MCQOPTIONS
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MCQOPTIONS
This section includes 150 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Water may act as |
| A. | acid only |
| B. | base only |
| C. | alkalis |
| D. | acid and base |
| Answer» E. | |
| 2. |
The nuclear charge increases in periodic table |
| A. | across periods |
| B. | down group |
| C. | d-block |
| D. | s-block |
| Answer» B. down group | |
| 3. |
Metals and non-metals combine to give the electronic configuration of |
| A. | alkalis |
| B. | noble gases |
| C. | metalloids |
| D. | acids |
| Answer» C. metalloids | |
| 4. |
Electrons are usually lost by |
| A. | metals |
| B. | non-metals |
| C. | inert gases |
| D. | transition metals |
| Answer» B. non-metals | |
| 5. |
Electrons always reside in certain energy level outside |
| A. | nucleus |
| B. | axis |
| C. | zone |
| D. | lobe |
| Answer» B. axis | |
| 6. |
After ionic salts come in contact with water, they form bonds called |
| A. | ion-dipole bonds |
| B. | ionic bonds |
| C. | co-ordinate bonds |
| D. | dative bonds |
| Answer» B. ionic bonds | |
| 7. |
The value of ionic product of water is |
| A. | 198K |
| B. | 298K |
| C. | 928K |
| D. | 892K |
| Answer» C. 928K | |
| 8. |
Oxide with ionic and covalent nature of bonding is |
| A. | MgO |
| B. | SiO₂ |
| C. | Na₂O |
| D. | Al₂O₃ |
| Answer» E. | |
| 9. |
When magnesium reacts with oxygen, the nature of the bond formed is |
| A. | ionic |
| B. | covalent |
| C. | metallic |
| D. | dative |
| Answer» B. covalent | |
| 10. |
Replaceable hydrogen atoms in H₂SO₄ are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 11. |
The force of repulsion between electron pairs causes to remove electron with less |
| A. | heat |
| B. | energy |
| C. | light |
| D. | electric path |
| Answer» C. light | |
| 12. |
Insoluble Sulphates are |
| A. | CaSO₄ |
| B. | BaSO₄ |
| C. | CuSO₄ |
| D. | PbSO₄ |
| Answer» D. PbSO₄ | |
| 13. |
In Calcium chloride (CaCl₂), chloride (Cl⁻) gains |
| A. | one electron |
| B. | two electrons |
| C. | three electrons |
| D. | four electrons |
| Answer» C. three electrons | |
| 14. |
The ionic radius of cation will be smaller and more efficient in polarizing |
| A. | carbonate ion |
| B. | carbonate molecule |
| C. | hydrogen ion |
| D. | water |
| Answer» B. carbonate molecule | |
| 15. |
The energy released by gaseous ions when dissolving in water is called enthalpy change of |
| A. | solution |
| B. | hydration |
| C. | atomization |
| D. | electron affinity |
| Answer» C. atomization | |
| 16. |
In Calcium chloride, Calcium and chloride ions gain the electronic configuration of |
| A. | hydrogen(g) |
| B. | Helium(g) |
| C. | Neon(g) |
| D. | Argon(g) |
| Answer» E. | |
| 17. |
The chloride ion (Cl⁻) have the same configuration as |
| A. | neon |
| B. | helium |
| C. | argon |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 18. |
The force of attraction between nucleus and electrons increases across periods because |
| A. | nuclear charge increases |
| B. | distance remains constant |
| C. | shielding effect constant |
| D. | all of above |
| Answer» E. | |
| 19. |
In CO₂ molecule, the number of electrons in valence shell around the Carbon atom are |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 20. |
Distortion of the electron cloud of an ion results in |
| A. | ion polarization |
| B. | charge polarization |
| C. | atomic polarization |
| D. | electronegativity polarization |
| Answer» B. charge polarization | |
| 21. |
Al₂Cl₆ is an example of |
| A. | covalent bonds |
| B. | electrovalent bonds |
| C. | dative covalent bonds |
| D. | double covalent bonds |
| Answer» D. double covalent bonds | |
| 22. |
Group II nitrates decompose to give off |
| A. | oxide |
| B. | nitrogen dioxide |
| C. | oxygen |
| D. | all of above |
| Answer» E. | |
| 23. |
The degree of polarization depends on |
| A. | charge density of cations only |
| B. | polarizability only |
| C. | charge density of anions |
| D. | charge density of cations and polarizability |
| Answer» E. | |
| 24. |
The specific Redox reaction of chlorine is known as |
| A. | disproportionation |
| B. | oxidation |
| C. | reduction |
| D. | redox chlorination |
| Answer» B. oxidation | |
| 25. |
The formation of ammonium NH₄ is an example of |
| A. | covalent bonds |
| B. | electrovalent bonds |
| C. | dative covalent bonds |
| D. | double covalent bonds |
| Answer» D. double covalent bonds | |
| 26. |
While forming magnesium oxide (MgO), magnesium |
| A. | looses one electron |
| B. | looses more than one electron |
| C. | gains one electron |
| D. | gains more than one electrons |
| Answer» C. gains one electron | |
| 27. |
