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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.
| 9401. |
The random or zig-zag motion of the colloidal particles in the dispersion medium is referred to as [CPMT 1985; JIPMER 1997; MP PET 2000] |
| A. | Electro-osmosis |
| B. | Electrophoresis |
| C. | Brownian movement |
| D. | Tyndall effect |
| Answer» D. Tyndall effect | |
| 9402. |
If a strip of \[Cu\] metal is placed in a solution of ferrous sulphate [NCERT 1974; CPMT 1977; MP PET 2000] |
| A. | Copper will precipitate out |
| B. | Iron will precipitate out |
| C. | Copper will dissolve |
| D. | No reaction will take place |
| Answer» E. | |
| 9403. |
\[p{{K}_{a}}\] of a weak acid is defined as [JIPMER 1999] |
| A. | log\[_{10}{{K}_{a}}\] |
| B. | \[\frac{1}{lo{{g}_{10}}{{K}_{a}}}\] |
| C. | log \[_{10}\frac{1}{{{K}_{a}}}\] |
| D. | ?log \[_{10}\frac{1}{{{K}_{a}}}\] |
| Answer» D. ?log \[_{10}\frac{1}{{{K}_{a}}}\] | |
| 9404. |
It is general principle that the less energy a system contains, it is [MH CET 1999] |
| A. | Less stable |
| B. | More stable |
| C. | Unstable |
| D. | More unstable |
| Answer» C. Unstable | |
| 9405. |
The coordination number of \[Cu\] in complex \[{{\left[ Cu{{\left( {{H}_{2}}O \right)}_{4}} \right]}^{++}}\] is [MP PET 1995] |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» B. 3 | |
| 9406. |
The change in optical rotation with time of freshly prepared solutions of sugar is known as [JIPMER 2000] |
| A. | Maturation |
| B. | Rotatory motion |
| C. | Inversion |
| D. | Specific rotation |
| Answer» D. Specific rotation | |
| 9407. |
\[{{H}_{2}}\] evolved at STP on complete reaction of 27 g of Aluminium with excess of aqueous \[NaOH\] would be [CPMT 1991] |
| A. | 22.4 |
| B. | 44.8 |
| C. | 67.2 |
| D. | 33.6 litres |
| Answer» E. | |
| 9408. |
Successive alkanes differ by [MP PMT 2002] |
| A. | \[>C{{H}_{2}}\] |
| B. | \[>CH\] |
| C. | \[-\,\,C{{H}_{3}}\] |
| D. | \[{{C}_{2}}{{H}_{4}}\] |
| Answer» B. \[>CH\] | |
| 9409. |
The compound that is not a Lewis acid is [IIT 1985] |
| A. | \[HSO_{4}^{-}\] |
| B. | \[AlC{{l}_{3}}\] |
| C. | \[BeC{{l}_{2}}\] |
| D. | \[N{{H}_{3}}\] |
| Answer» E. | |
| 9410. |
In the case of small cuts, bleeding is stopped by applying potash alum. Here alum acts as [KCET (Med.) 2001] |
| A. | Fungicide |
| B. | Disinfectant |
| C. | Germicide |
| D. | Coagulating agent |
| Answer» E. | |
| 9411. |
A fuel contains 25 % n-heptane and 75 % iso-octane. Its octane number is [MP PMT 1993; MP PET 1994] |
| A. | 50 |
| B. | 75 |
| C. | 100 |
| D. | 25 |
| Answer» C. 100 | |
| 9412. |
Bessemer converter is used for [AFMC 2004] |
| A. | Steel |
| B. | Wrought iron |
| C. | Pig iron |
| D. | Cast iron |
| Answer» D. Cast iron | |
| 9413. |
Artificial radioactivity was first discovered by [CPMT 1972; BHU 1984; KCET 1999] |
| A. | Seaberg |
| B. | Rutherford |
| C. | Einstein |
| D. | Irene Curie & Juliot |
| Answer» E. | |
| 9414. |
The preparation of ethane by electrolysis of aqueous solution of potassium acetate is called as [MP PMT 1995] |
| A. | Wurtz reaction |
| B. | Sabatier-Senderen's reaction |
| C. | Kolbe's synthesis |
| D. | Grignard reaction |
| Answer» C. Kolbe's synthesis | |
| 9415. |
Percentage composition of an organic compounds is as follows: C = 10.06, H = 0.84, Cl = 89.10. Which of the following corresponds to its molecular formula if the vapour density is 60.0 [AMU 2001] |
