MCQOPTIONS
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MCQOPTIONS
This section includes 106 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In fractionating column of fractional distillation, higher in the column |
| A. | the temperature becomes higher |
| B. | the temperature becomes lower |
| C. | risks of sublimation exists |
| D. | minimum absorption is carried out |
| Answer» C. risks of sublimation exists | |
| 2. |
Phosphoric acid has the formula |
| A. | H2PO4 |
| B. | H2PO3 |
| C. | H3PO3 |
| D. | H3PO4 |
| Answer» E. | |
| 3. |
Upon heating either of the carbonate, hydroxide or nitrate, a common byproduct is |
| A. | water vapors |
| B. | Heat |
| C. | carbon dioxide |
| D. | oxides of same compounds |
| Answer» E. | |
| 4. |
In Universal indicators, weak acids are represented through a color of |
| A. | Orange |
| B. | Reddish orange |
| C. | all of these |
| D. | Yellow |
| Answer» D. Yellow | |
| 5. |
In Universal indicators, a pH of 11 to 14 is indicated through |
| A. | violet color |
| B. | turquoise color |
| C. | light violet color |
| D. | blue color |
| Answer» B. turquoise color | |
| 6. |
Consider the equation: Ca+2 (aq) + 2OH- (aq) → Ca(OH)2 (s). The precipitate of calcium hydroxide will be of |
| A. | blue color |
| B. | green color |
| C. | white color |
| D. | brown color |
| Answer» D. brown color | |
| 7. |
Common salt is |
| A. | alkaline |
| B. | acidic |
| C. | basic |
| D. | neutral |
| Answer» E. | |
| 8. |
In Universal indicators, weak alkalis are indicated through a pH of |
| A. | 8 to 10 |
| B. | 4 to 7 |
| C. | 7 to 14 |
| D. | 10 to 14 |
| Answer» B. 4 to 7 | |
| 9. |
The way atoms join together and combine with one another is called as |
| A. | alloys |
| B. | isotopes |
| C. | diatic bond |
| D. | bonding |
| Answer» E. | |
| 10. |
Naturally occurring elements are |
| A. | 92 |
| B. | 82 |
| C. | above 100 by now |
| D. | 99 |
| Answer» B. 82 | |
| 11. |
In the electrolysis of aqueous copper sulphate CuSO4, at cathode |
| A. | hydrogen gas is given off |
| B. | pink deposit of copper metal is deposited |
| C. | Cu+2 forms crystals |
| D. | hydrogen ions are easier to discharge than copper ions |
| Answer» C. Cu+2 forms crystals | |
| 12. |
The unit for volumes does not include |
| A. | cdm |
| B. | ccm |
| C. | tones |
| D. | liters |
| Answer» D. liters | |
| 13. |
An oxidant |
| A. | accepts electrons |
| B. | gives oxygen |
| C. | None of Above |
| D. | Both A and B |
| Answer» E. | |
| 14. |
In plenty of space, natural movement of particles occur due to |
| A. | osmotic pressure |
| B. | concentration gradient |
| C. | active transport |
| D. | diffusion |
| Answer» E. | |
| 15. |
Ionic crystals are non-conductors of electricity as |
| A. | they share strong electrostatic forces |
| B. | they are in fixed positions |
| C. | they lack crystal lattices |
| D. | they have van der Walls forces |
| Answer» B. they are in fixed positions | |
| 16. |
H2SO3 is the formula of |
| A. | Sulphuric acid |
| B. | Sulphatic acid |
| C. | sulphite acid |
| D. | Sulphourous acid |
| Answer» E. | |
| 17. |
Consider the equation PbO + NaOH + H2O → Na2Pb(OH)4. The balancing of equation requires how much moles of NaOH? |
| A. | 2 |
| B. | 1 |
| C. | 4 |
| D. | 3 |
| Answer» B. 1 | |
| 18. |
Oil and water is an example of |
| A. | impure substances may also form the crystals |
| B. | miscible |
| C. | suspension |
| D. | filtrate |
| Answer» B. miscible | |
| 19. |
At 100 °C, the speed of reaction becomes |
| A. | 64 times faster |
| B. | 16 times faster |
| C. | 148 times faster |
| D. | 128 times faster |
| Answer» E. | |
| 20. |
In neutralization reactions, conductivity meters are an ideal choice |
| A. | to measure and remove the H+ and OH- ions |
| B. | to record change in pH |
| C. | to measure the amount of current flowing |
| D. | to record heat given out |
| Answer» B. to record change in pH | |
| 21. |
The formula of nitric acid is |
| A. | HNO2 |
| B. | H(NO3)2 |
| C. | H2NO4 |
| D. | HNO3 |
| Answer» E. | |
| 22. |
After centrifugation when the sublimate settles, the clear liquid |
| A. | can be allowed to form crystals |
| B. | can be allowed to rest |
| C. | None of Above |
| D. | can be decanted off |
| Answer» E. | |
| 23. |
Examples of sublimate does not include |
| A. | nitrates |
| B. | ammonium salts |
| C. | naphthalene |
| D. | iodine |
| Answer» E. | |
| 24. |
In an atom, adding number of protons and neutrons |
| A. | number of nucleons can be obtained |
| B. | number of electrons can be obtained |
| C. | None of Above |
