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.
| 201. |
In the air, the nitrogen gas acts as |
| A. | solute |
| B. | solvent |
| C. | gaseous solute |
| D. | aqueous solute |
| Answer» C. gaseous solute | |
| 202. |
The methanol and water are |
| A. | miscible |
| B. | non miscible |
| C. | forms saturated solution |
| D. | forms supersaturated solution |
| Answer» B. non miscible | |
| 203. |
Mass of solute dissolved in 100g of a solution refers to |
| A. | percentage of solution |
| B. | molarity of solution |
| C. | molality of solution |
| D. | none of above |
| Answer» B. molarity of solution | |
| 204. |
In the presence of crystals of solute, a supersaturated solution is |
| A. | not stable |
| B. | stable |
| C. | cannot be made |
| D. | none of above |
| Answer» B. stable | |
| 205. |
When two identical atoms share electron pairs and exert force on each other then the bond form is |
| A. | non-polar covalent bond |
| B. | polar covalent bond |
| C. | double covalent bond |
| D. | coordinate covalent bond |
| Answer» B. polar covalent bond | |
| 206. |
To form anion, the non-metal atom |
| A. | looses electrons |
| B. | gains electron |
| C. | losses protons |
| D. | gain protons |
| Answer» C. losses protons | |
| 207. |
Bonds which involve 3 shared electron pairs are |
| A. | double covalent bond |
| B. | single covalent bond |
| C. | triple covalent bond |
| D. | coordinate covalent bond |
| Answer» D. coordinate covalent bond | |
| 208. |
Nobel gases are stable because they contain |
| A. | 7 electrons in valence shell |
| B. | 8 electrons in valence shell |
| C. | 5 electrons in valence shell |
| D. | 4 electrons in valence shell |
| Answer» C. 5 electrons in valence shell | |
| 209. |
When one atom forms cation by losing an electron and other forms anion by accepting that electron then bond form between them is |
| A. | Covalent bond |
| B. | Ionic bond |
| C. | coordinate covalent bond |
| D. | single covalent bond |
| Answer» C. coordinate covalent bond | |
| 210. |
The tendency of atoms to acquire eight electrons in their valence shell is |
| A. | octet rule |
| B. | duplet rule |
| C. | triplet rule |
| D. | none of above |
| Answer» B. duplet rule | |
| 211. |
Chemical bonding between atoms is |
| A. | electrical in nature |
| B. | mechanical in nature |
| C. | chemical in nature |
| D. | potential in nature |
| Answer» B. mechanical in nature | |
| 212. |
At room temperature most of the ionic compounds are |
| A. | amorphous solids |
| B. | crystalline solids |
| C. | liquids |
| D. | gases |
| Answer» C. liquids | |
| 213. |
In NaCl crystal each Na+ ion is surrounded by |
| A. | 6 Cl- ions |
| B. | 6 Na+ ions |
| C. | 8 Cl- ions |
| D. | 12 Cl- ions |
| Answer» B. 6 Na+ ions | |
| 214. |
When the partially positive end of one molecule is attracted weakly to partial negative end then force between them is |
| A. | coulomb's force |
| B. | electrostatic force |
| C. | dipole-dipole interaction |
| D. | ionic bond |
| Answer» D. ionic bond | |
| 215. |
The melting point of table salt is |
| A. | 800 °C |
| B. | 801 °C |
| C. | 901 °C |
| D. | 1000 °C |
| Answer» C. 901 °C | |
| 216. |
The covalent compound among the following is |
| A. | NaCl |
| B. | MgO |
| C. | H2O |
| D. | KF |
| Answer» D. KF | |
| 217. |
When atoms lose or gain electrons they acquire configuration of |
| A. | next noble gas |
| B. | halogens |
| C. | alkali metals |
| D. | alkaline metals |
| Answer» B. halogens | |
| 218. |
The bond formed by mutual sharing of the electron is |
| A. | ionic bond |
| B. | coordinate covalent bond |
| C. | covalent bond |
| D. | none of above |
| Answer» D. none of above | |
| 219. |
Helium is chemically |
| A. | active |
| B. | inert |
| C. | unstable |
| D. | none of above |
| Answer» C. unstable | |
| 220. |
Ionic crystals have |
| A. | low melting points |
| B. | moderate melting points |
| C. | high melting points |
| D. | none of above |
| Answer» D. none of above | |
| 221. |
The strength of intermolecular forces from the ionic or covalent bond is |
| A. | weaker |
| B. | stronger |
| C. | equal |
| D. | none of above |
| Answer» B. stronger | |
| 222. |
Electron pairs which are not shared by atoms are called |
| A. | electron pairs |
| B. | lone pairs |
| C. | proton pairs |
| D. | shell pairs |
| Answer» C. proton pairs | |
| 223. |
Oxygen belongs to group VIA so the number of electrons in its valence shell is |
| A. | 6 |
| B. | 7 |
| C. | 8 |
| D. | 4 |
| Answer» B. 7 | |
| 224. |
Synthetic resins are used in places where |
| A. | air resistance is required |
| B. | water resistance is required |
| C. | friction is required |
| D. | adhesion is required |
| Answer» C. friction is required | |
| 225. |
When an electron jumps from lower orbit to higher orbit |
| A. | light is emitted |
| B. | electrons are emitted |
| C. | electrons are absorbed |
| D. | light is absorbed |
| Answer» E. | |
| 226. |
After 3s the sub-shell begin to fill is |
| A. | 3p |
| B. | 3d |
| C. | 3f |
| D. | 4s |
| Answer» B. 3d | |
| 227. |
Electrons revolve only in those orbits with angular momentum as an |
| A. | half integral multiple of 'h' |
| B. | integral multiple of 'h' |
| C. | integral multiple of h ⁄ 2π |
| D. | half integral multiple of 2π |
| Answer» D. half integral multiple of 2π | |
| 228. |
The electronic configuration is the arrangement of electrons in |
| A. | nucleus |
| B. | shells |
| C. | sub-shells |
| D. | all of above |
| Answer» D. all of above | |
| 229. |
According to Rutherford, most of the space occupied by the atom is |
| A. | filled |
| B. | partially filled |
| C. | empty |
| D. | none of above |
| Answer» D. none of above | |