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.
| 151. |
The mass of NaOH present per dm3 of 0.25M NaOH solution is |
| A. | 10 g |
| B. | 8 g |
| C. | 5 g |
| D. | 2 g |
| Answer» B. 8 g | |
| 152. |
Solid solutions of metals are called |
| A. | alloys |
| B. | amalgams |
| C. | saturated solutions |
| D. | supersaturated solution |
| Answer» B. amalgams | |
| 153. |
The oxidation state of any free element is always |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» E. | |
| 154. |
Voltaic cells generate electricity by |
| A. | spontaneous redox reaction |
| B. | non spontaneous redox reaction |
| C. | sublimation reaction |
| D. | thermochemical reaction |
| Answer» B. non spontaneous redox reaction | |
| 155. |
A physical or chemical process that occurs by itself is called |
| A. | non spontaneous |
| B. | self occurring process |
| C. | spontaneous process |
| D. | thermodynamic process |
| Answer» D. thermodynamic process | |
| 156. |
The process used to deposit one metal over another metal is called |
| A. | electrolysis |
| B. | electroplating |
| C. | carbon plating |
| D. | none of above |
| Answer» C. carbon plating | |
| 157. |
The electrolyte among the following is |
| A. | NaOH |
| B. | urea |
| C. | glucose |
| D. | benzene |
| Answer» B. urea | |
| 158. |
Group A elements are called |
| A. | metals |
| B. | alkali metals |
| C. | representative elements |
| D. | transition elements |
| Answer» D. transition elements | |
| 159. |
As we go from top to bottom in a group the shielding effect |
| A. | doesn't change |
| B. | decreases |
| C. | increases |
| D. | remains constant |
| Answer» D. remains constant | |
| 160. |
The energy required to remove an electron from the outermost shell is called |
| A. | potential energy |
| B. | kinetic energy |
| C. | mechanical energy |
| D. | ionization energy |
| Answer» E. | |
| 161. |
Nobel gases are present in |
| A. | VIIA group |
| B. | VIA group |
| C. | VA group |
| D. | VIIIA group |
| Answer» E. | |
| 162. |
Chemical properties depend upon |
| A. | electronic configuration |
| B. | valence shell electronic configuration |
| C. | atomic mass |
| D. | atomic size |
| Answer» C. atomic mass | |
| 163. |
The number of atoms of hydrogen in 2 moles of NH3 |
| A. | 5 * 1023 |
| B. | 3.01 * 1023 |
| C. | 3.61 * 1024 |
| D. | 4 * 1023 |
| Answer» D. 4 * 1023 | |
| 164. |
Negatively charged ions are called |
| A. | cations |
| B. | anions |
| C. | ion |
| D. | none of above |
| Answer» C. ion | |
| 165. |
The molecular mass of glucose is |
| A. | 180.096 amu |
| B. | 190.096 amu |
| C. | 181.096 amu |
| D. | 130.096 amu |
| Answer» B. 190.096 amu | |
| 166. |
A science that examines the material this universe contains and changes in them is called |
| A. | Chemistry |
| B. | Physics |
| C. | Biology |
| D. | Geography |
| Answer» B. Physics | |
| 167. |
If one mole of carbon contains x atoms then the number of atoms in 12g of Mg are |
| A. | x |
| B. | 0.5x |
| C. | 2x |
| D. | 1.5x |
| Answer» C. 2x | |
| 168. |
An unsaturated solution |
| A. | cannot dissolve more solute |
| B. | cannot add more solvent |
| C. | can add more solute |
| D. | none of above |
| Answer» D. none of above | |
| 169. |
The molarity of solution which contains 40 g urea dissolved in 500cm3 is |
| A. | 1.2 M |
| B. | 1.389 M |
| C. | 1.334 M |
| D. | 1.5 M |
| Answer» D. 1.5 M | |
| 170. |
The particle size in suspension is |
| A. | less than 103 nm |
| B. | 102 nm |
| C. | greater than 103 |
| D. | 10 nm |
| Answer» D. 10 nm | |
| 171. |
When the tiny particles of a substance are dispersed through a medium then the mixture is called |
| A. | alloys |
| B. | amalgams |
| C. | suspension |
| D. | colloid |
| Answer» E. | |
| 172. |
The substance present in a lesser amount in solution is |
| A. | solute |
| B. | solvent |
| C. | aqueous solvent |
| D. | none of above |
| Answer» B. solvent | |
| 173. |
An electrochemical cell is also called |
| A. | battery cell |
| B. | galvanic cell |
| C. | cell |
| D. | chargeable cell |
| Answer» C. cell | |
| 174. |
In a dry cell, the anode is made up of |
| A. | zinc |
| B. | calcium |
| C. | sodium |
| D. | graphite |
| Answer» E. | |
| 175. |
The oxidation state of group IIIA metals is |
| A. | -3 |
| B. | 3 |
| C. | 0 |
| D. | 1 |
| Answer» C. 0 | |
| 176. |
The elements whose oxidation number is increased are |
| A. | reduced |
| B. | hydrogenated |
