MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 40 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. |
I ? A elements are named as alkali metals because |
| A. | Their oxides are basic |
| B. | Their oxide and hydroxides are water soluble |
| C. | Both a & b |
| D. | They are found in earth |
| Answer» D. They are found in earth | |
| 2. |
The word Alkali means |
| A. | Base |
| B. | Basic salt |
| C. | Ashes |
| D. | Spirit |
| Answer» D. Spirit | |
| 3. |
Formula of Chile saltpetre is |
| A. | NaNO3 |
| B. | CaCO3 |
| C. | Ba (NO3)2 |
| D. | NH4Cl |
| Answer» B. CaCO3 | |
| 4. |
The oxides of beryllium BeO is |
| A. | Acidic |
| B. | Basic |
| C. | Amphoteric |
| D. | Neutral |
| Answer» D. Neutral | |
| 5. |
The elements which are very abundant in earth crust are |
| A. | Si & A? |
| B. | Ca & Mg |
| C. | B & A? |
| D. | All |
| Answer» B. Ca & Mg | |
| 6. |
Which element is necessary for normal leaf development? |
| A. | Si |
| B. | Ba |
| C. | Mg |
| D. | Ca |
| Answer» E. | |
| 7. |
Li is different from its family members due to |
| A. | Small size |
| B. | High charge density |
| C. | Less electropositivity |
| D. | All of the above |
| Answer» E. | |
| 8. |
Carbonates of lithium are not stable like that of sodium due to |
| A. | Low electronegativity |
| B. | Low electropositivity |
| C. | Low charge density |
| D. | Not known yet |
| Answer» C. Low charge density | |
| 9. |
Nitrates of which pair of elements give different products on thermal decomposition? |
| A. | Na K |
| B. | Mg Ca |
| C. | Li Na |
| D. | Li Ca |
| Answer» D. Li Ca | |
| 10. |
Which one of the following is not an alkali metal? |
| A. | Francium |
| B. | Caesium |
| C. | Rubidium |
| D. | Radium |
| Answer» E. | |
| 11. |
Which of the following sulphates is not soluble in water? |
| A. | Sodium sulphate |
| B. | Potassium sulphate |
| C. | Zinc sulphate |
| D. | Barium sulphate |
| Answer» E. | |
| 12. |
The element cesium bears resemblance with |
| A. | Ca |
| B. | Cr |
| C. | Both of the above |
| D. | None of the above |
| Answer» E. | |
| 13. |
Sodium is not observed in +2 oxidation state because of its |
| A. | High first ionization potential |
| B. | High second ioniation potential |
| C. | High ionic radius |
| D. | High electronegativity |
| Answer» C. High ionic radius | |
| 14. |
Carnalite has chemical formula |
| A. | KCI |
| B. | KCI.MgCl2.6H2O |
| C. | Na2B4O7.10H2O |
| D. | CaCO3.MgCO3 |
| Answer» C. Na2B4O7.10H2O | |
| 15. |
Magnesium metal does not burn in the vessel containing |
| A. | N2 |
| B. | O2 |
| C. | N2 and O2 |
| D. | Ne |
| Answer» E. | |
| 16. |
Electrolysis of dilute solution of NaCl results at the anode |
| A. | Sodium |
| B. | Hydrogen |
| C. | Chlorine |
| D. | Oxygen |
| Answer» E. | |
| 17. |
Second ionization potential of alkali metals are very high due to |
| A. | Being s-block elements |
| B. | Inert gas configurations |
| C. | Ns1 electronic configuration |
| D. | Being metals |
| Answer» C. Ns1 electronic configuration | |
| 18. |
Which ion will have maximum value of heat of hydration? |
| A. | A1+3 |
| B. | Cs+ |
| C. | Ba+ |
| D. | Mg+2 |
| Answer» B. Cs+ | |
| 19. |
Which one can form complex? |
| A. | Na |
| B. | Cr |
| C. | Li |
| D. | K |
| Answer» D. K | |
| 20. |
Which one is natron? |
| A. | Na2CO3 |
| B. | Na2CO3.10H2O |
| C. | Na2CO3.H2O |
| D. | NaHCO3 |
| Answer» D. NaHCO3 | |
| 21. |
Addition of 2% gypsum in cement |
| A. | Triggers hydration |
| B. | Triggers hydrolysis |
| C. | Prevents rapid hardening |
| D. | All of the above |
| Answer» D. All of the above | |
| 22. |
Which one is least ionic in nature and decompose on heating. |
| A. | LiOH |
| B. | NaOH |
| C. | KOH |
| D. | CsOH |
| Answer» B. NaOH | |
| 23. |
Ammonia may be prepared by heating ammonium chloride with |
