chemistry MCQs – Page 13

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 Review each marked answer and report any item that may be outdated or unclear.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
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

244. The maximum number of electron in a sub shell with ? = 3fs______________?
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A. 18

B. 6

C. 10

D. 14
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

246. The general formula of cycloalkene is __________________?
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A. CnH2n-1

B. CnH2n-2

C. CnH2n

D. CnH2n+2

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

248. Unit of heat in SI system is________________?
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A. Cal

B. GJ

C. J

D. KCaL

249. The solid which is left over the filter paper as a result of filtration_________________?
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A. crystals

B. residue

C. mud

D. Insoluble particles

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
251. Which type of bond is formed by overlap of p orbitals _______________?
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A. Pi

B. Sigma

C. Both

D. Neither

252. Positive rays are produced__________________?
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A. By burning of gas

B. By cooling of the gas

C. By the bombardment of cathode rays on gas molecules

D. From anode like cathode rays produced from cathode

253. Three quantum number have been derived from equation of____________________?
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A. Plancks

B. Schrodinger

C. Heisenberg

D. de-Broglie

254. 0.5 mole of nitrogen gas and 0.5 mole of carbon monoxide gas at STP have same_____________?
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A. Value of a

B. Mass

C. Atoms

D. Both B and C
255. Crude oil is blackish coloured liquid produced after the decay of organic matter present between_________________?
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A. rocks

B. mountains

C. sedimentary rocks

D. earth layer

256. 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_________________?
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A. Rhombohedral

B. Orthor hombic

C. ABCABC (Cubic)

D. ABAB (hexagonal)
257. The tip of funnel should touch the wall of the breaker in order to avoid____________________?
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A. splashing

B. Inconsistent flow of filtration

C. premature crystallization

D. all of above

258. Elements having high I.P values are____________________?
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A. Solids

B. Non metals

C. Liquids

D. Metals

259. Elements of group IA IIA are _________________?
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A. Electronegative

B. IA is electropositive while IIA is electronegative

C. Electropositive

D. Neutral

260. The relationship between energy of a photon of light and its frequency is given by________________?
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A. de-Broglie duel nature of matter

B. Bohrs model

C. Rutherfords atomic model

D. Plancks Quantum theory