MCQOPTIONS
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MCQOPTIONS
This section includes 1184 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Which compound shows hydrogen bonding ? |
| A. | C2H6 |
| B. | C2H5Cl |
| C. | CH3OCH3 |
| D. | C2H5OH |
| Answer» E. | |
| 252. |
Which compound is also known by the name of carbolic acid ? |
| A. | C2H2OH |
| B. | H2CO3 |
| C. | C6H5OH |
| D. | H3PO3 |
| Answer» D. H3PO3 | |
| 253. |
Which compound form benzoic acid on oxidation with acidified KMnO4 or K2Cr2O7 ? |
| A. | Toluene |
| B. | Ethyl benzene |
| C. | n-propyl benzene |
| D. | All |
| Answer» E. | |
| 254. |
which Compound Destroy The OZONE ? |
| A. | CFCs |
| B. | CH3COOH |
| C. | BOTH A & B |
| D. | None Of These |
| Answer» B. CH3COOH | |
| 255. |
Which catalyst is used in contact process ? |
| A. | Fe2O3 |
| B. | V2O5 |
| C. | SO3 |
| D. | Ag2O |
| Answer» C. SO3 | |
| 256. |
Which C-X bond has the highest bond energy per mole ? |
| A. | C-F |
| B. | C-C |
| C. | C-Br |
| D. | C-I |
| Answer» B. C-C | |
| 257. |
Which among the following is not a property of Ionic bond _________? |
| A. | Sharing of electrons |
| B. | Transfer of electrons |
| C. | Losing of electrons |
| D. | Gain of electrons |
| Answer» B. Transfer of electrons | |
| 258. |
Which allotropic form of phosphorous is the most stable ? |
| A. | White |
| B. | black |
| C. | red |
| D. | Violet |
| Answer» C. red | |
| 259. |
Which alkyl halide out of the following may follow both SN1 and SN2 mechanism ? |
| A. | CH3-X |
| B. | (CH3)3 C-CH2 – X |
| C. | (CH3)2 CH – X |
| D. | (CH3)3 C – X |
| Answer» D. (CH3)3 C – X | |
| 260. |
Which alkyl halide has the highest reactivity for a particular alkyl group ? |
| A. | R-F |
| B. | R-C |
| C. | R-Br |
| D. | R-I |
| Answer» E. | |
| 261. |
Which alcohol will undergo elimination reaction to give alkene in the presence of acidic potassium dichromate ? |
| A. | Primary alcohol |
| B. | Secondary alcohol |
| C. | Tertiary alcohol |
| D. | All of above |
| Answer» D. All of above | |
| 262. |
Which acid is the manufacture of synthetic rubber ? |
| A. | Acetic acid |
| B. | Formic acid |
| C. | Carbonic acid |
| D. | Benzoic acid |
| Answer» B. Formic acid | |
| 263. |
When water freezes at 0°C its density decreases due to_______________? |
| A. | Change of bond angles |
| B. | Cubic structure of ice |
| C. | Empty space present in the structure of ice |
| D. | Change of bond length |
| Answer» D. Change of bond length | |
| 264. |
When two moles of ethyl chloride react with two moles of sodium in the presence of ether what will be formed ? |
| A. | 2 moles of ethane |
| B. | 1 mole of ethane |
| C. | 2 moles of butane |
| D. | 1 mole of butane |
| Answer» E. | |
| 265. |
When toluene reacts with chlorine in sunlight the first major product is__________________? |
| A. | Benzy1 chloride |
| B. | Benzal dichloride |
| C. | O-chlorotoluene |
| D. | O-chlorotoluene and P-chlorotoluene |
| Answer» B. Benzal dichloride | |
| 266. |
When the value of Kc is very small then_______________________? |
| A. | reaction is at start |
| B. | product conc. Is maximum |
| C. | reactant conc. Is minimum |
| D. | reaction is completed |
| Answer» C. reactant conc. Is minimum | |
| 267. |
When the reaction completes in more than one steps rate of reaction will be determined by________________? |
| A. | Fast step |
| B. | Slowest step |
| C. | All steps |
| D. | Molecularity of the reaction |
| Answer» C. All steps | |
| 268. |
When the central atom of coordination compound is sp3d2 hybridization the expected geometry will be___________________? |
