MCQOPTIONS
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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.
| 251. |
Angle of deflection was studied by________________? |
| A. | Hitorff |
| B. | Stoney |
| C. | William Crookes |
| D. | J.Perrin |
| Answer» E. | |
| 252. |
Splitting of spectral lines when atom is subjected to magnetic field is called _______________? |
| A. | Zeemans effect |
| B. | Starks effect |
| C. | Photo electric effect |
| D. | Compton effect |
| Answer» B. Starks effect | |
| 253. |
Milikan used ______________ in his atomizer? |
| A. | Milk |
| B. | Honey |
| C. | Oil |
| D. | Water |
| Answer» D. Water | |
| 254. |
Rutherfords planet like structure was defective and unsatisfactory because_________________? |
| A. | Moving e- accelerate towards the nucleus |
| B. | Continuous spectrum |
| C. | behavior of electron remain unexplained |
| D. | all |
| Answer» E. | |
| 255. |
Which one of the following explain the shape of orbitals _________________? |
| A. | Principal of quantum number |
| B. | Azimuthal quantum number |
| C. | Magnetic quantum number |
| D. | Spin quantum number |
| Answer» C. Magnetic quantum number | |
| 256. |
Pressure in gas discharge tube was kept________________? |
| A. | 10 torr |
| B. | 1 torr |
| C. | 0.1 torr |
| D. | 0.01 torr |
| Answer» E. | |
| 257. |
The conversion of vapours back into their liquid state is called__________________? |
| A. | crystallization |
| B. | evaporization |
| C. | vaporization |
| D. | condensation |
| Answer» E. | |
| 258. |
Liquid crystal is discovered by __________________? |
| A. | William Crooks |
| B. | Fredrack Reinitzer |
| C. | J.J Thomson |
| D. | Bravis |
| Answer» C. J.J Thomson | |
| 259. |
Positive rays give flash on________________? |
| A. | AgNO3 plate |
| B. | AgCl plate |
| C. | ZnO |
| D. | ZnS |
| Answer» E. | |
| 260. |
The amount of heat absorbed when one mole of a liquid is changed into gas at its boiling point is_____________________? |
| A. | Molar heat of sublimation |
| B. | Molar heat of fusion |
| C. | Molar heat of vapourization |
| D. | Latent heat of that liquid |
| Answer» D. Latent heat of that liquid | |
| 261. |
The number amino acid units for each turn of helix on average are____________________? |
| A. | 21 |
| B. | 23 |
| C. | 25 |
| D. | 27 |
| Answer» E. | |
| 262. |
All of the following were theorized by Bohr in his description of the atom except__________________? |
| A. | Angular momentum of electrons in multiples of h/2? |
| B. | Electrons revolve in discrete circular orbits |
| C. | Energy of each electron is directly proportional to n2 |
| D. | Electrons radiate energy continuously in a given orbit. |
| Answer» E. | |
| 263. |
If a physical and chemical change takes place at a constant pressure then the heat change during the process is called__________________? |
| A. | Heat of transition |
| B. | Heat of fusion |
| C. | Enthalpy change |
| D. | All of above |
| Answer» D. All of above | |
| 264. |
When water freezes at 0°C its density decreases due to_______________? |
| A. | Change of bond angles |
| B. | Cubic structure of ice |
| C. | Empty space present in the structure of ice |
| D. | Change of bond length |
| Answer» D. Change of bond length | |
| 265. |
The boiling point increases down the zero group element due to_________________? |
| A. | Ion dipole forces |
| B. | London forces |
| C. | Hydrogen bonding |
| D. | Dipole dipole forces |
| Answer» C. Hydrogen bonding | |
| 266. |