| D. | Both A and B |
| Answer» B. number of electrons can be obtained | |
| 25. |
Chlorine relative atomic mass is 35.5. this half number is due to |
| A. | a half proton |
| B. | isotopes |
| C. | a half electron |
| D. | a half neutron |
| Answer» C. a half electron | |
| 26. |
In a reaction between CuSO4(s) and Zn(s), |
| A. | undergoes oxidation |
| B. | Zinc experiences an increase in the oxidation state |
| C. | all of these |
| D. | Zinc undergoes oxidation |
| Answer» D. Zinc undergoes oxidation | |
| 27. |
Colored gas includes |
| A. | chlorine |
| B. | ammonia |
| C. | hydrogen |
| D. | hydrogen chloride |
| Answer» B. ammonia | |
| 28. |
The pH of 7 is shown through a color of |
| A. | blue |
| B. | red |
| C. | yellow |
| D. | green |
| Answer» E. | |
| 29. |
Toothpaste has an average pH of |
| A. | 4 |
| B. | 0 |
| C. | 12 |
| D. | 8 |
| Answer» E. | |
| 30. |
In vacuum distillation, the substance boils at |
| A. | temperature slightly above its boiling point |
| B. | its exact temperature |
| C. | under high pressures |
| D. | a temperature below its boiling point |
| Answer» E. | |
| 31. |
NH4Cl(s) + NaOH → |
| A. | Na2CO3.(H2O)5 + HCl |
| B. | Na2CO3 + H2+NO2 |
| C. | NaCl + HNO3 |
| D. | NaCl + H2O + NH3 |
| Answer» E. | |
| 32. |
Purity of a substance can be estimated through |
| A. | melting points |
| B. | boiling points |
| C. | Both A and B |
| D. | None of These |
| Answer» D. None of These | |
| 33. |
Electrodes may be made up of metals like |
| A. | Silver |
| B. | Gold |
| C. | Manganese |
| D. | Graphite |
| Answer» E. | |
| 34. |
In polarization, the positive side attracts the |
| A. | the positive side of the water molecules |
| B. | negative side of the water molecules |
| C. | metals of group VII |
| D. | the substance dissolves completely in water |
| Answer» C. metals of group VII | |
| 35. |
Non-conductors include |
| A. | plastics |
| B. | non-metals |
| C. | None of Above |
| D. | Both A and B |
| Answer» E. | |
| 36. |
In Na2CO3, the relative atomic mass of Oxygen is |
| A. | 24 |
| B. | 12 |
| C. | 48 |
| D. | 36 |
| Answer» D. 36 | |
| 37. |
Smallest particle of a compound is |
| A. | electrons |
| B. | atom |
| C. | all of these |
| D. | molecules |
| Answer» E. | |
| 38. |
On burning, hydrogen is changed into |
| A. | water vapors |
| B. | hydroxides |
| C. | hydrogen gas |
| D. | dilute acids |
| Answer» B. hydroxides | |
| 39. |
Reaction of Carbon(s) with O2(g) is an example of |
| A. | Thermal decomposition |
| B. | combustion |
| C. | Respiration |
| D. | Neutralization |
| Answer» C. Respiration | |
| 40. |
In neutralization reactions, for data logging |
| A. | gas syringe shall be used |
| B. | biosensors should be used |
| C. | heat sensors should be used |
| D. | conductivity meters shall be used |
| Answer» E. | |
| 41. |
Giant crystal lattices are only formed in |
| A. | covalent compounds |
| B. | ionic compounds |
| C. | diatic bond |
| D. | metallic compounds |
| Answer» C. diatic bond | |
| 42. |
Elements in group V are likely to form |
| A. | covalent bonds |
| B. | ionic bonds |
| C. | diatic bond |
| D. | metallic bonds |
| Answer» B. ionic bonds | |
| 43. |
Consider the equation: Cu+2 (aq) + 2OH- (aq) → Cu(OH)2 (s). The precipitate of copper hydroxide will be of |
| A. | blue color |
| B. | green color |
| C. | white color |
| D. | brown color |
| Answer» B. green color | |
| 44. |
An ionic equation chemical reaction |
| A. | the states of reactants and products are mentioned as transcripts |
| B. | symbolically represents all ions in the |
| C. | all of these |
| D. | aqueous elements are shown as the ions it produces in solution |
| Answer» E. | |
| 45. |
The best indicator of all is |
| A. | universal indicator |
| B. | litmus indicator |
| C. | Phenolphthalein indicators |
| D. | methyl orange indicator |
| Answer» B. litmus indicator | |
| 46. |
In Na2CO3.10H2O, percentage of sodium is |
| A. | 0.1608 |
| B. | 0.1678 |
| C. | 0.1684 |
| D. | 0.1659 |
| Answer» B. 0.1678 | |
| 47. |
H2SO4 is the formula of |
| A. | Sulphuric acid |
| B. | Sulphatic acid |
| C. | None of Above |
| D. | Sulphourous acid |
| Answer» B. Sulphatic acid | |
| 48. |
Sugar is |
| A. | alkaline |
| B. | acidic |
| C. | None of Above |
| D. | neutral |
| Answer» E. | |
| 49. |
The metal that burns even more brightly than magnesium is |
| A. | mercury |
| B. | zinc |
| C. | diamond |
| D. | zirconium |
| Answer» E. | |
| 50. |
The valency of Plumbum can be |
| A. | 4 or 6 |
| B. | 2 or 4 |
| C. | 2 or 3 |
| D. | 3 or 5 |
| Answer» C. 2 or 3 | |