| C. | oxidized |
| D. | oxygenated |
| Answer» D. oxygenated | |
| 177. |
Loss of hydrogen atoms by an element is called |
| A. | hydrogenation |
| B. | oxidation |
| C. | reduction |
| D. | sublimation |
| Answer» C. reduction | |
| 178. |
The element reduced in following reaction 2Ca + O2 2CaO is |
| A. | Ca |
| B. | O2 |
| C. | CaO |
| D. | none of above |
| Answer» C. CaO | |
| 179. |
Rusting of iron occurs due to |
| A. | reduction |
| B. | hydrogenation |
| C. | oxidation |
| D. | sublimation |
| Answer» D. sublimation | |
| 180. |
At constant temperature, when pressure is decreased the average kinetic energy of gas molecules |
| A. | decreases |
| B. | remains unchanged |
| C. | decreases |
| D. | becomes two fold |
| Answer» C. decreases | |
| 181. |
Force exerted by a gas on unit area of the container is called |
| A. | effusion |
| B. | diffusion |
| C. | mobility |
| D. | pressure |
| Answer» E. | |
| 182. |
The escape of gas molecules from a small hole one after the other is called |
| A. | diffusion |
| B. | effusion |
| C. | concentration |
| D. | mobility |
| Answer» C. concentration | |
| 183. |
An ordered, repeating three-dimensional arrangement of particles makes up a |
| A. | crystalline solid |
| B. | amorphous solid |
| C. | non crystalline solid |
| D. | none of above |
| Answer» B. amorphous solid | |
| 184. |
If the temperature of any gas is increased its volume |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of above |
| Answer» B. decreases | |
| 185. |
When halogens are exposed to sunlight, they split up in to |
| A. | atoms |
| B. | ions |
| C. | radicals |
| D. | molecules |
| Answer» D. molecules | |
| 186. |
A free radical has |
| A. | odd number of electrons |
| B. | even number of electrons |
| C. | no electrons |
| D. | none of above |
| Answer» B. even number of electrons | |
| 187. |
Cookies and bread rise due to |
| A. | conversion of washing soda into CO2 |
| B. | conversion of H2O in to CO2 |
| C. | conversion of baking soda into O2 |
| D. | conversion of baking soda in to CO2 |
| Answer» E. | |
| 188. |
The substance which has a formula mass of 133.5 amu is |
| A. | MgCl2 |
| B. | S2Cl2 |
| C. | BCl3 |
| D. | AlCl3 |
| Answer» E. | |
| 189. |
The mass of carbon present in 44g of carbon dioxide is |
| A. | 12g |
| B. | 6g |
| C. | 24g |
| D. | 44g |
| Answer» B. 6g | |
| 190. |
The shielding effect across the period |
| A. | increases |
| B. | decreases |
| C. | becomes equal to above periods |
| D. | remains same |
| Answer» E. | |
| 191. |
The horizontal rows of the periodic table are called |
| A. | rows |
| B. | periods |
| C. | columns |
| D. | groups |
| Answer» C. columns | |
| 192. |
The average distance between the nucleus and outer shell is called |
| A. | atomic size |
| B. | nuclear size |
| C. | shielding effect |
| D. | atomic number |
| Answer» B. nuclear size | |
| 193. |
The ability of an atom to attract electrons towards itself is called |
| A. | electron affinity |
| B. | electronegativity |
| C. | ionization energy |
| D. | shielding effect |
| Answer» C. ionization energy | |
| 194. |
Period number of the element indicates the value of |
| A. | all shells |
| B. | valence shell |
| C. | 1st shell |
| D. | 2nd shell |
| Answer» C. 1st shell | |
| 195. |
A concentrated aqueous solution of sodium chloride is called |
| A. | aqueous solution |
| B. | salt solution |
| C. | brine |
| D. | lemonade |
| Answer» D. lemonade | |
| 196. |
Electrolytes convert electricity in |
| A. | solid state |
| B. | liquid state |
| C. | gaseous state |
| D. | plasma state |
| Answer» C. gaseous state | |
| 197. |
In thermal power stations, carbon atoms undergo oxidation to form |
| A. | CO2 |
| B. | CO |
| C. | H2O |
| D. | O2 |
| Answer» B. CO | |
| 198. |
The electrodes used in the production of sodium metal are |
| A. | iron cathode and graphite anode |
| B. | sodium cathode and carbon anode |
| C. | aluminum cathode and fluoride anode |
| D. | aluminum cathode and sodium anode |
| Answer» B. sodium cathode and carbon anode | |
| 199. |
In chromium plating, few drops of Sulphuric acid are added to the electrolyte to prevent |
| A. | oxidation |
| B. | reduction |
| C. | hydrolysis |
| D. | sublimation |
| Answer» D. sublimation | |
| 200. |
The only liquid metal at room temperature is |
| A. | sodium |
| B. | iron |
| C. | mercury |
| D. | aluminum |
| Answer» D. aluminum | |