chemistry MCQs – Page 11

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
201. Enthalpy of a reaction can be measured by ____________________?
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A. Barometer

B. thermometer

C. glass calorimeter

D. manometer

202. In how many forms do matter exists ?
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A. Four

B. Three

C. Five

D. Two

203. Splitting of spectral lines when atoms are subjected to strong electric filed is called_________________?
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A. Zeeman effect

B. Compton effect

C. Stark effect

D. Photoelectric effect

204. The processes of effusion and diffusion are best understand by________________?
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A. Daltons law

B. Avogadros law

C. Charles law

D. Grahams law
205. Bond will beionic when E.N difference of bonded atom is ____________________?
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A. Greater than 1.7

B. Equal to 1.7

C. Less than 1.7

D. No specificity exists

206. Wavelength of electron was verified by_________________?
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A. Davisson and Germer

B. Einstein

C. Moseley

D. Roentgen

207. Size of filter paper is selected according to the amount of__________________?
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A. Amount of solvent

B. amount of insoluble solute

C. solution

D. amount of soluble solute

208. _______________ can expel proteons from paraffins ?
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A. Positron

B. Electron

C. Neutron

D. None of above has such capability

209. When electron jump into orbit 1 then series obtained is___________________?
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A. Pfund

B. Lyman

C. Brackett

D. Paschen

210. 2nd orbit is ___________ away from nucleus of H-atom as compared to 1st orbit is ?
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A. 3-times

B. 6 times

C. 2-times

D. 4-times
211. ________________ is study about energy of a chemical system ?
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A. thermochemistry

B. thermodynamics

C. chemical kinetics

D. stoichiometry

212. on sp3 hybridization ________________?
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A. All p-orbitals are involved

B. One s and 3 p-orbitals are involved

C. four p-orbitals are involved

D. one p-orbital is involved

213. Spectrum is produced due to________________?
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A. Different intensities

B. Different colours

C. all have little contribution

D. Different wavelength
214. Coal is produced after a long time decay of_________________?
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A. all of the above

B. wood

C. animals

D. fossils

215. Bucky balls is an allotropic from of__________________?
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A. Carbon

B. Tin

C. Silica

D. Sulphur

216. Which of the following has strongest intermolecular forces of attraction ?
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A. Chlorine (Cl2)

B. Hydrogen (H2)

C. lodine (I2)

D. Methane (CH4)

217. Which of the following technique is simple and efficient to purify a substance____________________?
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A. Filtration

B. Crystallization

C. Sublimation

D. Solvent extraction
218. Total energy of a system is_________________?
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A. K.E + heat energy

B. P.E + mechanical energy

C. P.E + heat energy

D. P.E + K.E
219. Two fundamental ways to transfer energy are________________?
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A. pressure and volume

B. heat and work

C. heat and volume

D. pressure and temperature

220. Centrifugal forces are balanced in atom by__________________?
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A. Electrons

B. Repulsive force

C. Neutrons

D. Attractive forces