| A. | \[C{{H}_{2}}C{{l}_{2}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[C{{H}_{3}}Cl\] |
| D. | None of these |
| Answer» C. \[C{{H}_{3}}Cl\] | |
| 9416. |
In the qualitative analysis of nitrate a brown ring is formed due to the formation of [AMU 2001] |
| A. | \[N{{O}_{2}}\] |
| B. | \[FeS{{O}_{4}}N{{O}_{2}}\] |
| C. | \[{{N}_{2}}O.FeS{{O}_{4}}\] |
| D. | \[FeS{{O}_{4}}.NO\] |
| Answer» E. | |
| 9417. |
The number of electrons in an atom of an element is equal to its [BHU 1979] |
| A. | Atomic weight |
| B. | Atomic number |
| C. | Equivalent weight |
| D. | Electron affinity |
| Answer» C. Equivalent weight | |
| 9418. |
A catalyst is used [CPMT 1989] |
| A. | Only for increasing the velocity of the reaction |
| B. | For altering the velocity of the reaction |
| C. | Only for decreasing the velocity of the reaction |
| D. | All A, B and C are correct |
| Answer» E. | |
| 9419. |
Which of the following compounds of elements in group IV would you expect to be most ionic in character [NCERT 1978] |
| A. | \[CC{{l}_{4}}\] |
| B. | \[SiC{{l}_{4}}\] |
| C. | \[PbC{{l}_{2}}\] |
| D. | \[PbC{{l}_{4}}\] |
| Answer» D. \[PbC{{l}_{4}}\] | |
| 9420. |
The compounds that will give an isomer of 2; 2-dimethyl propane on catalytic hydrogenation are [AMU 1999] (1) \[C{{H}_{3}}CH=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\mathop{C\,\,-\,\,}}\,}}\,C{{H}_{3}}\] (2) \[C{{H}_{3}}CH=CHC{{H}_{3}}\] (3) \[\overset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\,\,\,\begin{matrix} {} & H \\ \end{matrix} \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,| \end{smallmatrix}}{\mathop{C{{H}_{3}}C}}\,=CHC{{H}_{2}}C{{H}_{3}}\] (4) \[C{{H}_{3}}\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{C\,\,\,}}\,=}}\,\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,}{\mathop{C\,}}\,-}}\,C{{H}_{3}}\] |
| A. | 1 and 4 |
| B. | 2 and 4 |
| C. | 1 and 3 |
| D. | 1 and 2 |
| Answer» D. 1 and 2 | |
| 9421. |
An endothermic reaction \[A\to B\] has an activation energy \[15\,kcal/mole\] and energy of reaction \[5\,kcal/mole\]. The activation energy of the reaction \[B\to A\] is [Pb. CET 1985] |
| A. | 20 kcal/mole |
| B. | 15 kcal/mole |
| C. | 10 kcal/mole |
| D. | None of these |
| Answer» D. None of these | |
| 9422. |
Which of the following is not a polymer [MP PET 2001] |
| A. | Silk |
| B. | DNA |
| C. | DDT |
| D. | Starch |
| Answer» D. Starch | |
| 9423. |
Addition of iron filings to \[CuS{{O}_{4}}\] solution caused precipitation of \[Cu\] owing to the [CPMT 1990] |
| A. | Reduction of \[C{{u}^{++}}\] |
| B. | Oxidation of \[C{{u}^{++}}\] |
| C. | Reduction of \[Fe\] |
| D. | Reduction of \[F{{e}^{+++}}\] |
| Answer» B. Oxidation of \[C{{u}^{++}}\] | |
| 9424. |
Gelatin is mixed in ice-cream |
| A. | As a coagulant |
| B. | For taste |
| C. | For colour |
| D. | As a protective colloid |
| Answer» E. | |
| 9425. |
\[_{84}P{{b}^{210}}{{\xrightarrow{{}}}_{82}}P{{b}^{206}}{{+}_{2}}H{{e}^{4}}\]. From the above equation, deduce the position of polonium in the periodic table (lead belongs to group IV A) [AIIMS 1980] |
| A. | II A |
| B. | IV B |
| C. | VI B |
| D. | VI A |
| Answer» E. | |
| 9426. |
The cell used for the electrolysis of fused \[NaCl\]is [AFMC 1999; Kerala (Mea.) 2002] |
| A. | Down?s cell |
| B. | Castner cell |
