MCQOPTIONS
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MCQOPTIONS
This section includes 1262 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Atomic number of Mn is 25 what is the electronic configuration in the ground state________________? |
| A. | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ |
| B. | 1s² 2s² 2p6 3s² 3p⁶ 4s² 4p⁵ |
| C. | 1s² 2s² 2p⁶ 3s² 3p⁵ 3d10 |
| D. | 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²3d⁵ |
| Answer» E. | |
| 2. |
Three quantum number have been derived from equation of____________________? |
| A. | de-Broglie |
| B. | Plancks |
| C. | Schrodinger |
| D. | Heisenberg |
| Answer» D. Heisenberg | |
| 3. |
The rectified spirit is________________? |
| A. | 12% alcohol |
| B. | 90% alcohol |
| C. | 95% alcohol |
| D. | 100% alcohol |
| Answer» D. 100% alcohol | |
| 4. |
Which is not heterocyclic compound _______________? |
| A. | Furan |
| B. | Thiophene |
| C. | Aniline |
| D. | Pyridine |
| Answer» D. Pyridine | |
| 5. |
What do we call to sudden expansion of plasma ? |
| A. | Avogadros law |
| B. | Grahams law of diffusion |
| C. | Joule Thompson effect |
| D. | Daltons law of partial pressure |
| Answer» D. Daltons law of partial pressure | |
| 6. |
Which one of the following is most acidic? |
| A. | Phenol |
| B. | P-nitrophenol |
| C. | O-nitrophenol |
| D. | M-nitrophenol |
| Answer» C. O-nitrophenol | |
| 7. |
In unsaturated hydrocarbons electrons favour___________________? |
| A. | less reactivity |
| B. | addition reactions |
| C. | substitution reactions |
| D. | none |
| Answer» C. substitution reactions | |
| 8. |
Removal of halogen and hydrogen atom is_________________? |
| A. | halogenation |
| B. | dehalogenation |
| C. | dehydrohalogenation |
| D. | hydrohalogenation |
| Answer» D. hydrohalogenation | |
| 9. |
Force responsible to hold atoms together in a compound is called ________________? |
| A. | Bond |
| B. | Attractive force |
| C. | Interaction |
| D. | All of above represent same entity |
| Answer» B. Attractive force | |
| 10. |
A specie with maximum number of unpaired electrons ? |
| A. | F |
| B. | H2O |
| C. | HF |
| D. | NH-2 |
| Answer» E. | |
| 11. |
Which of the following is not use of compounds of Fluorine________________? |
| A. | SbF3 is used for manufacture of pottery |
| B. | Sodium fluoroacetate is a rat poison |
| C. | Cu F2 is used in ceramic industry |
| D. | None of the above |
| Answer» E. | |
| 12. |
In a period the atomic radius ? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | First decreases then increases |
| Answer» C. Remain same | |
| 13. |
Energy required to remove electron from an atom______________? |
| A. | Ionization potential |
| B. | Electronegativity |
| C. | Electron affinity |
| D. | Activation energy |
| Answer» B. Electronegativity | |
| 14. |
Greater shielding effect corresponds to ionization energy value___________________? |
| A. | Greater |
| B. | Lesser |
| C. | Remain same |
| D. | No effect |
| Answer» C. Remain same | |
| 15. |
The geometry of ammonia is___________________? |
| A. | Tetrahedral |
| B. | Square planner |
| C. | Trigonal bipyramidal |
| D. | Trigonal Pyramidal |
| Answer» E. | |
| 16. |
Energy released or absorbed when electrons are added in atom is_________________? |
| A. | Ionization potential |
| B. | Electronegativity |
| C. | Electron affinity |
| D. | Activation energy |
| Answer» D. Activation energy | |
| 17. |
Elements of group IA IIA are _________________? |
| A. | Electronegative |
| B. | Electropositive |
| C. | Neutral |
| D. | IA is electropositive while IIA is electronegative |
| Answer» C. Neutral | |
| 18. |
Periodic table provides a basic framework to study elements with respect to their__________________? |
| A. | Physical properties |
| B. | Chemical properties |
| C. | Properties of their compounds |
| D. | All |
| Answer» E. | |
| 19. |
The Lewis acids are__________________? |
| A. | Electron deficient |
| B. | Electron rich |
| C. | Octet is complete |
| D. | No such acids exist |
| Answer» B. Electron rich | |
| 20. |
Mostly ionic compound are produced in between elements of_________________? |
| A. | IA and VIA |
| B. | IA IIA and VIIA |
| C. | IB and VIIB |
| D. | IA and IB |
| Answer» C. IB and VIIB | |
| 21. |
Saponification is the hydrolysis of fat or oil with an__________________? |
| A. | Acid |
| B. | Alkali |
| C. | Enzyme and alkali |
| D. | Enzyme and acid |
| Answer» C. Enzyme and alkali | |
| 22. |
Metallic characters of alkali metals_____________________? |
| A. | Increase down the group |
| B. | Decrease down the group |
| C. | No regular trend |
| D. | Remain same |
| Answer» B. Decrease down the group | |
| 23. |
Beckmanns apparatus is used to measure_______________? |
| A. | boiling point elevation |
| B. | depression in freezing point |
| C. | lowering of vapour pressure |
| D. | lowering of osmotic pressure |
| Answer» C. lowering of vapour pressure | |
| 24. |
In a galvanic cell________________? |
| A. | Chemical energy is converted into electricity |
