MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Hydrated iron (III) is called |
| A. | oxide |
| B. | rust |
| C. | reducing agent |
| D. | hydroxide |
| Answer» C. reducing agent | |
| 2. |
In Redox reactions, electrons maybe |
| A. | gained only |
| B. | lost only |
| C. | shared |
| D. | gained and lost |
| Answer» E. | |
| 3. |
The type of molecular structure of beginning Period 3 elements is |
| A. | giant metallic structure |
| B. | giant molecules |
| C. | simple molecules |
| D. | individual atoms |
| Answer» B. giant molecules | |
| 4. |
Ca(s) + H₂O(l) → Ca(OH)₂(aq) + H₂(g). The product Ca(OH)₂ is |
| A. | highly soluble in water |
| B. | sparingly soluble in water |
| C. | insoluble in water |
| D. | sparingly insoluble in water |
| Answer» C. insoluble in water | |
| 5. |
Metal chloride that is hydrated is |
| A. | MgCl₂ |
| B. | Al₂Cl₃ |
| C. | PCl₅ |
| D. | SCl₂ |
| Answer» B. Al₂Cl₃ | |
| 6. |
Consider the reaction: P₄O₁₀(s) + H₂O (l) → H₃PO₄ (aq). The moles of H₂O required to balance equation will be |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 7. |
Sulphuric(VI) acid (H₂SO₄) is formed upon the reaction of H₂O and |
| A. | SO |
| B. | SO₂ |
| C. | S₂O₂ |
| D. | SO₃ |
| Answer» C. S₂O₂ | |
| 8. |
Without water, aluminum chloride exists as |
| A. | Al₂Cl₃ |
| B. | AlCl₃ |
| C. | Al₂Cl₆ |
| D. | Al₂O₃ |
| Answer» D. Al₂O₃ | |
| 9. |
The total of the oxidation number is an element's |
| A. | charge |
| B. | volatility |
| C. | reduction |
| D. | oxidation |
| Answer» B. volatility | |
| 10. |
Which metal is most vigorously hydrolyzed? |
| A. | Be |
| B. | Ca |
| C. | Sr |
| D. | Ba |
| Answer» E. | |
| 11. |
Metals are more reactive with oxygen |
| A. | left to right in a period |
| B. | right to left in a period |
| C. | down the Group-II |
| D. | up the Group-II |
| Answer» D. up the Group-II | |
| 12. |
The oxide used to treat indigestion and relieve pain is |
| A. | magnesium oxide (MgO) only |
| B. | magnesium hydroxide (Mg(OH)₂) only |
| C. | potassium oxide (K₂O) |
| D. | magnesium oxide (MgO) and magnesium hydroxide (Mg(OH) |
| Answer» E. | |
| 13. |
Aluminum oxide never react or dissolve in |
| A. | water |
| B. | alkali |
| C. | acid |
| D. | base |
| Answer» B. alkali | |
| 14. |
Higher positive oxidation numbers show that the atom is |
| A. | less oxidized |
| B. | more oxidized |
| C. | less reduced |
| D. | more reduced |
| Answer» C. less reduced | |
| 15. |
Compounds which can act as both acids and bases are called |
| A. | isotopes |
| B. | Amphoteric |
| C. | sublimates |
| D. | noble compounds |
| Answer» C. sublimates | |
| 16. |
The oxides of Al and Si are |
| A. | soluble in water |
| B. | reactive with water |
| C. | insoluble in water |
| D. | forms ions with water |
| Answer» D. forms ions with water | |
| 17. |
The oxidation number of S in SCl₂ is |
| A. | +2 |
| B. | +3 |
| C. | +4 |
| D. | +5 |
| Answer» B. +3 | |
| 18. |
Bromine water does not react with benzene at |
| A. | high temperature |
| B. | low temperature |
| C. | room temperature |
| D. | constant temperature |
| Answer» D. constant temperature | |
| 19. |
The oxidation number of Magnesium (Mg) in Magnesium Chloride (MgCl₂) is |
| A. | +2 |
| B. | +3 |
| C. | +4 |
| D. | +5 |
| Answer» B. +3 | |
| 20. |
Metal out of four given below, that reacts most vigorously with water is |
| A. | Mg |
| B. | Ca |
| C. | Zinc |
| D. | Nickel |
| Answer» C. Zinc | |
| 21. |
Atom is oxidizing agent decreases in oxidation number when nitric acid reacts as |
| A. | oxidizing agent |
| B. | reducing agent |
| C. | metal |
| D. | metalloid |
| Answer» B. reducing agent | |
| 22. |
The reduction is a gain of |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | oxygen |
| Answer» B. protons | |
| 23. |
Sulphuric (IV) acid is formed upon the reaction of H₂O and |
| A. | SO |
| B. | SO₂ |
| C. | S₂O₂ |
| D. | SO₃ |
| Answer» C. S₂O₂ | |
| 24. |
The fuel in space shuttle's rocket burns due to the occurrence of |
| A. | oxidation reaction |
| B. | reduction reaction |
| C. | re-dox reaction |
| D. | catalysis |
| Answer» D. catalysis | |
| 25. |
Ionic Chlorides of which of these do not react with water |
| A. | SiCl₄ |
| B. | MgCl₂ |
| C. | PCl₅ |
| D. | SCl₂ |
| Answer» C. PCl₅ | |
| 26. |
Upon oxidation, Strontium compounds give |
| A. | brick red color |
| B. | scarlet /violet color |
