chemistry MCQs – Page 20

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 Review each marked answer and report any item that may be outdated or unclear.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
381. Angle of deflection was studied by________________?
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A. Hitorff

B. Stoney

C. William Crookes

D. J.Perrin
382. The spreading of fragrance or scent in air is due to_______________?
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A. Low dsensity

B. Attraction with air

C. Effusion

D. Diffusion
383. Which one is a conductor but is not malleable ?
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A. Silver

B. Iron

C. Platinum

D. Graphite
384. The velocity of the photon____________________?
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A. Depends upon its frequency

B. Depends upon source

C. Is independent of wavelength

D. Equals to the square of amplitude

385. First organic compound synthesized in laboratory was _________________?
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A. ethyl alcohol

B. urea

C. methanol

D. tartaric acid

386. Energy required to remove electron from an atom______________?
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A. Electron affinity

B. Electronegativity

C. Ionization potential

D. Activation energy

387. 2-propanol and 1-propanol show the isomerism________________?
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A. position isomerism

B. geometric isomerism

C. functional group isomerism

D. metamerism

388. Splitting of spectral lines when atom is subjected to magnetic field is called _______________?
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A. Photo electric effect

B. Zeemans effect

C. Starks effect

D. Compton effect

389. In O2 each oxygen atom is hybridized_________________?
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A. sp

B. All

C. sp2

D. sp3

390. Linds method is employed for__________________?
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A. Expansion of gases

B. Compression of gases

C. Separation of gases

D. Liquefaction of gases
391. Vapour pressure of water at 100C is___________________?
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A. 1489 mm Hg

B. 355 mm Hg

C. 55 mm Hg

D. 760 mm Hg
392. The pressure during the molar heat of fusion is kept________________?
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A. one atmosphere

B. 2 atmosphere

C. 10 atmosphere

D. 0 atmosphere

393. The letters s p d and f are used to represent which quantum numbers________________?
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A. Azimuthal

B. Magnetic

C. Principal

D. Spin

394. Hydrogen effuses four times more rapidly than volume of an unknown gas molar mass of unknown gas should be_______________?
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A. 48 gmol-1

B. 64 gmol-1

C. 16 gmol-1

D. 32 gmol-1
395. The structure of ethyne is_________________?
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A. trigonal planar

B. trigonal

C. angular

D. linear
396. The magnetic quantum number (QN) has its values determined directly by the value of_______________?
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A. Principal (QN)

B. Azimuthal (QN)

C. Spin (QN)

D. Both A & B

397. An atom loses or gains electrons to__________________?
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A. all are accurate justifications

B. Gain stability

C. Form a bond

D. Complete its outermost shell

398. Geometry of molecule will be pyramidal if the outer post shell of the central atom has___________________?
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A. 1 bond pair 3 lone pair

B. 3 lone pair 1 bond pair

C. 3 bond pair one lone pair

D. 2 bond pair 2 lone pair

399. Gooch Crucibles are made up of________________?
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A. steel

B. plastic

C. porcelain

D. fibre

400. Energy released or absorbed when electrons are added in atom is_________________?
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A. Ionization potential

B. Activation energy

C. Electron affinity

D. Electronegativity