MCQOPTIONS
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MCQOPTIONS
This section includes 279 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
During the process of electrolytic refining of copper some metal present as impurity settle as anode mud. These are |
| A. | Ag and Au |
| B. | Pb and Zn |
| C. | Fe and Ni |
| D. | Sn and Ag |
| Answer» B. Pb and Zn | |
| 152. |
The main element of pitch blende ore is |
| A. | U |
| B. | Ce |
| C. | Th |
| D. | Mg |
| Answer» B. Ce | |
| 153. |
The most malleable of all metals is |
| A. | Ag |
| B. | Au |
| C. | Na |
| D. | Pt |
| Answer» C. Na | |
| 154. |
The metal always found in free state is |
| A. | Gold |
| B. | Sodium |
| C. | Silver |
| D. | Copper |
| Answer» B. Sodium | |
| 155. |
Wolframite ore is separated from tinstone ore by the process of |
| A. | smelting |
| B. | calcination |
| C. | roasting |
| D. | electromagnetic |
| Answer» E. | |
| 156. |
Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers etc. ? |
| A. | Nickel and cadmium |
| B. | Zinc and corbon |
| C. | Lead peroxide and lead |
| D. | Iron and cadmium |
| Answer» B. Zinc and corbon | |
| 157. |
If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called |
| A. | hardening |
| B. | tempering |
| C. | annealing |
| D. | softening |
| Answer» D. softening | |
| 158. |
Which of the following metal has the lowest value of ionisation energy |
| A. | Mg |
| B. | Ba |
| C. | Sr |
| D. | None of these |
| Answer» D. None of these | |
| 159. |
In the extraction of zinc the formation of blue flame is due to the burning of |
| A. | C |
| B. | CO |
| C. | Zn |
| D. | ZnO |
| Answer» C. Zn | |
| 160. |
Gyanide process is used for extraction of |
| A. | Ag |
| B. | Au |
| C. | Cu |
| D. | Zn |
| Answer» C. Cu | |
| 161. |
Iron ore is concentrated by |
| A. | froth floation |
| B. | electrolysis |
| C. | roasting |
| D. | magnetic treatment |
| Answer» E. | |
| 162. |
If a not-metal is added to the interstitial sites of a metal, then the metal becomes |
| A. | less tensile |
| B. | less malleable |
| C. | softer |
| D. | none of these |
| Answer» C. softer | |
| 163. |
Which of the following elements does not show variable oxidation states ? |
| A. | iron |
| B. | titanium |
| C. | copper |
| D. | zinc |
| Answer» E. | |
| 164. |
Important ore of Mg is |
| A. | Magnatide |
| B. | Carnotite |
| C. | Gypsum |
| D. | Carnallite |
| Answer» E. | |
| 165. |
Aluminium surface are often 'anodized'. This means deposition of a layer of |
| A. | chromium oxide |
| B. | aluminium oxide |
| C. | nickel oxide |
| D. | zine oxide |
| Answer» E. | |
| 166. |
Variable valency is shown by |
| A. | typical elements |
| B. | normal elements |
| C. | transition elements |
| D. | none of these |
| Answer» D. none of these | |
| 167. |
The element with electronic configuration 3a |
| A. | Metalloid |
| B. | Non-metal |
| C. | Tansition metal |
| D. | Noble gas |
| Answer» D. Noble gas | |
| 168. |
Misch metal is |
| A. | an alloy of copper |
| B. | an alloy of lanthanoid metal |
| C. | an alloy of aluminium |
| D. | a mixture of chromium and lead chromate |
| Answer» C. an alloy of aluminium | |
| 169. |
Which of one of the following metals is extracted by thermal reduction process ? |
| A. | Copper |
| B. | Iron |
| C. | Aluminium |
| D. | Magnesium |
| Answer» B. Iron | |
| 170. |
Electrometallurgy is employed for the reduction of |
| A. | Cu |
| B. | Fe |
| C. | Na |
| D. | Ag |
| Answer» B. Fe | |
| 171. |
In roasting the ores are generally converted into |
| A. | Metal oxides |
| B. | Metals |
| C. | Hydrated metal oxides |
| D. | None of these |
| Answer» B. Metals | |
| 172. |
Heating pyrites in air to remove sulphur is known as |
| A. | Bessemerisation |
| B. | Roasting |
| C. | Calcination |
| D. | Smelting |
| Answer» C. Calcination | |
| 173. |
Alloy is an example of |
| A. | Gel |
| B. | Aerosol |
| C. | Solid sol |
| D. | Emulsion |
| Answer» D. Emulsion | |
| 174. |
Bauxite is concentrated by |
| A. | chemical method |
| B. | roasting |
| C. | froth floatation process |
| D. | magnetic separation |
| Answer» B. roasting | |
| 175. |
Galena ore is concentrated by |
| A. | gravity separation |
| B. | froth floatation process |
| C. | magnetic separation |
| D. | roasting |
| Answer» B. froth floatation process | |
| 176. |