| A. | tetrahedral |
| B. | square planar |
| C. | trigonal bipyramidal |
| D. | octahedral |
| Answer» E. | |
| 269. |
When the atoms of third layer are arranged in such a way that they directly lie above the atoms of first layer then this arrangement is called_________________? |
| A. | ABAB (hexagonal) |
| B. | ABCABC (Cubic) |
| C. | Orthor hombic |
| D. | Rhombohedral |
| Answer» B. ABCABC (Cubic) | |
| 270. |
When sulphuric acid is treated with ethanol sulphuric acid behaves like________________? |
| A. | an acid |
| B. | a dehydrating agent |
| C. | an oxidizing agent |
| D. | as sulphonating agent |
| Answer» C. an oxidizing agent | |
| 271. |
When substance moves from a solid to a liquid state all of the following changes occur except__________________? |
| A. | Molecules become more disordered |
| B. | K.E of the molecules decreases |
| C. | Intermolecular forces become weaker |
| D. | Molecule become further separated |
| Answer» C. Intermolecular forces become weaker | |
| 272. |
When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called_________________? |
| A. | common ion effect |
| B. | solubility product |
| C. | dissociation constant |
| D. | dissociation constant for an acid |
| Answer» C. dissociation constant | |
| 273. |
When SO2 solution is passed over which of the following it turns green? |
| A. | K2Cr2O7 |
| B. | H2SO4 |
| C. | SO3 |
| D. | P2O5 |
| Answer» B. H2SO4 | |
| 274. |
When phenol is heated with concentrated nitric acid the product is________________? |
| A. | Picric acid |
| B. | o-nitrophenol |
| C. | 1 3 5 -trinitro benzene |
| D. | p-nitrophenol |
| Answer» B. o-nitrophenol | |
| 275. |
When one hydrogen atom of alkane is removed then it is called________________? |
| A. | alkene |
| B. | alkyl |
| C. | aldehyde |
| D. | saturated hydrocarbon |
| Answer» C. aldehyde | |
| 276. |
When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 277. |
When light is exposed to transition element then electrons jump from lower orbitals to higher orbitals in______________________? |
| A. | orbitals of f-subshell |
| B. | orbitals of d-subshell |
| C. | orbitals of p-subshell |
| D. | both A & B |
| Answer» E. | |
| 278. |
When enthalpy of reactants is higher than product then reaction will be_________________? |
| A. | endothermic |
| B. | spontaneous |
| C. | non-spontaneous |
| D. | exothermic |
| Answer» E. | |
| 279. |
When electron jump into orbit 1 then series obtained is___________________? |
| A. | Lyman |
| B. | Paschen |
| C. | Pfund |
| D. | Brackett |
| Answer» B. Paschen | |
| 280. |
When electrons collide with heavy metals than ___________ are produced? |
| A. | Beta-rays |
| B. | Alpha-rays |
| C. | X-rays |
| D. | Gamma-rays |
| Answer» D. Gamma-rays | |
| 281. |
When – COOH is attached directly to the benzene ring the acid is called__________________? |
| A. | Aliphatic |
| B. | Alicyclic |
| C. | Carboxylic |
| D. | Aromatic |
| Answer» E. | |
| 282. |
When common salt is dissolved in water ? |
| A. | Boiling point of water decrease |
| B. | Boiling point of water increase |
| C. | Boiling point of water remains same |
| D. | None of the above |
| Answer» C. Boiling point of water remains same | |
| 283. |
When CO2 is made to react with ethy1 magnesium iodide in dry ether followed by acid hydrolysis yields______________? |
| A. | Carboxylic acid |
| B. | Ethanoic acid |
| C. | Propanoic acid |
| D. | Butanoic acid |
| Answer» D. Butanoic acid | |
| 284. |
When chlorine is passed through hot solution of caustic soda the reaction is said as___________________? |
