MCQOPTIONS
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MCQOPTIONS
This section includes 255 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Mass of an element in a compound can be calculated through |
| A. | Ar of the atoms/Mr of the compound |
| B. | Mr of the atoms/Ar of the compound |
| C. | (Ar of the atoms/Mr of the compound) × mass of sample |
| D. | (Mr of the compound/Ar of the atoms) × mass of sample |
| Answer» D. (Mr of the compound/Ar of the atoms) × mass of sample | |
| 152. |
Combining Copper(II) (Cu+2) with Oxygen (O₂) results in |
| A. | CuO |
| B. | Cu₂O |
| C. | CuO₂ |
| D. | Cu(OH)₂ |
| Answer» B. Cu₂O | |
| 153. |
Valency of all these ions is negative 1, except |
| A. | OH |
| B. | PO₄ |
| C. | NO₃ |
| D. | Br |
| Answer» C. NO₃ | |
| 154. |
In H₂SO₄, chemical composition of oxygen is |
| A. | 0.1111 |
| B. | 0.5032 |
| C. | 0.6531 |
| D. | 0.3265 |
| Answer» D. 0.3265 | |
| 155. |
In Calcium Hydroxide (Ca(OH)₂), valency of Ca is |
| A. | −1 |
| B. | −2 |
| C. | +1 |
| D. | +2 |
| Answer» E. | |
| 156. |
Metal that burns even more brightly than Magnesium (Mg) is |
| A. | zinc |
| B. | mercury |
| C. | zirconium |
| D. | diamond |
| Answer» D. diamond | |
| 157. |
In writing chemical equations, inclusion of state symbols shall be done while |
| A. | correct chemical formulae of reactants and products are written |
| B. | the equation is being balanced to fulfill the law of conservation of mass |
| C. | the equation has been balanced |
| D. | the chemical formulae of products and reactants have been changed to bring about quick balancing |
| Answer» D. the chemical formulae of products and reactants have been changed to bring about quick balancing | |
| 158. |
Sulfite ion can be written symbolically as |
| A. | SO₄−2 |
| B. | SO₃−2 |
| C. | SO₄−3 |
| D. | S−2 |
| Answer» C. SO₄−3 | |
| 159. |
Natural gas consists of |
| A. | methane |
| B. | ethane |
| C. | propane |
| D. | butane |
| Answer» B. ethane | |
| 160. |
Hydrogen Sulfate (H₂SO₄) has |
| A. | positive charge |
| B. | negative charge |
| C. | double negative charge |
| D. | double positive charge |
| Answer» C. double negative charge | |
| 161. |
If an acid reacts with an oxide, product will include H₂O and |
| A. | a salt(s) |
| B. | an acid (l) |
| C. | a base |
| D. | a gas |
| Answer» B. an acid (l) | |
| 162. |
The ratio of hydrogen to oxygen in a water molecule is equal to |
| A. | 1:2 ratio |
| B. | 2:1 ratio |
| C. | 4:3 ratio |
| D. | 1:4 ratio |
| Answer» C. 4:3 ratio | |
| 163. |
The simple molecular structure is of |
| A. | Na₂O |
| B. | MgO |
| C. | SiO₂ |
| D. | P₄O₁₀ |
| Answer» E. | |
| 164. |
The compounds which are made up of benzene are known as |
| A. | aryl compounds only |
| B. | aromatic compounds only |
| C. | benzyl compounds |
| D. | aryl and aromatic compounds |
| Answer» E. | |
| 165. |
Formula K₂SO₄ indicates that |
| A. | 2 ions of Kalium are combined with 4 molecules of oxygen |
| B. | 2 ions of Kalium are combined with 1 sulfate ion |
| C. | 2 ions of potassium are combined with one sulfur and 4 oxygen molecules |