The electronic configuration of electrons involves their addition starting from lowest energy level to |
| A. | highest energy level |
| B. | adjacent high energy levels |
| C. | closer to nucleus |
| D. | closer to protons |
| Answer» C. closer to nucleus | |
| 28. |
Disproportionation refers to |
| A. | self oxidation only |
| B. | self reduction only |
| C. | cross oxidation |
| D. | self oxidation and reduction |
| Answer» E. | |
| 29. |
After Neon (Ne), the enthalpy change of vaporization is highest in |
| A. | Helium (He) |
| B. | Xenon (Xe) |
| C. | Krypton (Kr) |
| D. | Argon (Ar) |
| Answer» C. Krypton (Kr) | |
| 30. |
The noble gas electron configuration was first suggested by |
| A. | Walther Kossel |
| B. | Gilbert Lewis |
| C. | John Dalton |
| D. | Isaac Newton |
| Answer» B. Gilbert Lewis | |
| 31. |
On ionizing, water molecules (H₂O) the products include |
| A. | H⁺ ion only |
| B. | OH⁻ ion only |
| C. | oxygen |
| D. | H⁺ and OH⁻ ions |
| Answer» E. | |
| 32. |
Strong acids completely ionize in |
| A. | alcohol |
| B. | water |
| C. | gases |
| D. | alkalis |
| Answer» C. gases | |
| 33. |
Bonds formed by sharing four electrons are |
| A. | covalent bonds |
| B. | electrovalent bonds |
| C. | dative covalent bonds |
| D. | double covalent bonds |
| Answer» E. | |
| 34. |
In Al₂Cl₆, the number of electron pairs donated by each Chloride ion are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 35. |
Lattice energy is inversely proportional to sum of radii of |
| A. | anion only |
| B. | cation only |
| C. | ions |
| D. | anion and cation |
| Answer» E. | |
| 36. |
There is less attraction between the fifth electron of Boron and nucleus, hence that electron resides in |
| A. | 1s |
| B. | 2p |
| C. | 3s |
| D. | 4d |
| Answer» C. 3s | |
| 37. |
Resulting a loss of electrons (e⁻) forms |
| A. | positive ions |
| B. | negative ions |
| C. | cathodes |
| D. | anodes |
| Answer» B. negative ions | |
| 38. |
Intermolecular forces are |
| A. | very weak |
| B. | very strong |
| C. | weak at room temperature |
| D. | strong at room temperature |
| Answer» B. very strong | |
| 39. |
The electronic configuration is evident by the successive |
| A. | ionization energies |
| B. | polarity |
| C. | electronegativity |
| D. | shielding effect |
| Answer» B. polarity | |
| 40. |
Metal atoms usually lose electrons and form |
| A. | positive ions |
| B. | negative ions |
| C. | new atoms |
| D. | radioactive ions |
| Answer» B. negative ions | |
| 41. |
The magnitude of ionization energy depends upon |
| A. | number of positive charges |
| B. | shielding effect increases |
| C. | spin pair repulsion |
| D. | all of above |
| Answer» E. | |
| 42. |
Acid salt formed by H₃PO₄ and Ca₃(PO₄)₂ is |
| A. | disodium hydrogen phosphate Na₂HPO₄ |
| B. | sodium hydrogen phosphate NaHPO₄ |
| C. | disodium hydrophosphite Na₂HPO₃ |
| D. | disodium chloro phosphate Na₂ClPO₄ |
| Answer» B. sodium hydrogen phosphate NaHPO₄ | |
| 43. |
Compound that has an expanded octet is |
| A. | SF₆ |
| B. | BF₃ |
| C. | Al₂Cl₆ |
| D. | AlBF₃ |
| Answer» B. BF₃ | |
| 44. |
The ionization energy between last element of one period and first element of next period receives a rapid |
| A. | increase |
| B. | decrease |
| C. | constancy |
| D. | neutral |
| Answer» C. constancy | |
| 45. |
When metals combine with non-metals, |
| A. | hydrogen gas is given off |
| B. | electrons of the outer shells are shared |
| C. | electrons in the outer shells of metals are transferred to the non-metals atoms |
| D. | electrons in the outer shells of non-metals are transferred to the metals atoms |
| Answer» D. electrons in the outer shells of non-metals are transferred to the metals atoms | |
| 46. |
An anion will be polarized if |
| A. | cations is small only |
| B. | anion is large only |
| C. | cation is large |
| D. | cation is small and anion is large |
| Answer» E. | |
| 47. |
Ions have noble gas electronic configuration' was suggested by |
| A. | Kossel |
| B. | Lewis |
| C. | Newton |
| D. | Russell |
| Answer» B. Lewis | |
| 48. |
Many ionic compounds have some covalent ability due to |
| A. | ion polarization |
| B. | charge polarization |
| C. | proton polarization |
| D. | electron polarization |
| Answer» B. charge polarization | |
| 49. |
The electrons required for bonding between NH₃ and hydrogen ion are provided by |
| A. | Nitrogen |
| B. | Hydrogen |
| C. | Water |
| D. | Oxygen |
| Answer» B. Hydrogen | |
| 50. |
Each atom (Cl) in a Chlorine molecule (Cl₂) has three lone electrons and |
| A. | one pair of shared electrons |
| B. | two pairs of shared electrons |
| C. | three pairs of shared electrons |
| D. | none of above |
| Answer» B. two pairs of shared electrons | |