MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1262 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
In solvent extraction ether is used to separate products of organic synthesis from________________? |
| A. | water |
| B. | iodine |
| C. | hydrochloric acid |
| D. | gases |
| Answer» B. iodine | |
| 202. |
The use of CaCl2 and PCl5 in the process of crystallization is as a____________________? |
| A. | oxidizing agent |
| B. | reducing agent |
| C. | drying agent |
| D. | colouring agent |
| Answer» D. colouring agent | |
| 203. |
Without suction pump filtration is __________________? |
| A. | Fast process |
| B. | Slow process |
| C. | Rapid process |
| D. | All are possible |
| Answer» C. Rapid process | |
| 204. |
Selection of filter paper depends on size of particles to be________________? |
| A. | filtered |
| B. | dried |
| C. | decolorized |
| D. | decanted |
| Answer» B. dried | |
| 205. |
Identification of the components of a sample is_________________? |
| A. | Quantitative analysis |
| B. | Qualitative analysis |
| C. | Stoichiometry |
| D. | Physical chemistry |
| Answer» C. Stoichiometry | |
| 206. |
Different components of a mixture have different Rf values due to________________? |
| A. | Polar solvent used |
| B. | Combination of solvents used |
| C. | Their different distribution coefficients in the solvent |
| D. | Distributive law |
| Answer» D. Distributive law | |
| 207. |
Which of the following way in used for classification of chromatography ? |
| A. | Shape |
| B. | Phase |
| C. | Mechanism |
| D. | All |
| Answer» E. | |
| 208. |
Safe and the most reliable method of drying crystals is through_________________? |
| A. | Filter paper |
| B. | Vacuum desiccators |
| C. | Oven |
| D. | None of these |
| Answer» C. Oven | |
| 209. |
Which one is not the absolute term of the element _________________ ? |
| A. | Ionization energy |
| B. | Electron affinity |
| C. | Electro negativity |
| D. | Atomic size |
| Answer» D. Atomic size | |
| 210. |
The solvent or mixture of solvents used for separation of compounds is called____________________? |
| A. | Stationary phase |
| B. | Mobile phase |
| C. | Dynamic phase |
| D. | Static phase |
| Answer» C. Dynamic phase | |
| 211. |
Which is not a sublime material_______________? |
| A. | Iodine |
| B. | Benzoic acid |
| C. | Ammonium chloride |
| D. | Potash alum |
| Answer» E. | |
| 212. |
Shaking two immiscible liquids increases_________________? |
| A. | Length of contact |
| B. | Volume of contact |
| C. | Area of contact |
| D. | all of above |
| Answer» D. all of above | |
| 213. |
The octet rule does not always hold for which of the following elements _________________? |
| A. | C |
| B. | O |
| C. | F |
| D. | P |
| Answer» E. | |
| 214. |
The ionization energy__________________? |
| A. | Generally increases from left to right in a period |
| B. | Does not change in a period |
| C. | Increase from top to bottom in a group |
| D. | Does not change in a group |
| Answer» B. Does not change in a period | |
| 215. |
Which type of bond is formed by overlap of p orbitals _______________? |
| A. | Pi |
| B. | Sigma |
| C. | Both |
| D. | Neither |
| Answer» D. Neither | |
| 216. |
In O2 each oxygen atom is hybridized_________________? |
| A. | sp3 |
| B. | sp2 |
| C. | sp |
| D. | All |
| Answer» C. sp | |
| 217. |
In crystallization if the solvent is inflammable then direct heating is________________? |
| A. | needed |
| B. | avoided |
| C. | depends on temperature |
| D. | crystallization does not involve heating |
| Answer» C. depends on temperature | |
| 218. |
Which of the following is the best explanation that CO2 is non polar molecule __________________? |
| A. | Linear geometry |
| B. | Dipole moment is zero |
| C. | Sp hybridization |
| D. | None |
| Answer» C. Sp hybridization | |
| 219. |
Silica gel and alumina are used as __________________? |
| A. | Mobile phase |
| B. | Stationary phase |
| C. | Mixed phase |
| D. | Single phase |
| Answer» C. Mixed phase | |
| 220. |
Rate of filtration can be increased by applying gentle suction______________? |
| A. | Gooch crucible |
| B. | Filter paper |
| C. | Sintered crucible |
| D. | All of the above |
| Answer» C. Sintered crucible | |
| 221. |
Sintered glass is a porous material used for ___________________? |
| A. | absorption |
| B. | adsorption |
| C. | filtration |
| D. | sublimation |
| Answer» D. sublimation | |
| 222. |
Which is not related pair of term used in analytical techniques________________? |
| A. | Filtrate residue |
| B. | Sublimate sublimation |
| C. | Drying desiccator |
| D. | Separating funnel mother liquor |
| Answer» C. Drying desiccator | |
| 223. |
Measurement of the degree of polarity is___________________? |
| A. | Electron affinity |
| B. | Ionic character |
| C. | Ionization energy |
| D. | Dipole moment |
| Answer» E. | |
| 224. |
The major steps involved in complete quantitative analysis are _________________? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 225. |
Size of filter paper is selected according to the amount of__________________? |
| A. | solution |
| B. | amount of insoluble solute |
| C. | amount of soluble solute |
| D. | Amount of solvent |
| Answer» C. amount of soluble solute | |
| 226. |
When electrons collide with heavy metals than ___________ are produced? |
| A. | Beta-rays |
| B. | Alpha-rays |
| C. | X-rays |
| D. | Gamma-rays |