| C. | Solvay cell |
| D. | Nelson cell |
| Answer» B. Castner cell | |
| 9427. |
The colour of the precipitate produced by adding \[NaOH\] solution to \[HgC{{l}_{2}}\]is [KCET 1998] |
| A. | Yellow |
| B. | Black |
| C. | Brown |
| D. | White |
| Answer» B. Black | |
| 9428. |
Some substances behave as electrolytes in dilute solutions and as colloids in their concentrated solutions. Their colloidal forms are said to form [AMU 2002] |
| A. | Emulsions |
| B. | Gels |
| C. | Micelles |
| D. | Sols |
| Answer» D. Sols | |
| 9429. |
Which pair of substances gives same gaseous product, when these react with water [CBSE PMT 1994] |
| A. | \[Ca\] and \[Ca{{H}_{2}}\] |
| B. | \[Na\] and \[N{{a}_{2}}{{O}_{2}}\] |
| C. | \[K\] and \[K{{O}_{2}}\] |
| D. | \[Ba\] and \[Ba{{O}_{2}}\] |
| Answer» B. \[Na\] and \[N{{a}_{2}}{{O}_{2}}\] | |
| 9430. |
Gasoline has composition [AFMC 2004] |
| A. | \[{{C}_{8}}-{{C}_{12}}\] |
| B. | \[{{C}_{2}}-{{C}_{5}}\] |
| C. | \[{{C}_{6}}-{{C}_{11}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 9431. |
Solvay's process is used for the preparation of [CPMT 1982; AIIMS 1987] |
| A. | Ammonia |
| B. | Sodium bicarbonate |
| C. | Sodium carbonate |
| D. | Calcium carbonate |
| Answer» D. Calcium carbonate | |
| 9432. |
Washing soda is [CPMT 1982; DPMT 1982; CBSE PMT 1990; MP PMT 1987, 96] |
| A. | \[N{{a}_{2}}C{{O}_{3}}.\,10{{H}_{2}}O\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}.{{H}_{2}}O\] |
| C. | \[N{{a}_{2}}C{{O}_{3}}.\,5{{H}_{2}}O\] |
| D. | \[N{{a}_{2}}C{{O}_{3}}\] |
| Answer» B. \[N{{a}_{2}}C{{O}_{3}}.{{H}_{2}}O\] | |
| 9433. |
Sodium when heated in a current of dry ammonia gives [NCERT 1981; KCET 2000] |
| A. | Sodium nitrite |
| B. | Sodium hydride |
| C. | Sodium amide |
| D. | Sodium azide |
| Answer» D. Sodium azide | |
| 9434. |
Any precipitate is formed when [AIIMS 1982; DPMT 1985; KCET 1999; MP PMT 2004] |
| A. | Solution becomes saturated |
| B. | The value of ionic product is less that than the value of solubility product |
| C. | The value of ionic product is equal than the value of solubility product |
| D. | The value of ionic product is greater than the value of solubility product |
| Answer» E. | |
| 9435. |
Which one of the following is a hydrophobic sol [MP PET 1991] |
| A. | Starch solution |
| B. | Gum solution |
| C. | Protein solution |
| D. | Arsenic sulphide solution |
| Answer» E. | |
| 9436. |
Which among the following is the strongest o, p-directing group [CBSE PMT 1989] |
| A. | OH |
| B. | Cl |
| C. | \[{{C}_{6}}{{H}_{5}}\] |
| D. | Br |
| Answer» B. Cl | |
| 9437. |
The number of electrons in one molecule of \[C{{O}_{2}}\]are [IIT 1979; MP PMT 1994; RPMT 1999] |
| A. | 22 |
| B. | 44 |
| C. | 66 |
| D. | 88 |
| Answer» B. 44 | |
| 9438. |
Elements of which group form anions most readily [CBSE PMT 1992] |
| A. | Oxygen family |
| B. | Nitrogen group |
| C. | Halogens |
| D. | Alkali metals |
| Answer» D. Alkali metals | |
| 9439. |
The lanthanide contraction is responsible for the fact that [CBSE PMT 1997] |
| A. | Zr and Y have about the same radius |
| B. | Zr and Nb have similar oxidation state |
| C. | Zr and Hf have about the same radius |
| D. | Zr and Zn have the same oxidation state |
| Answer» D. Zr and Zn have the same oxidation state | |
| 9440. |
Gold number is [MP PET/PMT 1988] |