A certain metal M is used to prepare an antacid, which is used as a medicine for acidity. This metal accidently catches fire, which can not be extinguished by using CO |
| A. | Mg |
| B. | Ba |
| C. | Be |
| D. | Ca |
| Answer» B. Ba | |
| 177. |
Best quality steel is manufactured by using |
| A. | Crucible process |
| B. | Electrical process |
| C. | Bassemer's process |
| D. | Simenes Martin's method |
| Answer» C. Bassemer's process | |
| 178. |
Tempered steel is |
| A. | Hard and brittle |
| B. | Soft and malleable |
| C. | very soft |
| D. | Neither so hard nor so brittle |
| Answer» E. | |
| 179. |
The element present in heamoglobin of blood is |
| A. | Fe |
| B. | Cu |
| C. | Na |
| D. | Al |
| Answer» B. Cu | |
| 180. |
An alloy of.......is used in fountain pen nib tips |
| A. | Pt-Ag |
| B. | Pt-Au |
| C. | Pt-Ir |
| D. | Pt-Cu |
| Answer» D. Pt-Cu | |
| 181. |
In roasting |
| A. | no metal impurities are removed |
| B. | ore becomes porous |
| C. | moisture is removed |
| D. | all the above |
| Answer» E. | |
| 182. |
Which metal has the lowest melting point ? |
| A. | Hg |
| B. | Sn |
| C. | Cs |
| D. | Na |
| Answer» B. Sn | |
| 183. |
The tendancy of the transition elements to form coloured compounds is due to |
| A. | transition of electrons from s-orbitals of the outer shells to p-orbitals |
| B. | d-d transition in last but one orbit |
| C. | transition of electrons from one atom to the other |
| D. | none of the above |
| Answer» C. transition of electrons from one atom to the other | |
| 184. |
When ore is heated generally in absence of air then process is called |
| A. | calcination |
| B. | roasting |
| C. | smelting |
| D. | none |
| Answer» B. roasting | |
| 185. |
In blast furnance, iron oxide is reduced by |
| A. | silica |
| B. | CO |
| C. | C |
| D. | lime stone |
| Answer» C. C | |
| 186. |
The highest temperature is achieved in which type furnance ? |
| A. | Blast |
| B. | Reverberatory |
| C. | Electric |
| D. | Muffle |
| Answer» D. Muffle | |
| 187. |
Most abundant element on the earth's crust by weight is |
| A. | Oxygen |
| B. | Iron |
| C. | Silicon |
| D. | Aluminium |
| Answer» B. Iron | |
| 188. |
Cyanide process is used in the extraction of |
| A. | Cu |
| B. | Al |
| C. | Zn |
| D. | Ag |
| Answer» E. | |
| 189. |
An important constituent of amalgam is |
| A. | Al |
| B. | Ag |
| C. | Hg |
| D. | Mg |
| Answer» D. Mg | |
| 190. |
The ore present in India in abundance is |
| A. | Monazite |
| B. | Magnetite |
| C. | Bauxite |
| D. | Fluorspar |
| Answer» C. Bauxite | |
| 191. |
Slag is a product of |
| A. | Coke and metal oxide |
| B. | Metal and flux |
| C. | Flux and impurities |
| D. | Flux and coke |
| Answer» D. Flux and coke | |
| 192. |
The purification of alumina is done by |
| A. | Baeyer's process |
| B. | Hoop's process |
| C. | Bosch process |
| D. | Castner process |
| Answer» B. Hoop's process | |
| 193. |
Gold and silver are extracted from their respective ores by |
| A. | Smelting |
| B. | Roasting |
| C. | Leaching |
| D. | Hydro metallurgy |
| Answer» E. | |
| 194. |
The metal which is generally used for the filaments of electric bulb is |
| A. | Pt |
| B. | Fe |
| C. | W |
| D. | Cu |
| Answer» D. Cu | |
| 195. |
In the reverberatory furnace |
| A. | The flames do not come in contact with the charge |
| B. | The flames come in contact with the charge |
| C. | Only hog gases come in contact with the charge |
| D. | None of the above |
| Answer» D. None of the above | |
| 196. |
Which one of the following is found in only body |
| A. | Pb |
| B. | Fe |
| C. | Cd |
| D. | Al |
| Answer» C. Cd | |
| 197. |
MgCI |
| A. | magnesium hydride |
| B. | magnesium chloride |
| C. | magnesium oxide |
| D. | magnesium oxchloride |
| Answer» C. magnesium oxide | |
| 198. |
Highly pure dilute solution of sodium in liquid ammonia |
| A. | exhibits electrical neutrality |
| B. | produces sodium amide |
| C. | produces hydrogen gas |
| D. | shows blue colour |
| Answer» E. | |
| 199. |
When ore is heated generally in presence of air, then process is called |
| A. | smelting |
| B. | roasting |
| C. | calcination |
| D. | none |
| Answer» C. calcination | |
| 200. |
The salt which is least likely to be found in minerals is |
| A. | chloride |
| B. | sulphide |
| C. | nitrate |
| D. | sulphate |
| Answer» D. sulphate | |