
| Answer» C. \[sp\] | |
| 7809. |
When beryllium is bombarded with \[\alpha \]-particles, extremely penetrating radiations which cannot be deflected by electrical or magnetic field are given out. These are [CPMT 1983] |
| A. | A beam of protons |
| B. | \[\alpha \]-rays |
| C. | A beam of neutrons |
| D. | X-rays |
| Answer» D. X-rays | |
| 7810. |
When orthoboric acid \[({{H}_{3}}B{{O}_{3}})\] is heated, the residue left is [Pb. PMT 2002] |
| A. | Metaboric acid |
| B. | Boron |
| C. | Boric anhydride |
| D. | Borax |
| Answer» D. Borax | |
| 7811. |
Which one of the following organic compounds decolourizes an alkaline \[KMn{{O}_{4}}\] solution [CPMT 1987, 93] |
| A. | \[C{{S}_{2}}\] |
| B. | \[{{C}_{3}}{{H}_{6}}\] |
| C. | \[{{C}_{3}}{{H}_{8}}\] |
| D. | \[C{{H}_{3}}OH\] |
| Answer» C. \[{{C}_{3}}{{H}_{8}}\] | |
| 7812. |
In which of the following species is the underlined carbon having \[s{{p}^{3}}\] hybridisation [AIEEE 2002] |
| A. | \[C{{H}_{3}}\underline{C}OOH\] |
| B. | \[C{{H}_{3}}\,\,\underline{C}{{H}_{2}}OH\] |
| C. | \[C{{H}_{3}}\underline{C}OC{{H}_{3}}\] |
| D. | \[C{{H}_{2}}=\underline{C}H-C{{H}_{3}}\] |
| Answer» C. \[C{{H}_{3}}\underline{C}OC{{H}_{3}}\] | |
| 7813. |
Anhydrous \[AlC{{l}_{3}}\] cannot be obtained from which of the following reactions [CPMT 1987] |
| A. | Heating \[AlC{{l}_{3}}.6{{H}_{2}}O\] |
| B. | By passing dry \[HCl\] over hot aluminium powder |
| C. | By passing dry \[C{{l}_{2}}\] over hot aluminium powder |
| D. | By passing dry \[C{{l}_{2}}\] over a hot mixture of alumina and coke |
| Answer» B. By passing dry \[HCl\] over hot aluminium powder | |
| 7814. |
Atomic number after a \[\beta \]-emission from a nucleus having atomic number 40, will be [BHU 1981] |
| A. | 36 |
| B. | 39 |
| C. | 41 |
| D. | 44 |
| Answer» D. 44 | |
| 7815. |
Thermosetting plastics are |
| A. | Soluble in water |
| B. | Soluble in alcohol |
| C. | Soluble in benzene |
| D. | Insoluble |
| Answer» E. | |
| 7816. |
According to the collision theory of reaction rates, rate of reaction increases with temperature due to |
| A. | Greater number of collisions |
| B. | Greater velocity of the reacting molecules |
| C. | Greater number of molecules have activation energy |
| D. | None of the above |
| Answer» D. None of the above | |
| 7817. |
The appreciable radioactivity of uranium minerals is mainly due to [NCERT 1980] |
| A. | An uranium isotope of mass number 235 |
| B. | A thorium isotope of mass number 232 |
| C. | Actinium |
| D. | Radium |
| Answer» E. | |
| 7818. |
Terylene is used for making [AFMC 2002] |
| A. | Silks |
| B. | Fabrics |
| C. | Seat belts |
| D. | All of these |
| Answer» E. | |
| 7819. |
The compound that is most reactive towards electrophilic nitration is [IIT-JEE 1985; AIIMS 1998; MP PET/PMT 1998] |
| A. | Toluene |
| B. | Benzene |
| C. | Benzoic acid |
| D. | Nitrobenzene |
| Answer» B. Benzene | |
| 7820. |
On heating \[Mn{{(OH)}_{2}}\] with \[Pb{{O}_{2}}\] and conc. \[HN{{O}_{3}}\] pink colour is obtained due to the formation of [MP PET 1995] |
| A. | \[KMn{{O}_{4}}\] |
| B. | \[HMn{{O}_{4}}\] |
| C. | \[Pb{{(Mn{{O}_{4}})}_{2}}\] |
| D. | \[PbMn{{O}_{4}}\] |
| Answer» C. \[Pb{{(Mn{{O}_{4}})}_{2}}\] | |
| 7821. |
Stainless steel is non-corrosive. This character is more prominent in |
| A. | \[Mn\] steel |
| B. | Ordinary steel |
| C. | \[Ti\] steel |
| D. | All of these |
| Answer» D. All of these | |
| 7822. |
Iron ore is concentrated by [MP PMT 1991] |
| A. | Froth floatation |
| B. | Electrolysis |
| C. | Roasting |
| D. | Magnetic treatment |
