MCQOPTIONS
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MCQOPTIONS
This section includes 402 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Chemical reactivities and chemical combinations depend upon |
| A. | physical property |
| B. | electronic configuration |
| C. | separation of elements |
| D. | natural property |
| Answer» C. separation of elements | |
| 252. |
In a molecule of chlorine trifluoride, ClF₃ the bond angle is |
| A. | 87.5° |
| B. | 107.5° |
| C. | 78.5° |
| D. | 107.5° |
| Answer» B. 107.5° | |
| 253. |
The bond angle of ClF₃ is |
| A. | 109.5° |
| B. | 104.5° |
| C. | 120° |
| D. | 87.5° |
| Answer» E. | |
| 254. |
Volatility refers to the |
| A. | rigidity of substances |
| B. | malleability |
| C. | ductability |
| D. | melting point of substances |
| Answer» E. | |
| 255. |
The Ionic radius of hydrogen in pm is |
| A. | 207 |
| B. | 208 |
| C. | 205 |
| D. | 206 |
| Answer» C. 205 | |
| 256. |
Ions are held together through |
| A. | physical attraction among electrons |
| B. | high kinetic energies of electrons |
| C. | electro-static attraction between ions |
| D. | static attraction between ions |
| Answer» D. static attraction between ions | |
| 257. |
Ionization energies is influenced by proton number of atom, of |
| A. | molecular charge |
| B. | electron charge |
| C. | nuclear charge |
| D. | proton charge |
| Answer» D. proton charge | |
| 258. |
Atomic number of potassium is |
| A. | 17 |
| B. | 19 |
| C. | 16 |
| D. | 18 |
| Answer» C. 16 | |
| 259. |
Substances inside fire extinguishers are examples of |
| A. | ionic bonds |
| B. | covalent bonds |
| C. | metallic bonds |
| D. | dative bond |
| Answer» C. metallic bonds | |
| 260. |
Lone pairs in Sulphur hexafluoride are |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 261. |
In BF₃ molecular structure, the bond angles are |
| A. | 180° |
| B. | 87.5° |
| C. | 120° |
| D. | 109.5° |
| Answer» D. 109.5° | |
| 262. |
Compounds evaporating easily and giving off a smell are |
| A. | ionic compounds |
| B. | covalent bonds |
| C. | metallic bonds |
| D. | dative bonds |
| Answer» C. metallic bonds | |
| 263. |
Due to mobile valence electrons, |
| A. | metals are rigid |
| B. | metals are not rigid |
| C. | metals are poor electrolytes |
| D. | metals are poor insulators |
| Answer» C. metals are poor electrolytes | |
| 264. |
Common covalent bonds include |
| A. | MgO |
| B. | KF |
| C. | LiCl |
| D. | CH₄ |
| Answer» E. | |
| 265. |
Bonding structure refers to the |
| A. | elements forming it |
| B. | arrangement of electrons |
| C. | arrangement of resulting particles |
| D. | water of crystallization |
| Answer» D. water of crystallization | |
| 266. |
Valence electron of Li lies in shell |
| A. | 1s |
| B. | 2s |
| C. | 3s |
| D. | 4s |
| Answer» C. 3s | |
| 267. |
In water, the greater electron repulsion is in between |
| A. | lone pair-bond pair |
| B. | bond pair-bond pair |
| C. | lone pair-lone pair |
| D. | Pi-bonds |
| Answer» D. Pi-bonds | |
| 268. |
First ionization energy of K is |
| A. | 418kJmol |
| B. | 419kJmol |
| C. | 417kJmol |
| D. | 416kJmol |
| Answer» C. 417kJmol | |
| 269. |
Covalent radius of carbon is |
| A. | 77.2pm |
| B. | 77.3pm |
| C. | 77.5pm |
| D. | 77.4pm |
| Answer» C. 77.5pm | |
| 270. |
The bond angles in methane (CH₄) are |
| A. | 180° |
| B. | 87.5° |
| C. | 120° |
| D. | 109.5° |
| Answer» E. | |
| 271. |
Cationic radius decreases when effective nuclear charge on ion |
| A. | remain same |
| B. | decrease |
| C. | increase |
| D. | fluctuate |
| Answer» D. fluctuate | |
| 272. |
In comparison of electronegativity values increase in a period with decrease in (structure O) |
| A. | atomic size |
| B. | atomic radius |
| C. | atomic number |
| D. | ionic radius |
| Answer» B. atomic radius | |
| 273. |
After loss an electron potassium attains configuration of |
| A. | Argon |
| B. | neon |
| C. | xenon |
| D. | helium |
| Answer» B. neon | |
| 274. |
Electropositive elements are at a higher energy state then the |
| A. | ionic radii |
| B. | electronegative elements |
| C. | neutral elements |
| D. | atomic radii |
| Answer» C. neutral elements | |
| 275. |
From top to bottom in a group of periodic table atomic radii |
| A. | decrease |
| B. | increase |
| C. | remain same |
| D. | fluctuate |
| Answer» C. remain same | |
| 276. |
Atomic number of sodium is |
| A. | 12 |
| B. | 15 |
| C. | 16 |
| D. | 11 |
| Answer» E. | |
| 277. |
Force of which ultimately results in difficult removal of electron is |
| A. | attraction force |
| B. | repulsive force |
| C. | electric force |
| D. | nuclear force |
| Answer» B. repulsive force | |
| 278. |
bond formed by elements of widely different electro negativities is |
| A. | covalent |
| B. | hydrogen |
| C. | ionic radii |
| D. | double covalent |
| Answer» D. double covalent | |
| 279. |
Electron has |
| A. | sharp boundary |
| B. | circular boundary |
| C. | boundary near nucleus |
| D. | no boundary |
| Answer» E. | |
| 280. |
After conversion of Na+ ion radius of Na atom reduces from |
| A. | 186pm to 95pm |
| B. | 185pm to 95pm |
| C. | 186pm to 96pm |
| D. | 187pm to 94pm |
| Answer» B. 185pm to 95pm | |
| 281. |
Electro negativity of sodium atom is |
| A. | 0.6 |
| B. | 0.9 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» C. 0.7 | |
| 282. |
Probability distribution of electrons can be affected by |
| A. | far atoms |
| B. | near atoms |
| C. | each and every atom |
| D. | neighboring atoms |
| Answer» E. | |
| 283. |
In which period decrease of atomic radii is very prominent? |
| A. | second |
| B. | third |
| C. | first |
| D. | fourth |
| Answer» B. third | |
| 284. |
Electron affinity of potassium atom is |
| A. | −45 |
| B. | −46 |
| C. | −48 |
| D. | −47 |
| Answer» D. −47 | |
| 285. |
Ionic radius of Cl- ion increases from |
| A. | 99pm to 181pm |
| B. | 19pm to 81pm |
| C. | 81pm to 99pm |
| D. | 181pm to 199pm |
| Answer» B. 19pm to 81pm | |
| 286. |
When atomic radius increases electron affinity |
| A. | decreases |
| B. | increases |
| C. | neutral |
| D. | no effect |
| Answer» B. increases | |
| 287. |
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 | |
| 288. |
Electro negativity is related to ionization energy of element and |
| A. | atomic radii |
| B. | electron affinity |
| C. | ionic radii |
| D. | nucleus |
| Answer» C. ionic radii | |
| 289. |
Covalent radius of hydrogen is |
| A. | 37.3pm |
| B. | 37.6pm |
| C. | 37.7pm |
| D. | 37.8pm |
| Answer» D. 37.8pm | |
| 290. |
Electron affinity of chlorine is |
| A. | −346 |
| B. | −349 |
| C. | −347 |
| D. | −348 |
| Answer» C. −347 | |
| 291. |
In group from top to bottom electron affinity |
| A. | increases |
| B. | decreases |
| C. | remain same |
| D. | fluctuate |
| Answer» C. remain same | |
| 292. |
Increase in atomic number is leads to a stronger force of attraction between nucleus and increasing number of |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | none of these |
| Answer» B. protons | |
| 293. |
Shielding effect is responsible for decrease in force of attraction of nucleus for electrons present I the |
| A. | outer most shell |
| B. | inner shell |
| C. | valence shell |
| D. | second shell |
| Answer» D. second shell | |
| 294. |
Positive charge holds electrons more tightly thus removal of electrons become more |
| A. | easy |
| B. | difficult |
| C. | neutral |
| D. | natural |
| Answer» C. neutral | |
| 295. |
In fluorine, incoming electrons are repel by the |
| A. | thick cloud |
| B. | outer most shell |
| C. | nucleus |
| D. | atomic radii |
| Answer» B. outer most shell | |
| 296. |
Electro negativity values of elements is calculated by |
| A. | bohar |
| B. | Paul |
| C. | Zeeman |
| D. | stalk |
| Answer» C. Zeeman | |
| 297. |
From left to right in a period, shielding effect remains |
| A. | same |
| B. | different |
| C. | increase |
| D. | decrease |
| Answer» B. different | |
| 298. |
Atom which donates major share of its electrons in formation of HF is |
| A. | fluorine |
| B. | hydrogen |
| C. | nitrogen |
| D. | chlorine |
| Answer» C. nitrogen | |
| 299. |
Sign given to electron affinity is |
| A. | positive |
| B. | negative |
| C. | neutral |
| D. | no sign |
| Answer» C. neutral | |
| 300. |
A similar type of bond is expected between elements of group |
| A. | IA and IIA |
| B. | IIA and VIA |
| C. | IIIA and VA |
| D. | IA and IIIA |
| Answer» C. IIIA and VA | |