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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.
| 351. |
Optically active isomers but not mirror images are called [MP PET 1999] |
| A. | Enantiomers |
| B. | Mesomers |
| C. | Tautomers |
| D. | Diastereoisomers |
| Answer» E. | |
| 352. |
Sodium nitroprusside when added to an alkaline solution of sulphide ions produce a [AFMC 2005] |
| A. | Red colouration |
| B. | Blue colouration |
| C. | Purple colouration |
| D. | Brown colouration |
| Answer» D. Brown colouration | |
| 353. |
The species which acts as a Lewis acid but not a Bronsted acid is [MP PMT 1999; Kurukshetra CET 2002] |
| A. | \[NH_{2}^{-}\] |
| B. | \[{{O}^{2-}}\] |
| C. | \[B{{F}_{3}}\] |
| D. | \[O{{H}^{-}}\] |
| Answer» D. \[O{{H}^{-}}\] | |
| 354. |
Which one of the following statement is true for a electrochemical cell [Pb. PMT 1999; KCET 1999] |
| A. | \[{{H}_{2}}\]is cathode and \[Cu\] is anode |
| B. | \[{{H}_{2}}\] is anode and \[Cu\] is cathode |
| C. | Reduction occurs at \[{{H}_{2}}\]electrode |
| D. | Oxidation occurs at \[Cu\] electrode |
| Answer» C. Reduction occurs at \[{{H}_{2}}\]electrode | |
| 355. |
Which of the following is not a disproportionate reaction? |
| A. | \[4KCl{{O}_{3}}\xrightarrow[{}]{{}}3KCl{{O}_{4}}+KCl\] |
| B. | \[2C{{u}^{+}}\xrightarrow[{}]{{}}C{{u}^{2+}}+Cu\] |
| C. | \[5{{X}^{-}}+XO_{3}^{-}+6{{H}^{+}}\xrightarrow[{}]{{}}3{{X}_{2}}+3{{H}_{2}}O\] |
| D. | \[4P+3NaOH+3{{H}_{2}}O\to \]\[P{{H}_{3}}+3Na{{H}_{2}}P{{O}_{2}}\] |
| Answer» D. \[4P+3NaOH+3{{H}_{2}}O\to \]\[P{{H}_{3}}+3Na{{H}_{2}}P{{O}_{2}}\] | |
| 356. |
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (at. wt. of Fe =56) present in one molecule of haemoglobin is |
| A. | 6 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» E. | |
| 357. |
The efficiency of an enzyme in catalysing a reaction is due to its capacity [NCERT 1982] |
| A. | To form a strong enzyme-substrate complex |
| B. | To decrease the bond energies of substrate molecule |
| C. | To change the shape of the substrate molecule |
| D. | To lower the activation energy of the reaction |
| Answer» E. | |
| 358. |
Maximum coagulation power is in [MP PET 1989, 90] |
| A. | \[N{{a}^{+}}\] |
| B. | \[B{{a}^{++}}\] |
| C. | \[A{{l}^{+++}}\] |
| D. | \[S{{n}^{++++}}\] |
| Answer» E. | |
| 359. |
The empirical formula of a compound composed of 38.4% potassium, 36.3% oxygen, 23.7% carbon and 1.66% hydrogen is determined to be |
| A. | \[~K{{C}_{2}}{{H}_{5}}{{O}_{4}}\] |
| B. | \[{{K}_{3}}{{C}_{6}}{{H}_{5}}{{O}_{7}}\] |
| C. | \[{{K}_{2}}CH{{O}_{3}}\] |
| D. | \[{{K}_{6}}{{C}_{4}}{{H}_{5}}{{O}_{7}}\] |
| Answer» C. \[{{K}_{2}}CH{{O}_{3}}\] | |
| 360. |
Which of the following is known as freon which is used as a refrigerant [DPMT 1982; CPMT 1979, 81, 89; AFMC 1995; Manipal MEE 1995; MP PET 1995, 2004] |
| A. | \[CC{{l}_{2}}{{F}_{2}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[C{{H}_{2}}{{F}_{2}}\] |
| D. | \[C{{F}_{4}}\] |
| Answer» B. \[CHC{{l}_{3}}\] | |
| 361. |
An aqueous solution of an inorganic salt on treatment with HCl gives a white precipitate. This solution contains [MP PMT 2001] |
| A. | \[H{{g}_{2}}^{+2}\] |
| B. | \[H{{g}^{2+}}\] |
| C. | \[Z{{n}^{2+}}\] |
| D. | \[C{{d}^{2+}}\] |
| Answer» B. \[H{{g}^{2+}}\] | |
| 362. |
Of the following, the compound possessing optical isomerism [Kerala (Med.) 2003] |