| B. | Chemical energy is converted into heat |
| C. | Electrical energy is converted into chemical energy |
| D. | Electrical energy is converted into heat |
| Answer» B. Chemical energy is converted into heat | |
| 25. |
Which of the following is not an ester_________________? |
| A. | amyl acetate |
| B. | sodium butyrate |
| C. | isobutyle formate |
| D. | octyl acetate |
| Answer» C. isobutyle formate | |
| 26. |
The PH of Tears is __________? |
| A. | 7.0 |
| B. | 7.4 |
| C. | 7.8 |
| D. | 8.2 |
| Answer» C. 7.8 | |
| 27. |
Which element was not known when Mendeleev proposed his classification ? |
| A. | Hydrogen |
| B. | Sodium |
| C. | Copper |
| D. | Germanium |
| Answer» E. | |
| 28. |
Which one of the following is not a semiconductor ? |
| A. | Si |
| B. | Ge |
| C. | Se |
| D. | Sn |
| Answer» E. | |
| 29. |
In which compound of Xenon the oxidation state of Xenon is + 6? |
| A. | XeF4 |
| B. | XeOF4 |
| C. | XeOF2 |
| D. | Na4XeO6 |
| Answer» C. XeOF2 | |
| 30. |
What will be the pressure of 1 mole of an ideal gas maintained at 300 K and 250cm3 volume ? |
| A. | 98.5 atm |
| B. | 96.7 atm |
| C. | 95.8 atm |
| D. | 97.1 atm |
| Answer» B. 96.7 atm | |
| 31. |
Higher value of electron affinity means__________________? |
| A. | Atom will lose electron easily |
| B. | Atom will gain electron easily |
| C. | Atom may form di-positive ion |
| D. | The reason is unknown |
| Answer» C. Atom may form di-positive ion | |
| 32. |
Nitration of chlorobenzene gives___________________? |
| A. | o – chloronitrobenzene |
| B. | p – chloronitrobenzene |
| C. | m – chloronitrobenzene |
| D. | A & B |
| Answer» E. | |
| 33. |
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 | |
| 34. |
The IUPAC name of pyridines is__________? |
| A. | Azolo |
| B. | Azine |
| C. | Azolidins |
| D. | Diazine |
| Answer» C. Azolidins | |
| 35. |
The location of transition elements is in between__________________? |
| A. | lanthanides & actinides |
| B. | s and p block elements |
| C. | chalcogens and halogens |
| D. | d and f block elements |
| Answer» C. chalcogens and halogens | |
| 36. |
Which of the following represents the correct electronic configuration of VII A group elements in the ground state ? |
| A. | ns2p2 |
| B. | ns2p4 |
| C. | ns2p5 |
| D. | ns2p6 |
| Answer» D. ns2p6 | |
| 37. |
Chemical composition of cinnabar is____________________? |
| A. | FeS2 |
| B. | HgS |
| C. | PbS |
| D. | ZnS |
| Answer» C. PbS | |
| 38. |
Paramagnetic behaviour of substance is measured by a balance called___________________? |
| A. | Analytical balance |
| B. | Guoys balance |
| C. | Electrical balance |
| D. | Single beam balance |
| Answer» C. Electrical balance | |
| 39. |
Octane number can be improved by________________? |
| A. | Isomerization |
| B. | Adding (C2H5)4 Pb |
| C. | Adding (CH3)4 Pb |
| D. | All |
| Answer» E. | |
| 40. |
Which is the unit of (K) rate constant for zero order reaction ? |
| A. | s-1 |
| B. | mol dm-3 s-1 |
| C. | mol-1 dm3 s-1 |
| D. | mol-2 dm6 s-1 |
| Answer» C. mol-1 dm3 s-1 | |
| 41. |
Enthalpy change can be_________________? |
| A. | calculated by Hess law |
| B. | can be measured by calorimeter |
| C. | both A and B |
| D. | none |
| Answer» D. none | |
| 42. |
When enthalpy of reactants is higher than product then reaction will be_________________? |
| A. | endothermic |
| B. | spontaneous |
| C. | non-spontaneous |
| D. | exothermic |
| Answer» E. | |
| 43. |
Qualitative analysis is carried out for _________________? |
| A. | identification of elements |
| B. | estimation of amounts of elements |
| C. | molar ration of elements |
| D. | molar volume of elements |
| Answer» B. estimation of amounts of elements | |
| 44. |
Which one of the following has highest volatility_________________? |
| A. | Diethyl ether |
| B. | Ethyl alcohol |
| C. | Water |
| D. | Ethylene glycol |
| Answer» B. Ethyl alcohol | |
| 45. |
Forces of attraction which may be present between all kinds of atoms and molecules are _____________________? |
| A. | intramolecular |
| B. | intermolecular |
| C. | van der Waal |
| D. | Dipole-induced dipole |
| Answer» D. Dipole-induced dipole | |
| 46. |
A solid may be made up of_________________? |
| A. | Atoms |
| B. | Ions |
| C. | Molecules |
| D. | A, B, and C |
| Answer» E. | |
| 47. |
Which of the following is a substance? |
| A. | Sea water |
| B. | Brass |
| C. | Tape water |
| D. | Graphite |
| E. | Sand |
| Answer» E. Sand | |
| 48. |
Hydrogen bonding is involved in____________________? |
| A. | Solubility |
| B. | Cleansing action of detergents |
| C. | Biological molecules |
| D. | All |
| Answer» E. | |
| 49. |
The mass of decimole of electrons (NA) is___________________? |
| A. | 1.008 mg |
| B. | 0.184 mg |
| C. | 0.054 mg |
| D. | 5.4 mg |
| Answer» D. 5.4 mg | |
| 50. |
The soul of chemistry is dealing with___________? |
| A. | Internal structural changes in matter |
| B. | Composition of matter |
| C. | Properties of matter |
| D. | Composition and properties of matter |
| Answer» E. | |