| A. | Water |
| B. | NaCl |
| C. | Aqueous sodium hydroxide |
| D. | H2SO4 |
| Answer» D. H2SO4 | |
| 24. |
Calcium carbide is prepared by heating lime with coke at |
| A. | 2500?C |
| B. | 2600?C |
| C. | 2700?C |
| D. | 2800?C |
| Answer» E. | |
| 25. |
Crystals of Na2CO3. 10H2O when exposed to air |
| A. | Lose water and remain solid |
| B. | Gain water and remain solid |
| C. | Gain water and become liquid |
| D. | Remains unchanged |
| Answer» B. Gain water and remain solid | |
| 26. |
Which one of the following substances conducts electricity by the movement of ions? |
| A. | Graphite |
| B. | Copper |
| C. | Molten sodium chloride |
| D. | Mercury |
| Answer» D. Mercury | |
| 27. |
Which one of the following gives white precipitate with aqueous solution of BaC?2? |
| A. | NaHCO3 |
| B. | NaNO3 |
| C. | Na2CO3 |
| D. | Na2CrO4 |
| Answer» D. Na2CrO4 | |
| 28. |
Which one of the following carbonate is water insoluble? |
| A. | Na2CO3 |
| B. | K2CO3 |
| C. | (NH4)2CO3 |
| D. | CaCO3 |
| Answer» E. | |
| 29. |
The deliquescence is a property in which a solid |
| A. | Absorbs moisture and remains solid |
| B. | Absorbs moisture and turns to liquid form |
| C. | Loses water of crystallization |
| D. | Increases the number of water of crystallization |
| Answer» C. Loses water of crystallization | |
| 30. |
In diaphragm cell hydrogen is discharged by the reduction of |
| A. | Water |
| B. | HCI |
| C. | Na+ |
| D. | NaCl |
| Answer» B. HCI | |
| 31. |
In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents |
| A. | Hydroxide ions to reach anode |
| B. | Chlorine gas to mix |
| C. | Cathode to decay |
| D. | All of the above |
| Answer» B. Chlorine gas to mix | |
| 32. |
Gypsum is applied to the soil as a source of |
| A. | Ca and P |
| B. | S and P |
| C. | Ca and S |
| D. | We could not apply |
| Answer» D. We could not apply | |
| 33. |
Alkali and alkaline earth metals impart colours when heated over burner. It is due to |
| A. | Smaller electronegativity of alkali metals |
| B. | Smaller ionic radius of these metals |
| C. | De-excitation of electrons from higher energy levels to low energy level |
| D. | Excitation of electrons from low energy levels to higher energy levels |
| Answer» D. Excitation of electrons from low energy levels to higher energy levels | |
| 34. |
First ionization potential of alkaline earth metal is greater than alkali metals because |
| A. | They are more reactive |
| B. | They have greater atomic radii |
| C. | They have smaller atomic sizes |
| D. | All |
| Answer» D. All | |
| 35. |
Which one of the following alkali metals forms only normal oxide when it reacts with O2? |
| A. | Lithium |
| B. | Sodium |
| C. | Potassium |
| D. | Rubidium |
| Answer» B. Sodium | |
| 36. |
Which one of the following pairs shown diagonal relationship in the periodic table? |
| A. | Sodium and Lithium |
| B. | Lithium and magnesium |
| C. | Lithium and beryllium |
| D. | Boron and Beryllium |
| Answer» C. Lithium and beryllium | |
| 37. |
NaOH is named as caustic soda because |
| A. | It corrodes the organic tissues |
| B. | It is used in soda water |
| C. | It reacts with chlorine gas |
| D. | It reacts with fats to form soap |
| Answer» B. It is used in soda water | |
| 38. |
Which element is produced at the cathode during the electrolysis of brine in Nelsons cell? |
| A. | H2 |
| B. | Na |
| C. | C?2 |
| D. | O2 |
| Answer» B. Na | |
| 39. |
The ore CaSO4.H2O has the general name |
| A. | Gypsum |
| B. | Dolomite |
| C. | Calcite |
| D. | Plaster of Paris |
| Answer» B. Dolomite | |
| 40. |
Downs cell is used to prepare |
| A. | Sodium carbonate |
| B. | Sodium bicarbonate |
| C. | Sodium metal |
| D. | Sodium hydroxide |
| Answer» D. Sodium hydroxide | |