MCQOPTIONS
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MCQOPTIONS
This section includes 335 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
The electron affinity of oxygen atom is |
| A. | −143 |
| B. | −142 |
| C. | −141 |
| D. | −144 |
| Answer» D. −144 | |
| 202. |
the atomic radius of helium in pm is |
| A. | 32 |
| B. | 36 |
| C. | 35 |
| D. | 31 |
| Answer» E. | |
| 203. |
The bond formed by the elements of widely different electro negativities is |
| A. | covalent |
| B. | hydrogen |
| C. | ionic radii |
| D. | double covalent |
| Answer» D. double covalent | |
| 204. |
The first ionization energy of sodium is |
| A. | 465 |
| B. | 457 |
| C. | 497 |
| D. | 496 |
| Answer» E. | |
| 205. |
The force of attraction which held together the oppositely charged K and Cl ions is |
| A. | electrostatic force |
| B. | electromagnetic |
| C. | dipole dipole |
| D. | intermolecular |
| Answer» B. electromagnetic | |
| 206. |
Iron metal in the form of steel can even be corroded by |
| A. | aerosols |
| B. | acid rain |
| C. | pollution |
| D. | rain |
| Answer» C. pollution | |
| 207. |
The important part of atom which is related to many physical and chemical properties is its |
| A. | size |
| B. | mass |
| C. | nucleus |
| D. | protons |
| Answer» B. mass | |
| 208. |
The second electron is removed from a positively charged ion rather then a |
| A. | positive atom |
| B. | neutral atom |
| C. | negative atom |
| D. | nucleus |
| Answer» C. negative atom | |
| 209. |
The electro negativity of oxygen atom is |
| A. | 3.2 |
| B. | 3.3 |
| C. | 3.4 |
| D. | 3.5 |
| Answer» E. | |
| 210. |
The overlapping of one modified orbital linearly on another orbital creates a bond called |
| A. | pi bond |
| B. | sigma bond |
| C. | none |
| D. | both a and b |
| Answer» C. none | |
| 211. |
The insufficient gap between 1st and 2nd ionization energies shows the valence |
| A. | two |
| B. | three |
| C. | one |
| D. | four |
| Answer» D. four | |
| 212. |
The bond length in C-O is |
| A. | 0.143 |
| B. | 0.154 |
| C. | 0.116 |
| D. | 0.134 |
| Answer» B. 0.154 | |
| 213. |
The atomic number of Argon is |
| A. | 16 |
| B. | 18 |
| C. | 11 |
| D. | 12 |
| Answer» C. 11 | |
| 214. |
The index character of ionization energy is |
| A. | metallic |
| B. | electric |
| C. | positive |
| D. | negative |
| Answer» B. electric | |
| 215. |
The ionization energy which is required to remove the third electron after removal of second electron is |
| A. | first |
| B. | third |
| C. | second |
| D. | fourth |
| Answer» C. second | |
| 216. |
The transfer of electrons from higher energy state to a lower energy state is the responsibility of |
| A. | energy difference |
| B. | electron affinity |
| C. | electro negativity |
| D. | a and c |
| Answer» B. electron affinity | |
| 217. |
In a group of periodic table the nuclear charge |
| A. | increase |
| B. | decrease |
| C. | neutral |
| D. | remain same |
| Answer» B. decrease | |
| 218. |
The amount of energy which is evolved in the bind formation is |
| A. | 436.44kJmol-1 |
| B. | 436.45kJmol-1 |
| C. | 436.43kJmol-1 |
| D. | 436.46kJmol-1 |
| Answer» C. 436.43kJmol-1 | |
| 219. |
The stable noble gas which lies near to the F is |
| A. | Xenon |
| B. | Neon |
| C. | helium |
| D. | Argon |
| Answer» C. helium | |
| 220. |
Shapes of molecules are formed by |
| A. | chemical combinations |
| B. | forming gases |
| C. | separation |
| D. | none |
| Answer» B. forming gases | |
| 221. |
The first ionization energy of carbon is |
| A. | 1084 |
| B. | 1085 |
| C. | 1086 |
| D. | 1087 |
| Answer» D. 1087 | |
| 222. |
the atomic radius of hydrogen in pm is |
| A. | 37 |
| B. | 32 |
| C. | 31 |
| D. | 43 |
| Answer» B. 32 | |
| 223. |
When the pair of electrons is equally shared due to same electro negativity between atoms the covalent bond is |
| A. | non-polar |
| B. | polar |
| C. | none |
| D. | both a and b |
| Answer» B. polar | |
| 224. |
The period ends with an element which has complete its |
| A. | inner most shell |
| B. | electronic shell |
| C. | middle shell |
| D. | none |
| Answer» D. none | |
| 225. |
Electrovalent bond is another name for |
| A. | ionic bond |
| B. | covalent bond |
| C. | none |
| D. | both a and b |