| A. | The number of mg of lyophilic colloid which should be added to 10 ml of ferric hydroxide sol so as to prevent its coagulation by the addition of 1 ml of 10% sodium chloride solution |
| B. | The number of mg of lyophilic colloid which should be added to 10 ml of standard gold sol so as to prevent its coagulation by the addition of 1 ml of 10% \[NaCl\] |
| C. | The mg of gold salt to be added to a lyophilic colloid to coagulate it |
| D. | The mg of an electrolyte required to coagulate a colloid |
| Answer» C. The mg of gold salt to be added to a lyophilic colloid to coagulate it | |
| 9441. |
Which of the following has a higher glass-transition temperature |
| A. | Polyethylene |
| B. | Polypropylene |
| C. | Polyvinylchloride |
| D. | Polystyrene |
| Answer» E. | |
| 9442. |
The main product obtained when a solution of sodium carbonate reacts with mercuric chloride is [KCET 2004] |
| A. | \[Hg{{(OH)}_{2}}\] |
| B. | \[HgC{{O}_{3}}.HgO\] |
| C. | \[HgC{{O}_{3}}\] |
| D. | \[HgC{{O}_{3}}.Hg{{(OH)}_{2}}\] |
| Answer» C. \[HgC{{O}_{3}}\] | |
| 9443. |
Which is the monomer of polypeptide |
| A. | Propene |
| B. | Butadiene |
| C. | Adipic acid |
| D. | Amino acid |
| Answer» E. | |
| 9444. |
Which of the following sulphides is yellow in colour [CPMT 1983, 88, 2004; NCERT 1976] |
| A. | CuS |
| B. | CdS |
| C. | ZnS |
| D. | CoS |
| Answer» C. ZnS | |
| 9445. |
Which of the following ions can cause coagulation of proteins [KCET 2000] |
| A. | \[A{{g}^{+}}\] |
| B. | \[N{{a}^{+}}\] |
| C. | \[M{{g}^{++}}\] |
| D. | \[C{{a}^{++}}\] |
| Answer» B. \[N{{a}^{+}}\] | |
| 9446. |
A catalyst [MNR 1987; UPSEAT 2002] |
| A. | Increases the free energy change in the reaction |
| B. | Decreases the free energy change in the reaction |
| C. | Does not increase or decrease the free energy change in the reaction |
| D. | Can either increase or decrease the free energy change depending on what catalyst we use |
| Answer» D. Can either increase or decrease the free energy change depending on what catalyst we use | |
| 9447. |
Bleeding is stopped by the application of ferric chloride. This is because |
| A. | Ferric chloride seal the blood cells. |
| B. | Blood starts flowing in the other direction |
| C. | Blood is coagulated and blood vessel is sealed |
| D. | None of these |
| Answer» D. None of these | |
| 9448. |
For purification of alumina, the modern processes most useful when (i) the impurity present is a lot of iron oxides and (ii) the impurity present is a lot of silica, are |
| A. | For (i) Hall's process; for (ii) Baeyer's process |
| B. | For (i) Hall's process; for (ii) Serpeck's process |
| C. | For (i) Serpeck's process; for (ii) Baeyer's process |
| D. | For (i) Baeyer's process; for (ii) Serpeck's process |
| Answer» E. | |
| 9449. |
In the Bessemer and open-hearth process for the manufacture of steel, which one of the following is used for the removal of carbon in part or whole |
| A. | Bessemer-Ferric Open-oxide hearth-Air |
| B. | Bessemer-Air Open-Ferric hearth-oxide |
| C. | Bessemer-Oxygen Open-Scrap hearth-iron |
| D. | Bessemer-Air Open-Scrap hearth-iron |
| Answer» E. | |
| 9450. |
\[Ca{{(OH)}_{2}}+{{H}_{3}}P{{O}_{4}}\to CaHP{{O}_{4}}+2{{H}_{2}}O\] the equivalent weight of \[{{H}_{3}}P{{O}_{4}}\] in the above reaction is [Pb. PMT 2004] |
| A. | 21 |
| B. | 27 |
| C. | 38 |
| D. | 49 |
| Answer» E. | |