Liquid gets the shape of the container when it is poured into it. Which one of the following reasons justifies it ? |
| A. | Liquid do not have definite shape |
| B. | Liquid do not have definite volume |
| C. | Liquid is highly compressible |
| D. | Liquid molecules can slide over each other |
| Answer» E. | |
| 267. |
Rising of a wetting liquid in a capillary tube is due to__________________? |
| A. | Surface tension |
| B. | Cohesive forces |
| C. | Adhesive forces |
| D. | viscosity |
| Answer» D. viscosity | |
| 268. |
During which process empty spaces between particles become minimum ? |
| A. | ionization |
| B. | condensation |
| C. | fusion |
| D. | evaporation |
| Answer» C. fusion | |
| 269. |
The number of formula units in 29.25g of common salt_________________? |
| A. | 6.022 x 1023 |
| B. | 3.01 x 1023 |
| C. | 2 x NA |
| D. | 4 x 6.022 x 1023 |
| Answer» C. 2 x NA | |
| 270. |
When the atoms of third layer are arranged in such a way that they directly lie above the atoms of first layer then this arrangement is called_________________? |
| A. | ABAB (hexagonal) |
| B. | ABCABC (Cubic) |
| C. | Orthor hombic |
| D. | Rhombohedral |
| Answer» B. ABCABC (Cubic) | |
| 271. |
The pressure during the molar heat of fusion is kept________________? |
| A. | 0 atmosphere |
| B. | one atmosphere |
| C. | 2 atmosphere |
| D. | 10 atmosphere |
| Answer» C. 2 atmosphere | |
| 272. |
All the enthalpy changes are________________? |
| A. | Negative |
| B. | Positive |
| C. | May or may not be A or B |
| D. | none |
| Answer» D. none | |
| 273. |
Which has strongest bonding in the solid state ? |
| A. | Hydrogen Chloride (HCI) |
| B. | Chlorine (Cl2) |
| C. | Xenon(Xe) |
| D. | Sodium Chloride (NaCI) |
| Answer» E. | |
| 274. |
Which one is false for evaporation ? |
| A. | Surface phenomenon |
| B. | Continuous |
| C. | Exothermic |
| D. | Cause cooling |
| Answer» D. Cause cooling | |
| 275. |
In order to mention the boiling point of water at 110°C the external pressure should be ? |
| A. | Between 760 torr and 1200 torr |
| B. | Between 200 torr and 760 torr |
| C. | 765 torr |
| D. | any value of pressure |
| Answer» B. Between 200 torr and 760 torr | |
| 276. |
CuSO4 + Zn?ZnSO4+Cu is___________________? |
| A. | Spontaneous reaction |
| B. | Non-spontaneous reaction |
| C. | Endothermic |
| D. | Exothermic |
| Answer» B. Non-spontaneous reaction | |
| 277. |
Vapour pressure of water at 100°C is___________________? |
| A. | 55 mm Hg |
| B. | 760 mm Hg |
| C. | 355 mm Hg |
| D. | 1489 mm Hg |
| Answer» C. 355 mm Hg | |
| 278. |
Which of the following has strongest intermolecular forces of attraction ? |
| A. | Hydrogen (H2) |
| B. | Chlorine (Cl2) |
| C. | lodine (I2) |
| D. | Methane (CH4) |
| Answer» D. Methane (CH4) | |
| 279. |
If we provide very high amount of heat to a liquid its boiling point will__________________? |
| A. | increase |
| B. | remains constant |
| C. | decrease |
| D. | there will be no boiling |
| Answer» C. decrease | |
| 280. |
When substance moves from a solid to a liquid state all of the following changes occur except__________________? |
| A. | Molecules become more disordered |
| B. | K.E of the molecules decreases |
| C. | Intermolecular forces become weaker |
| D. | Molecule become further separated |
| Answer» C. Intermolecular forces become weaker | |
| 281. |
State function the macroscopic property of system depends upon________________? |
| A. | path of reaction |
| B. | initial state |
| C. | final state |
| D. | initial and final state |
| Answer» E. | |
| 282. |
