MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 376 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
S is symbol of |
| A. | silver |
| B. | sodium |
| C. | Sulphur |
| D. | Selenium |
| Answer» D. Selenium | |
| 252. |
A mixture |
| A. | is not a pure substance |
| B. | is not formed through chemical reaction |
| C. | is a pure substance |
| D. | both a and b |
| Answer» E. | |
| 253. |
The lowest density of metals provided is of |
| A. | Be |
| B. | Ca |
| C. | Sr |
| D. | Mg |
| Answer» C. Sr | |
| 254. |
Main elements of living things do not include |
| A. | nitrogen |
| B. | Phosphorus |
| C. | Sodium |
| D. | Calcium |
| Answer» D. Calcium | |
| 255. |
Elements un-common to both living things and non-living things include |
| A. | Oxygen |
| B. | Carbon |
| C. | Silicon |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
| 256. |
Praseodymium is the |
| A. | longest name in the period table |
| B. | most volatile metal |
| C. | a recently discovered noble gas |
| D. | an excellent conductor of electricity |
| Answer» B. most volatile metal | |
| 257. |
Symbol of gold is |
| A. | Go |
| B. | Gu |
| C. | Au |
| D. | Ag |
| Answer» D. Ag | |
| 258. |
The remaining amount of copper ores on earth is less than |
| A. | 0.12 |
| B. | 0.13 |
| C. | 0.02 |
| D. | 0.01 |
| Answer» E. | |
| 259. |
Element of Group-IV that is a non-metals is |
| A. | Carbon (C ) |
| B. | Germanium (Ge) |
| C. | Lead (Pb) |
| D. | Silicon (Si) |
| Answer» B. Germanium (Ge) | |
| 260. |
Growth of bacteria and fungi is sometimes inhibited by |
| A. | sulfur dioxide |
| B. | ammonium nitrate |
| C. | sulfur trioxide |
| D. | sulfur tetraoxide |
| Answer» B. ammonium nitrate | |
| 261. |
The electronic configuration of Group-II elements is the presence of 2 electrons in |
| A. | outermost quantum shell |
| B. | innermost quantum shell |
| C. | nucleus |
| D. | nuclear envelope |
| Answer» B. innermost quantum shell | |
| 262. |
The basis for naming system is given by class of hydrocarbons |
| A. | Alkanes |
| B. | alkenes |
| C. | alcohols |
| D. | aldehydes |
| Answer» B. alkenes | |
| 263. |
The metallic bonding in aluminum is stronger because of the large number of |
| A. | delocalized electrons |
| B. | spectator electrons |
| C. | mobile electrons |
| D. | lone electrons |
| Answer» B. spectator electrons | |
| 264. |
The greater attractive force due to increasing positive nuclear charge pulls valence shell electrons closer to |
| A. | nucleus |
| B. | protons |
| C. | neutrons |
| D. | nucleons |
| Answer» B. protons | |
| 265. |
The color of Chlorine (Cl₂) is |
| A. | green only |
| B. | yellow only |
| C. | white |
| D. | green and yellow |
| Answer» E. | |
| 266. |
Process of forcing out nylon from nozzles in to long fibers is called |
| A. | addition polymerization |
| B. | substitution polymerization |
| C. | condensation polymerization |
| D. | cold drawing |
| Answer» E. | |
| 267. |
Non-stick lining of a sauce pan is due to halogen-polymer named as |
| A. | poly(ethene) |
| B. | poly(tetrafluroethene) |
| C. | Fluoro ethene |
| D. | poly vinyl chloride |
| Answer» C. Fluoro ethene | |
| 268. |
Haloalkanes react with water in silver nitrate solution to give off |
| A. | alcohol |
| B. | yeast |
| C. | ester |
| D. | ketone |
| Answer» B. yeast | |
| 269. |
Lime used by farmers to raise the pH of the soil is |
| A. | Limestone |
| B. | Fresh lime |
| C. | Lime |
| D. | Slaked Lime |
| Answer» E. | |
| 270. |
The oxidation number of PCl₃ is |
| A. | 3 |
| B. | 4 |
| C. | 2 |
| D. | 1 |
| Answer» B. 4 | |
| 271. |
Going down the group the Group-II elements are more |
| A. | reactive |
| B. | non-reactive |
| C. | volatile |
| D. | non-volatile |
| Answer» B. non-reactive | |
| 272. |
NO₂ toxic fumes are produced as a result of thermal decomposition of nitrates. This NO₂ is |
| A. | Nitrogen (III) oxide |
| B. | Nitrogen(II) oxide |
| C. | Nitrogen (IV) oxide |
| D. | Nitrogen oxide |
| Answer» D. Nitrogen oxide | |
| 273. |
1683 °C is the melting point of |
| A. | sodium |
| B. | aluminum |
| C. | silicon |
| D. | phosphorus |
| Answer» D. phosphorus | |
| 274. |
Polymers whose monomers are bonded to each other via amide link are called |
| A. | amides |
| B. | peptides |
| C. | polyamides |
| D. | polyesters |
| Answer» D. polyesters | |
| 275. |
What is true about Nylon? |
| A. | it is an amide |
| B. | it is a peptide |
| C. | it is a polyamide |
| D. | it is a polyester |
| Answer» D. it is a polyester | |
| 276. |
The highest melting point among these four elements is of |