| A. | Displacement |
| B. | Reduction |
| C. | Disproportionation reaction |
| D. | Double displacement reaction |
| Answer» D. Double displacement reaction | |
| 285. |
When CO2 is made to react with ethyl magnesium iodide followed by acid hydrolysis the product formed is _________________? |
| A. | propane |
| B. | propanoic acid |
| C. | propanal |
| D. | propanol |
| Answer» C. propanal | |
| 286. |
When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________? |
| A. | lighter |
| B. | intermediate |
| C. | heavier |
| D. | are collected at same time |
| Answer» B. intermediate | |
| 287. |
When catalysts and reactants are in more than one phase it is________________? |
| A. | Homogeneous catalysis |
| B. | Heterogeneous catalysis |
| C. | Catalysis |
| D. | Ea |
| Answer» C. Catalysis | |
| 288. |
When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound ? |
| A. | Bromine |
| B. | Chlorine |
| C. | Fluorine |
| D. | Iodine |
| Answer» E. | |
| 289. |
When benzene is heated in air with V2O5 at 450°C yields_________________? |
| A. | Phenol |
| B. | Maleic anhydride |
| C. | Glyoxal |
| D. | Benzoic acid |
| Answer» C. Glyoxal | |
| 290. |
When aquious bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show ? |
| A. | phenol is unsaturated |
| B. | 2-bromophenol is insoluble in water |
| C. | a hydroxy group makes the benzene ring more susceptible to electrophilic attack |
| D. | acid-base reaction |
| Answer» D. acid-base reaction | |
| 291. |
When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is______________? |
| A. | 0.33 nm |
| B. | 0.34 nm |
| C. | 0.35 nm |
| D. | 0.36 nm |
| Answer» B. 0.34 nm | |
| 292. |
When an atom absorbs energy the lines in the spectrum will appear which are_________________? |
| A. | Brighter |
| B. | Darker |
| C. | Colourless |
| D. | Hard to locate |
| Answer» C. Colourless | |
| 293. |
When an aldehyde is reacted with hydrogen cyanide a ” Cyanihydrin” is formed. This process is best termed as __________? |
| A. | Electrophilic addition |
| B. | Electrophilic substitution |
| C. | Nucleophilic addition |
| D. | Necleophilic substitution |
| Answer» D. Necleophilic substitution | |
| 294. |
When an active metal like Al comes in contact with less active element like Cu then it produces__________________? |
| A. | dry cell |
| B. | galvanic cell |
| C. | electrolytic cell |
| D. | A and B |
| Answer» C. electrolytic cell | |
| 295. |
When Ammonia is used as a refrigerant in vapour compression cycle? |
| A. | Cu Tubing used |
| B. | Steel tubes used |
| C. | Both a & b |
| D. | Material does not effect by refrigerant |
| Answer» C. Both a & b | |
| 296. |
When alcohol reacts with phosphorous halides it geive____________________? |
| A. | alkyl halides |
| B. | alkyl amine |
| C. | alkanes |
| D. | alkynes |
| Answer» B. alkyl amine | |
| 297. |
When a graph is plotted between 1/T on X-axis and log k on y-axis a straight line is obtained with a negative slope which has two end in__________________? |
| A. | I and II quadrant |
| B. | II and III quadrant |
| C. | III and IV quadrant |
| D. | II and IV quadrant |
| Answer» E. | |
| 298. |
When a compound of transition element is dissolved in a solution of salt then it produces____________________? |
| A. | simples ions |
| B. | complex ions |
| C. | double salts |
| D. | strong anions |
| Answer» C. double salts | |
| 299. |
When 6d orbital is complete the entering electron goes into_________________? |
| A. | 7f |
| B. | 7s |
| C. | 7p |
| D. | 7d |
| Answer» D. 7d | |
| 300. |
When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |