MCQOPTIONS
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MCQOPTIONS
This section includes 229 Mcqs, each offering curated multiple-choice questions to sharpen your Grade9 knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
As we move across the period from left to right, the reactivity of metals with oxygen |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | zero |
| Answer» B. increases | |
| 2. |
As we move across the period the electronegativity |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | becomes zero |
| Answer» C. remains same | |
| 3. |
The most metallic among the following is |
| A. | Na |
| B. | K |
| C. | Al |
| D. | B |
| Answer» C. Al | |
| 4. |
On contact with oxygen, Rubidium forms |
| A. | normal oxide |
| B. | per oxide |
| C. | super oxide |
| D. | trioxide |
| Answer» D. trioxide | |
| 5. |
Metal that difficult to oxidize are called |
| A. | weak metals |
| B. | strong metals |
| C. | noble metals |
| D. | ionic metals |
| Answer» D. ionic metals | |
| 6. |
An electrolytic cell uses electrical energy to drive |
| A. | chemical reaction |
| B. | physical reaction |
| C. | no reaction |
| D. | biochemical reaction |
| Answer» B. physical reaction | |
| 7. |
The electrolyte used for tin plating is |
| A. | sulphide ore |
| B. | stannous sulphate |
| C. | hydrogen sulphate |
| D. | sodium chloride |
| Answer» C. hydrogen sulphate | |
| 8. |
Corrosion can be prevented by |
| A. | Alloying |
| B. | Tinning |
| C. | Galvanizing |
| D. | all of above |
| Answer» E. | |
| 9. |
On an industrial scale, sodium metal is prepared by electrolysis of fused |
| A. | NaOH |
| B. | NaCl |
| C. | NaO |
| D. | NH3 |
| Answer» C. NaO | |
| 10. |
The process in which substance gains electrons is called |
| A. | oxidation |
| B. | hydrogenation |
| C. | sublimation |
| D. | reduction |
| Answer» E. | |
| 11. |
The natural force that holds together elements together is called |
| A. | chemical bond |
| B. | force of attraction |
| C. | gravitational force |
| D. | physical bond |
| Answer» B. force of attraction | |
| 12. |
Hair contains keratin proteins which are also present in nails and wool is an example of |
| A. | Biochemistry |
| B. | Inorganic chemistry |
| C. | Physical chemistry |
| D. | organic chemistry |
| Answer» B. Inorganic chemistry | |
| 13. |
The empirical formula for water is |
| A. | CO2 |
| B. | HO |
| C. | H2 |
| D. | H2O |
| Answer» E. | |
| 14. |
Free radicals are electrically |
| A. | positively charged |
| B. | negatively charged |
| C. | neutral |
| D. | all of above |
| Answer» D. all of above | |
| 15. |
A mixture that consists of different components is called |
| A. | homogeneous mixture |
| B. | heterogeneous mixture |
| C. | mixture |
| D. | dilute solution |
| Answer» C. mixture | |
| 16. |
On basis of electronic configuration the group and period of 95B is |
| A. | 2 and IIIA |
| B. | 3 and IIA |
| C. | 4 and VIA |
| D. | 5 and VIIA |
| Answer» B. 3 and IIA | |
| 17. |
The first three periods are |
| A. | long periods |
| B. | short periods |
| C. | moderate periods |
| D. | all of above |
| Answer» C. moderate periods | |
| 18. |
Across the period the atomic size decreases due to |
| A. | shielding effect |
| B. | photoelectric effect |
| C. | increase in nuclear force of attraction |
| D. | decrease in nuclear force of attraction |
| Answer» D. decrease in nuclear force of attraction | |
| 19. |
In the periodic table, helium is placed at |
| A. | top left corner |
| B. | bottom right corner |
| C. | bottom left corner |
| D. | top right corner |
| Answer» E. | |
| 20. |
Both elements of 1st period contain valence electrons in |
| A. | M shell |
| B. | N shell |
| C. | K shell |
| D. | S shell |
| Answer» D. S shell | |
| 21. |
The average kinetic energy of gas molecules is directly proportional to |
| A. | T2 |
| B. | √T |
| C. | T |
| D. | 2T |
| Answer» D. 2T | |
| 22. |
At constant pressure the average kinetic energy of gas molecules increases 2 times if |
| A. | temperature is increased by 2 times |
| B. | temperature is halved |
| C. | no change in temperature |
| D. | temperature remains constant |
| Answer» B. temperature is halved | |
| 23. |
The temperature at which the solid starts melting is called |
| A. | boiling point |
| B. | freezing point |
| C. | melting point |
| D. | sublimating point |
| Answer» D. sublimating point | |
| 24. |
Conversion of a liquid to a gas at all temperatures is called |
| A. | sublimation |
| B. | evaporation |
| C. | condensation |
| D. | boiling |
| Answer» C. condensation | |
| 25. |
The process in which the solid changes directly into vapors without changing in the liquid state is called |
| A. | condensation |
| B. | evaporation |
| C. | boiling |
| D. | sublimation |
| Answer» E. | |
| 26. |
The number of moles of solute dissolved per dm3 of the solution is |