| A. | \[C{{H}_{3}}C{{H}_{2}}OH\] |
| B. | \[C{{H}_{3}}CHClBr\] |
| C. | \[CC{{l}_{2}}BrF\] |
| D. | \[CC{{l}_{2}}{{F}_{2}}\] |
| Answer» C. \[CC{{l}_{2}}BrF\] | |
| 363. |
The solubility of silver chromate in 0.01 M \[{{K}_{2}}Cr{{O}_{4}}\] is \[2\times {{10}^{-8}}mol\,d{{m}^{-3}}\]. The solubility product of silver chromate will be [MH CET 2000] |
| A. | \[8\times {{10}^{-24}}\] |
| B. | \[16\times {{10}^{-24}}\] |
| C. | \[1.6\times {{10}^{-18}}\] |
| D. | \[16\times {{10}^{-18}}\] |
| Answer» E. | |
| 364. |
Which of the following statement is wrong [EAMCET 2003] |
| A. | Diethyl ketone and methyl propyl ketone are position isomers |
| B. | 2-chloro pentane and 1-chloro pentane are position isomers |
| C. | n-butane and 2-methyl propane are chain isomers |
| D. | Acetone and propinaldehyde are functional isomers |
| Answer» B. 2-chloro pentane and 1-chloro pentane are position isomers | |
| 365. |
If 20 ml of 0.25 N strong acid and 30 ml of 0.2 N of strong base are mixed, then the resulting solution is [KCET 2002] |
| A. | 0.25 N basic |
| B. | 0.2 N acidic |
| C. | 0.25 N acidic |
| D. | 0.2 N basic |
| Answer» E. | |
| 366. |
Match list I with list II and select the correct answer using the codes given below the lists [SCRA 2001] List I List II 1. Heavy water Bicarbonates of Mg and Ca in water 2. Temporary hard water No foreign ions in water 3. Soft water \[{{D}_{2}}O\] 4. Permanent hard water Sulphates and chlorides of Mg and Ca in water Codes |
| A. | 1-c, 2-d, 3-b, 4-a |
| B. | 1-b, 2-a, 3-c, 4-d |
| C. | 1-b, 2-d, 3-c, 4-a |
| D. | 1-c, 2-a, 3-b, 4-d |
| Answer» E. | |
| 367. |
The \[H-O-H\] angle in water molecule is about [AFMC 2001] |
| A. | \[90{}^\circ \] |
| B. | \[180{}^\circ \] |
| C. | \[102{}^\circ \] |
| D. | \[105{}^\circ \] |
| Answer» E. | |
| 368. |
The standard heat of combustion of Al is - 837.8 kJ/mol at \[25{}^\circ C\]. Which of the following releases 250 kcal of heat? |
| A. | The reaction of 0.624 mol of Al |
| B. | The formation of 0.624 mol of \[A{{l}_{2}}{{O}_{3}}\] |
| C. | The reaction of 0.312 mol of \[Al\] |
| D. | The formation of 0.150 mol of \[A{{l}_{2}}{{O}_{3}}\] |
| Answer» C. The reaction of 0.312 mol of \[Al\] | |
| 369. |
Which of the following is a cyclic phosphate? |
| A. | \[{{H}_{3}}{{P}_{3}}{{O}_{10}}\] |
| B. | \[{{H}_{6}}{{P}_{4}}{{O}_{13}}\] |
| C. | \[{{H}_{5}}{{P}_{5}}{{O}_{15}}\] |
| D. | \[{{H}_{7}}{{P}_{5}}{{O}_{16}}\] |
| Answer» D. \[{{H}_{7}}{{P}_{5}}{{O}_{16}}\] | |
| 370. |
Hydrogen of 'N' in \[N(Si{{H}_{3}})\] is |
| A. | \[s{{p}^{2}}\] |
| B. | \[s{{p}^{3}}\] |
| C. | sp |
| D. | Nis unhybridised |
| Answer» B. \[s{{p}^{3}}\] | |
| 371. |
\[CO\] has same electrons as or the ion that is isoelectronic with \[CO\] is [CPMT 1984; IIT 1982; EAMCET 1990; CBSE PMT 1997] |
| A. | \[N_{2}^{+}\] |
| B. | \[C{{N}^{-}}\] |
| C. | \[O_{2}^{+}\] |
| D. | \[O_{2}^{-}\] |
| Answer» C. \[O_{2}^{+}\] | |
| 372. |
A 5% solution of cane sugar (molar mass 342) is isotonic with 1% of a solution of an unknown solute. The molar mass of unknown solute in g /mol is |
| A. | 136.2 |
| B. | 171.2 |
| C. | 68.4 |
| D. | 34.2 |
| Answer» D. 34.2 | |
| 373. |
\[N{{H}_{4}}Cl\] is acidic, because: |
| A. | on hydrolysis, \[N{{H}_{4}}Cl\] gives weak base \[N{{H}_{4}}OH\] and strong acid \[HCl\] |
| B. | nitrogen donates a pair of electron |
| C. | it is a salt of weak acid and strong base |
