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

B. thermometer

C. glass calorimeter

D. manometer

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

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

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)

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
221. Without suction pump filtration is __________________?
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A. Rapid process

B. Fast process

C. All are possible

D. Slow process
222. Which one of the following has highest volatility_________________?
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A. Diethyl ether

B. Ethyl alcohol

C. Ethylene glycol

D. Water

223. Crystalline solids can be identified easily from their ___________________?
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A. Colour

B. Transition temperature

C. Sharp melting point

D. Definite geometry

224. Liquid gets the shape of the container when it is poured into it. Which one of the following reasons justifies it ?
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A. Lieuid is highly compressible

B. Liquid do not have definite volume

C. Liquid molecules can slide over each other

D. Liquid do not have definite shape

225. Colour of fluorescene produced by cathode rays depends upon________________?
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A. Composition of glass

B. Pressure

C. Volume

D. Temperature

226. Force responsible to hold atoms together in a compound is called ________________?
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A. Interaction

B. All of above represent same entity

C. Bond

D. Attractive force

227. Table salt crystallizes with a______________________?
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A. Face centered cubic lattice

B. body centered cubic lattice

C. simple cubic lattice

D. othorhombic lattice

232. Ionization energy in a period generally ___________________?
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A. No change

B. Variable trend

C. Increases

D. Decreases

234. Orbitals of same energy produced after mixing of orbitals of different energy are called __________________?
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A. Zeeman orbitals

B. Hybrid orbitals

C. Generate orbitals

D. Degenerate orbitals
235. Propene can exhibit________________?
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A. cis-trans isomerism

B. geometric isomerism

C. both a & b

D. none of the above
237. Unit of dipole moment is_________________?
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A. Newton

B. Pascal

C. Poise

D. Debye
240. Crystallization does not involve_______________?
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A. cooling

B. vaporization

C. heating

D. sublimation
241. Which one is not state function ________________?
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A. Work

B. Enthalpy

C. Gibbs free energy

D. Internal energy

242. A reaction has values of ?H and ?S which are both positive. The reaction __________________?
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A. Has an increasing free energy

B. Is non-spontaneous

C. Is spontaneous

D. Spontaneity is temperature dependent

243. Which one is not the absolute term of the element _________________ ?
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A. Atomic size

B. Electro negativity

C. Electron affinity

D. Ionization energy

245. All the enthalpy changes are________________?
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A. May or may not be A or B

B. Positive

C. Negative

D. none

247. Atomic orbits having same energy are called________________?
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A. Half filled orbitals

B. Anti bonding molecular orbitals

C. Degenerate orbitals

D. Bonding molecular orbitals

250. Which one of the following does not show hydrogen bonding?
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A. Phenol

B. Water

C. Ethyl alcohol

D. Diethyl ether