| A. | molality |
| B. | percentage |
| C. | concentration |
| D. | molarity |
| Answer» E. | |
| 27. |
The solution of copper and zinc forms |
| A. | sodium |
| B. | mercury |
| C. | brass |
| D. | silver |
| Answer» D. silver | |
| 28. |
To prepare ammonia gas, the gaseous mixture of |
| A. | hydrogen and chlorine is used |
| B. | hydrogen and nitrogen is used |
| C. | hydrogen and helium is used |
| D. | hydrogen and iodine is used |
| Answer» C. hydrogen and helium is used | |
| 29. |
Fog is a solution to |
| A. | air in water vapors |
| B. | air in air |
| C. | vapors in vapors |
| D. | water vapors in air |
| Answer» E. | |
| 30. |
Bypassing hydrogen gas through vegetable oil, it is converted in to |
| A. | butter |
| B. | milk |
| C. | ghee |
| D. | condensed milk |
| Answer» D. condensed milk | |
| 31. |
The energy of an electron in orbit is proportional to |
| A. | distance between shells |
| B. | distance from nucleus |
| C. | distance between two nuclei |
| D. | positive charge inside nucleus |
| Answer» C. distance between two nuclei | |
| 32. |
In Rutherford's experiment, α particles were deflected because of |
| A. | electrostatic repulsion between α particles and positively charged part of atom |
| B. | electrostatic attraction between α particles and positively charged part of atom |
| C. | electrostatic repulsion between β particles and positively charged part of atom |
| D. | electrostatic attraction between γ particles and positively charged part of atom |
| Answer» B. electrostatic attraction between α particles and positively charged part of atom | |
| 33. |
Electron revolves around the nucleus in orbits which have |
| A. | variable energy |
| B. | fixed energy |
| C. | infinite energy |
| D. | zero energy |
| Answer» C. infinite energy | |
| 34. |
Water that contains H-2 atoms is called |
| A. | heavy water |
| B. | light water |
| C. | pure water |
| D. | chlorinated water |
| Answer» B. light water | |
| 35. |
If n = 3 we are in |
| A. | K shell |
| B. | L shell |
| C. | M shell |
| D. | F shell |
| Answer» D. F shell | |
| 36. |
The number of electrons lost by atoms of group IIIA equals |
| A. | 2 |
| B. | 4 |
| C. | 5 |
| D. | 3 |
| Answer» E. | |
| 37. |
The two F-atoms share one electron in their outermost shell to gain electronic configuration of |
| A. | Xe |
| B. | Ar |
| C. | Kr |
| D. | Ne |
| Answer» E. | |
| 38. |
Non-metals have |
| A. | high ionization energies |
| B. | low ionization energies |
| C. | zero ionization energy |
| D. | infinite ionization energy |
| Answer» B. low ionization energies | |
| 39. |
The interaction between highly electron-deficient hydrogen and highly electronegative atom is called |
| A. | Covalent bond |
| B. | ionic bond |
| C. | dipole-dipole interaction |
| D. | hydrogen bond |
| Answer» E. | |
| 40. |
The atoms of metals form |
| A. | anions |
| B. | molecules |
| C. | cation |
| D. | none of above |
| Answer» D. none of above | |
| 41. |
6.022 * 1023 atoms of Sulphur contains |
| A. | 2 moles |
| B. | 3 moles |
| C. | 4 moles |
| D. | 1 mole |
| Answer» E. | |
| 42. |
The molecular formula gives |
| A. | simplest ratio of atoms |
| B. | actual whole number ratio of atoms |
| C. | whole number ratio of atoms |
| D. | natural number ratio of atoms |
| Answer» C. whole number ratio of atoms | |
| 43. |
Which of the following is present in vinegar? |
| A. | 10% acetic acid |
| B. | 5%acetic acid |
| C. | 7% acetic acid |
| D. | 8% acetic acid |
| Answer» C. 7% acetic acid | |
| 44. |
An oxide ion has -2 charge because |
| A. | oxygen looses two electrons |
| B. | oxygen gains two electrons |
| C. | oxygen becomes neutral |
| D. | oxygen gains 3 electrons |
| Answer» C. oxygen becomes neutral | |
| 45. |
Compounds have atoms of |
| A. | same sizes |
| B. | different sizes |
| C. | same electrons |
| D. | different electrons |
| Answer» C. same electrons | |
| 46. |
Electrochemical cells convert which of these into electrical energy? |
| A. | mechanical energy |
| B. | potential energy |
| C. | kinetic energy |
| D. | chemical energy |
| Answer» E. | |
| 47. |
Conditions for good electroplating are |
| A. | high current density |
| B. | low temperature |
| C. | high concentration of metal in electrolyte |
| D. | all of above |
| Answer» E. | |
| 48. |
Lead and Zinc metals occur naturally as |
| A. | oxides |
| B. | sulphite ores |
| C. | carbon ores |
| D. | chloride ores |
| Answer» C. carbon ores | |
| 49. |
Oxidation-reduction reaction involves |
| A. | transfer of neutrons |
| B. | transfer of protons |
| C. | transfer of electrons |
| D. | all of above |
| Answer» D. all of above | |
| 50. |
As compare to iron, aluminum has |
| A. | higher tendency to oxidize |
| B. | less tendency to oxidize |
| C. | equal tendency to oxidize |
| D. | all of above |
| Answer» B. less tendency to oxidize | |