| Answer» D. Gamma-rays | |
| 227. |
The tip of funnel should touch the wall of the breaker in order to avoid____________________? |
| A. | Inconsistent flow of filtration |
| B. | splashing |
| C. | premature crystallization |
| D. | all of above |
| Answer» C. premature crystallization | |
| 228. |
Sintered crucible is made up of________________? |
| A. | Plastic |
| B. | glass |
| C. | porcetain |
| D. | fiber |
| Answer» C. porcetain | |
| 229. |
Ratio of the amount of solute in organic and aqueous solvent is________________? |
| A. | Retardation factor |
| B. | Distribution co-efficient |
| C. | Distribution in aqueous solution |
| D. | All statements are wrong |
| Answer» C. Distribution in aqueous solution | |
| 230. |
Which of the following technique is simple and efficient to purify a substance____________________? |
| A. | Filtration |
| B. | Sublimation |
| C. | Crystallization |
| D. | Solvent extraction |
| Answer» E. | |
| 231. |
Separation of a solid from its hot saturated solution by cooling is called__________________? |
| A. | vapourization |
| B. | solvent extraction |
| C. | filtration |
| D. | crystallization |
| Answer» E. | |
| 232. |
Neutrons moving with an energy of 1.2 MeV are called_______________? |
| A. | Fast neutrons |
| B. | Slow neutrons |
| C. | Moderate neutrons |
| D. | All are possible |
| Answer» B. Slow neutrons | |
| 233. |
95% ethanol is called_________________? |
| A. | methylated spirit |
| B. | wood spirit |
| C. | rectified spirit |
| D. | absolute alcohol |
| Answer» D. absolute alcohol | |
| 234. |
Which of the following technique is used for the separation of insoluble particles from liquids ? |
| A. | Filtration |
| B. | Crystallization |
| C. | Solvent extraction |
| D. | Chromatography |
| Answer» B. Crystallization | |
| 235. |
Animal charcoal adsorbs the coloured_________________? |
| A. | impurities |
| B. | crystals |
| C. | solvents |
| D. | both A & B |
| Answer» B. crystals | |
| 236. |
When 6d orbital is complete the entering electron goes into_________________? |
| A. | 7f |
| B. | 7s |
| C. | 7p |
| D. | 7d |
| Answer» D. 7d | |
| 237. |
Fluted filter paper is used to__________________? |
| A. | Filter hot solution |
| B. | Avoid premature crystallization |
| C. | Increase the rate of filtration |
| D. | Decrease the area |
| Answer» D. Decrease the area | |
| 238. |
Pfund series are produced in the spectrum of hydrogen atom__________________? |
| A. | when electrons jump down to 2nd- orbit |
| B. | when electrons jump down to 3rd- orbit |
| C. | when electrons jump down to 4th- orbit |
| D. | when electrons jump down to 5th- orbit |
| Answer» E. | |
| 239. |
A technique of partition chromatography in which the solvent is in a pool at the bottom of container_______________? |
| A. | Adsorption chromatography |
| B. | Ascending chromatography |
| C. | Radial chromatography |
| D. | Descending chromatography |
| Answer» C. Radial chromatography | |
| 240. |
Sommerfelds modification in Bohrs model is_______________? |
| A. | Orbit is cylindrical |
| B. | Orbit is elliptical |
| C. | Orbit is longitudinal |
| D. | Orbit is asymmetrical |
| Answer» C. Orbit is longitudinal | |
| 241. |
Wavelength of electron was verified by_________________? |
| A. | Moseley |
| B. | Davisson and Germer |
| C. | Einstein |
| D. | Roentgen |
| Answer» C. Einstein | |
| 242. |
Positive rays are produced__________________? |
| A. | By burning of gas |
| B. | By cooling of the gas |
| C. | By the bombardment of cathode rays on gas molecules |
| D. | From anode like cathode rays produced from cathode |
| Answer» D. From anode like cathode rays produced from cathode | |
| 243. |
Space around nucleus where finding probability of electrons is maximum is called ____________________? |
| A. | Orbital |
| B. | Orbit is elliptical |
| C. | subshell |
| D. | Electron cloud |
| Answer» B. Orbit is elliptical | |
| 244. |
Atom with higher atomic number produces X-rays of__________________? |
| A. | Shorter wavelength |
| B. | Larger wavelength |
| C. | X-ray not produced |
| D. | All are possible |
| Answer» B. Larger wavelength | |
| 245. |
Splitting of spectral lines when atoms are subjected to strong electric filed is called_________________? |
| A. | Zeeman effect |
| B. | Stark effect |
| C. | Photoelectric effect |
| D. | Compton effect |
| Answer» C. Photoelectric effect | |
| 246. |
The letters s p d and f are used to represent which quantum numbers________________? |
| A. | Principal |
| B. | Azimuthal |
| C. | Magnetic |
| D. | Spin |
| Answer» C. Magnetic | |
| 247. |
The relationship between energy of a photon of light and its frequency is given by________________? |
| A. | de-Broglie duel nature of matter |
| B. | Bohrs model |
| C. | Plancks Quantum theory |
| D. | Rutherfords atomic model |
| Answer» D. Rutherfords atomic model | |
| 248. |
Colour of fluorescene produced by cathode rays depends upon________________? |
| A. | Temperature |
| B. | Pressure |
| C. | Volume |
| D. | Composition of glass |
| Answer» E. | |
| 249. |
The velocity of the photon____________________? |
| A. | Is independent of wavelength |
| B. | Depends upon source |
| C. | Depends upon its frequency |
| D. | Equals to the square of amplitude |
| Answer» B. Depends upon source | |
| 250. |
Electronic configuration of K is_________________? |
| A. | [Ar]4s2 |
| B. | [Ar]4s1 |
| C. | [Kr]5s1 |
| D. | [He]2s1 |
| Answer» C. [Kr]5s1 | |