| D. | on hydrolysis, \[N{{H}_{4}}Cl\] gives strong base and weak acid |
| Answer» B. nitrogen donates a pair of electron | |
| 374. |
The equation \[\Delta x.\Delta p\ge \frac{h}{4\pi }\] shows [MP PET 2000] |
| A. | de-Broglie relation |
| B. | Heisenberg?s uncertainty principle |
| C. | Aufbau principle |
| D. | Hund?s rule |
| Answer» C. Aufbau principle | |
| 375. |
Water is a [KCET 2002] |
| A. | Amphoteric acid |
| B. | Aprotic solvent |
| C. | Protophobic solvent |
| D. | None of these |
| Answer» E. | |
| 376. |
Vitamin A is present in [MP PET 1995, 2000] |
| A. | Cod liver oil |
| B. | Carrot |
| C. | Milk |
| D. | In all of these |
| Answer» E. | |
| 377. |
For the cell \[Pt|{{H}_{2}}(g)|\] solution \[X||KCI\] (saturated) \[|H{{g}_{2}}C{{l}_{2}}|Hg|\,Pt\] the observed EMF at \[25{}^\circ C\] was \[600\text{ }mV.\] When solution X was replaced by a standard phosphate buffer with \[pH=7.00,\] the EMF was \[777\text{ }mV\]. Find the pH of solution X. |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 378. |
The freezing point of a solution composed of 10.0 g of KCl in 100 g of water is \[4.5{}^\circ C\]. Calculate the van't Hoff factor, i for this solution. |
| A. | 2.5 |
| B. | 1.8 |
| C. | 1.2 |
| D. | 1.3 |
| Answer» C. 1.2 | |
| 379. |
Which of the following pairs of ions when mixed in dilute solutions may give precipitate [CPMT 1976; NCERT 1987; Kurukshetra CEE 1998] |
| A. | \[N{{a}^{+}},SO_{4}^{2-}\] |
| B. | \[NH_{4}^{+},CO_{3}^{2-}\] |
| C. | \[N{{a}^{+}},{{S}^{2-}}\] |
| D. | \[F{{e}^{3+}},PO_{4}^{3-}\] |
| Answer» E. | |
| 380. |
The change in optical rotation, with time, of freshly prepared solution of sugar is known as [CPMT 1982, 85; BHU 1997] |
| A. | Rotatory motion |
| B. | Inversion |
| C. | Specific rotation |
| D. | Mutarotation |
| Answer» E. | |
| 381. |
The charring of sugar, when treated with conc. \[{{H}_{2}}S{{O}_{4}},\] is due to [Pb. CET 2002] |
| A. | Oxidation |
| B. | Reduction |
| C. | Dehydration |
| D. | Hydrolysis |
| Answer» D. Hydrolysis | |
| 382. |
Tyndall effect is shown by [Pb. PMT 1999] |
| A. | Sol |
| B. | Solution |
| C. | Plasma |
| D. | Precipitation |
| Answer» B. Solution | |
| 383. |
Energy is stored in our body in the form of [CBSE PMT 2001; KCET 2003] |
| A. | ATP |
| B. | ADP |
| C. | Fats |
| D. | Carbohydrates |
| Answer» B. ADP | |
| 384. |
The number of enantiomers of the compound \[C{{H}_{3}}CHBrCHBrCOOH\] is [AIIMS 1997] |
| A. | 0 |
| B. | 1 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 385. |
The isomers which can be converted into another forms by rotation of the molecules around single bond are [AIIMS 1997] |
| A. | Geometrical isomers |
| B. | Conformers |
| C. | Enantiomers |
| D. | Diastereomers |
| Answer» C. Enantiomers | |
| 386. |
When \[{{H}_{2}}S\] gas is passed into a certain solution, it reacts to form a white precipitate. The solution referred to contains ions of [EAMCET 1979] |
| A. | Lead |
| B. | Zinc |
| C. | Copper |
| D. | Nickel |
| Answer» C. Copper | |
| 387. |
\[HSO_{4}^{-}\] is the conjugate base of [NCERT 1977] |
| A. | \[{{H}^{+}}\] |
| B. | \[{{H}_{2}}S{{O}_{3}}\] |
| C. | \[SO_{4}^{2-}\] |
| D. | \[{{H}_{2}}S{{O}_{4}}\] |
| Answer» E. | |
| 388. |
Deficiency of which vitamin causes rickets [MP PET 2002] |
| A. | Vitamin-D |
| B. | Vitamin-B |
| C. | Vitamin-A |
| D. | Vitamin-K |
| Answer» B. Vitamin-B | |
| 389. |