| C. | apple green color |
| D. | yellow color |
| Answer» C. apple green color | |
| 27. |
The oxidation number of Al in Al₂Cl₆ is |
| A. | +1 |
| B. | +2 |
| C. | +3 |
| D. | +4 |
| Answer» D. +4 | |
| 28. |
Comparing, Phenol reacts readily than the benzene, so it is a |
| A. | nucleophiles |
| B. | electrophile |
| C. | protophile |
| D. | none of above |
| Answer» C. protophile | |
| 29. |
An Oxidation number can be |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | all of above |
| Answer» E. | |
| 30. |
The oxidation number for oxygen will always be |
| A. | 2 |
| B. | −2 |
| C. | 1 |
| D. | -1 |
| Answer» C. 1 | |
| 31. |
Upon hydration of Al₂Cl₆, Al⁺³ is formed, and the solution becomes |
| A. | acidic |
| B. | basic |
| C. | catalyst |
| D. | neutral (pH: 7) |
| Answer» B. basic | |
| 32. |
The dimer of AlCl₃ is |
| A. | Al₂Cl₃ |
| B. | AlCl |
| C. | Al₂Cl₆ |
| D. | dimer of AlCl₃ does not exist |
| Answer» D. dimer of AlCl₃ does not exist | |
| 33. |
Consider the reaction: SiCl₄(l) + 2H₂O(l) → SiO₂ + HCl. The color of SiO₂ is |
| A. | pink precipitate |
| B. | white precipitate |
| C. | blue precipitate |
| D. | red precipitate |
| Answer» C. blue precipitate | |
| 34. |
Less vitamins and valuable nutrients are destroyed if the |
| A. | smaller particles are cooked |
| B. | larger food particles are cooked |
| C. | if food is frozen |
| D. | if food is fried |
| Answer» B. larger food particles are cooked | |
| 35. |
Change of orange color of Chromium(VI) (Cr+6) to green color of Chromium(III) (Cr+3) indicates presence of a |
| A. | reducing agent |
| B. | oxidizing agent |
| C. | reagent |
| D. | drying agent |
| Answer» B. oxidizing agent | |
| 36. |
Metals are good at |
| A. | accepting electrons |
| B. | donating electrons |
| C. | insulation |
| D. | producing electricity |
| Answer» C. insulation | |
| 37. |
In Copper Oxide (CuO) and Carbon Monoxide (CO) reaction, oxidizing agent is |
| A. | CuO |
| B. | CO |
| C. | Cu |
| D. | CO₂ |
| Answer» B. CO | |
| 38. |
Oxide with very high relative melting point is |
| A. | Na₂O |
| B. | MgO |
| C. | Al₂O₃ |
| D. | SiO₂ |
| Answer» D. SiO₂ | |
| 39. |
Element to oxidize with low oxidation state needs |
| A. | high energy |
| B. | less energy |
| C. | constant energy |
| D. | no energy |
| Answer» C. constant energy | |
| 40. |
The lowest relative melting point among the four oxides is of |
| A. | SO₂ (g) |
| B. | SO₃ |
| C. | P₄O₁₀ |
| D. | all of above |
| Answer» E. | |
| 41. |
After accepting electrons, Manganate Mn(VII) ion becomes oxidized to |
| A. | Mn (VI) ions |
| B. | Mn (V) |
| C. | Mn(III) ions |
| D. | Mn(II) ions |
| Answer» E. | |
| 42. |
In electrolysis of copper purification, at cathode |
| A. | pure copper gets deposited |
| B. | the object to be electroplated is kept |
| C. | impure copper gets deposited |
| D. | CuSO₄ gets deposited |
| Answer» B. the object to be electroplated is kept | |
| 43. |
Reaction of Lead Oxide (PbO) and Hydrogen Gas (H₂) leads to |
| A. | reduction of Lead |
| B. | oxidation of Lead |
| C. | formation of PbCl₂ |
| D. | formation of PbO |
| Answer» C. formation of PbCl₂ | |
| 44. |
Displacement reaction occurs when |
| A. | a more reactive non-metal displaces less reactive non-metals |
| B. | a more reactive metal displaces a less reactive metal |
| C. | metal lower in reactivity series is added |
| D. | both a and b |
| Answer» E. | |
| 45. |
The solution is turned acidic upon hydration of AlCl₃, because |
| A. | Al⁺³ ions are formed |
| B. | Cl⁻ are formed |
| C. | H⁺ ions are formed |
| D. | none of above |
| Answer» D. none of above | |
| 46. |
The oxidation number of Si in SiCl₄ is |
| A. | +2 |
| B. | +3 |
| C. | +4 |
| D. | +5 |
| Answer» D. +5 | |
| 47. |
In S₂Cl₂, the oxidation number is |
| A. | +1 |
| B. | +2 |
| C. | +3 |
| D. | +4 |
| Answer» B. +2 | |
| 48. |
Reducing agents does not include |
| A. | chlorine |
| B. | carbon |
| C. | potassium iodide |
| D. | carbon monoxide |
| Answer» B. carbon | |
| 49. |
At high temperatures, enzymes... |
| A. | act very rapidly |
| B. | get denatured |
| C. | form cations |
| D. | form anions |
| Answer» C. form cations | |
| 50. |
When dichromate (VI) ion becomes reduced to chromium (III) ion, a change of color occurs from |
| A. | purple to pink |
| B. | purple to colorless |
| C. | orange to purple |
| D. | orange to green |
| Answer» E. | |