chemistry MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.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
181. The environment in which a system is studied is __________________?
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A. surrounding

B. State function

C. phase

D. state

182. Which of the solid does not contain covalent bond________________?
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A. Graphite

B. Diamond

C. Copper

D. Ice

183. What is the relative rate of effusion of CO and CO2 ?
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A. CO is 1.25 times faster than CO2

B. CO is 3.75 times faster than CO2

C. CO is 1.25 times faster than CO

D. Both diffuse at the same rate

184. The first organic compound was synthesized in laboratory by_________________?
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A. Wohler

B. Kolbe

C. Berzilius

D. Berthelot

185. If internal energy of the system is increased ____________________?
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A. Temperature of the ystem may rise

B. All

C. Change in state of the system is increased

D. Chemical reaction may take place

186. Which of the following will have highest value of electron affinity_________________?
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A. F

B. I

C. Br

D. Cl
187. The value of e/m ratio of electron is________________?
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A. 9.1095 x 10-31 C/kg

B. 1.7588 x 1020 C/kg

C. 1.7588 x 1011 C/kg

D. 6.02 x 1023 C/kg

188. Product of charge and distance is called__________________?
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A. Pressure

B. Dipole moment

C. Work

D. Bond length

189. If we provide very high amount of heat to a liquid its boiling point will__________________?
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A. there will be no boiling

B. increase

C. remains constant

D. decrease

190. Selection of filter paper depends on size of particles to be________________?
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A. dried

B. decanted

C. decolorized

D. filtered
191. nergy of atom in compound is___________________?
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A. Impossible to predict

B. Lesser than individual

C. Higher than individual

D. No change

192. At low temperature and pressure cracking can be done in presence of catalyst________________?
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A. Fe2O3

B. Al2O3 and SiO2

C. Al2O3

D. Fe2O3 and SiO2

193. Molecular orbital which have higher energy than atomic orbitals is called___________________?
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A. Hybrid orbital

B. Antibonding molecular orbital

C. Super atomic orbital

D. Bonding molecular orbital

194. A malleable solid is one which can be_________________?
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A. Melted easily

B. Converted into thin sheets

C. All of the above

D. Converted into wires

195. CuSO4 + Zn?ZnSO4+Cu is___________________?
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A. Spontaneous reaction

B. Endothermic

C. Exothermic

D. Non-spontaneous reaction

196. What is the simplest form of matter ?
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A. Gas

B. Semi solid

C. Liquid

D. Solid

197. A specie with maximum number of unpaired electrons ?
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A. F

B. HF

C. NH-2

D. H2O

198. Which of the following statements is true about plasma________________?
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A. It is a conductor of electricity

B. All of the above

C. It may be the first state of matter

D. It is not a phase transition

199. In order to mention the boiling point of water at 110C the external pressure should be ?
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A. Between 760 torr and 1200 torr

B. Between 200 torr and 760 torr

C. any value of pressure

D. 765 torr

200. Which one has the lowest density at room temperature ?
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A. N2

B. Ne

C. NH3

D. CO