chemistry MCQs – Page 14

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 Review each marked answer and report any item that may be outdated or unclear.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
261. Isomorphic substances have _______________?
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A. Same physical and different chemical properties

B. Different physical and chemical properties

C. Same physical and chemical properties

D. Different physical and same chemical properties

262. Estimation of amounts of different components in a sample is________________?
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A. Quantitative analysis

B. Physical chemistry

C. Qualitative analysis

D. Stochiometery

263. Which one has maximum number of unpaired electrons ?
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A. 7Y

B. 9Z

C. 13W

D. 6X

264. Measurement of the degree of polarity is___________________?
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A. Dipole moment

B. Electron affinity

C. Ionization energy

D. Ionic character

265. Boiling points of hydrocarbons increase with the increase in number of carbon atoms. It is mainly due to_________________?
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A. Less polarizability

B. More strength of H-bonding

C. More strength of London forces

D. All of the above

266. The number amino acid units for each turn of helix on average are____________________?
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A. 23

B. 27

C. 21

D. 25

267. Most of thermodynamic parameters are_________________?
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A. surrounding

B. system

C. phase

D. state functions
268. Pumping of water uphill is_______________?
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A. irreversible process

B. non-spontaneous process

C. spontaneous process

D. reversible process

269. Shaking two immiscible liquids increases_________________?
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A. Length of contact

B. Area of contact

C. all of above

D. Volume of contact

270. Which one shows high %age of the ionic character ?
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A. HBr

B. HF

C. H2O

D. HCI

271. Which one is not true about cathode rays ?
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A. Heat up the platinum foil

B. 9.1110-31 Kg

C. Cast shadow

D. Cannot ionize
272. Free neutron changes into proton with the emission of__________________?
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A. Neutrino

B. Electron

C. Both A & B

D. Meson

273. Molecular orbitals are filled according to _________________?
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A. Hunds rule

B. Paulis Exclusion principle

C. All these

D. Auf bau principle

274. Neutrons moving with an energy of 1.2 MeV are called_______________?
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A. Fast neutrons

B. Slow neutrons

C. Moderate neutrons

D. All are possible

275. In sp3 hybridization the expected geometry of molecules will be__________________?
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A. square planar

B. linear

C. tetrahedral

D. trigonal pyramidal

276. The density of water may be__________________?
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A. Equal to that of ice

B. Greater than that of ice

C. Less than that of ice

D. All are possible

277. Which is not a sublime material_______________?
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A. Iodine

B. Potash alum

C. Benzoic acid

D. Ammonium chloride

278. The correct electronic configuration of Cu is ___________________?
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A. [Ar]3d104s1

B. [Ar]4s2

C. [Ar]3d94s2

D. [Ar]4s1

279. Amorphous substances posses_________________?
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A. All of the above

B. No definite geometry

C. No definite heat of fusion

D. No sharp melting points
280. Pi bonds are produced by overlapping of__________________?
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A. Hybrid orbitals

B. Hybrid and un hybrid orbitals

C. atomic orbital and hybrid orbital

D. Un-hybrid orbitals