A single atom or group of atoms which gives characteristic properties to a compound is called_________________? |
| A. | radical |
| B. | hydrocarbon |
| C. | functional group |
| D. | ion |
| Answer» D. ion | |
| 283. |
The environment in which a system is studied is __________________? |
| A. | State function |
| B. | phase |
| C. | surrounding |
| D. | state |
| Answer» D. state | |
| 284. |
A reaction has values of ?H and ?S which are both positive. The reaction __________________? |
| A. | Is spontaneous |
| B. | Spontaneity is temperature dependent |
| C. | Has an increasing free energy |
| D. | Is non-spontaneous |
| Answer» E. | |
| 285. |
If internal energy of the system is increased ____________________? |
| A. | Change in state of the system is increased |
| B. | Temperature of the ystem may rise |
| C. | Chemical reaction may take place |
| D. | All |
| Answer» E. | |
| 286. |
Purines and pyrimidines are_________________? |
| A. | Enzymes |
| B. | Nitrogenous bases |
| C. | Carbohydrates |
| D. | Lipids |
| Answer» C. Carbohydrates | |
| 287. |
Introduction of nitro group in a molecule is called___________________? |
| A. | nitration |
| B. | halogenation |
| C. | sulphonation |
| D. | amination |
| Answer» B. halogenation | |
| 288. |
In a group, atomic radii increase due to successive increase of _________ ? |
| A. | Electronic shells |
| B. | Proton shells |
| C. | Neutron shells |
| D. | Nucleus |
| Answer» B. Proton shells | |
| 289. |
Reaction in which heat evolves is called ____________________? |
| A. | endothermic |
| B. | spontaneous |
| C. | non-spontaneous |
| D. | exothermic |
| Answer» E. | |
| 290. |
Which element has same isotopes like palladium___________________? |
| A. | Nickel |
| B. | Calcium |
| C. | Cadmium |
| D. | Tin |
| Answer» C. Cadmium | |
| 291. |
Which of the following is an amide________________? |
| A. | R-NH2 |
| B. | RCONH2 |
| C. | R – NH – R |
| D. | C6H5NH2 |
| Answer» C. R – NH – R | |
| 292. |
Anything which depends upon initial and final state of a system is_______________? |
| A. | environment |
| B. | surrounding |
| C. | state function |
| D. | enthalpy |
| Answer» D. enthalpy | |
| 293. |
Octane number 2 2 4-trimethyl pentane is________________? |
| A. | 100 |
| B. | 90 |
| C. | 80 |
| D. | 70 |
| Answer» B. 90 | |
| 294. |
Ether functional group can be represented as ____________________? |
| A. | OH |
| B. | R-CO-R |
| C. | R-O-R |
| D. | R-COOH |
| Answer» D. R-COOH | |
| 295. |
Which one of the following compounds shows intense knocking ? |
| A. | n-pentane |
| B. | iso-heptane |
| C. | iso-octane |
| D. | n-heptane |
| Answer» E. | |
| 296. |
2-propanol and 1-propanol show the isomerism________________? |
| A. | metamerism |
| B. | functional group isomerism |
| C. | geometric isomerism |
| D. | position isomerism |
| Answer» E. | |
| 297. |
Pentane and 2-methyl butance have the same_______________? |
| A. | Boiling point |
| B. | Melting point |
| C. | Percentage composition |
| D. | Structural formula |
| Answer» D. Structural formula | |
| 298. |
Which of the following can be used as anti-knocking agent ? |
| A. | PbCl2 |
| B. | (C2H5)4 Pb |
| C. | (C2H5)2 Pb |
| D. | all of the above |
| Answer» C. (C2H5)2 Pb | |
| 299. |
The first organic compound was synthesized in laboratory by_________________? |
| A. | Wohler |
| B. | Kolbe |
| C. | Berzilius |
| D. | Berthelot |
| Answer» B. Kolbe | |
| 300. |
Propene can exhibit________________? |
| A. | cis-trans isomerism |
| B. | geometric isomerism |
| C. | both a & b |
| D. | none of the above |
| Answer» E. | |