| Answer» E. | |
| 7823. |
\[A{{s}_{2}}{{S}_{3}}\] sol has a negative charge. Capacity to precipitate it is highest in [CPMT 1982, 89, 93; DPMT 1983;MP PET 1999] |
| A. | \[AlC{{l}_{3}}\] |
| B. | \[N{{a}_{3}}P{{O}_{4}}\] |
| C. | \[CaC{{l}_{2}}\] |
| D. | \[{{K}_{2}}S{{O}_{4}}\] |
| Answer» B. \[N{{a}_{3}}P{{O}_{4}}\] | |
| 7824. |
Which of the following is a natural polymer |
| A. | Polyester |
| B. | Glyptal |
| C. | Starch |
| D. | Nylon-6 |
| Answer» D. Nylon-6 | |
| 7825. |
Which one of the following oxides is ionic [IIT-JEE 1995] |
| A. | \[MnO\] |
| B. | \[M{{n}_{2}}{{O}_{7}}\] |
| C. | \[Cr{{O}_{3}}\] |
| D. | \[{{P}_{2}}{{O}_{5}}\] |
| Answer» B. \[M{{n}_{2}}{{O}_{7}}\] | |
| 7826. |
Bohr's radius can have [DPMT 1996] |
| A. | Discrete values |
| B. | \[+ve\]values |
| C. | \[-ve\]values |
| D. | Fractional values |
| Answer» C. \[-ve\]values | |
| 7827. |
\[CH\equiv CH\underset{{{H}_{2}}S{{O}_{4}}}{\mathop{\xrightarrow{HgS{{O}_{4}}}}}\,\underset{{{H}_{2}}O}{\mathop{\xrightarrow{C{{H}_{3}}MgBr}}}\,\xrightarrow{P/B{{r}_{2}}}\] [DPMT 2005] |
| A. | \[C{{H}_{3}}CH(Br)C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br\] |
| C. | \[C{{H}_{2}}=CH-Br\] |
| D. | \[BrCH=CH-C{{H}_{3}}\] |
| Answer» B. \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br\] | |
| 7828. |
Teflon is a polymer of [Kerala PMT 2004] |
| A. | Tetrafluoro ethane |
| B. | Tetrafluro propene |
| C. | Difluorodichloro ethane |
| D. | Difluoro ethane |
| E. | Trifluoro ethane |
| Answer» B. Tetrafluro propene | |
| 7829. |
Different colloidal particles of gold having different colours, obtained from different methods due to [MP PET 1989; UPSEAT 2001, 02; EAMCET 2003] |
| A. | Variable valency of gold |
| B. | Different concentration of gold particles |
| C. | Different types of impurities |
| D. | Different radius of colloidal particles |
| Answer» E. | |
| 7830. |
Which one of the following does not represent Arrhenius equation |
| A. | \[k=A{{e}^{-E/RT}}\] |
| B. | \[{{\log }_{e}}k={{\log }_{e}}A-\frac{E}{RT}\] |
| C. | \[{{\log }_{10}}k={{\log }_{10}}A-\frac{E}{2.303\,RT}\] |
| D. | \[k=A{{E}^{-RT}}\] |
| Answer» E. | |
| 7831. |
In Bohr?s model, atomic radius of the first orbit is \[\gamma \], the radius of the 3rd orbit, is [MP PET 1997; Pb. CET 2001] |
| A. | \[\gamma /3\] |
| B. | \[\gamma \] |
| C. | \[3\gamma \] |
| D. | \[9\gamma \] |
| Answer» E. | |
| 7832. |
\[B{{e}^{2+}}\] is isoelectronic with [EAMCET 1998] |
| A. | \[M{{g}^{2+}}\] |
| B. | \[N{{a}^{+}}\] |
| C. | \[L{{i}^{+}}\] |
| D. | \[{{H}^{+}}\] |
| Answer» D. \[{{H}^{+}}\] | |
| 7833. |
For the electrolytic production of aluminium, (i) the cathode and (ii) the anode are made of |
| A. | (i) Platinum and (ii) Iron |
| B. | (i) Copper and (ii) Iron |
| C. | (i) Copper and (ii) Carbon |
| D. | (i) Carbon and (ii) Carbon |
| Answer» E. | |
| 7834. |
Heating an aqueous solution of aluminium chloride to dryness will give [AIEEE 2005] |
| A. | \[AlC{{l}_{3}}\] |
| B. | \[A{{l}_{2}}C{{l}_{6}}\] |
| C. | \[A{{l}_{2}}{{O}_{3}}\] |
| D. | \[Al(OH)C{{l}_{2}}\] |
| Answer» D. \[Al(OH)C{{l}_{2}}\] | |
| 7835. |
High concentration of gelatin in water on heating gives colloidal solution, which is called |
| A. | Foam |
| B. | Gel |
| C. | Gas |
| D. | Air |
| Answer» C. Gas | |
| 7836. |
One mole of water at \[{{100}^{o}}C\] is converted into steam at \[{{100}^{o}}C\] at a constant pressure of 1 atm. The change in entropy is [heat of vaporisation of water at \[{{100}^{o}}C=540\,cal/gm\]] [Pb. PMT 2004] |
| A. | 8.74 |
| B. | 18.76 |
| C. | 24.06 |