| A. | Be |
| B. | Ca |
| C. | Sr |
| D. | Mg |
| Answer» B. Ca | |
| 277. |
The compounds formed by group IV elements and chlorine are called |
| A. | fluorides |
| B. | chloride |
| C. | tetra chlorides |
| D. | tetra fluorides |
| Answer» D. tetra fluorides | |
| 278. |
Phenol (C₆H₆O) disrupts hydrogen bonding with water (H₂O), hence, it is |
| A. | partially soluble |
| B. | sparingly soluble |
| C. | insoluble |
| D. | soluble |
| Answer» C. insoluble | |
| 279. |
Poisonous gases are formed with reactions of halogens and sulfuric acid that's why it should be handled |
| A. | with care |
| B. | with adult supervision |
| C. | with ventilated laboratory |
| D. | all of above |
| Answer» E. | |
| 280. |
The other measures of atomic radii are |
| A. | metallic radii only |
| B. | Van der Waal's radii only |
| C. | molecular mass |
| D. | metallic radii and Van der Waal's radii |
| Answer» E. | |
| 281. |
Ring-opening polymerization produces |
| A. | nylon 6 |
| B. | polyesters |
| C. | polypeptide |
| D. | none of above |
| Answer» B. polyesters | |
| 282. |
In a giant metallic lattice, half the distance between nuclei is known as |
| A. | atomic radius |
| B. | metallic radius |
| C. | covalent radius |
| D. | Van der Waals's radius |
| Answer» C. covalent radius | |
| 283. |
Group 0 doesn't have a covalent radius as they do not form bonds with each other are the atoms of |
| A. | noble gases |
| B. | metals |
| C. | non-metals |
| D. | metalloids |
| Answer» B. metals | |
| 284. |
Phenol itself is |
| A. | toxic only |
| B. | caustic only |
| C. | harmless |
| D. | toxic and caustic |
| Answer» E. | |
| 285. |
Acid rain has effects on |
| A. | plants |
| B. | building |
| C. | drinking water |
| D. | all of above |
| Answer» E. | |
| 286. |
Large molecules made up of small monomers are called |
| A. | peptides |
| B. | polymers |
| C. | peptones |
| D. | monomers |
| Answer» C. peptones | |
| 287. |
At room temperatures, the better electrical conductor is |
| A. | Silicon (Si) |
| B. | Germanium (Ge) |
| C. | Carbon (C ) |
| D. | Tin (Sn) |
| Answer» E. | |
| 288. |
The bond breakage in Chlorofluorocarbons (CFC) molecules releases highly reactive |
| A. | chlorine radicals |
| B. | chlorine free radicals |
| C. | free electrons |
| D. | free ions |
| Answer» C. free electrons | |
| 289. |
Nucleophilic substitution reaction takes place when Halogenoalkanes is added with an aqueous solution of |
| A. | sodium chloride |
| B. | sodium magnate |
| C. | sodium hydroxide |
| D. | sodium chlorate |
| Answer» D. sodium chlorate | |
| 290. |
The addition of polymers functional groups may be present at/with the |
| A. | end |
| B. | terminal |
| C. | side-chain |
| D. | none of above |
| Answer» D. none of above | |
| 291. |
Wallace Carothers invented |
| A. | polymers |
| B. | nylon |
| C. | caprolactum |
| D. | carboxylic acids |
| Answer» C. caprolactum | |
| 292. |
In the periodic table, element in the second row of transition elements beneath titanium is |
| A. | Zinc (Zn) |
| B. | Zirconium (Zr) |
| C. | Scandium (Sc) |
| D. | Copper (Cu) |
| Answer» D. Copper (Cu) | |
| 293. |
The atomic radius of silicon is |
| A. | 0.117 |
| B. | 0.112 |
| C. | 0.104 |
| D. | 0.125 |
| Answer» B. 0.112 | |
| 294. |
Iodine is the least volatile Halogen, due to |
| A. | complex molecular structure |
| B. | greater number of electrons in the principal outermost electron shell |
| C. | strong Van der Waals forces |
| D. | none of above |
| Answer» D. none of above | |
| 295. |
Chemically chlorofluorocarbons are |
| A. | inert |
| B. | reactive |
| C. | versatile |
| D. | instable |
| Answer» B. reactive | |
| 296. |
In case of electric conductivity, Silicon (Si) is a |
| A. | semi-conductor |
| B. | conductor |
| C. | insulator |
| D. | semi-insulator |
| Answer» B. conductor | |
| 297. |
The carbonates and nitrates of group II elements decompose upon |
| A. | heating |
| B. | mixing |
| C. | reactions |
| D. | none of above |
| Answer» B. mixing | |
| 298. |
The waxy layer of plants are attacked which increases water loss hence making it prone to pest and bacteria which is due to |
| A. | chemicals |
| B. | acid rain |
| C. | fertilizers |
| D. | none of above |
| Answer» C. fertilizers | |
| 299. |
Going across period the first ionization energy |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | constant |
| Answer» B. decreases | |
| 300. |
Oxidation state +2 is obtained by losing 2 electrons from |
| A. | 2s |
| B. | 4s |
| C. | 2p |
| D. | d |
| Answer» C. 2p | |