Identify the statement which is not correct regarding copper sulphate [UPSEAT 2001] |
| A. | It reacts with KI to give iodine |
| B. | It reacts with KCl to give \[C{{u}_{2}}C{{l}_{2}}\] |
| C. | It reacts with\[NaOH\]and glucose to give\[C{{u}_{2}}O\] |
| D. | It gives\[CuO\]on strong heating in air |
| Answer» C. It reacts with\[NaOH\]and glucose to give\[C{{u}_{2}}O\] | |
| 390. |
Ionization potential of hydrogen atom is 13. 6eV. Hydrogen atom in ground state are excited by monochromatic light of energy 12.1 eV. The spectral lines emitted by hydrogen according to Bohr's theory will be |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» D. four | |
| 391. |
A saturated solution of \[A{{g}_{2}}S{{O}_{4}}\]is \[2.5\times {{10}^{-2}}\]M; The value of its solubility product is [Pb.CET 2004] |
| A. | \[62.5\times {{10}^{-6}}\] |
| B. | \[6.25\times {{10}^{-4}}\] |
| C. | \[15.625\times {{10}^{-6}}\] |
| D. | \[3.125\times {{10}^{-6}}\] |
| Answer» B. \[6.25\times {{10}^{-4}}\] | |
| 392. |
Glucose is a [CPMT 1984] |
| A. | Monosaccharide |
| B. | Disaccharide |
| C. | Trisaccharide |
| D. | Polysaccharide |
| Answer» B. Disaccharide | |
| 393. |
Separating of d and l enantiomorphs from a racemic mixture is called [CBSE PMT 1988; DPMT 1983; KCET 2002] |
| A. | Resolution |
| B. | Dehydration |
| C. | Rotation |
| D. | Dehydrohalogenation |
| Answer» B. Dehydration | |
| 394. |
Number of optical isomers of lactic acid are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 395. |
What are the products formed in the reaction of xenon hexafluoride with silicon dioxide? |
| A. | \[XeSi{{O}_{4}}+HF\] |
| B. | \[Xe{{F}_{2}}+Si{{F}_{4}}\] |
| C. | \[XeO{{F}_{4}}+Si{{F}_{4}}\] |
| D. | \[Xe{{O}_{3}}+Si{{F}_{2}}\] |
| Answer» D. \[Xe{{O}_{3}}+Si{{F}_{2}}\] | |
| 396. |
What atomic number of an element "X" would have to become so that the 4th orbit around X would fit inside the I Bohr orbit of H atom? |
| A. | 3 |
| B. | 4 |
| C. | 16 |
| D. | 25 |
| Answer» D. 25 | |
| 397. |
?The position and velocity of a small particle like electron cannot be simultaneously determined.? This statement is [NCERT 1979; BHU 1981, 87] |
| A. | Heisenberg uncertainty principle |
| B. | Principle of de Broglie's wave nature of electron |
| C. | Pauli's exclusion principle |
| D. | Aufbau's principle |
| Answer» B. Principle of de Broglie's wave nature of electron | |
| 398. |
\[2g\] of oxygen contains number of atoms equal to that in [BHU 1992] |
| A. | \[0.5g\] of hydrogen |
| B. | \[4g\] of sulphur |
| C. | \[7g\] of nitrogen |
| D. | \[2.3g\] of sodium |
| Answer» C. \[7g\] of nitrogen | |
| 399. |
The standard state gibbs free energy change for the given isomerization reaction cis-2-pentene ⇌ trans ?2 -pentene is \[-3.67\,kJ/mol\] at \[400K\]. If more trans-2-pentene is added to the reaction vessel, then [CBSE PMT 1995; BHU 1999; AFMC 2000] |
| A. | More cis ?2?pentene is formed |
| B. | Equilibrium is shifted in the forward direction |
| C. | Equilibrium remains unaffected |
| D. | Additional trans?2?pentene is formed |
| Answer» B. Equilibrium is shifted in the forward direction | |
| 400. |
What is the volume of 0.1 N-HCl required to react completely with 1.0 gm of pure calcium carbonate? [DPMT 2004] |
| A. | \[100\,c{{m}^{3}}\] |
| B. | \[150\,c{{m}^{3}}\] |
| C. | \[250\,c{{m}^{3}}\] |
| D. | \[200\,c{{m}^{3}}\] |
| Answer» E. | |