| D. | 1 ion of potassium is combined with 1 sulfate ion |
| Answer» C. 2 ions of potassium are combined with one sulfur and 4 oxygen molecules | |
| 166. |
In Na₂CO₃.10H₂O, highest percentage composition is of |
| A. | sodium |
| B. | oxygen |
| C. | water |
| D. | carbon |
| Answer» D. carbon | |
| 167. |
In acid and base reaction, product includes |
| A. | a salt(s) |
| B. | water |
| C. | acids |
| D. | both a and b |
| Answer» D. both a and b | |
| 168. |
Chemical formula of Copper(I) Oxide |
| A. | Cu₂O |
| B. | CuO₃ |
| C. | Cu(OH)₂ |
| D. | CuO |
| Answer» B. CuO₃ | |
| 169. |
The purification of compounds is usually done by chemists for formula analysis by the process of |
| A. | gas chromatography |
| B. | spectrometry |
| C. | liquid chromatography |
| D. | manometer |
| Answer» B. spectrometry | |
| 170. |
Molar mass of calcium chloride is |
| A. | 100.01gmol-1 |
| B. | 99.98gmol-1 |
| C. | 110.98gmol-1 |
| D. | 88.2gmol-1 |
| Answer» D. 88.2gmol-1 | |
| 171. |
Sulfuric acid is synthesized by the process of |
| A. | Haber |
| B. | contact |
| C. | electrolysis |
| D. | hydrolysis |
| Answer» C. electrolysis | |
| 172. |
Formula of Calcium Hydrogen Carbonate indicates |
| A. | that the charge on Ca is +2 |
| B. | the charge on HCO₃ is −1 |
| C. | that for each molecule of calcium hydrogen carbonate, one ion of Ca and two ions of hydrogen carbona |
| D. | all of these |
| Answer» E. | |
| 173. |
In Na₂CO₃.10H₂O, percentage of Carbon is |
| A. | 0.4201 |
| B. | 0.0422 |
| C. | 0.042 |
| D. | 0.46 |
| Answer» D. 0.46 | |
| 174. |
In KHCO₃, highest percentage composition is of |
| A. | Oxygen |
| B. | Potassium |
| C. | Carbon |
| D. | Hydrogen |
| Answer» B. Potassium | |
| 175. |
Ca(OH)₂ indicates that molecule is formed through |
| A. | two Ca ions and one OH ion |
| B. | One Ca ion and two OH ions |
| C. | the charge on OH ion is -2 |
| D. | the charge on OH ion is +2 |
| Answer» C. the charge on OH ion is -2 | |
| 176. |
Empirical formula can be obtained if following is known: |
| A. | %age or mass of each element |
| B. | relative atomic mass Ar |
| C. | structural formula |
| D. | both a and b |
| Answer» E. | |
| 177. |
Covalent compounds |
| A. | are not made of ions |
| B. | are not formed through exchange of electrons |
| C. | formulae cannot be worked out |
| D. | all of these |
| Answer» E. | |
| 178. |
Magnesium (Mg) burns in oxygen (O₂) to form |
| A. | magnesium peroxide (Mg₂O₂) |
| B. | magnesium hydroxide (Mg(OH)₂) |
| C. | magnesium oxide (MgO) |
| D. | magnesium dioxide (MgO₂) |
| Answer» D. magnesium dioxide (MgO₂) | |
| 179. |
In a benzene molecule, each carbon atom shares one pair of electrons to |
| A. | neighboring atom on one side |
| B. | neighboring atom on other side |
| C. | hydrogen atom |
| D. | all of above |
| Answer» E. | |
| 180. |
In Sulfuric Acid (H₂SO₄), chemical composition of sulfur is |
| A. | 0.0204 |
| B. | 0.3265 |
| C. | 0.6531 |
| D. | 0.9821 |
| Answer» C. 0.6531 | |
| 181. |
Organic molecules with similar relative molecular mass have alcohols (CₙH₂ₙ₊₁OH) bearing high |