| Answer» B. covalent bond | |
| 226. |
he atomic number of chromium is |
| A. | 25 |
| B. | 24 |
| C. | 26 |
| D. | 27 |
| Answer» C. 26 | |
| 227. |
The first ionization energy of hydrogen is |
| A. | 1313 |
| B. | 1212 |
| C. | 1111 |
| D. | 1414 |
| Answer» B. 1212 | |
| 228. |
The stable noble gas which lies near to the S is |
| A. | Neon |
| B. | helium |
| C. | Argon |
| D. | Xenon |
| Answer» D. Xenon | |
| 229. |
The force of attraction decreases due to increasing of |
| A. | stark effect |
| B. | shielding effect |
| C. | screening effect |
| D. | Zeeman effect |
| Answer» C. screening effect | |
| 230. |
The first ionization energy oxygen of is |
| A. | 1312 |
| B. | 1314 |
| C. | 1313 |
| D. | 1315 |
| Answer» C. 1313 | |
| 231. |
When the force of attraction decreases the electron affinity |
| A. | remain same |
| B. | increases |
| C. | decreases |
| D. | none |
| Answer» D. none | |
| 232. |
When two Hydrogen atoms approach each other, forces of attraction and repulsion operate |
| A. | vertically |
| B. | horizontally |
| C. | simultaneously |
| D. | none |
| Answer» D. none | |
| 233. |
After loss an electron potassium attains the configuration of |
| A. | Argon |
| B. | neon |
| C. | xenon |
| D. | helium |
| Answer» B. neon | |
| 234. |
The valence electron of Li lies in the shell |
| A. | 1s |
| B. | 2s |
| C. | 3s |
| D. | 4s |
| Answer» C. 3s | |
| 235. |
Electron has |
| A. | sharp boundary |
| B. | circular boundary |
| C. | boundary near nucleus |
| D. | no boundary |
| Answer» E. | |
| 236. |
The value of radii of cation and anion is |
| A. | c+ and c- |
| B. | a+ and a- |
| C. | r+ and r- |
| D. | none |
| Answer» D. none | |
| 237. |
The tendency of an atom to attract a shared electron pair towards itself is called its |
| A. | electron affinity |
| B. | ionization energy |
| C. | electro negativity |
| D. | atomic radii |
| Answer» D. atomic radii | |
| 238. |
The region outside nucleus where electrons revolves is called |
| A. | quantum shell |
| B. | energy level |
| C. | none |
| D. | both a and b |
| Answer» E. | |
| 239. |
The covalent bond between the two atoms is non-polar when the difference of electro negativity is |
| A. | one |
| B. | two |
| C. | three |
| D. | zero |
| Answer» E. | |
| 240. |
Nitric acid is made from |
| A. | nitrogen |
| B. | ammonium |
| C. | ammonia |
| D. | nitrate |
| Answer» D. nitrate | |
| 241. |
Light weight batteries which produce high voltage are |
| A. | aluminum air batteries |
| B. | nickel cadmium cells |
| C. | none |
| D. | both a and b |
| Answer» B. nickel cadmium cells | |
| 242. |
The atom which donates the major share of its electrons in the formation of HF is |
| A. | fluorine |
| B. | hydrogen |
| C. | both |
| D. | none |
| Answer» C. both | |
| 243. |
The covalent radius of hydrogen is |
| A. | 37.3pm |
| B. | 37.6pm |
| C. | 37.7pm |
| D. | 37.8pm |
| Answer» D. 37.8pm | |
| 244. |
The temperature at which thermal decomposition of metal nitrates of Group II takes place |
| A. | increases down the group |
| B. | increases along the Period2 |
| C. | remains constant across the Group II metals |
| D. | decreases down the group |
| Answer» B. increases along the Period2 | |
| 245. |
The ionic radius of metals is formed by |
| A. | positive ion |
| B. | negative ion |
| C. | neutral ion |
| D. | normal atoms |
| Answer» B. negative ion | |
| 246. |
Polyester made by on single type of monomer, lactic acid is called |
| A. | nylon |
| B. | PLA |
| C. | fiber |
| D. | caprolactum |
| Answer» C. fiber | |
| 247. |
The shielding effect is also called |
| A. | stark effect |
| B. | screening effect |
| C. | Zeeman effect |
| D. | none |
| Answer» C. Zeeman effect | |
| 248. |
The ionic radius for the elements of group number VA to VIIA is formed by |
| A. | negative ions |
| B. | neutral ions |
| C. | normal atom |
| D. | neutral ion |
| Answer» B. neutral ions | |
| 249. |
The greater size of an ion is depend upon the greater amount of |
| A. | negative charge |
| B. | positive charge |
| C. | neutral charge |
| D. | none |
| Answer» B. positive charge | |
| 250. |
The arrangement of BF3 molecules are |
| A. | tetrahedral |
| B. | linear |
| C. | trigonal |
| D. | hexagonal |
| Answer» D. hexagonal | |