chemistry MCQs – Page 21

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 Review each marked answer and report any item that may be outdated or unclear.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
401. Which one of the following compounds shows intense knocking ?
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A. n-heptane

B. iso-heptane

C. iso-octane

D. n-pentane

402. When 6d orbital is complete the entering electron goes into_________________?
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A. 7d

B. 7p

C. 7f

D. 7s

403. Rutherford bombarded _________________ particles in discovery of nucleus?
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A. X-rays

B. Alpha-rays

C. Beta-rays

D. Gamma-rays

404. The introduction of Kelvin scale in thermodynamic is according to_______________?
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A. Charles law

B. Boyles law

C. Grahams law

D. Daltons law

405. The number of formula units in 29.25g of common salt_________________?
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A. 2 x NA

B. 6.022 x 1023

C. 3.01 x 1023

D. 4 x 6.022 x 1023

406. The solvent or mixture of solvents used for separation of compounds is called____________________?
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A. Stationary phase

B. Mobile phase

C. Dynamic phase

D. Static phase

407. Which has strongest bonding in the solid state ?
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A. Sodium Chloride (NaCI)

B. Chlorine (Cl2)

C. Xenon(Xe)

D. Hydrogen Chloride (HCI)

408. Critical temperature for different gases is different and depends upon______________?
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A. Size of molecule

B. Shape of molecule

C. All of the above

D. Intermolecular attractions

409. The geometry of ammonia is___________________?
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A. Tetrahedral

B. Trigonal bipyramidal

C. Trigonal Pyramidal

D. Square planner

410. The Lewis acids are__________________?
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A. No such acids exist

B. Electron deficient

C. Octet is complete

D. Electron rich

411. The boiling point increases down the zero group element due to_________________?
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A. London forces

B. Ion dipole forces

C. Dipole dipole forces

D. Hydrogen bonding

412. When electrons collide with heavy metals than ___________ are produced?
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A. Beta-rays

B. Alpha-rays

C. Gamma-rays

D. X-rays
413. When enthalpy of reactants is higher than product then reaction will be_________________?
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A. non-spontaneous

B. exothermic

C. spontaneous

D. endothermic

414. The quantity of heat required to convert one mole of liquid into its vapours at its boiling point is called molar heat of__________________?
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A. vaporization

B. sublimation

C. crystallization

D. evaporation

415. The number of fundamental particles in an atom of the lightest isotope carbon are_______________?
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A. 20

B. 12

C. 6

D. 18
416. Sommerfelds modification in Bohrs model is_______________?
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A. Orbit is elliptical

B. Orbit is longitudinal

C. Orbit is asymmetrical

D. Orbit is cylindrical

417. Atom with higher atomic number produces X-rays of__________________?
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A. All are possible

B. Larger wavelength

C. Shorter wavelength

D. X-ray not produced

418. Vapour pressure is not affected by_______________?
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A. temperature

B. intermolecular forces

C. atmospheric pressure

D. Surface area
419. The phenomenon in which a compound exists in two or more crystalline forms is called ________________?
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A. Isomorphism

B. Anisotropy

C. Polymorphism

D. Allotropy

420. A single atom or group of atoms which gives characteristic properties to a compound is called_________________?
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A. hydrocarbon

B. ion

C. radical

D. functional group