| A. | boiling point |
| B. | polarity |
| C. | volatility |
| D. | Sublimation point |
| Answer» B. polarity | |
| 182. |
When Carbon ions (C±4) react with Carbon Dioxide gas (CO₂), product will be |
| A. | methane |
| B. | ethane |
| C. | propane |
| D. | carbon monoxide |
| Answer» E. | |
| 183. |
Consider CaCO₃ and HCl as reactants, how many molecules of CaCl₂ will be formed in products |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 184. |
Valency of nitrogen can be |
| A. | 2 or 4 |
| B. | 4 or 6 |
| C. | 3 or 5 |
| D. | 2 or 3 |
| Answer» D. 2 or 3 | |
| 185. |
Calcium carbonate CaCO₃ is a |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | aqueous |
| Answer» B. liquid | |
| 186. |
π-bonds in benzene spread over all six carbons, hence they are called |
| A. | delocalized |
| B. | spectators |
| C. | inhibitors |
| D. | invaders |
| Answer» B. spectators | |
| 187. |
Molar mass of potassium hydrogen carbonate KHCO₃ is |
| A. | 90.15g/mol |
| B. | 100.115g/mol |
| C. | 111.127g/mol |
| D. | 119.21g/mol |
| Answer» C. 111.127g/mol | |
| 188. |
In Na₂CO₃, relative atomic mass of Carbon is |
| A. | 12 |
| B. | 24 |
| C. | 36 |
| D. | 48 |
| Answer» B. 24 | |
| 189. |
Greatest proportion by mass of nitrogen is in |
| A. | Hydrazine (N₂H₄), |
| B. | ammonium nitrate (NH₄NO₃) |
| C. | ammonium sulphate (NH₄)₂SO₄ |
| D. | urea (NH₂CONH₂) |
| Answer» B. ammonium nitrate (NH₄NO₃) | |
| 190. |
Chemical formula of monohydrate monosodium phosphate is |
| A. | H₂ONaPO₂ |
| B. | PO₂NaH₂O |
| C. | NaH₂PO₄.H₂O |
| D. | NaH₃PO₂.H₂O |
| Answer» D. NaH₃PO₂.H₂O | |
| 191. |
Chemical formula of aluminum oxide is |
| A. | Al₂O₃ |
| B. | AlO₄ |
| C. | Al₂O₅.H₂O |
| D. | Al₂O₅ |
| Answer» B. AlO₄ | |
| 192. |
Symbol of Gold has been derived from its Latin name |
| A. | Argentum |
| B. | Argon |
| C. | Aurum |
| D. | Augmenten |
| Answer» D. Augmenten | |
| 193. |
Valency is numerically equal to |
| A. | the charge of an ion |
| B. | the combining power of an atom |
| C. | the combining power of a radical |
| D. | all of these |
| Answer» E. | |
| 194. |
Chemical formula of calcium nitrate is |
| A. | CNOH |
| B. | Ca(NO₃)₂ |
| C. | CaNO₃ |
| D. | CaNO₃ |
| Answer» C. CaNO₃ | |
| 195. |
In Na₂CO₃, relative atomic mass of Oxygen is |
| A. | 12 |
| B. | 24 |
| C. | 36 |
| D. | 48 |
| Answer» E. | |
| 196. |
If atomic mass of copper is 63.546, mass percent of copper in Cu₂O will be |
| A. | 0.7898 |
| B. | 0.8098 |
| C. | 0.8882 |
| D. | 0.8678 |
| Answer» D. 0.8678 | |
| 197. |
In Na₂CO₃.10H₂O, percentage of water is |
| A. | 0.5009 |
| B. | 0.1699 |
| C. | 0.6507 |
| D. | 0.6294 |
| Answer» E. | |
| 198. |
A white smoke consisting of fine white solid particles is formed by |
| A. | propane |
| B. | butane |
| C. | magnesium oxide |
| D. | tin oxide |
| Answer» D. tin oxide | |
| 199. |
All of these radicals have a valency of 1, except |
| A. | OH |
| B. | CO₃ |
| C. | NO₃ |
| D. | HCO₃ |
| Answer» C. NO₃ | |
| 200. |
Formula of carbonic acid is |
| A. | HCO₂ |
| B. | HCHO₃ |
| C. | H₂CO₂ |
| D. | H₂CO₃ |
| Answer» E. | |