| D. | 26.06 |
| Answer» E. | |
| 7837. |
Enzymes are [BHU 1982] |
| A. | Substances made by chemists to activate washing powder |
| B. | Very active vegetable catalysts |
| C. | Catalysts found in organism |
| D. | Synthetic catalysts |
| Answer» D. Synthetic catalysts | |
| 7838. |
Which of the following conducts electricity [AFMC 1995] |
| A. | Fused \[NaCl\] |
| B. | \[C{{O}_{2}}\] |
| C. | \[B{{r}_{2}}\] |
| D. | \[Si\] |
| Answer» B. \[C{{O}_{2}}\] | |
| 7839. |
Polyethylene is [DCE 2003] |
| A. | Random copolymer |
| B. | Homo polymer |
| C. | Alternate copolymer |
| D. | Cross linked copolymer |
| Answer» C. Alternate copolymer | |
| 7840. |
About the basic open hearth process, which statement is wrong |
| A. | Limestone is added to the charge |
| B. | Phosphorus impurity cannot be removed by this process |
| C. | Carbon content of the steel can be uniformly controlled over a series of batches |
| D. | Iron scrap can be utilized |
| Answer» B. Phosphorus impurity cannot be removed by this process | |
| 7841. |
How can ethene be produced from ethanol [BHU 1996] |
| A. | By dehydrohalogenation |
| B. | By dehydrogenation |
| C. | By dehydration with conc. \[{{H}_{2}}S{{O}_{4}}\] at \[{{170}^{o}}C\] |
| D. | By reduction with hydrogen iodide |
| Answer» D. By reduction with hydrogen iodide | |
| 7842. |
Number of acidic hydrogen atoms in butyne-1 are [MP PET 1986] |
| A. | 2 |
| B. | 3 |
| C. | 1 |
| D. | 4 |
| Answer» D. 4 | |
| 7843. |
Markownikoff's rule provides guidance of addition of HBr on [MNR 1994] |
| A. | \[C{{H}_{2}}=C{{H}_{2}}\] |
| B. | \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{3}}\] |
| C. | \[C{{H}_{3}}CH=CHC{{H}_{3}}\] |
| D. | \[C{{H}_{2}}=CHBr\] |
| Answer» E. | |
| 7844. |
Which among the following species have the same number of electrons in its outermost as well as penultimate shell [DCE 2004] |
| A. | \[M{{g}^{2+}}\] |
| B. | \[{{O}^{2-}}\] |
| C. | \[{{F}^{-}}\] |
| D. | \[C{{a}^{2+}}\] |
| Answer» E. | |
| 7845. |
Consider the Galvanic cell \[\,Z{{n}^{\Theta }}|ZnS{{O}_{4}}||CuS{{O}_{4}}|C{{u}^{\oplus }}\] the reaction at cathode is [AMU 2000] |
| A. | \[Z{{n}^{2}}^{+}+2{{e}^{-}}\to Zn\] |
| B. | \[C{{u}^{2+}}+2{{e}^{-}}\to Cu\] |
| C. | \[C{{u}^{2+}}+Zn\to Cu+Z{{n}^{2+}}\] |
| D. | \[Z{{n}^{2+}}+Cu\to Zn+C{{u}^{2+}}\] |
| Answer» C. \[C{{u}^{2+}}+Zn\to Cu+Z{{n}^{2+}}\] | |
| 7846. |
Which of the statements about anhydrous aluminium chloride is correct [IIT 1981] |
| A. | It exists as \[AlC{{l}_{3}}\] molecule |
| B. | It is not easily hydrolysed |
| C. | It sublimes at \[{{100}^{o}}C\] under vacuum |
| D. | It is a strong Lewis base |
| Answer» D. It is a strong Lewis base | |
| 7847. |
Lyophobic colloids are [MP PMT 1986; DPMT 1996] |
| A. | Reversible colloids |
| B. | Irreversible colloids |
| C. | Protective colloids |
| D. | Gum proteins |
| Answer» C. Protective colloids | |
| 7848. |
Polyvinyl chloride is |
| A. | An isomer of vinyl chloride |
| B. | An addition product of vinyl chloride |
| C. | An allotrope polymer of vinyl chloride |
| D. | A polymer of hydrated vinyl chloride |
| Answer» C. An allotrope polymer of vinyl chloride | |
| 7849. |
Which of the following can act as protective colloids |
| A. | Hydrophobic sols |
| B. | Hydrophilic sol |
| C. | Gold sol |
| D. | None of these |
| Answer» C. Gold sol | |
| 7850. |
2-chlorobutane is heated with alcoholic NaOH, the product formed in larger amount is [RPET 1999; AMU 2000] |
| A. | 1-Butene |
| B. | 1-Butyne |
| C. | 2-Butene |
| D. | All of these |
| Answer» D. All of these | |