chemistry MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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
281. What is the abundant form of matter on earth ?
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A. Plasma

B. Solid

C. Liquid

D. Gas

282. Rate of reactions of most organic compounds are____________________?
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A. slow

B. very slow

C. no regular character present

D. very fast

283. Sintered crucible is made up of________________?
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A. fiber

B. porcetain

C. Plastic

D. glass
284. Liquid crystal is discovered by __________________?
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A. Fredrack Reinitzer

B. William Crooks

C. Bravis

D. J.J Thomson

285. In solvent extraction ether is used to separate products of organic synthesis from________________?
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A. iodine

B. water

C. gases

D. hydrochloric acid

286. When water freezes at 0C its density decreases due to_______________?
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A. Change of bond angles

B. Empty space present in the structure of ice

C. Change of bond length

D. Cubic structure of ice

287. Increase in atomic number is observed during_________________?
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A. Alpha emission

B. Beta emission

C. Both A & B

D. Radioactivity

288. When an atom absorbs energy the lines in the spectrum will appear which are_________________?
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A. Colourless

B. Hard to locate

C. Brighter

D. Darker
289. The use of CaCl2 and PCl5 in the process of crystallization is as a____________________?
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A. colouring agent

B. reducing agent

C. drying agent

D. oxidizing agent

290. Which of the following option is incorrect about gases ?
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A. All gases cannot be liquefied through Linds Method

B. PV / RT = n

C. All molecules behave independently

D. All molecules move with same speed
291. Which of the following technique is used for the separation of insoluble particles from liquids ?
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A. Chromatography

B. Solvent extraction

C. Crystallization

D. Filtration
292. In cyano group the carbon atom shows which kind of hybridization___________________?
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A. none of the above

B. sp

C. sp2

D. sp3

293. Atom cannot be divided into simple unitstheorized by________________?
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A. Schrodinger

B. Rutherford

C. Dalton

D. Bohr

294. Space around nucleus where finding probability of electrons is maximum is called ____________________?
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A. Orbital

B. Orbit is elliptical

C. subshell

D. Electron cloud

295. Electronic configuration of K is_________________?
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A. [He]2s1

B. [Ar]4s1

C. [Ar]4s2

D. [Kr]5s1

296. According to VESPR Model the geometry of molecule having 5 bond pair in outer most shell will be __________________?
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A. Triangular

B. Octahedral

C. Square planner

D. Trigonal bipyramidal
297. Sintered glass is a porous material used for ___________________?
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A. absorption

B. adsorption

C. sublimation

D. filtration
298. If a physical and chemical change takes place at a constant pressure then the heat change during the process is called__________________?
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A. Heat of transition

B. Heat of fusion

C. All of above

D. Enthalpy change
299. Planks theory says energy is emitted__________________?
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A. In continuous manner

B. In the form of heat

C. Discontinuous manner

D. Simultaneously

300. Steam causes more sever burn than the boiling water because it possesses _________________?
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A. Latent heat of fusion

B. Latent heat of vaporization

C. Latent heat of sublimation

D. All of the above